1 /*
2  * Copyright 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.managedprovisioning;
18 
19 import android.app.Activity;
20 import android.content.Context;
21 import android.content.Intent;
22 import android.os.Bundle;
23 
24 
25 /**
26  * A trampoline activity that starts a real activity in a new task. This is used so that we can call
27  * startActivityForResult() to start the real activity, from a non-activity context. The target
28  * activity can the check the caller by {@link Activity#getCallingPackage} or
29  * {@link Activity#getCallingActivity}.
30  */
31 public class TrampolineActivity extends Activity {
32     private static final String EXTRA_INTENT = "intent";
33     @Override
onCreate(Bundle savedInstanceState)34     protected void onCreate(Bundle savedInstanceState) {
35         super.onCreate(savedInstanceState);
36         Intent target = (Intent) getIntent().getParcelableExtra(EXTRA_INTENT);
37         if (target != null) {
38             // So that the target activity can get caller information via
39             // {@link Activity#getCallingPackage}.
40             startActivityForResult(target, 0);
41         }
42         finish();
43     }
44 
startActivity(Context context, Intent target)45     public static void startActivity(Context context, Intent target) {
46         context.startActivity(createIntent(context, target));
47     }
48 
createIntent(Context context, Intent target)49     public static Intent createIntent(Context context, Intent target) {
50         Intent intent = new Intent(context, TrampolineActivity.class);
51         intent.putExtra(EXTRA_INTENT, target);
52         intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
53         return intent;
54     }
55 }
56