Question

我正在做一个我需要打开一个图库并选择图片的应用程序，但是当我返回Activity时，项目的Cursor返回null。

在这里我打开画廊：

private static final int SELECT_PICTURE = 1;

    private void abrirGaleria(){
        Intent intent = new Intent();
        intent.setType("image/*");
        intent.setAction(Intent.ACTION_GET_CONTENT);
        startActivityForResult(Intent.createChooser(intent,"Select a pic"), SELECT_PICTURE);
    }

在这里我尝试得到结果：

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

        if(resultCode == ((Activity)ctx).RESULT_OK){
            Uri selectedImageURI = data.getData();
            File filePath = new File(getRealPathFromURI(selectedImageURI));

            compartilharAFoto(filePath.getPath());
        }
    }

private String getRealPathFromURI(Uri contentURI) {
        Cursor cursor = ((Activity)ctx).getContentResolver().query(contentURI, null, null, null, null);
        if (cursor == null) { // Source is Dropbox or other similar local file path
            return contentURI.getPath();
        } else {
            //cursor.moveToFirst();
            int idx = cursor.getColumnIndex(MediaStore.Images.ImageColumns.DATA);
            return cursor.getString(0);//idx);
        }
    }

和错误：

java.lang.RuntimeException: Failure delivering result ResultInfo{who=null, request=131073, result=-1, data=Intent { dat=content://com.android.providers.media.documents/document/image:1633 flg=0x1 }} to activity {br.com.blacktoad.q48h2/br.com.blacktoad.q48h2.MainActivity}: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1

出现的另一个错误说明：

Caused by: android.database.CursorIndexOutOfBoundsException: Index -1 requested, with a size of 1

Answer 1

您的查询没有您尝试访问的列。替换：

Cursor cursor = ((Activity)ctx).getContentResolver()
.query(contentURI, null, null, null, null);

使用：

Cursor cursor =  ((Activity)ctx).getContentResolver()
.query(contentURI, new String[]{MediaStore.Images.Media.DATA}, null, null, null);

并按如下方式更新此行：

 int idx = cursor.getColumnIndex(MediaStore.Images.Media.DATA);

并取消注释：

  cursor.moveToFirst();

调用图库后，光标返回null结果

1 个答案: