老婆保佑优俘，代碼無BUG

前言

項目中遇到一個需求京办，需要竟可能的上傳用戶的定位信息，引發(fā)了我對目前已知的狈溃活手段的探究惭婿，同時也遇到過客戶說，推送不能收到视搏，不能像微信那樣审孽，MMP的，不想理客戶

目錄

• 一：如何創(chuàng)建前臺服務(wù)
  • 1.DeskService 前臺服務(wù)
  • 2.移除前臺Service通知欄標(biāo)志
  • 3.注冊服務(wù)
  • 4.啟動服務(wù)
• 二：查看adj級別

一：如何創(chuàng)建前臺服務(wù)

1.DeskService 前臺服務(wù)

package com.cpsc.livedemo;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.util.Log;

/**
 * 描述:
 * <p>
 * Created by allens on 2018/1/31.
 */

public class DeskService extends Service {

    private static final String TAG = "DaemonService";
    public static final int NOTICE_ID = 100;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        Log.d(TAG, "DaemonService---->onCreate被調(diào)用浑娜，啟動前臺service");
        //如果API大于18佑力，需要彈出一個可見通知
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
            Notification.Builder builder = new Notification.Builder(this);
            builder.setSmallIcon(R.mipmap.ic_launcher);
            builder.setContentTitle("KeepAppAlive");
            builder.setContentText("DaemonService is runing...");
            startForeground(NOTICE_ID, builder.build());
            // 如果覺得常駐通知欄體驗不好
            // 可以通過啟動CancelNoticeService，將通知移除筋遭，oom_adj值不變
            Intent intent = new Intent(this, CancelNoticeService.class);
            startService(intent);
        } else {
            startForeground(NOTICE_ID, new Notification());
        }
    }


    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        // 如果Service被終止
        // 當(dāng)資源允許情況下打颤，重啟service
        return START_STICKY;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        // 如果Service被殺死暴拄，干掉通知
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR2) {
            NotificationManager mManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
            mManager.cancel(NOTICE_ID);
        }
        Log.d(TAG, "DaemonService---->onDestroy，前臺service被殺死");
        // 重啟自己
        Intent intent = new Intent(getApplicationContext(), DeskService.class);
        startService(intent);
    }

}

2.移除前臺Service通知欄標(biāo)志

package com.cpsc.livedemo;

import android.app.Notification;
import android.app.NotificationManager;
import android.app.Service;
import android.content.Intent;
import android.os.Build;
import android.os.IBinder;
import android.os.SystemClock;
import android.support.annotation.Nullable;

/**
 * 描述:
 * <p>
 * Created by allens on 2018/1/31.
 */

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

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (Build.VERSION.SDK_INT > Build.VERSION_CODES.JELLY_BEAN_MR2) {
            Notification.Builder builder = new Notification.Builder(this);
            builder.setSmallIcon(R.mipmap.ic_launcher);
            startForeground(DeskService.NOTICE_ID, builder.build());
            // 開啟一條線程编饺，去移除DaemonService彈出的通知
            new Thread(new Runnable() {
                @Override
                public void run() {
                    // 延遲1s
                    SystemClock.sleep(1000);
                    // 取消CancelNoticeService的前臺
                    stopForeground(true);
                    // 移除DaemonService彈出的通知
                    NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                    manager.cancel(DeskService.NOTICE_ID);
                    // 任務(wù)完成乖篷，終止自己
                    stopSelf();
                }
            }).start();
        }
        return super.onStartCommand(intent, flags, startId);
    }
}

3.注冊服務(wù)

        <service
            android:name=".DeskService"
            android:enabled="true"
            android:exported="true"
            android:process=":daemon_service" />


        <service
            android:name=".CancelNoticeService"
            android:enabled="true"
            android:exported="true"
            android:process=":service" />

4.啟動服務(wù)

 startService(new Intent(this, DeskService.class));

二：查看adj級別

adb shell

ps|grep <package_name> 查看基本信息

1|root@generic_x86:/ # ps|grep com.cpsc.livedemo                               
u0_a63    6834  1348  1285208 43884 SyS_epoll_ b73712b5 S com.cpsc.livedemo
u0_a63    6884  1348  1271160 28944 SyS_epoll_ b73712b5 S com.cpsc.livedemo:daemon_service

cat /proc/<進程id>/oom_adj

root@generic_x86:/ # cat /proc/6884/oom_adj                                    
1
root@generic_x86:/ # cat /proc/6884/oom_adj                                    
1
root@generic_x86:/ # 

參考作者鏈接