1 /* 2 * Copyright (C) 2017 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.settings.development; 18 19 import android.content.Context; 20 import android.os.IBinder; 21 import android.os.Parcel; 22 import android.os.RemoteException; 23 import android.os.ServiceManager; 24 import android.support.annotation.VisibleForTesting; 25 import android.support.v14.preference.SwitchPreference; 26 import android.support.v7.preference.Preference; 27 28 import com.android.settings.core.PreferenceControllerMixin; 29 import com.android.settingslib.development.DeveloperOptionsPreferenceController; 30 31 public class ShowSurfaceUpdatesPreferenceController extends DeveloperOptionsPreferenceController 32 implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin { 33 34 private static final String SHOW_SCREEN_UPDATES_KEY = "show_screen_updates"; 35 36 private static final int SETTING_VALUE_ON = 1; 37 private static final int SETTING_VALUE_OFF = 0; 38 39 @VisibleForTesting 40 static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger"; 41 @VisibleForTesting 42 static final int SURFACE_FLINGER_READ_CODE = 1010; 43 44 private static final int SURFACE_FLINGER_WRITE_SURFACE_UPDATES_CODE = 1002; 45 private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer"; 46 47 private final IBinder mSurfaceFlinger; 48 ShowSurfaceUpdatesPreferenceController(Context context)49 public ShowSurfaceUpdatesPreferenceController(Context context) { 50 super(context); 51 mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY); 52 } 53 54 @Override getPreferenceKey()55 public String getPreferenceKey() { 56 return SHOW_SCREEN_UPDATES_KEY; 57 } 58 59 @Override onPreferenceChange(Preference preference, Object newValue)60 public boolean onPreferenceChange(Preference preference, Object newValue) { 61 final boolean isEnabled = (Boolean) newValue; 62 writeShowUpdatesSetting(isEnabled); 63 return true; 64 } 65 66 @Override updateState(Preference preference)67 public void updateState(Preference preference) { 68 updateShowUpdatesSetting(); 69 } 70 71 @Override onDeveloperOptionsSwitchDisabled()72 protected void onDeveloperOptionsSwitchDisabled() { 73 super.onDeveloperOptionsSwitchDisabled(); 74 final SwitchPreference preference = (SwitchPreference) mPreference; 75 if (preference.isChecked()) { 76 // Writing false to the preference when the setting is already off will have a 77 // side effect of turning on the preference that we wish to avoid 78 writeShowUpdatesSetting(false); 79 preference.setChecked(false); 80 } 81 } 82 83 @VisibleForTesting updateShowUpdatesSetting()84 void updateShowUpdatesSetting() { 85 // magic communication with surface flinger. 86 try { 87 if (mSurfaceFlinger != null) { 88 final Parcel data = Parcel.obtain(); 89 final Parcel reply = Parcel.obtain(); 90 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 91 mSurfaceFlinger.transact(SURFACE_FLINGER_READ_CODE, data, reply, 0 /* flags */); 92 @SuppressWarnings("unused") final int showCpu = reply.readInt(); 93 @SuppressWarnings("unused") final int enableGL = reply.readInt(); 94 final int showUpdates = reply.readInt(); 95 ((SwitchPreference) mPreference).setChecked(showUpdates != SETTING_VALUE_OFF); 96 reply.recycle(); 97 data.recycle(); 98 } 99 } catch (RemoteException ex) { 100 // intentional no-op 101 } 102 } 103 104 @VisibleForTesting writeShowUpdatesSetting(boolean isEnabled)105 void writeShowUpdatesSetting(boolean isEnabled) { 106 try { 107 if (mSurfaceFlinger != null) { 108 final Parcel data = Parcel.obtain(); 109 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 110 final int showUpdates = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF; 111 data.writeInt(showUpdates); 112 mSurfaceFlinger.transact(SURFACE_FLINGER_WRITE_SURFACE_UPDATES_CODE, data, 113 null /* reply */, 0 /* flags */); 114 data.recycle(); 115 } 116 } catch (RemoteException ex) { 117 // intentional no-op 118 } 119 updateShowUpdatesSetting(); 120 } 121 } 122