Android 空白网格项

Question

我正在开发一个在 GridView 中显示 WhatsApp 状态图像的应用程序。启动应用程序时，它可以正确显示图像，但会显示一些空白的网格项。由于目录中的视频文件，我知道这个空白的 griditem，但我不知道如何将图像文件与视频分开。我使用位图在网格上显示图像。所以它显示空白 gridview。我只需要 gridview 上的图像。

这是我的 MainActivity

public class MainActivity extends AppCompatActivity {
private String[] FilePathStrings;
private String[] FileNameStrings;
private File[] listFile;
GridView grid;
GridViewAdapter adapter;
File file;
String extension = ".jpg";
String TAG;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
        // Locate the image folder in your SD Card
        file = new File("/storage/emulated/0/WhatsApp/Media/.Statuses/");


    if (file.isDirectory()) {
        listFile = file.listFiles();

        // Create a String array for FilePathStrings
        FilePathStrings = new String[listFile.length];
        // Create a String array for FileNameStrings
        FileNameStrings = new String[listFile.length];


        for (int i = 0; i < listFile.length; i++) {
            if(listFile[i].getName().endsWith(extension)) {
                // Get the path of the image file
                FilePathStrings[i] = listFile[i].getAbsolutePath();
                // Get the name image file
                FileNameStrings[i] = listFile[i].getName();
            }
        }

    }

    // Locate the GridView in gridview_main.xml
    grid = (GridView) findViewById(R.id.gridview);
    grid.setColumnWidth(200);
    grid.setHorizontalSpacing(10);
    grid.setVerticalSpacing(10);
    grid.setNumColumns(2);
    grid.setStretchMode(GridView.STRETCH_SPACING_UNIFORM);
    // Pass String arrays to LazyAdapter Class
    adapter = new GridViewAdapter(this,FilePathStrings, FileNameStrings);
    // Set the LazyAdapter to the GridView
    grid.setAdapter(adapter);

这是我的 GridViewAdapter

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class GridViewAdapter extends BaseAdapter{
private Activity activity;
private String[] filepath;
private String[] filename;

private static LayoutInflater inflater = null;

public GridViewAdapter(Activity a, String[] fpath, String[] fname) {
    activity = a;
    filepath = fpath;
    filename = fname;
    inflater = (LayoutInflater) activity
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);

}

public int getCount() {
    return filepath.length;

}

public Object getItem(int position) {
    return position;
}

public long getItemId(int position) {
    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    View vi = convertView;
    if (convertView == null)
        vi = inflater.inflate(R.layout.gridview_item, null);
    // Locate the TextView in gridview_item.xml
    TextView text = (TextView) vi.findViewById(R.id.text);
    // Locate the ImageView in gridview_item.xml
    ImageView image = (ImageView) vi.findViewById(R.id.image);

    // Set file name to the TextView followed by the position
    text.setText(filename[position]);

    // Decode the filepath with BitmapFactory followed by the position
    Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);

    // Set the decoded bitmap into ImageView
    image.setImageBitmap(bmp);
    return vi;
}

}

Answer 1

我已经通过调试检查了你的代码，它工作正常，但你能展示你的 GridViewAdapter 吗？

Answer 2

Note 我已经使用 recyclerview and RecyclerView adapter.

实现了这个

无需在单独的项目位置插入视频文件。您的 ItemHolder 应该有两个 ImageViews。一个用于项目，另一个用于 Video Icon。最初 Video Icon ImageView 可见度为 Gone or Invisible。在适配器中绑定数据时只需检查文件的路径。如果文件路径以视频扩展名结尾，则 Video Icon ImageView 可见性应更改为可见。我在这里添加 XML and item Holder's code。 XML Recyleriew 项目的代码

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/cv_status_item"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="@color/colorWhite">

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <com.github.siyamed.shapeimageview.RoundedImageView
        android:id="@+id/iv_status"
        android:layout_width="match_parent"
        android:layout_height="90dp"
        app:siRadius="6dp"
        app:siBorderColor="#dfdfdf"
        app:siBorderWidth="1dp"
        app:siSquare="true"

        />

    <ImageView
        android:id="@+id/iv_play_icon"
        android:layout_width="40dp"
        android:layout_height="40dp"
        android:layout_centerInParent="true"
        android:contentDescription="@null"
        android:visibility="gone"
        android:background="@drawable/toolbar_transparent"
        app:srcCompat="@drawable/float_video_play" />

    <android.support.v7.widget.AppCompatCheckBox
        android:id="@+id/cb_selection"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="gone" />
</RelativeLayout>
</RelativeLayout>

ItemHolder 到 BindData

的代码

 public void bindData(StatusObject statusObject, int position, int size, boolean selectionMode) {
    super.bindData(statusObject, position, size);
    this.selectionMode = selectionMode;
    if (statusObject.getPath().endsWith(".mp4")) {
        ivPlayIcon.setVisibility(View.VISIBLE);
    }
    else if (statusObject.getPath().endsWith(".gif")){
        ivPlayIcon.setVisibility(View.VISIBLE);
    }
    else ivPlayIcon.setVisibility(View.GONE);
    if (selectionMode)
        cbSelection.setVisibility(View.VISIBLE);
    else cbSelection.setVisibility(View.GONE);
    cbSelection.setChecked(statusObject.isSelected());
    cbSelection.setClickable(false);
    //        ivStatus.setClipToOutline(true);
    Glide.with(itemView)
            .asBitmap()
            .load(Uri.fromFile(new File(statusObject.getPath())))
            .into(ivStatus);
}

Answer 3

如果你不想播放视频，那么你可以显示视频缩略图如下，

 Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(videofile.getAbsolutePath(), MediaStore.Video.Thumbnails.MICRO_KIND)

Answer 4

尝试将 listFile = file.listFiles(); 更改为

listFile = file.listFiles(new FileFilter() {
    @Override
    public boolean accept(File file) {
        return file.getName().toLowerCase().endsWith(extension);
    }
});

并在 for 循环中，删除 if 条件。希望对您有所帮助！

Android 空白网格项

Android Blank Grid Items

android

gridview