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      1 /*
      2  * Copyright (C) 2015 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License
     15  */
     16 
     17 package com.android.inputmethod.latin.permissions;
     18 
     19 
     20 import android.app.Activity;
     21 import android.content.Context;
     22 import android.content.Intent;
     23 import android.os.Bundle;
     24 import android.support.annotation.NonNull;
     25 import android.support.v4.app.ActivityCompat;
     26 
     27 /**
     28  * An activity to help request permissions. It's used when no other activity is available, e.g. in
     29  * InputMethodService. This activity assumes that all permissions are not granted yet.
     30  */
     31 public final class PermissionsActivity
     32         extends Activity implements ActivityCompat.OnRequestPermissionsResultCallback {
     33 
     34     /**
     35      * Key to retrieve requested permissions from the intent.
     36      */
     37     public static final String EXTRA_PERMISSION_REQUESTED_PERMISSIONS = "requested_permissions";
     38 
     39     /**
     40      * Key to retrieve request code from the intent.
     41      */
     42     public static final String EXTRA_PERMISSION_REQUEST_CODE = "request_code";
     43 
     44     private static final int INVALID_REQUEST_CODE = -1;
     45 
     46     private int mPendingRequestCode = INVALID_REQUEST_CODE;
     47 
     48     /**
     49      * Starts a PermissionsActivity and checks/requests supplied permissions.
     50      */
     51     public static void run(
     52             @NonNull Context context, int requestCode, @NonNull String... permissionStrings) {
     53         Intent intent = new Intent(context.getApplicationContext(), PermissionsActivity.class);
     54         intent.putExtra(EXTRA_PERMISSION_REQUESTED_PERMISSIONS, permissionStrings);
     55         intent.putExtra(EXTRA_PERMISSION_REQUEST_CODE, requestCode);
     56         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS);
     57         context.startActivity(intent);
     58     }
     59 
     60     @Override
     61     protected void onCreate(Bundle savedInstanceState) {
     62         super.onCreate(savedInstanceState);
     63         mPendingRequestCode = (savedInstanceState != null)
     64                 ? savedInstanceState.getInt(EXTRA_PERMISSION_REQUEST_CODE, INVALID_REQUEST_CODE)
     65                 : INVALID_REQUEST_CODE;
     66     }
     67 
     68     @Override
     69     protected void onSaveInstanceState(Bundle outState) {
     70         super.onSaveInstanceState(outState);
     71         outState.putInt(EXTRA_PERMISSION_REQUEST_CODE, mPendingRequestCode);
     72     }
     73 
     74     @Override
     75     protected void onResume() {
     76         super.onResume();
     77         // Only do request when there is no pending request to avoid duplicated requests.
     78         if (mPendingRequestCode == INVALID_REQUEST_CODE) {
     79             final Bundle extras = getIntent().getExtras();
     80             final String[] permissionsToRequest =
     81                     extras.getStringArray(EXTRA_PERMISSION_REQUESTED_PERMISSIONS);
     82             mPendingRequestCode = extras.getInt(EXTRA_PERMISSION_REQUEST_CODE);
     83             // Assuming that all supplied permissions are not granted yet, so that we don't need to
     84             // check them again.
     85             PermissionsUtil.requestPermissions(this, mPendingRequestCode, permissionsToRequest);
     86         }
     87     }
     88 
     89     @Override
     90     public void onRequestPermissionsResult(
     91             int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
     92         mPendingRequestCode = INVALID_REQUEST_CODE;
     93         PermissionsManager.get(this).onRequestPermissionsResult(
     94                 requestCode, permissions, grantResults);
     95         finish();
     96     }
     97 }
     98