如何为 Android 中的列表设置缩略图

Question

下面是文件 browser.It 的代码，可以很好地浏览设备上的文件和文件夹。我想在 image.How 的名称旁边显示图像缩略图，我可以实现吗？如果有人可以帮助修改此代码以添加图像缩略图。谢谢

public class MainActivity extends ListActivity {

private List<String> item = null;
private List<String> path = null;

private String root;
private TextView myPath;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    myPath = (TextView)findViewById(R.id.path);

    root = Environment.getExternalStorageDirectory().getPath();

    getDir(root);
}

private void getDir(String dirPath)
{
 myPath.setText("Location: " + dirPath);
 item = new ArrayList<String>();
 path = new ArrayList<String>();
 File f = new File(dirPath);
 File[] files = f.listFiles();

 if(!dirPath.equals(root))
 {
  item.add(root);
  path.add(root);
  item.add("../");
  path.add(f.getParent()); 
 }

 for(int i=0; i < files.length; i++)
 {
  File file = files[i];

  if(!file.isHidden() && file.canRead()){
   path.add(file.getPath());
      if(file.isDirectory()){
       item.add(file.getName() + "/");
      }else{
       item.add(file.getName());
      }
  } 
 }

 ArrayAdapter<String> fileList =
   new ArrayAdapter<String>(this, R.layout.row, item);
 setListAdapter(fileList); 
}

//带ListView的主布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" 
android:orientation="vertical">

<TextView
    android:id="@+id/path"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" />
<ListView
    android:id="@android:id/list"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    />
<TextView
    android:id="@android:id/empty"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="No Data"
    />

Answer 1

试试这个，

按如下方式为单个列表视图行创建布局，

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout  
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">

<ImageView
    android:id="@+id/image"
    android:layout_width="180dp"
    android:layout_height="180dp"/>

<TextView
    android:id="@+id/textview"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />

</LinearLayout >

将所需的图标放入可绘制文件夹并定义 class 以从 BaseAdapter

扩展

public class ListAdapter extends BaseAdapter{

private Context context;
private ArrayList<MyModel> data;

public AllListAdapter(Context con, ArrayList<String> dt) {
 this.context = con;
 this.data = dt;
}


 // other overriden methods


@Override
public View getView(int position, View convertView, ViewGroup parent) {
 // TODO Auto-generated method stub
 View row = convertView;

 TextView name;
 ImageView image;


if (row == null) 
{
    LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    row = inflater.inflate(R.layout.layout_for_single_list_row, null);

    name = (TextView) row.findViewById(R.id.textview);
    image = (ImageView) row.findViewById(R.id.image);
} 
else 
{
    name = (TextView) row.findViewById(R.id.textview);
    image = (ImageView) row.findViewById(R.id.image);
}

name.setText(data.get(position).getName());
image.setBackgroundDrawable(this.context.getResources().getDrawable(<your icon>))

return row;
 }  
 }

设置数据到列表

    ListAdapter allListadapter = new ListAdapter(this,item);
    your_list.setAdapter(allListadapter);

如何为 Android 中的列表设置缩略图

How to set thumbnails for the list in Android

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