如何以编程方式从 Android 设备中删除图像？

Question

我正在创建一个应用程序，允许用户从图库中选择图像并将其存储在我的数据库中。 我成功地做到了。

现在我也希望从手机存储中删除所选图像。 那我该怎么做呢？

我什至可能想稍后在用户库中恢复它。

这就是我从图库中获取图像的方法。

@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) 
{
    switch (requestCode)
    {
        case 42:
            if (resultCode == RESULT_OK)
            {
                Uri uri = data.getData();
                InputStream inputStream = null;
                try
                {
                    inputStream = getBaseContext().getContentResolver().openInputStream(uri);
                    Bitmap bm = BitmapFactory.decodeStream(inputStream);
                    int maxHeight = 1920;
                    int maxWidth = 1920;
                    float scale = Math.min(((float) maxHeight / bm.getWidth()), ((float) maxWidth / bm.getHeight()));
                    Matrix matrix = new Matrix();
                    matrix.postScale(scale, scale);
                    Bitmap bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
                    saveImageToInternalStorage(bitmap, getFileName(uri));
                    bm.recycle();
                    bitmap.recycle();
                    finishActivity(42);
                }
                catch (FileNotFoundException e)
                {
                    e.printStackTrace();
                }
            }
    }
}

这是我得到的 Uri 路径

content://com.android.providers.media.documents/document/image%3A5857

我的 onActivityResult 看起来像这样：

 @Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data)
{
    switch (requestCode)
    {
        case 42:
            if (resultCode == RESULT_OK)
            {
                Uri uri = data.getData();
                InputStream inputStream = null;
                try
                {
                    inputStream = getBaseContext().getContentResolver().openInputStream(uri);
                    Bitmap bm = BitmapFactory.decodeStream(inputStream);
                    int maxHeight = 1920;
                    int maxWidth = 1920;
                    float scale = Math.min(((float) maxHeight / bm.getWidth()), ((float) maxWidth / bm.getHeight()));
                    Matrix matrix = new Matrix();
                    matrix.postScale(scale, scale);
                    Bitmap bitmap = Bitmap.createBitmap(bm, 0, 0, bm.getWidth(), bm.getHeight(), matrix, true);
                    saveImageToInternalStorage(bitmap, getFileName(uri));

                    bm.recycle();
                    bitmap.recycle();
                    finishActivity(42);
                }
                catch (FileNotFoundException e)
                {
                    e.printStackTrace();
                }
            }
    }
}

Answer 1

您是否也在问同样的问题Delete image file from device programmatically 也许您可以从那里获得解决方案。

Answer 2

试试这个

public static boolean delete(final Context context, final File file) {
      final String where = MediaStore.MediaColumns.DATA + "=?";
       final String[] selectionArgs = new String[] {
            file.getAbsolutePath()
     };
   final ContentResolver contentResolver = context.getContentResolver();
   final Uri filesUri = MediaStore.Files.getContentUri("external");
   contentResolver.delete(filesUri, where, selectionArgs);

if (file.exists()) {

    contentResolver.delete(filesUri, where, selectionArgs);
}
return !file.exists();

}