Android example source code file (SystemServer.java)

This example Android source code file (SystemServer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Android by Example" ^TM.

Java - Android tags/keywords

adbsettingsobserver, android, appwidgetservice, bluetooth, content, dockobserver, failure, manager, override, recognitionmanagerservice, server, service, statusbarservice, systemserver, throttleservice, throwable, uimodemanagerservice, util, utilities, utils

The SystemServer.java Android example source code

/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.server;

import com.android.server.am.ActivityManagerService;
import com.android.server.status.StatusBarService;
import com.android.internal.os.BinderInternal;
import com.android.internal.os.SamplingProfilerIntegration;

import dalvik.system.VMRuntime;
import dalvik.system.Zygote;

import android.app.ActivityManagerNative;
import android.bluetooth.BluetoothAdapter;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.ContentService;
import android.content.Context;
import android.content.Intent;
import android.content.pm.IPackageManager;
import android.database.ContentObserver;
import android.database.Cursor;
import android.media.AudioService;
import android.os.*;
import android.provider.Contacts.People;
import android.provider.Settings;
import android.server.BluetoothA2dpService;
import android.server.BluetoothService;
import android.server.search.SearchManagerService;
import android.util.EventLog;
import android.util.Slog;
import android.accounts.AccountManagerService;

import java.io.File;
import java.util.Timer;
import java.util.TimerTask;

class ServerThread extends Thread {
    private static final String TAG = "SystemServer";
    private final static boolean INCLUDE_DEMO = false;

    private static final int LOG_BOOT_PROGRESS_SYSTEM_RUN = 3010;

    private ContentResolver mContentResolver;

    private class AdbSettingsObserver extends ContentObserver {
        public AdbSettingsObserver() {
            super(null);
        }
        @Override
        public void onChange(boolean selfChange) {
            boolean enableAdb = (Settings.Secure.getInt(mContentResolver,
                Settings.Secure.ADB_ENABLED, 0) > 0);
            // setting this secure property will start or stop adbd
           SystemProperties.set("persist.service.adb.enable", enableAdb ? "1" : "0");
        }
    }

    @Override
    public void run() {
        EventLog.writeEvent(EventLogTags.BOOT_PROGRESS_SYSTEM_RUN,
            SystemClock.uptimeMillis());

        Looper.prepare();

        android.os.Process.setThreadPriority(
                android.os.Process.THREAD_PRIORITY_FOREGROUND);

        BinderInternal.disableBackgroundScheduling(true);
        
        String factoryTestStr = SystemProperties.get("ro.factorytest");
        int factoryTest = "".equals(factoryTestStr) ? SystemServer.FACTORY_TEST_OFF
                : Integer.parseInt(factoryTestStr);

        LightsService lights = null;
        PowerManagerService power = null;
        BatteryService battery = null;
        ConnectivityService connectivity = null;
        IPackageManager pm = null;
        Context context = null;
        WindowManagerService wm = null;
        BluetoothService bluetooth = null;
        BluetoothA2dpService bluetoothA2dp = null;
        HeadsetObserver headset = null;
        DockObserver dock = null;
        UiModeManagerService uiMode = null;
        RecognitionManagerService recognition = null;
        ThrottleService throttle = null;

        // Critical services...
        try {
            Slog.i(TAG, "Entropy Service");
            ServiceManager.addService("entropy", new EntropyService());

            Slog.i(TAG, "Power Manager");
            power = new PowerManagerService();
            ServiceManager.addService(Context.POWER_SERVICE, power);

            Slog.i(TAG, "Activity Manager");
            context = ActivityManagerService.main(factoryTest);

            Slog.i(TAG, "Telephony Registry");
            ServiceManager.addService("telephony.registry", new TelephonyRegistry(context));

            AttributeCache.init(context);

            Slog.i(TAG, "Package Manager");
            pm = PackageManagerService.main(context,
                    factoryTest != SystemServer.FACTORY_TEST_OFF);

            ActivityManagerService.setSystemProcess();

            mContentResolver = context.getContentResolver();

            // The AccountManager must come before the ContentService
            try {
                Slog.i(TAG, "Account Manager");
                ServiceManager.addService(Context.ACCOUNT_SERVICE,
                        new AccountManagerService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Account Manager", e);
            }

            Slog.i(TAG, "Content Manager");
            ContentService.main(context,
                    factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL);

            Slog.i(TAG, "System Content Providers");
            ActivityManagerService.installSystemProviders();

            Slog.i(TAG, "Battery Service");
            battery = new BatteryService(context);
            ServiceManager.addService("battery", battery);

            Slog.i(TAG, "Lights Service");
            lights = new LightsService(context);

            Slog.i(TAG, "Vibrator Service");
            ServiceManager.addService("vibrator", new VibratorService(context));

            // only initialize the power service after we have started the
            // lights service, content providers and the battery service.
            power.init(context, lights, ActivityManagerService.getDefault(), battery);

            Slog.i(TAG, "Alarm Manager");
            AlarmManagerService alarm = new AlarmManagerService(context);
            ServiceManager.addService(Context.ALARM_SERVICE, alarm);

            Slog.i(TAG, "Init Watchdog");
            Watchdog.getInstance().init(context, battery, power, alarm,
                    ActivityManagerService.self());

            // Sensor Service is needed by Window Manager, so this goes first
            Slog.i(TAG, "Sensor Service");
            ServiceManager.addService(Context.SENSOR_SERVICE, new SensorService(context));

            Slog.i(TAG, "Window Manager");
            wm = WindowManagerService.main(context, power,
                    factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL);
            ServiceManager.addService(Context.WINDOW_SERVICE, wm);

            ((ActivityManagerService)ServiceManager.getService("activity"))
                    .setWindowManager(wm);

            // Skip Bluetooth if we have an emulator kernel
            // TODO: Use a more reliable check to see if this product should
            // support Bluetooth - see bug 988521
            if (SystemProperties.get("ro.kernel.qemu").equals("1")) {
                Slog.i(TAG, "Registering null Bluetooth Service (emulator)");
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null);
            } else if (factoryTest == SystemServer.FACTORY_TEST_LOW_LEVEL) {
                Slog.i(TAG, "Registering null Bluetooth Service (factory test)");
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, null);
            } else {
                Slog.i(TAG, "Bluetooth Service");
                bluetooth = new BluetoothService(context);
                ServiceManager.addService(BluetoothAdapter.BLUETOOTH_SERVICE, bluetooth);
                bluetooth.initAfterRegistration();
                bluetoothA2dp = new BluetoothA2dpService(context, bluetooth);
                ServiceManager.addService(BluetoothA2dpService.BLUETOOTH_A2DP_SERVICE,
                                          bluetoothA2dp);

                int bluetoothOn = Settings.Secure.getInt(mContentResolver,
                    Settings.Secure.BLUETOOTH_ON, 0);
                if (bluetoothOn > 0) {
                    bluetooth.enable();
                }
            }

        } catch (RuntimeException e) {
            Slog.e("System", "Failure starting core service", e);
        }

        DevicePolicyManagerService devicePolicy = null;
        StatusBarService statusBar = null;
        InputMethodManagerService imm = null;
        AppWidgetService appWidget = null;
        NotificationManagerService notification = null;
        WallpaperManagerService wallpaper = null;
        LocationManagerService location = null;

        if (factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL) {
            try {
                Slog.i(TAG, "Device Policy");
                devicePolicy = new DevicePolicyManagerService(context);
                ServiceManager.addService(Context.DEVICE_POLICY_SERVICE, devicePolicy);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting DevicePolicyService", e);
            }

            try {
                Slog.i(TAG, "Status Bar");
                statusBar = new StatusBarService(context);
                ServiceManager.addService(Context.STATUS_BAR_SERVICE, statusBar);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting StatusBarService", e);
            }

            try {
                Slog.i(TAG, "Clipboard Service");
                ServiceManager.addService(Context.CLIPBOARD_SERVICE,
                        new ClipboardService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Clipboard Service", e);
            }

            try {
                Slog.i(TAG, "Input Method Service");
                imm = new InputMethodManagerService(context, statusBar);
                ServiceManager.addService(Context.INPUT_METHOD_SERVICE, imm);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Input Manager Service", e);
            }

            try {
                Slog.i(TAG, "NetStat Service");
                ServiceManager.addService("netstat", new NetStatService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting NetStat Service", e);
            }

            try {
                Slog.i(TAG, "NetworkManagement Service");
                ServiceManager.addService(
                        Context.NETWORKMANAGEMENT_SERVICE, new NetworkManagementService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting NetworkManagement Service", e);
            }

            try {
                Slog.i(TAG, "Connectivity Service");
                connectivity = ConnectivityService.getInstance(context);
                ServiceManager.addService(Context.CONNECTIVITY_SERVICE, connectivity);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Connectivity Service", e);
            }

            try {
                Slog.i(TAG, "Throttle Service");
                throttle = new ThrottleService(context);
                ServiceManager.addService(
                        Context.THROTTLE_SERVICE, throttle);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting ThrottleService", e);
            }

            try {
              Slog.i(TAG, "Accessibility Manager");
              ServiceManager.addService(Context.ACCESSIBILITY_SERVICE,
                      new AccessibilityManagerService(context));
            } catch (Throwable e) {
              Slog.e(TAG, "Failure starting Accessibility Manager", e);
            }

            try {
                /*
                 * NotificationManagerService is dependant on MountService,
                 * (for media / usb notifications) so we must start MountService first.
                 */
                Slog.i(TAG, "Mount Service");
                ServiceManager.addService("mount", new MountService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Mount Service", e);
            }

            try {
                Slog.i(TAG, "Notification Manager");
                notification = new NotificationManagerService(context, statusBar, lights);
                ServiceManager.addService(Context.NOTIFICATION_SERVICE, notification);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Notification Manager", e);
            }

            try {
                Slog.i(TAG, "Device Storage Monitor");
                ServiceManager.addService(DeviceStorageMonitorService.SERVICE,
                        new DeviceStorageMonitorService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting DeviceStorageMonitor service", e);
            }

            try {
                Slog.i(TAG, "Location Manager");
                location = new LocationManagerService(context);
                ServiceManager.addService(Context.LOCATION_SERVICE, location);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Location Manager", e);
            }

            try {
                Slog.i(TAG, "Search Service");
                ServiceManager.addService(Context.SEARCH_SERVICE,
                        new SearchManagerService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Search Service", e);
            }

            if (INCLUDE_DEMO) {
                Slog.i(TAG, "Installing demo data...");
                (new DemoThread(context)).start();
            }

            try {
                Slog.i(TAG, "DropBox Service");
                ServiceManager.addService(Context.DROPBOX_SERVICE,
                        new DropBoxManagerService(context, new File("/data/system/dropbox")));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting DropBoxManagerService", e);
            }

            try {
                Slog.i(TAG, "Wallpaper Service");
                wallpaper = new WallpaperManagerService(context);
                ServiceManager.addService(Context.WALLPAPER_SERVICE, wallpaper);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Wallpaper Service", e);
            }

            try {
                Slog.i(TAG, "Audio Service");
                ServiceManager.addService(Context.AUDIO_SERVICE, new AudioService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Audio Service", e);
            }

            try {
                Slog.i(TAG, "Headset Observer");
                // Listen for wired headset changes
                headset = new HeadsetObserver(context);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting HeadsetObserver", e);
            }

            try {
                Slog.i(TAG, "Dock Observer");
                // Listen for dock station changes
                dock = new DockObserver(context, power);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting DockObserver", e);
            }

            try {
                Slog.i(TAG, "UI Mode Manager Service");
                // Listen for dock station changes
                uiMode = new UiModeManagerService(context);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting UiModeManagerService", e);
            }

            try {
                Slog.i(TAG, "Backup Service");
                ServiceManager.addService(Context.BACKUP_SERVICE,
                        new BackupManagerService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Backup Service", e);
            }

            try {
                Slog.i(TAG, "AppWidget Service");
                appWidget = new AppWidgetService(context);
                ServiceManager.addService(Context.APPWIDGET_SERVICE, appWidget);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting AppWidget Service", e);
            }

            try {
                Slog.i(TAG, "Recognition Service");
                recognition = new RecognitionManagerService(context);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting Recognition Service", e);
            }

            try {
                com.android.server.status.StatusBarPolicy.installIcons(context, statusBar);
            } catch (Throwable e) {
                Slog.e(TAG, "Failure installing status bar icons", e);
            }

            try {
                Slog.i(TAG, "DiskStats Service");
                ServiceManager.addService("diskstats", new DiskStatsService(context));
            } catch (Throwable e) {
                Slog.e(TAG, "Failure starting DiskStats Service", e);
            }
        }

        // make sure the ADB_ENABLED setting value matches the secure property value
        Settings.Secure.putInt(mContentResolver, Settings.Secure.ADB_ENABLED,
                "1".equals(SystemProperties.get("persist.service.adb.enable")) ? 1 : 0);

        // register observer to listen for settings changes
        mContentResolver.registerContentObserver(Settings.Secure.getUriFor(Settings.Secure.ADB_ENABLED),
                false, new AdbSettingsObserver());

        // Before things start rolling, be sure we have decided whether
        // we are in safe mode.
        final boolean safeMode = wm.detectSafeMode();
        if (safeMode) {
            try {
                ActivityManagerNative.getDefault().enterSafeMode();
                // Post the safe mode state in the Zygote class
                Zygote.systemInSafeMode = true;
                // Disable the JIT for the system_server process
                VMRuntime.getRuntime().disableJitCompilation();
            } catch (RemoteException e) {
            }
        } else {
            // Enable the JIT for the system_server process
            VMRuntime.getRuntime().startJitCompilation();
        }

        // It is now time to start up the app processes...

        if (devicePolicy != null) {
            devicePolicy.systemReady();
        }

        if (notification != null) {
            notification.systemReady();
        }

        if (statusBar != null) {
            statusBar.systemReady();
        }
        wm.systemReady();
        power.systemReady();
        try {
            pm.systemReady();
        } catch (RemoteException e) {
        }

        // These are needed to propagate to the runnable below.
        final BatteryService batteryF = battery;
        final ConnectivityService connectivityF = connectivity;
        final DockObserver dockF = dock;
        final ThrottleService throttleF = throttle;
        final UiModeManagerService uiModeF = uiMode;
        final AppWidgetService appWidgetF = appWidget;
        final WallpaperManagerService wallpaperF = wallpaper;
        final InputMethodManagerService immF = imm;
        final RecognitionManagerService recognitionF = recognition;
        final LocationManagerService locationF = location;

        // We now tell the activity manager it is okay to run third party
        // code.  It will call back into us once it has gotten to the state
        // where third party code can really run (but before it has actually
        // started launching the initial applications), for us to complete our
        // initialization.
        ((ActivityManagerService)ActivityManagerNative.getDefault())
                .systemReady(new Runnable() {
            public void run() {
                Slog.i(TAG, "Making services ready");

                if (batteryF != null) batteryF.systemReady();
                if (connectivityF != null) connectivityF.systemReady();
                if (dockF != null) dockF.systemReady();
                if (uiModeF != null) uiModeF.systemReady();
                if (recognitionF != null) recognitionF.systemReady();
                Watchdog.getInstance().start();

                // It is now okay to let the various system services start their
                // third party code...

                if (appWidgetF != null) appWidgetF.systemReady(safeMode);
                if (wallpaperF != null) wallpaperF.systemReady();
                if (immF != null) immF.systemReady();
                if (locationF != null) locationF.systemReady();
                if (throttleF != null) throttleF.systemReady();
            }
        });

        Looper.loop();
        Slog.d(TAG, "System ServerThread is exiting!");
    }
}

class DemoThread extends Thread
{
    DemoThread(Context context)
    {
        mContext = context;
    }

    @Override
    public void run()
    {
        try {
            Cursor c = mContext.getContentResolver().query(People.CONTENT_URI, null, null, null, null);
            boolean hasData = c != null && c.moveToFirst();
            if (c != null) {
                c.deactivate();
            }
            if (!hasData) {
                DemoDataSet dataset = new DemoDataSet();
                dataset.add(mContext);
            }
        } catch (Throwable e) {
            Slog.e("SystemServer", "Failure installing demo data", e);
        }

    }

    Context mContext;
}

public class SystemServer
{
    private static final String TAG = "SystemServer";

    public static final int FACTORY_TEST_OFF = 0;
    public static final int FACTORY_TEST_LOW_LEVEL = 1;
    public static final int FACTORY_TEST_HIGH_LEVEL = 2;

    static Timer timer;
    static final long SNAPSHOT_INTERVAL = 60 * 60 * 1000; // 1hr

    /**
     * This method is called from Zygote to initialize the system. This will cause the native
     * services (SurfaceFlinger, AudioFlinger, etc..) to be started. After that it will call back
     * up into init2() to start the Android services.
     */
    native public static void init1(String[] args);

    public static void main(String[] args) {
        if (SamplingProfilerIntegration.isEnabled()) {
            SamplingProfilerIntegration.start();
            timer = new Timer();
            timer.schedule(new TimerTask() {
                @Override
                public void run() {
                    SamplingProfilerIntegration.writeSnapshot("system_server");
                }
            }, SNAPSHOT_INTERVAL, SNAPSHOT_INTERVAL);
        }

        // The system server has to run all of the time, so it needs to be
        // as efficient as possible with its memory usage.
        VMRuntime.getRuntime().setTargetHeapUtilization(0.8f);
        
        System.loadLibrary("android_servers");
        init1(args);
    }

    public static final void init2() {
        Slog.i(TAG, "Entered the Android system server!");
        Thread thr = new ServerThread();
        thr.setName("android.server.ServerThread");
        thr.start();
    }
}