Question

我正在开发一个Android应用程序，它在一个活动中从库中选择一个图像并将其显示在另一个活动中。但是当我尝试删除所选图像时它不会删除。我在两个活动之间传递它的uri。非常感谢提前!!!!

这是我的代码：

ACTIVITY HOMESCREEN

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     super.onActivityResult(requestCode, resultCode, data);

     if (requestCode == PICK_IMAGE_REQUEST && resultCode == RESULT_OK && data != null && data.getData() != null) {
          Uri uri = data.getData();
          Intent i = new Intent(this, Imageviewer.class);       
          i.putExtra("imgpath", uri.toString());
          startActivity(i);
     }
}

IMAGEVIEWER ACTIVITY：

Uri imageUri;
imageUri = Uri.parse(intent.getStringExtra("imgpath"));
File fdelete = new File(imageUri.toString());

    if (fdelete.exists()) {
         if (fdelete.delete()) {
               System.out.println("file Deleted :" );
         } else {
               System.out.println("file not Deleted :");
         }
    }

Answer 1

首先，您必须采用真实的图像路径：

//getting real path from uri
private String getFilePath(Uri uri) {
    String[] projection = {MediaStore.Images.Media.DATA};

    Cursor cursor = getContentResolver().query(uri, projection, null, null, null);
    if (cursor != null) {
        cursor.moveToFirst();

        int columnIndex = cursor.getColumnIndex(projection[0]);
        String picturePath = cursor.getString(columnIndex); // returns null
        cursor.close();
        return picturePath;
    }
    return null;
}

然后您可以删除此文件，如下所示：

Uri imageUri;
imageUri = Uri.parse(intent.getStringExtra("imgpath"));
File fdelete = new File(getFilePath(imageUri));

if (fdelete.exists()) {
     if (fdelete.delete()) {
           System.out.println("file Deleted :" );
     } else {
           System.out.println("file not Deleted :");
     }
}

Answer 2

在您的情况下尝试:(在第二个FinalRow = ActiveSheet.Cells(Rows.Count, "A").End(xlUp).Row LastColumn = Cells(1, Columns.Count).End(xlToLeft).Column ActiveSheet.ListObjects.Add(xlSrcRange, Range(Cells(1, 1), Cells(FinalRow, LastColumn)), , xlYes).Name = "Data"）Activity。

ImageViewerActivity

您也可以逐行调试代码，查看并检查Intent intent = getIntent(); String receivedPath = intent.getExtras().getString("imgpath"); File fdelete = new File(receivedPath); if (fdelete.exists()) { if (fdelete.delete()) { System.out.println("file Deleted :" ); } else { System.out.println("file not Deleted :"); } }是否正确无误！

如何在知道URI的情况下从android中删除图像？

2 个答案: