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.app.ActivityManager; 20 import android.app.IActivityManager; 21 import android.content.Context; 22 import android.os.RemoteException; 23 24 import androidx.annotation.VisibleForTesting; 25 import androidx.preference.ListPreference; 26 import androidx.preference.Preference; 27 28 import com.android.settings.R; 29 import com.android.settings.core.PreferenceControllerMixin; 30 import com.android.settingslib.development.DeveloperOptionsPreferenceController; 31 32 public class BackgroundProcessLimitPreferenceController extends 33 DeveloperOptionsPreferenceController implements Preference.OnPreferenceChangeListener, 34 PreferenceControllerMixin { 35 36 private static final String APP_PROCESS_LIMIT_KEY = "app_process_limit"; 37 38 private final String[] mListValues; 39 private final String[] mListSummaries; 40 BackgroundProcessLimitPreferenceController(Context context)41 public BackgroundProcessLimitPreferenceController(Context context) { 42 super(context); 43 44 mListValues = context.getResources().getStringArray(R.array.app_process_limit_values); 45 mListSummaries = context.getResources().getStringArray(R.array.app_process_limit_entries); 46 } 47 48 @Override getPreferenceKey()49 public String getPreferenceKey() { 50 return APP_PROCESS_LIMIT_KEY; 51 } 52 53 @Override onPreferenceChange(Preference preference, Object newValue)54 public boolean onPreferenceChange(Preference preference, Object newValue) { 55 writeAppProcessLimitOptions(newValue); 56 updateAppProcessLimitOptions(); 57 return true; 58 } 59 60 @Override updateState(Preference preference)61 public void updateState(Preference preference) { 62 updateAppProcessLimitOptions(); 63 } 64 65 @Override onDeveloperOptionsSwitchDisabled()66 protected void onDeveloperOptionsSwitchDisabled() { 67 super.onDeveloperOptionsSwitchDisabled(); 68 writeAppProcessLimitOptions(null); 69 } 70 updateAppProcessLimitOptions()71 private void updateAppProcessLimitOptions() { 72 try { 73 final int limit = getActivityManagerService().getProcessLimit(); 74 int index = 0; // default 75 for (int i = 0; i < mListValues.length; i++) { 76 int val = Integer.parseInt(mListValues[i]); 77 if (val >= limit) { 78 index = i; 79 break; 80 } 81 } 82 final ListPreference listPreference = (ListPreference) mPreference; 83 listPreference.setValue(mListValues[index]); 84 listPreference.setSummary(mListSummaries[index]); 85 } catch (RemoteException e) { 86 // intentional no-op 87 } 88 } 89 writeAppProcessLimitOptions(Object newValue)90 private void writeAppProcessLimitOptions(Object newValue) { 91 try { 92 final int limit = newValue != null ? Integer.parseInt(newValue.toString()) : -1; 93 getActivityManagerService().setProcessLimit(limit); 94 updateAppProcessLimitOptions(); 95 } catch (RemoteException e) { 96 // intentional no-op 97 } 98 } 99 100 @VisibleForTesting getActivityManagerService()101 IActivityManager getActivityManagerService() { 102 return ActivityManager.getService(); 103 } 104 } 105