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 25 import androidx.annotation.VisibleForTesting; 26 import androidx.preference.Preference; 27 import androidx.preference.SwitchPreference; 28 29 import com.android.settings.core.PreferenceControllerMixin; 30 import com.android.settingslib.development.DeveloperOptionsPreferenceController; 31 32 public class ShowSurfaceUpdatesPreferenceController extends DeveloperOptionsPreferenceController 33 implements Preference.OnPreferenceChangeListener, PreferenceControllerMixin { 34 35 private static final String SHOW_SCREEN_UPDATES_KEY = "show_screen_updates"; 36 37 private static final int SETTING_VALUE_ON = 1; 38 private static final int SETTING_VALUE_OFF = 0; 39 40 @VisibleForTesting 41 static final String SURFACE_FLINGER_SERVICE_KEY = "SurfaceFlinger"; 42 @VisibleForTesting 43 static final int SURFACE_FLINGER_READ_CODE = 1010; 44 45 private static final int SURFACE_FLINGER_WRITE_SURFACE_UPDATES_CODE = 1002; 46 private static final String SURFACE_COMPOSER_INTERFACE_KEY = "android.ui.ISurfaceComposer"; 47 48 private final IBinder mSurfaceFlinger; 49 ShowSurfaceUpdatesPreferenceController(Context context)50 public ShowSurfaceUpdatesPreferenceController(Context context) { 51 super(context); 52 mSurfaceFlinger = ServiceManager.getService(SURFACE_FLINGER_SERVICE_KEY); 53 } 54 55 @Override getPreferenceKey()56 public String getPreferenceKey() { 57 return SHOW_SCREEN_UPDATES_KEY; 58 } 59 60 @Override onPreferenceChange(Preference preference, Object newValue)61 public boolean onPreferenceChange(Preference preference, Object newValue) { 62 final boolean isEnabled = (Boolean) newValue; 63 writeShowUpdatesSetting(isEnabled); 64 return true; 65 } 66 67 @Override updateState(Preference preference)68 public void updateState(Preference preference) { 69 updateShowUpdatesSetting(); 70 } 71 72 @Override onDeveloperOptionsSwitchDisabled()73 protected void onDeveloperOptionsSwitchDisabled() { 74 super.onDeveloperOptionsSwitchDisabled(); 75 final SwitchPreference preference = (SwitchPreference) mPreference; 76 if (preference.isChecked()) { 77 // Writing false to the preference when the setting is already off will have a 78 // side effect of turning on the preference that we wish to avoid 79 writeShowUpdatesSetting(false); 80 preference.setChecked(false); 81 } 82 } 83 84 @VisibleForTesting updateShowUpdatesSetting()85 void updateShowUpdatesSetting() { 86 // magic communication with surface flinger. 87 try { 88 if (mSurfaceFlinger != null) { 89 final Parcel data = Parcel.obtain(); 90 final Parcel reply = Parcel.obtain(); 91 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 92 mSurfaceFlinger.transact(SURFACE_FLINGER_READ_CODE, data, reply, 0 /* flags */); 93 @SuppressWarnings("unused") final int showCpu = reply.readInt(); 94 @SuppressWarnings("unused") final int enableGL = reply.readInt(); 95 final int showUpdates = reply.readInt(); 96 ((SwitchPreference) mPreference).setChecked(showUpdates != SETTING_VALUE_OFF); 97 reply.recycle(); 98 data.recycle(); 99 } 100 } catch (RemoteException ex) { 101 // intentional no-op 102 } 103 } 104 105 @VisibleForTesting writeShowUpdatesSetting(boolean isEnabled)106 void writeShowUpdatesSetting(boolean isEnabled) { 107 try { 108 if (mSurfaceFlinger != null) { 109 final Parcel data = Parcel.obtain(); 110 data.writeInterfaceToken(SURFACE_COMPOSER_INTERFACE_KEY); 111 final int showUpdates = isEnabled ? SETTING_VALUE_ON : SETTING_VALUE_OFF; 112 data.writeInt(showUpdates); 113 mSurfaceFlinger.transact(SURFACE_FLINGER_WRITE_SURFACE_UPDATES_CODE, data, 114 null /* reply */, 0 /* flags */); 115 data.recycle(); 116 } 117 } catch (RemoteException ex) { 118 // intentional no-op 119 } 120 updateShowUpdatesSetting(); 121 } 122 } 123