CustomAdapter 不显示 ArrayList 项目：ImageView
CustomAdapter is not displaying ArrayList Item: ImageView
在我的 CheckOutMemo.class 中，我可以将任何 title 和 content 设置为如图所示。
MainActivity.class 然后毫无问题地检索此标题和内容并显示自定义行。就像这张图：
标题 = Header
内容 = 正文
但问题是：当我拍照时 - 我不能在我的自定义行上显示它。 （默认情况下，我的 MainActivity 中的那只小狗就在那里）。
我不知道是什么问题。
我可以在 CheckOutMemo.class 的 contentView 中以位图形式预览捕获的图像。我可以成功地将它保存到我的外部存储中。但是 我无法 在我的 MainActivity 上显示它。
MAINACTIVITY.CLASS
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemLongClickListener, AdapterView.OnItemClickListener {
public ImageView view;
private String[] mPermission = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
private static final int REQUEST_CODE_PERMISSION = 5;
CustomAdapter customAdapter;
ListView listView;
Intent intent;
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customAdapter = new CustomAdapter();
listView = (ListView) findViewById(R.id.myListView);
listView.setAdapter(customAdapter);
listView.setOnItemLongClickListener(this);
listView.setOnItemClickListener(this);
view = (ImageView) this.findViewById(R.id.imageIcon);
if (ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[0])
!= MockPackageManager.PERMISSION_GRANTED ||
ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[1])
!= MockPackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
mPermission, REQUEST_CODE_PERMISSION);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Memo memo = customAdapter.getItem(position);
intent = new Intent(getApplicationContext(), CheckOutMemo.class);
intent.putExtra("header", memo.header);
intent.putExtra("bodyText", memo.bodyText);
intent.putExtra("position", position);
// launches edit request and saving existing item.
startActivityForResult(intent, CheckOutMemo.EDIT_REQUEST_CODE);
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Confirm Delete");
alertDialogBuilder.setMessage("Delete memo?");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
customAdapter.delete(position);
customAdapter.notifyDataSetChanged();
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
public void addNewNote(View view) {
Intent intent = new Intent(getApplicationContext(), CheckOutMemo.class);
//Adding new listItem to the ArrayList.
startActivityForResult(intent, CheckOutMemo.ADD_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {
return;
}
if (requestCode == CheckOutMemo.ADD_REQUEST_CODE) {
String header = data.getStringExtra("header");
String bodyText = data.getStringExtra("bodyText");
if (getIntent().hasExtra("byteArray")) {
Bitmap bitmap = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"), 0, getIntent().getByteArrayExtra("byteArray").length);
view.setImageBitmap(bitmap);
}
Memo memo = new Memo(header, bodyText, view);
customAdapter.add(memo);
customAdapter.notifyDataSetChanged();
}
if (requestCode == CheckOutMemo.EDIT_REQUEST_CODE) {
int position = data.getIntExtra("position", 0);
Memo memo = customAdapter.getItem(position);
memo.header = data.getStringExtra("header");
memo.bodyText = data.getStringExtra("bodyText");
customAdapter.notifyDataSetChanged();
}
}
}
CHECKOUTMEMO.CLASS
public class CheckOutMemo extends AppCompatActivity {
public static final int ADD_REQUEST_CODE = 1;
public static final int EDIT_REQUEST_CODE = 2;
public static final int REQUEST_IMAGE_CAPTURE = 1337;
public String fileName;
public Bitmap bitmap;
private int position;
EditText editableTitle;
EditText editableContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Intent intent = getIntent();
editableTitle = (EditText) findViewById(R.id.editHeader);
editableContent = (EditText) findViewById(R.id.editBodyText);
editableTitle.setText(intent.getStringExtra("header"));
editableContent.setText(intent.getStringExtra("bodyText"));
checkIfUserChangedOrWroteAnyText();
//Declaring keyword and default position.
position = intent.getIntExtra("position", 0);
}
public void capturePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
try {
loadImageFromFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void loadImageFromFile() throws IOException {
ImageView view = (ImageView)this.findViewById(R.id.primeImage);
view.setVisibility(View.VISIBLE);
int targetW = view.getWidth();
int targetH = view.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
view.setImageBitmap(bitmap);
}
public void createImageFromBitmap(){
if(bitmap!=null) {
Intent i = new Intent(this, MainActivity.class);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, bs);
i.putExtra("byteArray", bs.toByteArray());
startActivity(i);
} else {
Toast.makeText(CheckOutMemo.this, "Bitmap is null", Toast.LENGTH_SHORT).show();
}
}
public void onSaveClick(View view){
String editableContentString = editableContent.getText().toString();
String editableTitleString = editableTitle.getText().toString();
if(TextUtils.isEmpty(editableContentString) && TextUtils.isEmpty(editableTitleString)) {
finish();
Toast.makeText(CheckOutMemo.this, "No content to save, note discarded", Toast.LENGTH_SHORT).show();
}
else {
if ((TextUtils.isEmpty(editableTitleString))) {
editableTitleString.equals(editableContentString);
Intent intent = new Intent();
createImageFromBitmap();
intent.putExtra("header", editableContent.getText().toString());
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(Activity.RESULT_OK, intent);
finish();
} else {
Intent intent = new Intent();
createImageFromBitmap();
intent.putExtra("header", editableTitle.getText().toString());
intent.putExtra("bodyText", editableContent.getText().toString());
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(Activity.RESULT_OK, intent);
finish();
}
}
}
public void cancelButtonClickedAfterEdit() {
Button button = (Button) findViewById(R.id.bigCancelButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
openDialogFragment(v);
}
});
}
public File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
String folder_main = "DNote";
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString() + File.separator + folder_main;
File storageDir = new File(path);
if (!storageDir.exists()) {
storageDir.mkdir();
}
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
fileName = image.getAbsolutePath();
MediaScannerConnection.scanFile(getApplicationContext(), new String[]{image.getPath()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
@Override
public void onScanCompleted(String path, Uri uri) {
// Log.i(TAG, "Scanned " + path);
}
});
return image;
}
@Override
public void onBackPressed() {
openDialogFragment(null);
}
public void onCancelClick(View view){
finish();
}
}
CUSTOMADAPTER.CLASS
public class CustomAdapter extends BaseAdapter {
ArrayList<Memo> memos = new ArrayList<>();
public void add(Memo memo) {
this.memos.add(memo);
}
public void delete(int position) {
memos.remove(position);
}
@Override
public Memo getItem(int position) {
return memos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return memos.size();
}
class MyViewHolder {
public TextView header, bodyText;
public ImageView imageView;
public MyViewHolder(View view) {
header = (TextView) view.findViewById(R.id.header);
bodyText = (TextView) view.findViewById(R.id.bodyText);
imageView = (ImageView) view.findViewById(R.id.primeImage);
}
}
@Override
public View getView(final int position, View convertView, ViewGroup parent){
MyViewHolder viewHolder;
if(null == convertView){
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
convertView = inflater.inflate(R.layout.custom_row, parent, false);
viewHolder = new MyViewHolder(convertView);
viewHolder.header.setTag(position);
convertView.setTag(viewHolder);
}
else{
viewHolder = (MyViewHolder) convertView.getTag();
}
Memo memo = getItem(position);
viewHolder.header.setText(memo.header);
viewHolder.bodyText.setText(memo.bodyText);
CheckOutMemo checkOutMemo = new CheckOutMemo();;
if(checkOutMemo.bitmap!=null) {
viewHolder.imageView.setImageBitmap(checkOutMemo.bitmap);
}
return convertView;
}
}
MEMO.CLASS
public class Memo {
public String header, bodyText;
public ImageView imageView;
public Memo(String header, String bodyText, ImageView imageView){
this.header = header;
this.bodyText = bodyText;
this.imageView = imageView;
}
}
我每天都在为此工作 2 个多月。任何帮助将不胜感激！！
好的，这是获得您想要的东西的最小可行解决方案。我刚刚修复了它，以便将图像返回到您的主 activity。其余问题由您解决。唯一class我没碰过的是你的备忘录class。但话虽如此，我强烈建议您更新它以存储带有图像路径的字符串，而不是 ImageView。
但是如果你想在这里做的是你的文件编辑工作：
第一个 自定义适配器：
我已经更改了从备忘录中获取图像的行，以检查其图像视图中是否有可绘制的位图，并将该位图传输到该行的图像视图。无需在此处实例化 CheckoutMemo activity。
public class CustomAdapter extends BaseAdapter {
ArrayList<Memo> memos = new ArrayList<>();
public void add(Memo memo) {
this.memos.add(memo);
}
public void delete(int position) {
memos.remove(position);
}
@Override
public Memo getItem(int position) {
return memos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return memos.size();
}
class MyViewHolder {
public TextView header, bodyText;
public ImageView imageView;
public MyViewHolder(View view) {
header = (TextView) view.findViewById(R.id.header);
bodyText = (TextView) view.findViewById(R.id.bodyText);
imageView = (ImageView) view.findViewById(R.id.primeImage);
}
}
@Override
public View getView(final int position, View convertView, ViewGroup parent){
MyViewHolder viewHolder;
if(null == convertView){
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
convertView = inflater.inflate(R.layout.custom_row, parent, false);
viewHolder = new MyViewHolder(convertView);
viewHolder.header.setTag(position);
convertView.setTag(viewHolder);
}
else{
viewHolder = (MyViewHolder) convertView.getTag();
}
Memo memo = getItem(position);
viewHolder.header.setText(memo.header);
viewHolder.bodyText.setText(memo.bodyText);
if (memo.imageView.getDrawable() instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) memo.imageView.getDrawable();
viewHolder.imageView.setImageBitmap(bitmapDrawable.getBitmap());
}
return convertView;
}
}
下一个你的 CheckoutMemo:
我已经更改了您的 setResult 方法的工作方式。我还删除了方法 createImageFromBitmap。这是有问题的，也造成了混乱。那是个傻瓜。 createImageFromBitmap 方法正在创建另一个 MainActivity...让我有点困惑为什么没有调用 onActivityResult。它没有被调用，因为你正在创建另一个 activity =/
无论如何，在您使用结果创建的意图中，您会注意到我还将文件路径字符串添加到创建的图像中。这样 main activity 就可以用它来获取图像了！
public class CheckOutMemo extends AppCompatActivity {
public static final int ADD_REQUEST_CODE = 1;
public static final int EDIT_REQUEST_CODE = 2;
public static final int REQUEST_IMAGE_CAPTURE = 1337;
public String fileName;
public Bitmap bitmap;
private int position;
EditText editableTitle;
EditText editableContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Intent intent = getIntent();
editableTitle = (EditText) findViewById(R.id.editHeader);
editableContent = (EditText) findViewById(R.id.editBodyText);
editableTitle.setText(intent.getStringExtra("header"));
editableContent.setText(intent.getStringExtra("bodyText"));
//checkIfUserChangedOrWroteAnyText();
//Declaring keyword and default position.
position = intent.getIntExtra("position", 0);
}
public void capturePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
try {
loadImageFromFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void loadImageFromFile() throws IOException {
ImageView view = (ImageView)this.findViewById(R.id.primeImage);
view.setVisibility(View.VISIBLE);
int targetW = view.getWidth();
int targetH = view.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
view.setImageBitmap(bitmap);
}
public void onSaveClick(View view){
String editableContentString = editableContent.getText().toString();
String editableTitleString = editableTitle.getText().toString();
if(TextUtils.isEmpty(editableContentString) && TextUtils.isEmpty(editableTitleString)) {
finish();
Toast.makeText(CheckOutMemo.this, "No content to save, note discarded", Toast.LENGTH_SHORT).show();
}
else {
if ((TextUtils.isEmpty(editableTitleString))) {
editableTitleString.equals(editableContentString);
Intent intent = new Intent();
//createImageFromBitmap();
intent.putExtra("header", editableContent.getText().toString());
intent.putExtra("position", position);
intent.putExtra("photo", fileName);
//Sending userInput back to MainActivity.
setResult(AppCompatActivity.RESULT_OK, intent);
finish();
} else {
Intent intent = new Intent();
//createImageFromBitmap();
intent.putExtra("header", editableTitle.getText().toString());
intent.putExtra("bodyText", editableContent.getText().toString());
intent.putExtra("photo", fileName);
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(AppCompatActivity.RESULT_OK, intent);
finish();
}
}
}
public void cancelButtonClickedAfterEdit() {
Button button = (Button) findViewById(R.id.bigCancelButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
//openDialogFragment(v);
}
});
}
public File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
String folder_main = "DNote";
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString() + File.separator + folder_main;
File storageDir = new File(path);
if (!storageDir.exists()) {
storageDir.mkdir();
}
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
fileName = image.getAbsolutePath();
MediaScannerConnection.scanFile(getApplicationContext(), new String[]{image.getPath()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
@Override
public void onScanCompleted(String path, Uri uri) {
// Log.i(TAG, "Scanned " + path);
}
});
return image;
}
@Override
public void onBackPressed() {
//openDialogFragment(null);
}
public void onCancelClick(View view){
finish();
}
}
最后你的 MainActivity:
如果照片路径存在，则在 activity 结果中。然后我将它添加到备忘录对象的图像视图中，以便稍后由适配器 ImageView 检索。这可以升级一点，因此我上面的评论只是通过传递文件路径就不那么复杂了；）
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemLongClickListener,
AdapterView.OnItemClickListener {
public ImageView view;
private String[] mPermission = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
private static final int REQUEST_CODE_PERMISSION = 5;
CustomAdapter customAdapter;
ListView listView;
Intent intent;
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customAdapter = new CustomAdapter();
listView = (ListView) findViewById(R.id.myListView);
listView.setAdapter(customAdapter);
listView.setOnItemLongClickListener(this);
listView.setOnItemClickListener(this);
//view = (ImageView) this.findViewById(R.id.imageIcon);
if (ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[0])
!= MockPackageManager.PERMISSION_GRANTED ||
ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[1])
!= MockPackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
mPermission, REQUEST_CODE_PERMISSION);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Memo memo = customAdapter.getItem(position);
intent = new Intent(getApplicationContext(), CheckOutMemo.class);
intent.putExtra("header", memo.header);
intent.putExtra("bodyText", memo.bodyText);
intent.putExtra("position", position);
// launches edit request and saving existing item.
startActivityForResult(intent, CheckOutMemo.EDIT_REQUEST_CODE);
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Confirm Delete");
alertDialogBuilder.setMessage("Delete memo?");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
customAdapter.delete(position);
customAdapter.notifyDataSetChanged();
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
public void addNewNote(View view) {
Intent intent = new Intent(getApplicationContext(), CheckOutMemo.class);
//Adding new listItem to the ArrayList.
startActivityForResult(intent, CheckOutMemo.ADD_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {
return;
}
if (requestCode == CheckOutMemo.ADD_REQUEST_CODE) {
String header = data.getStringExtra("header");
String bodyText = data.getStringExtra("bodyText");
File photo = new File(data.getStringExtra("photo"));
ImageView view = new ImageView(this);
if (photo.exists()) {
Bitmap myBitmap = BitmapFactory.decodeFile(photo.getAbsolutePath());
view.setImageBitmap(myBitmap);
}
Memo memo = new Memo(header, bodyText, view);
customAdapter.add(memo);
customAdapter.notifyDataSetChanged();
}
if (requestCode == CheckOutMemo.EDIT_REQUEST_CODE) {
int position = data.getIntExtra("position", 0);
Memo memo = customAdapter.getItem(position);
memo.header = data.getStringExtra("header");
memo.bodyText = data.getStringExtra("bodyText");
File photo = new File(data.getStringExtra("photo"));
if (photo.exists()) {
Bitmap myBitmap = BitmapFactory.decodeFile(photo.getAbsolutePath());
memo.imageView.setImageBitmap(myBitmap);
}
customAdapter.notifyDataSetChanged();
}
}
}
总而言之，运行这个我现在可以在创建的笔记中看到图片了！
在此处保留您的项目。两个月是一个很好的承诺。你做得很好，继续努力。还有更多你可以在那里改进的东西！继续按摩，永不放弃。
你摇滚=)
如果需要，我可以为您提供我创建的用于测试的工作项目。
在我的 CheckOutMemo.class 中，我可以将任何 title 和 content 设置为如图所示。
MainActivity.class 然后毫无问题地检索此标题和内容并显示自定义行。就像这张图：
标题 = Header
内容 = 正文
但问题是：当我拍照时 - 我不能在我的自定义行上显示它。 （默认情况下，我的 MainActivity 中的那只小狗就在那里）。 我不知道是什么问题。
我可以在 CheckOutMemo.class 的 contentView 中以位图形式预览捕获的图像。我可以成功地将它保存到我的外部存储中。但是 我无法 在我的 MainActivity 上显示它。
MAINACTIVITY.CLASS
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemLongClickListener, AdapterView.OnItemClickListener {
public ImageView view;
private String[] mPermission = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
private static final int REQUEST_CODE_PERMISSION = 5;
CustomAdapter customAdapter;
ListView listView;
Intent intent;
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customAdapter = new CustomAdapter();
listView = (ListView) findViewById(R.id.myListView);
listView.setAdapter(customAdapter);
listView.setOnItemLongClickListener(this);
listView.setOnItemClickListener(this);
view = (ImageView) this.findViewById(R.id.imageIcon);
if (ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[0])
!= MockPackageManager.PERMISSION_GRANTED ||
ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[1])
!= MockPackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
mPermission, REQUEST_CODE_PERMISSION);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Memo memo = customAdapter.getItem(position);
intent = new Intent(getApplicationContext(), CheckOutMemo.class);
intent.putExtra("header", memo.header);
intent.putExtra("bodyText", memo.bodyText);
intent.putExtra("position", position);
// launches edit request and saving existing item.
startActivityForResult(intent, CheckOutMemo.EDIT_REQUEST_CODE);
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Confirm Delete");
alertDialogBuilder.setMessage("Delete memo?");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
customAdapter.delete(position);
customAdapter.notifyDataSetChanged();
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
public void addNewNote(View view) {
Intent intent = new Intent(getApplicationContext(), CheckOutMemo.class);
//Adding new listItem to the ArrayList.
startActivityForResult(intent, CheckOutMemo.ADD_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {
return;
}
if (requestCode == CheckOutMemo.ADD_REQUEST_CODE) {
String header = data.getStringExtra("header");
String bodyText = data.getStringExtra("bodyText");
if (getIntent().hasExtra("byteArray")) {
Bitmap bitmap = BitmapFactory.decodeByteArray(
getIntent().getByteArrayExtra("byteArray"), 0, getIntent().getByteArrayExtra("byteArray").length);
view.setImageBitmap(bitmap);
}
Memo memo = new Memo(header, bodyText, view);
customAdapter.add(memo);
customAdapter.notifyDataSetChanged();
}
if (requestCode == CheckOutMemo.EDIT_REQUEST_CODE) {
int position = data.getIntExtra("position", 0);
Memo memo = customAdapter.getItem(position);
memo.header = data.getStringExtra("header");
memo.bodyText = data.getStringExtra("bodyText");
customAdapter.notifyDataSetChanged();
}
}
}
CHECKOUTMEMO.CLASS
public class CheckOutMemo extends AppCompatActivity {
public static final int ADD_REQUEST_CODE = 1;
public static final int EDIT_REQUEST_CODE = 2;
public static final int REQUEST_IMAGE_CAPTURE = 1337;
public String fileName;
public Bitmap bitmap;
private int position;
EditText editableTitle;
EditText editableContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Intent intent = getIntent();
editableTitle = (EditText) findViewById(R.id.editHeader);
editableContent = (EditText) findViewById(R.id.editBodyText);
editableTitle.setText(intent.getStringExtra("header"));
editableContent.setText(intent.getStringExtra("bodyText"));
checkIfUserChangedOrWroteAnyText();
//Declaring keyword and default position.
position = intent.getIntExtra("position", 0);
}
public void capturePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
try {
loadImageFromFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void loadImageFromFile() throws IOException {
ImageView view = (ImageView)this.findViewById(R.id.primeImage);
view.setVisibility(View.VISIBLE);
int targetW = view.getWidth();
int targetH = view.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
view.setImageBitmap(bitmap);
}
public void createImageFromBitmap(){
if(bitmap!=null) {
Intent i = new Intent(this, MainActivity.class);
ByteArrayOutputStream bs = new ByteArrayOutputStream();
bitmap.compress(Bitmap.CompressFormat.JPEG, 20, bs);
i.putExtra("byteArray", bs.toByteArray());
startActivity(i);
} else {
Toast.makeText(CheckOutMemo.this, "Bitmap is null", Toast.LENGTH_SHORT).show();
}
}
public void onSaveClick(View view){
String editableContentString = editableContent.getText().toString();
String editableTitleString = editableTitle.getText().toString();
if(TextUtils.isEmpty(editableContentString) && TextUtils.isEmpty(editableTitleString)) {
finish();
Toast.makeText(CheckOutMemo.this, "No content to save, note discarded", Toast.LENGTH_SHORT).show();
}
else {
if ((TextUtils.isEmpty(editableTitleString))) {
editableTitleString.equals(editableContentString);
Intent intent = new Intent();
createImageFromBitmap();
intent.putExtra("header", editableContent.getText().toString());
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(Activity.RESULT_OK, intent);
finish();
} else {
Intent intent = new Intent();
createImageFromBitmap();
intent.putExtra("header", editableTitle.getText().toString());
intent.putExtra("bodyText", editableContent.getText().toString());
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(Activity.RESULT_OK, intent);
finish();
}
}
}
public void cancelButtonClickedAfterEdit() {
Button button = (Button) findViewById(R.id.bigCancelButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
openDialogFragment(v);
}
});
}
public File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
String folder_main = "DNote";
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString() + File.separator + folder_main;
File storageDir = new File(path);
if (!storageDir.exists()) {
storageDir.mkdir();
}
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
fileName = image.getAbsolutePath();
MediaScannerConnection.scanFile(getApplicationContext(), new String[]{image.getPath()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
@Override
public void onScanCompleted(String path, Uri uri) {
// Log.i(TAG, "Scanned " + path);
}
});
return image;
}
@Override
public void onBackPressed() {
openDialogFragment(null);
}
public void onCancelClick(View view){
finish();
}
}
CUSTOMADAPTER.CLASS
public class CustomAdapter extends BaseAdapter {
ArrayList<Memo> memos = new ArrayList<>();
public void add(Memo memo) {
this.memos.add(memo);
}
public void delete(int position) {
memos.remove(position);
}
@Override
public Memo getItem(int position) {
return memos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return memos.size();
}
class MyViewHolder {
public TextView header, bodyText;
public ImageView imageView;
public MyViewHolder(View view) {
header = (TextView) view.findViewById(R.id.header);
bodyText = (TextView) view.findViewById(R.id.bodyText);
imageView = (ImageView) view.findViewById(R.id.primeImage);
}
}
@Override
public View getView(final int position, View convertView, ViewGroup parent){
MyViewHolder viewHolder;
if(null == convertView){
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
convertView = inflater.inflate(R.layout.custom_row, parent, false);
viewHolder = new MyViewHolder(convertView);
viewHolder.header.setTag(position);
convertView.setTag(viewHolder);
}
else{
viewHolder = (MyViewHolder) convertView.getTag();
}
Memo memo = getItem(position);
viewHolder.header.setText(memo.header);
viewHolder.bodyText.setText(memo.bodyText);
CheckOutMemo checkOutMemo = new CheckOutMemo();;
if(checkOutMemo.bitmap!=null) {
viewHolder.imageView.setImageBitmap(checkOutMemo.bitmap);
}
return convertView;
}
}
MEMO.CLASS
public class Memo {
public String header, bodyText;
public ImageView imageView;
public Memo(String header, String bodyText, ImageView imageView){
this.header = header;
this.bodyText = bodyText;
this.imageView = imageView;
}
}
我每天都在为此工作 2 个多月。任何帮助将不胜感激！！
好的，这是获得您想要的东西的最小可行解决方案。我刚刚修复了它，以便将图像返回到您的主 activity。其余问题由您解决。唯一class我没碰过的是你的备忘录class。但话虽如此，我强烈建议您更新它以存储带有图像路径的字符串，而不是 ImageView。
但是如果你想在这里做的是你的文件编辑工作：
第一个 自定义适配器：
我已经更改了从备忘录中获取图像的行，以检查其图像视图中是否有可绘制的位图，并将该位图传输到该行的图像视图。无需在此处实例化 CheckoutMemo activity。
public class CustomAdapter extends BaseAdapter {
ArrayList<Memo> memos = new ArrayList<>();
public void add(Memo memo) {
this.memos.add(memo);
}
public void delete(int position) {
memos.remove(position);
}
@Override
public Memo getItem(int position) {
return memos.get(position);
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public int getCount() {
return memos.size();
}
class MyViewHolder {
public TextView header, bodyText;
public ImageView imageView;
public MyViewHolder(View view) {
header = (TextView) view.findViewById(R.id.header);
bodyText = (TextView) view.findViewById(R.id.bodyText);
imageView = (ImageView) view.findViewById(R.id.primeImage);
}
}
@Override
public View getView(final int position, View convertView, ViewGroup parent){
MyViewHolder viewHolder;
if(null == convertView){
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
convertView = inflater.inflate(R.layout.custom_row, parent, false);
viewHolder = new MyViewHolder(convertView);
viewHolder.header.setTag(position);
convertView.setTag(viewHolder);
}
else{
viewHolder = (MyViewHolder) convertView.getTag();
}
Memo memo = getItem(position);
viewHolder.header.setText(memo.header);
viewHolder.bodyText.setText(memo.bodyText);
if (memo.imageView.getDrawable() instanceof BitmapDrawable) {
BitmapDrawable bitmapDrawable = (BitmapDrawable) memo.imageView.getDrawable();
viewHolder.imageView.setImageBitmap(bitmapDrawable.getBitmap());
}
return convertView;
}
}
下一个你的 CheckoutMemo:
我已经更改了您的 setResult 方法的工作方式。我还删除了方法 createImageFromBitmap。这是有问题的，也造成了混乱。那是个傻瓜。 createImageFromBitmap 方法正在创建另一个 MainActivity...让我有点困惑为什么没有调用 onActivityResult。它没有被调用，因为你正在创建另一个 activity =/
无论如何，在您使用结果创建的意图中，您会注意到我还将文件路径字符串添加到创建的图像中。这样 main activity 就可以用它来获取图像了！
public class CheckOutMemo extends AppCompatActivity {
public static final int ADD_REQUEST_CODE = 1;
public static final int EDIT_REQUEST_CODE = 2;
public static final int REQUEST_IMAGE_CAPTURE = 1337;
public String fileName;
public Bitmap bitmap;
private int position;
EditText editableTitle;
EditText editableContent;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail);
Intent intent = getIntent();
editableTitle = (EditText) findViewById(R.id.editHeader);
editableContent = (EditText) findViewById(R.id.editBodyText);
editableTitle.setText(intent.getStringExtra("header"));
editableContent.setText(intent.getStringExtra("bodyText"));
//checkIfUserChangedOrWroteAnyText();
//Declaring keyword and default position.
position = intent.getIntExtra("position", 0);
}
public void capturePhoto(View view) {
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
// Ensure that there's a camera activity to handle the intent
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
// Create the File where the photo should go
File photoFile = null;
try {
photoFile = createImageFile();
} catch (IOException ex) {
// Error occurred while creating the File
}
// Continue only if the File was successfully created
if (photoFile != null) {
takePictureIntent.putExtra(MediaStore.EXTRA_OUTPUT,
Uri.fromFile(photoFile));
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
}
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data){
if (requestCode == REQUEST_IMAGE_CAPTURE && resultCode == RESULT_OK) {
try {
loadImageFromFile();
} catch (IOException e) {
e.printStackTrace();
}
}
}
public void loadImageFromFile() throws IOException {
ImageView view = (ImageView)this.findViewById(R.id.primeImage);
view.setVisibility(View.VISIBLE);
int targetW = view.getWidth();
int targetH = view.getHeight();
// Get the dimensions of the bitmap
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
bmOptions.inJustDecodeBounds = true;
BitmapFactory.decodeFile(fileName, bmOptions);
int photoW = bmOptions.outWidth;
int photoH = bmOptions.outHeight;
// Determine how much to scale down the image
int scaleFactor = Math.min(photoW/targetW, photoH/targetH);
// Decode the image file into a Bitmap sized to fill the View
bmOptions.inJustDecodeBounds = false;
bmOptions.inSampleSize = scaleFactor;
bitmap = BitmapFactory.decodeFile(fileName, bmOptions);
view.setImageBitmap(bitmap);
}
public void onSaveClick(View view){
String editableContentString = editableContent.getText().toString();
String editableTitleString = editableTitle.getText().toString();
if(TextUtils.isEmpty(editableContentString) && TextUtils.isEmpty(editableTitleString)) {
finish();
Toast.makeText(CheckOutMemo.this, "No content to save, note discarded", Toast.LENGTH_SHORT).show();
}
else {
if ((TextUtils.isEmpty(editableTitleString))) {
editableTitleString.equals(editableContentString);
Intent intent = new Intent();
//createImageFromBitmap();
intent.putExtra("header", editableContent.getText().toString());
intent.putExtra("position", position);
intent.putExtra("photo", fileName);
//Sending userInput back to MainActivity.
setResult(AppCompatActivity.RESULT_OK, intent);
finish();
} else {
Intent intent = new Intent();
//createImageFromBitmap();
intent.putExtra("header", editableTitle.getText().toString());
intent.putExtra("bodyText", editableContent.getText().toString());
intent.putExtra("photo", fileName);
intent.putExtra("position", position);
//Sending userInput back to MainActivity.
setResult(AppCompatActivity.RESULT_OK, intent);
finish();
}
}
}
public void cancelButtonClickedAfterEdit() {
Button button = (Button) findViewById(R.id.bigCancelButton);
button.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
//openDialogFragment(v);
}
});
}
public File createImageFile() throws IOException {
// Create an image file name
String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss").format(new Date());
String imageFileName = "JPEG_" + timeStamp + "_";
String folder_main = "DNote";
String path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES).toString() + File.separator + folder_main;
File storageDir = new File(path);
if (!storageDir.exists()) {
storageDir.mkdir();
}
File image = File.createTempFile(
imageFileName, /* prefix */
".jpg", /* suffix */
storageDir /* directory */
);
// Save a file: path for use with ACTION_VIEW intents
fileName = image.getAbsolutePath();
MediaScannerConnection.scanFile(getApplicationContext(), new String[]{image.getPath()}, null,
new MediaScannerConnection.OnScanCompletedListener() {
@Override
public void onScanCompleted(String path, Uri uri) {
// Log.i(TAG, "Scanned " + path);
}
});
return image;
}
@Override
public void onBackPressed() {
//openDialogFragment(null);
}
public void onCancelClick(View view){
finish();
}
}
最后你的 MainActivity:
如果照片路径存在，则在 activity 结果中。然后我将它添加到备忘录对象的图像视图中，以便稍后由适配器 ImageView 检索。这可以升级一点，因此我上面的评论只是通过传递文件路径就不那么复杂了；）
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemLongClickListener,
AdapterView.OnItemClickListener {
public ImageView view;
private String[] mPermission = {Manifest.permission.WRITE_EXTERNAL_STORAGE, Manifest.permission.CAMERA};
private static final int REQUEST_CODE_PERMISSION = 5;
CustomAdapter customAdapter;
ListView listView;
Intent intent;
final Context context = this;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
customAdapter = new CustomAdapter();
listView = (ListView) findViewById(R.id.myListView);
listView.setAdapter(customAdapter);
listView.setOnItemLongClickListener(this);
listView.setOnItemClickListener(this);
//view = (ImageView) this.findViewById(R.id.imageIcon);
if (ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[0])
!= MockPackageManager.PERMISSION_GRANTED ||
ActivityCompat.checkSelfPermission(MainActivity.this, mPermission[1])
!= MockPackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(MainActivity.this,
mPermission, REQUEST_CODE_PERMISSION);
}
}
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Memo memo = customAdapter.getItem(position);
intent = new Intent(getApplicationContext(), CheckOutMemo.class);
intent.putExtra("header", memo.header);
intent.putExtra("bodyText", memo.bodyText);
intent.putExtra("position", position);
// launches edit request and saving existing item.
startActivityForResult(intent, CheckOutMemo.EDIT_REQUEST_CODE);
}
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(context);
alertDialogBuilder.setTitle("Confirm Delete");
alertDialogBuilder.setMessage("Delete memo?");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
customAdapter.delete(position);
customAdapter.notifyDataSetChanged();
}
});
alertDialogBuilder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.cancel();
}
});
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
public void addNewNote(View view) {
Intent intent = new Intent(getApplicationContext(), CheckOutMemo.class);
//Adding new listItem to the ArrayList.
startActivityForResult(intent, CheckOutMemo.ADD_REQUEST_CODE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (resultCode != Activity.RESULT_OK) {
return;
}
if (requestCode == CheckOutMemo.ADD_REQUEST_CODE) {
String header = data.getStringExtra("header");
String bodyText = data.getStringExtra("bodyText");
File photo = new File(data.getStringExtra("photo"));
ImageView view = new ImageView(this);
if (photo.exists()) {
Bitmap myBitmap = BitmapFactory.decodeFile(photo.getAbsolutePath());
view.setImageBitmap(myBitmap);
}
Memo memo = new Memo(header, bodyText, view);
customAdapter.add(memo);
customAdapter.notifyDataSetChanged();
}
if (requestCode == CheckOutMemo.EDIT_REQUEST_CODE) {
int position = data.getIntExtra("position", 0);
Memo memo = customAdapter.getItem(position);
memo.header = data.getStringExtra("header");
memo.bodyText = data.getStringExtra("bodyText");
File photo = new File(data.getStringExtra("photo"));
if (photo.exists()) {
Bitmap myBitmap = BitmapFactory.decodeFile(photo.getAbsolutePath());
memo.imageView.setImageBitmap(myBitmap);
}
customAdapter.notifyDataSetChanged();
}
}
}
总而言之，运行这个我现在可以在创建的笔记中看到图片了！
在此处保留您的项目。两个月是一个很好的承诺。你做得很好，继续努力。还有更多你可以在那里改进的东西！继续按摩，永不放弃。
你摇滚=)
如果需要，我可以为您提供我创建的用于测试的工作项目。