我试图上传照片从画廊到我的应用程序与位图，在我的模拟器（api 22）它的工作，但由于某种原因，在我的手机（api 23）它不工作的图片不会显示只是一个空页。这是我的密码，如果有关系的话：

public class Photoactivity extends Activity {
private static final int SELECTED_PICTURE=1;
ImageView iv;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_photoactivity);
    iv=(ImageView)findViewById(R.id.ImgView);
}
public void btnClick(View v){
        Intent i = new Intent(Intent.ACTION_PICK, android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
        startActivityForResult(i, SELECTED_PICTURE);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    // TODO Auto-generated method stub
    super.onActivityResult(requestCode, resultCode, data);
    switch (requestCode) {
        case SELECTED_PICTURE:
            if(resultCode==RESULT_OK){
                Uri selectedImage = data.getData();
                String[] filePathColumn = { MediaStore.Images.Media.DATA };
                Cursor cursor = getContentResolver().query(selectedImage,filePathColumn, null, null, null);
                cursor.moveToFirst();
                int columnIndex = cursor.getColumnIndex(filePathColumn[0]);
                String picturePath = cursor.getString(columnIndex);
                cursor.close();
                ImageView imageView = (ImageView) findViewById(R.id.ImgView);
                imageView.setImageBitmap(BitmapFactory.decodeFile(picturePath));
            }
            break;
        default:
            break;
    }
}

}