android service 自重启 android service启动方式及生命周期

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mob64ca1401464d 2023-08-31 19:02:47

文章标签 android service 自重启 android ide 自动启动 文章分类 Android 移动开发

一.Service的简介
1.Service介绍和作用
Service是Android系统中的四大组件之一，它是一种长生命周期的，没有可视化界面，运行于后台的一种服务程序。比如我们播放音乐的时候，有可能想边听音乐边干些其他事情，当退出播放音乐的应用，如果不用Service，我们就听不到歌了，所以这时候就得用到Service了。

2、Service的俩种启动方式
1、通过Context.startService（intent）方法启动服务，这种方式启动服务，服务会一直在后台执行，除非用户在设置中把Service关闭，或者调用了StopService（intent）方法；多次执行启动服务的方法只会执行onCreate方法一次。会每次都执行onStartCommend()方法，根据此方法的返回值决定服务被杀死后是否自动启动。如下

START_STICKY 粘性的被杀死会自动启动但是无Intent
START_REDELIVER_INTENT 粘性的会自动启动，传递intent
START_NOT_STICKY 非粘性的不会自动启动
调用父类的Super.OnStartCommand()是粘性无intent

生命周期执行的方法
onCreate()
onStartCommand()
Service running
onDestroy()方法

2、绑定方式启动服务（Context.bindService()/unBindService()）
此方式启动服务，服务的生命周期与调用的客户端组件的生命周期有关，执行的方法如下
1、onCreate
2、onBind
Service running 如果绑定者被销毁，服务也会解绑，并执行断开连接的方法
3、onUnBind()（如果还有组件绑定着）则服务继续执行没有绑定者了
4、onDestroy()

3、混合时启动startService()—bindSevice()—–unBindService —stopService()

onCreate()—onStartCommand()–服务运行 -onBind() –onUnbind()—调用Stop—onDestroy();

代码如下
1、MyService类

package com.kuxiao.testservice;

import java.util.Random;

import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;

public class MyService extends Service {

    // START_STICKY 粘性的 被杀死会自动启动 但是无Intent
    // START_REDELIVER_INTENT 粘性的 会自动启动， 传递intent
    // START_NOT_STICKY 非粘性的 不会自动启动
    // 调用父类的Super.OnStartCommand()是粘性 无intent

    @Override
    public void onCreate() {

        Log.d("MyService  --->>", "MyService服务创建了...");

        super.onCreate();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        if (intent != null) {
            String from = intent.getStringExtra("from");
            Log.d("MyService  --->>", "onStartCommand的方法...from:" + from);
        }

        return START_STICKY;
    }

    private MyBinder mMyBinder = new MyBinder();

    private Random mMyRandom = new Random();

    @Override
    public boolean onUnbind(Intent intent) {
        Log.d("MyService  --->>", "unbindService方法....");
        return super.onUnbind(intent);
    }

    @Override
    public IBinder onBind(Intent intent) {

        if (intent != null) {
            String from = intent.getStringExtra("from");
            Log.d("MyService  --->>", "onBind方法....form :" + from);
        }
        return mMyBinder;
    }

    class MyBinder extends Binder {

        public MyService getService() {
            return MyService.this;
        }

    }

    @Override
    public void onDestroy() {
        Log.d("MyService  --->>", "MyService服务销毁了...。。。");
        super.onDestroy();
    }

    public int getRandomCount() {
        return mMyRandom.nextInt(1000);
    }

}

2、MainActivity类

package com.kuxiao.testservice;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.kuxiao.testservice.MyService.MyBinder;

public class MainActivity extends ActionBarActivity implements OnClickListener {

    private Button mBtn_startService;
    private Button mBtn_stopService;
    private Button mBtn_bindService;
    private Button mBtn_unbindService;
    private Button mBtn_startActivity;

    private MyService mMyService = null;
    private boolean isBind = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
    }

    private ServiceConnection conn = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            isBind = true;
            MyBinder myBinder = (MyBinder) service;
            Log.d("MainActivity  --->>", "MainActivity绑定service....");
            mMyService = myBinder.getService();
            mMyService.getRandomCount();
            Log.d("MainActivity  --->>",
                    "绑定service获取到的随机数为...." + mMyService.getRandomCount());
        }
    };

    private void initView() {
        mBtn_startService = (Button) findViewById(R.id.id_btn_startservice);
        mBtn_stopService = (Button) findViewById(R.id.id_btn_stopservice);
        mBtn_bindService = (Button) findViewById(R.id.id_btn_bindService);
        mBtn_unbindService = (Button) findViewById(R.id.id_btn_unbindservice);
        mBtn_startActivity = (Button) findViewById(R.id.id_btn_startAcitityB);
        mBtn_startService.setOnClickListener(this);
        mBtn_bindService.setOnClickListener(this);
        mBtn_unbindService.setOnClickListener(this);
        mBtn_startActivity.setOnClickListener(this);
        mBtn_stopService.setOnClickListener(this);
        Log.d("MainActivity  --->>", "MainActivity创建了...OnCreate....");
    }

    @Override
    protected void onStart() {
        Log.d("MainActivity  --->>", "MainActivity开始了...onStart....");
        super.onStart();
    }

    @Override
    protected void onResume() {
        Log.d("MainActivity  --->>", "MainActivity可交互了...onResume....");
        super.onResume();
    }

    @Override
    protected void onPause() {
        Log.d("MainActivity  --->>", "MainActivity可暂停了...onPause....");
        super.onPause();
    }

    @Override
    protected void onRestart() {
        Log.d("MainActivity  --->>", "MainActivity重新开始了...onRestart....");
        super.onRestart();
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
        case R.id.id_btn_startservice:
            Intent intent = new Intent(this, MyService.class);
            intent.putExtra("from", this.getClass().getSimpleName());
            startService(intent);
            break;
        case R.id.id_btn_stopservice:
            Intent intent1 = new Intent(this, MyService.class);
            intent1.putExtra("from", this.getClass().getSimpleName());
            stopService(intent1);
            break;
        case R.id.id_btn_bindService:

            Intent intent2 = new Intent(this, MyService.class);
            intent2.putExtra("from", this.getClass().getSimpleName());
            bindService(intent2, conn, BIND_AUTO_CREATE);

            break;
        case R.id.id_btn_unbindservice:

            if (isBind) {
                isBind = false;
                unbindService(conn);
                Log.d("MainActivity  --->>", "MainActivity解除绑定service....");
            }

            break;
        case R.id.id_btn_startAcitityB:
            Intent intent3 = new Intent(this, MainActivity1.class);
            startActivity(intent3);
            break;
        }

    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
}

3、MainActivity1类

package com.kuxiao.testservice;

import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.support.v7.app.ActionBarActivity;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.kuxiao.testservice.MyService.MyBinder;

public class MainActivity1 extends ActionBarActivity implements OnClickListener {

    private Button mBtn_bindService;
    private Button mBtn_unbindService;
    private Button mBtn_startActivity;

    private MyService mMyService = null;
    private boolean isBind = false;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main1);
        initView();
    }

    private ServiceConnection conn = new ServiceConnection() {

        @Override
        public void onServiceDisconnected(ComponentName name) {

        }

        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            isBind = true;
            MyBinder myBinder = (MyBinder) service;
            Log.d("MainActivity1  --->>", "MainActivity 1绑定service....");
            mMyService = myBinder.getService();
            mMyService.getRandomCount();
            Log.d("MainActivity1  --->>",
                    "绑定service获取到的随机数为...." + mMyService.getRandomCount());
        }
    };

    private void initView() {

        mBtn_bindService = (Button) findViewById(R.id.id_btn_bindService1);
        mBtn_unbindService = (Button) findViewById(R.id.id_btn_unbindservice1);
        mBtn_startActivity = (Button) findViewById(R.id.id_btn_finish);

        mBtn_bindService.setOnClickListener(this);
        mBtn_unbindService.setOnClickListener(this);
        mBtn_startActivity.setOnClickListener(this);

        Log.d("MainActivity1  --->>", "MainActivity1创建了...OnCreate....");
    }

    @Override
    protected void onStart() {
        Log.d("MainActivity1  --->>", "MainActivity1开始了...onStart....");
        super.onStart();
    }

    @Override
    protected void onResume() {
        Log.d("MainActivity1  --->>", "MainActivity1可交互了...onResume....");
        super.onResume();
    }

    @Override
    protected void onPause() {
        Log.d("MainActivity1  --->>", "MainActivity1可暂停了...onPause....");
        super.onPause();
    }

    @Override
    protected void onRestart() {
        Log.d("MainActivity1  --->>", "MainActivity1重新开始了...onRestart....");
        super.onRestart();
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {

        case R.id.id_btn_bindService1:
            Intent intent2 = new Intent(this, MyService.class);
            intent2.putExtra("from", this.getClass().getSimpleName());
            bindService(intent2, conn, BIND_AUTO_CREATE);

            break;
        case R.id.id_btn_unbindservice1:

            if (isBind) {
                isBind = false;
                unbindService(conn);
                Log.d("MainActivity1  --->>", "MainActivity1解除绑定service....");
            }

            break;
        case R.id.id_btn_finish:
            finish();
            break;
        }

    }

    @Override
    protected void onDestroy() {

        super.onDestroy();
    }
}

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