进程保护

final void removeLruProcessLocked(ProcessRecord app) {
    /.......
    if (lrui >= 0) {
        if (!app.killed) {
            Slog.wtfStack(TAG, "Removing process that hasn't been killed: " + app);
            Process.killProcessQuiet(app.pid);
        }
    /.......
    }
}

final void removeLruProcessLocked(ProcessRecord app) {
    /.......
    if (lrui >= 0) {
        if (!app.killed) {
            Slog.wtfStack(TAG, "Removing process that hasn't been killed: " + app);
            Process.killProcessQuiet(app.pid);
            Process.killProcessGroup(app.info.uid, app.pid);//同组杀
        }
        /.......
    }
}

public int onStartCommand(Intent intent, int flags, int startId) {  
     flags = START_STICKY;  
     return super.onStartCommand(intent, flags, startId);  
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    startForeground(R.id.notify, new Notification());
    startService(new Intent(this, FakeService.class));
    return super.onStartCommand(intent, flags, startId);
}

public class FakeService extends Service {    
    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        startForeground(R.id.notify, new Notification());
        stopSelf();
        return super.onStartCommand(intent, flags, startId);
    }

    @Override
    public void onDestroy() {
        stopForeground(true);
        super.onDestroy();
    }
}

<service android:name=".ForegroundEnablingService" />
<service android:name=".ForegroundService" />

<receiver android:name="com.dbjtech.acbxt.waiqin.BootReceiver" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.USER_PRESENT" />
            <action android:name="android.intent.action.PACKAGE_RESTARTED" />
            <action android:name="com.dbjtech.waiqin.destroy" />
        </intent-filter>
</receiver>

    @Override
    public void onReceive(Context context, Intent intent) {
        if (Intent.ACTION_BOOT_COMPLETED.equals(intent.getAction())) {
            System.out.println("手机开机了....");
            startUploadService(context);
        }
        if (Intent.ACTION_USER_PRESENT.equals(intent.getAction())) {
                startUploadService(context);
        }
    }

@Override
public void onDestroy() {
    Intent intent = new Intent(this, KeeLiveService.class);
    startService(intent);
    super.onDestroy();
}

public void startKeepLiveService(Context context, int timeMillis, String action) {
    //获取AlarmManager系统服务
    AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
    //包装Intent
    Intent intent = new Intent(context,KeepLiveServie.class);
    intent.setAction(action);
    PendingIntent pendingIntent = PendingIntent.getService(context,0,intent, PendingIntent.FLAG_UPDATE_CURRENT);
    //添加到AlarmManager
    alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,System.currentTimeMillis(),timeMillis,pendingIntent);
}

public class MainActivity extends AppCompatActivity {
    private static final StringTAG="keeplive";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //setContentView(R.layout.activity_main);
        Window window = getWindow();
        window.setGravity(Gravity.LEFT|Gravity.TOP);
        WindowManager.LayoutParams params = window.getAttributes();
        params.x=0;
        params.y=0;
        params.height=1;
        params.width=1;
        window.setAttributes(params);
    }
}

//排除 Activity 在 RecentTask 中的显示
<activity
    android:name=".KeepAliveActivity"
    android:excludeFromRecents="true"
    android:exported="false"
    android:finishOnTaskLaunch="false"
    android:launchMode="singleInstance"
    android:process=":live"
    android:theme="@style/LiveActivityStyle"
    >
</activity>

//控制 Activity 为透明
<stylename="LiveActivityStyle">
   <itemname="android:windowBackground">@android:color/transparent</item>
   <itemname="android:windowFrame">@null</item>
   <itemname="android:windowNoTitle">true</item>
   <itemname="android:windowIsFloating">true</item>
   <itemname="android:windowIsTranslucent">true</item>
   <itemname="android:windowContentOverlay">@null</item>
   <itemname="android:windowAnimationStyle">@null</item>
   <itemname="android:windowDisablePreview">true</item>
   <itemname="android:windowNoDisplay">true</item>
</style>

//Activity 启动与销毁时机的控制
public class KeepLiveReceiver extends BroadcastReceiver {
    privateContextmContext;

    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        if (action.equals(Intent.ACTION_SCREEN_OFF)) {
            KeepLiveManeger.getInstance(mContext).startKeepLiveActivity();
        } else if (action.equals(Intent.ACTION_USER_PRESENT)) {
            KeepLiveManeger.getInstance(mContext).destroyKeepLiveActivity();
        }
        KeepLiveManeger.getInstance(mContext).startKeepLiveService();
    }
}