1 /* 2 * Copyright (C) 2025 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.servicestests.apps.topologytestapp; 18 19 import android.app.Activity; 20 import android.content.Intent; 21 import android.hardware.display.DisplayManager; 22 import android.hardware.display.DisplayTopology; 23 import android.os.Bundle; 24 import android.os.Message; 25 import android.os.Messenger; 26 import android.os.Process; 27 import android.os.RemoteException; 28 import android.util.Log; 29 30 import java.util.function.Consumer; 31 32 /** 33 * A simple activity listening to topology updates 34 */ 35 public class TopologyUpdateActivity extends Activity { 36 public static final int MESSAGE_LAUNCHED = 1; 37 public static final int MESSAGE_CALLBACK = 2; 38 39 private static final String TAG = TopologyUpdateActivity.class.getSimpleName(); 40 41 private static final String TEST_MESSENGER = "MESSENGER"; 42 43 private Messenger mMessenger; 44 private DisplayManager mDisplayManager; 45 private final Consumer<DisplayTopology> mTopologyListener = this::callback; 46 47 @Override onCreate(Bundle savedInstanceState)48 protected void onCreate(Bundle savedInstanceState) { 49 super.onCreate(savedInstanceState); 50 Intent intent = getIntent(); 51 mMessenger = intent.getParcelableExtra(TEST_MESSENGER, Messenger.class); 52 mDisplayManager = getApplicationContext().getSystemService(DisplayManager.class); 53 mDisplayManager.registerTopologyListener(getMainExecutor(), mTopologyListener); 54 launched(); 55 } 56 57 @Override onDestroy()58 protected void onDestroy() { 59 super.onDestroy(); 60 mDisplayManager.unregisterTopologyListener(mTopologyListener); 61 } 62 launched()63 private void launched() { 64 try { 65 Message msg = Message.obtain(); 66 msg.what = MESSAGE_LAUNCHED; 67 msg.arg1 = android.os.Process.myPid(); 68 msg.arg2 = Process.myUid(); 69 Log.d(TAG, "Launched"); 70 mMessenger.send(msg); 71 } catch (RemoteException e) { 72 e.rethrowAsRuntimeException(); 73 } 74 } 75 callback(DisplayTopology topology)76 private void callback(DisplayTopology topology) { 77 try { 78 Message msg = Message.obtain(); 79 msg.what = MESSAGE_CALLBACK; 80 msg.obj = topology; 81 Log.d(TAG, "Msg " + topology); 82 mMessenger.send(msg); 83 } catch (RemoteException e) { 84 e.rethrowAsRuntimeException(); 85 } 86 } 87 } 88