Android-我如何从片段中选择和显示图像？

Question

我一直在尝试选择并在我的片段上显示图像，但似乎不起作用。

我下面的代码开始并将我带到我的图库，但当我点击图片时，我的应用程序崩溃并给我一个错误：

 Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);

有错误：

java.lang.RuntimeException:将结果ResultInfo{who=null，request=131073，result=-1，data = Intent { dat = content://media/external/images/media/19394(has extras)} }传递到活动{ com . my company . e _ planner/com . my company . e _ planner }失败。my activity }:Java . lang . security异常:权限拒绝:从pid=29204、uid=10011读取com . Android . providers . media . media provider uri content://media/EXTERNAL/images/media/19394需要Android . Permission . read _ EXTERNAL _ STORAGE或grantUriPermission()

这是我的代码：

public class Venue1 extends Fragment {

private int PICK_IMAGE_REQUEST = 1;

public Venue1() {
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View V = inflater.inflate(R.layout.fragment_venue1, container, false);

    Intent intent = new Intent();
    intent.setType("image/*");
    intent.setAction(Intent.ACTION_GET_CONTENT);
    startActivityForResult(Intent.createChooser(intent, "Select Picture"), PICK_IMAGE_REQUEST);

    return V;
}

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

    if (requestCode == PICK_IMAGE_REQUEST && resultCode == Activity.RESULT_OK && data != null && data.getData() != null) {

        Uri uri = data.getData();

        try {
            Bitmap bitmap = MediaStore.Images.Media.getBitmap(getActivity().getContentResolver(), uri);
            // Log.d(TAG, String.valueOf(bitmap));

            ImageView imageView = (ImageView)getActivity().findViewById(R.id.imageView);
            imageView.setImageBitmap(bitmap);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
}

Answer 1

这个错误是不言自明的。您需要请求权限android.permission.READ_EXTERNAL_STORAGE。只需将其添加到清单文件中。

Answer 2

在清单文件中添加读取外部存储的权限

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>