如何在android 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();
}

在将版本设置为30后，我得到了intent大小0，但在以前的版本中，它运行良好。

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签

android:requestLegacyExternalStorage="true"

在你的活动中使用这些变量

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 
}