Question

我想为我的应用授予存储权限。我的代码工作完美，直到棉花糖，只有牛轧糖的问题

以下方法总是在牛轧糖中返回false，即使是从设置手动授予的权限。

private boolean checkWriteExternalPermission() {

    String permission = "android.permission.WRITE_EXTERNAL_STORAGE";
    int res = getApplicationContext().checkCallingOrSelfPermission(
            permission);
    return (res == PackageManager.PERMISSION_GRANTED);
}

我将此用于Nougat并允许，但上述方法仍然返回false。

void storagePermission(){
    StorageManager sm = (StorageManager)getSystemService(Context.STORAGE_SERVICE);
    StorageVolume volume = sm.getPrimaryStorageVolume();
    Intent intent = volume.createAccessIntent(Environment.DIRECTORY_PICTURES);
    startActivityForResult(intent, 1);

}

请帮我解决这个问题。

Answer 1

你应该使用libs： https://github.com/hotchemi/PermissionsDispatcher

@RuntimePermissions
public class MainActivity extends AppCompatActivity {

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

  MainActivityPermissionsDispatcher.storagePermissionWithCheck(this);

}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
// NOTE: delegate the permission handling to generated method
MainActivityPermissionsDispatcher.onRequestPermissionsResult(this, requestCode, grantResults);
}


@NeedsPermission(Manifest.permission.WRITE_EXTERNAL_STORAGE)
void storagePermission(){
StorageManager sm =(StorageManager)getSystemService(Context.STORAGE_SERVICE);
StorageVolume volume = sm.getPrimaryStorageVolume();
Intent intent = volume.createAccessIntent(Environment.DIRECTORY_PICTURES);
startActivityForResult(intent, 1);

}

 @OnPermissionDenied(Manifest.permission.WRITE_EXTERNAL_STORAGE)
void showDeniedForCamera() {
  // don't allow code here
}

@OnNeverAskAgain(Manifest.permission.WRITE_EXTERNAL_STORAGE)
void showNeverAskForCamera() {
    // neverAskAgain code here
}
}

Answer 2

您应该添加以下代码：

public void onActivityResult(final int requestCode, int resultCode, final Intent data){
        if(requestCode==1) {
            switch (resultCode) {
                case Activity.RESULT_OK:
                    getContentResolver().takePersistableUriPermission(data.getData(),
                            Intent.FLAG_GRANT_READ_URI_PERMISSION | Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
                    break;
            }
        }
    }

存储权限不适用于Nougat

2 个答案: