如何在安卓 11中实现存储权限。有人能分享一个用java实现的例子吗

Question

Intent chooserIntent = null;
       try {
           StrictMode.VmPolicy.Builder builder = new StrictMode.VmPolicy.Builder();
           StrictMode.setVmPolicy(builder.build());
   
           List<Intent> intentList = new ArrayList<>();
           Intent pickIntent = new Intent(Intent.ACTION_PICK,
                   MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
           Intent takePhotoIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
           takePhotoIntent.putExtra("return-data", true);
           takePhotoIntent.putExtra(MediaStore.EXTRA_OUTPUT, Uri.fromFile(getTempFile(context)));
           intentList = addIntentsToList(context, intentList, pickIntent);
           intentList = addIntentsToList(context, intentList, takePhotoIntent);
   
           if (intentList.size() > 0) {
               chooserIntent = Intent.createChooser(intentList.remove(intentList.size() - 1),
                       "Select photo !");
               chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, intentList.toArray(new Parcelable[]{}));
           }
           return chooserIntent;
       }catch (Exception e){
           e.printStackTrace();
       }

在这里，我在将版本设置为30后获得了intent size 0，但在以前的版本中，它工作正常

Answer 1

添加权限

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

添加此行清单文件应用程序标记

android:requestLegacyExternalStorage="true"

在你的活动中考虑这些变量

private static final int REQUEST_EXTERNAL_STORAGE = 1;
private static String[] PERMISSIONS_STORAGE = {
        Manifest.permission.WRITE_EXTERNAL_STORAGE
};

在活动onCreateView方法中

int permission = ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.WRITE_EXTERNAL_STORAGE);

    if (permission != PackageManager.PERMISSION_GRANTED) {
        // We don't have permission so prompt the user
        ActivityCompat.requestPermissions(
                MainActivity.this,
                PERMISSIONS_STORAGE,
                REQUEST_EXTERNAL_STORAGE
        );
    }

    else {

       //write code for permission granted 
    }