尝试在 imageview 中显示位图适用于应用程序但不适用于小部件

问题描述

我已经从带有 glide 库的链接下载了一个图像，并尝试在小部件上显示它，所以首先在 mainActivity 中尝试它，它在那里工作正常。这是代码：

public class MainActivity extends AppCompatActivity {

String link = "";
String imageUrl = "";
ImageView imageView;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imageView = findViewById(R.id.testimage);

}

像这样验证写权限：

public Boolean verifyPermissions() {

    int permissionExternalMemory = ActivityCompat.checkSelfPermission(this,Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permissionExternalMemory != PackageManager.PERMISSION_GRANTED) {

        String[] STORAGE_PERMISSIONS = {Manifest.permission.WRITE_EXTERNAL_STORAGE};
        ActivityCompat.requestPermissions(this,STORAGE_PERMISSIONS,1);
        return false;
    }
    return true;
}

以位图形式下载带有滑动的图像：

void downloadImage(String imageLink) {

    Context context = getApplicationContext();

    if (!verifyPermissions()) {
        return;
    }

    Glide.with(context)
            .asBitmap()
            .load(imageLink)
            .into(new CustomTarget<Bitmap>() {
                @Override
                public void onResourceReady(@NonNull Bitmap resource,@Nullable Transition<? super Bitmap> transition) {

                    Toast.makeText(MainActivity.this,"Saving Image",Toast.LENGTH_SHORT).show();
                    try {
                        saveImage(resource,dir,fileName);
                    } catch (IOException e) {
                        e.printstacktrace();
                    }

                }

                @Override
                public void onLoadFailed(@Nullable Drawable errorDrawable) {
                    super.onLoadFailed(errorDrawable);
                    Toast.makeText(MainActivity.this,"Failed to Download image.",Toast.LENGTH_SHORT).show();
                }
            });
}

将图像保存到图片文件夹，然后在活动中将其显示为空图像视图：

private void saveImage(Bitmap image,File storageDir,String imageFileName) throws IOException {

    Context context = getApplicationContext();

    SharedPreferences setting = getSharedPreferences("PlaylistWidgetPreferences",MODE_PRIVATE);
    SharedPreferences.Editor prefEditor = setting.edit();

    ContentValues values = new ContentValues();
    values.put(MediaStore.Images.Media.TITLE,"any_picture_name");
    values.put(MediaStore.Images.Media.DESCRIPTION,"test Image taken");
    values.put(MediaStore.Images.Media.MIME_TYPE,"image/jpeg");
    Uri uri = getContentResolver().insert(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,values);

    prefEditor.putString("thumbnailPath",getFullPathFromContentUri(context,uri));
    prefEditor.apply();

Toast.makeText(getApplicationContext(),uri.toString(),Toast.LENGTH_SHORT).show();
    OutputStream outstream;
    try {
        outstream = getContentResolver().openOutputStream(uri);
        image.compress(Bitmap.CompressFormat.JPEG,100,outstream);
        outstream.close();
        Toast.makeText(getApplicationContext(),"Success",Toast.LENGTH_SHORT).show();
    } catch (IOException e) {
        e.printstacktrace();
        Toast.makeText(getApplicationContext(),e.getMessage(),Toast.LENGTH_SHORT).show();
    }


    imageView.setimageBitmap(getBitmapFromUri(uri));
}

我从json获取链接后调用downloadImage。

到这里一切都很好，但是在 Widget 上从 SharedPreferences 获取位图的 URI，然后尝试通过 setimageViewBitmap 方法将位图设置为 remoteViews，但没有用，然后尝试通过 setimageViewUri 通过获取图像的真实地址来设置它，然后一个 mediastore 提供但是仍然没有工作。它给了我这些错误 E/libEGL: Invalid file path for libcolorx-loader.so 和 E/OplusCustomizeRestrictionManager: sInstance is null,start a new sInstance

这是小部件代码：

public class Playlist extends appwidgetprovider {

public static String thumbnailPath;

@Override
public void onUpdate(Context context,AppWidgetManager appWidgetManager,int[] appWidgetIds) {

    Log.d("1","1In OnUpdate.");

    SharedPreferences settings = context.getSharedPreferences("PlaylistWidgetPreferences",Context.MODE_PRIVATE);
    thumbnailPath = settings.getString("thumbnailPath","Hi");

    Log.d("URI : ",thumbnailPath);

    RemoteViews remoteViews = new RemoteViews(context.getPackageName(),R.layout.playlist);

    //remoteViews.setimageViewBitmap(R.id.videoThumbnail,BitmapFactory.decodeFile(thumbnailPath));

    remoteViews.setimageViewUri(R.id.videoThumbnail,Uri.parse(thumbnailPath));

    for (int appWidgetId : appWidgetIds) {
        updateAppWidget(context,appWidgetManager,appWidgetId);
    }
}

我已为应用程序的清单文件添加了写入权限。活动和小部件上的图像视图都没有给出任何默认源文件。任何帮助将不胜感激，谢谢。

解决方法

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