Android权限被拒绝-FutureTask应用崩溃

Question

I've got an app that needs to ask for permission to read contacts from an Android device. I'm aware of that I need to check for permission...

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) {
     requestPermissions(new String[]{READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS);
} else {
     loadContacts();
}

My problem is that if the user denies access my app is crashing

FATAL EXCEPTION: AsyncTask #2
Process: xxxxxxxxx, PID: 10376
java.lang.RuntimeException: An error occurred while executing doInBackground()
      at android.os.AsyncTask$3.done(AsyncTask.java:309)
      at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
      at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
      at java.util.concurrent.FutureTask.run(FutureTask.java:242)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
      at java.lang.Thread.run(Thread.java:818)
      Caused by: java.lang.SecurityException: Permission Denial: opening provider com.android.providers.contacts.ContactsProvider2 from ProcessRecord{3ad4917 10376:xxxxxxxxx/u0a196} (pid=10376, uid=10196) requires android.permission.READ_CONTACTS or android.permission.WRITE_CONTACTS
      at android.os.Parcel.readException(Parcel.java:1620)
      at android.os.Parcel.readException(Parcel.java:1573)
      at android.app.ActivityManagerProxy.getContentProvider(ActivityManagerNative.java:4241)
      at android.app.ActivityThread.acquireProvider(ActivityThread.java:6392)
      at android.app.ContextImpl$ApplicationContentResolver.acquireUnstableProvider(ContextImpl.java:2321)
      at android.content.ContentResolver.acquireUnstableProvider(ContentResolver.java:1521)
      at android.content.ContentResolver.query(ContentResolver.java:486)
      at android.content.CursorLoader.loadInBackground(CursorLoader.java:64)
      at android.content.CursorLoader.loadInBackground(CursorLoader.java:42)
      at android.content.AsyncTaskLoader.onLoadInBackground(AsyncTaskLoader.java:312)
      at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:69)
      at android.content.AsyncTaskLoader$LoadTask.doInBackground(AsyncTaskLoader.java:57)
      at android.os.AsyncTask$2.call(AsyncTask.java:295)
      at java.util.concurrent.FutureTask.run(FutureTask.java:237)
      at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) 
      at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) 
      at java.lang.Thread.run(Thread.java:818) 

I understand that I don't have access , but surely the app shouldn't crash, it should just mean I can't read the contacts? It seems to be talking about a FutureTask which I'm not sure what this is? I've tried commenting out all the code that actually does the contact access and it still crashes before it gets anywhere near trying to read the contacts. I just want to handle this situation gracefully and I don't appear to be getting the chance?

The Manifest has the permission set

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

Also if I go into Application Manager and change the settings for the app so that the app does have access to contacts the app runs fine, and I've still not accessed the contacts yet, this is purely on start up

Answer 1

Please use following code to check permissions

call isStoragePermissionGranted1() first in your oncreate method after that the loadContacts()

Like

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if(isStoragePermissionGranted1())
      {
             loadContacts();
      }
}


  public boolean isStoragePermissionGranted1() {
    if (Build.VERSION.SDK_INT >= 23) {
        if (checkSelfPermission(Manifest.permission.READ_CONTACTS)
                == PackageManager.PERMISSION_GRANTED && checkSelfPermission(Manifest.permission.WRITE_CONTACTS)
                == PackageManager.PERMISSION_GRANTED) {
            Log.v("TAG", "Permission is granted");
            return true;
        } else {
            Log.v("TAG", "Permission is revoked");
            ActivityCompat.requestPermissions(WelcomeActivity.this, new String[]{android.Manifest.permission.READ_CONTACTS, Manifest.permission.WRITE_CONTACTS}, 1);
            return false;
        }
    } else { //permission is automatically granted on sdk<23 upon installation
        Log.v("TAG", "Permission is granted");
        return true;
    }
}

To check permissions is denied or granted we can use

@Override
    public void onRequestPermissionsResult(int requestCode,
    String permissions[], int[] grantResults) {
        switch (requestCode) {
         case MY_PERMISSIONS_REQUEST_READ_CONTACTS: {
        if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {

            // permission was granted, yay! do the
            //  task you need to do.

        } else {

            // permission denied, boo! Disable the
            // functionality that depends on this permission.
        }
        return;
    }

    // other 'switch' lines to check for other
    // permissions this app might request
}

}

Hope this will help

Answer 2

I suggest you use the ActivityCompat , which supports it better

    if (ContextCompat.checkSelfPermission(this,Manifest.permission.WRITE_CONTACTS) != PermissionChecker.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(new String[]{Manifest.permission.WRITE_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS);
    } else {
        loadContacts();
    }