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.tv; 18 19 import android.app.Activity; 20 import android.content.ActivityNotFoundException; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.os.Bundle; 24 import android.util.Log; 25 26 /** 27 * An activity to launch a new activity. 28 * 29 * <p>In the case when {@link MainActivity} starts a new activity using {@link 30 * Activity#startActivity} or {@link Activity#startActivityForResult}, TV app is terminated if the 31 * new activity crashes. That's because the {@link android.app.ActivityManager} terminates the 32 * activity which is just below the crashed activity in the activity stack. To avoid this, we need 33 * to locate an additional activity between these activities in the activity stack. 34 */ 35 public class LauncherActivity extends Activity { 36 private static final String TAG = "LauncherActivity"; 37 38 public static final String ERROR_MESSAGE = "com.android.tv.LauncherActivity.ErrorMessage"; 39 40 private static final int REQUEST_CODE_DEFAULT = 0; 41 private static final int REQUEST_START_ACTIVITY = 100; 42 43 private static final String EXTRA_INTENT = "com.android.tv.LauncherActivity.INTENT"; 44 private static final String EXTRA_REQUEST_RESULT = 45 "com.android.tv.LauncherActivity.REQUEST_RESULT"; 46 47 /** Starts an activity by calling {@link Activity#startActivity}. */ startActivitySafe(Activity baseActivity, Intent intentToLaunch)48 public static void startActivitySafe(Activity baseActivity, Intent intentToLaunch) { 49 // To avoid the app termination when the new activity crashes, LauncherActivity should be 50 // started by calling startActivityForResult(). 51 baseActivity.startActivityForResult( 52 createIntent(baseActivity, intentToLaunch, false), REQUEST_CODE_DEFAULT); 53 } 54 createIntent( Context context, Intent intentToLaunch, boolean requestResult)55 private static Intent createIntent( 56 Context context, Intent intentToLaunch, boolean requestResult) { 57 Intent intent = new Intent(context, LauncherActivity.class); 58 intent.putExtra(EXTRA_INTENT, intentToLaunch); 59 if (requestResult) { 60 intent.putExtra(EXTRA_REQUEST_RESULT, true); 61 } 62 return intent; 63 } 64 65 @Override onCreate(Bundle savedInstanceState)66 public void onCreate(Bundle savedInstanceState) { 67 super.onCreate(savedInstanceState); 68 // We should launch the new activity in onCreate rather than in onStart. 69 // That's because it is not guaranteed that onStart is called only once. 70 Intent intent = getIntent().getParcelableExtra(EXTRA_INTENT); 71 boolean requestResult = getIntent().getBooleanExtra(EXTRA_REQUEST_RESULT, false); 72 try { 73 if (requestResult) { 74 startActivityForResult(intent, REQUEST_START_ACTIVITY); 75 } else { 76 startActivity(intent); 77 setResult(Activity.RESULT_OK); 78 finish(); 79 } 80 } catch (ActivityNotFoundException e) { 81 Log.w(TAG, "Activity not found for " + intent); 82 intent.putExtra(ERROR_MESSAGE, getResources().getString(R.string.msg_missing_app)); 83 setResult(Activity.RESULT_CANCELED, intent); 84 finish(); 85 } 86 } 87 88 @Override onActivityResult(int requestCode, int resultCode, Intent data)89 public void onActivityResult(int requestCode, int resultCode, Intent data) { 90 setResult(resultCode, data); 91 finish(); 92 } 93 } 94