我的安卓记录二（service）

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service在后台运行
生命周期：onCreate()–>onStart()–>onDestroy()
这里写图片描述

1、新建一个service类

package com.example.wlb.launchlocalapp;import android.app.Service;import android.content.Intent;import android.os.Binder;import android.os.IBinder;public class MyService extends Service {    public MyService() {    }    private boolean serviceRunning = false;    @Override    public IBinder onBind(Intent intent) {        return new Binder();    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        System.out.println("Service onCommand.");        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onCreate() {        super.onCreate();        System.out.println("Service onCreate.");        serviceRunning = true;        new Thread(){            @Override            public void run() {                super.run();                while (serviceRunning) {                    System.out.println("Service is running...");                    try {                        sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        }.start();    }    @Override    public void onDestroy() {        super.onDestroy();        System.out.println("Service onDestory.");        serviceRunning = false;    }}

2、启动/停止Service

Intent intent = new Intent(MainActivity.this,MyService.class);.....startService(intent)stopService(intent)

3、onCreate()用于启动Service

public void onCreate() {        super.onCreate();        System.out.println("Service onCreate.");        serviceRunning = true;        new Thread(){            @Override            public void run() {                super.run();                while (serviceRunning) {                    System.out.println("Service is running...");                    try {                        sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        }.start();    }

4、onDestroy()用于停止Service

public void onDestroy() {        super.onDestroy();        System.out.println("Service onDestory.");        serviceRunning = false;    }

5、onStartCommand在Service中传数据
（1）创建editText用于输入数据

 public void onClick(View v) {        switch (v.getId()){            case R.id.btnStartService:                intent.putExtra("data",editText.getText().toString());                startService(intent);                break;            case R.id.btnStoptService:                stopService(intent);                break;            case R.id.btnBindtService:                bindService(intent, this, Context.BIND_AUTO_CREATE);                break;            case R.id.btnUnbindtService:                unbindService(this);                break;        }    }

（2）通过intent传递数据

  @Override    public int onStartCommand(Intent intent, int flags, int startId) {        System.out.println("Service onCommand.");        data = intent.getStringExtra("data");        return super.onStartCommand(intent, flags, startId);    }    @Override    public void onCreate() {        super.onCreate();        System.out.println("Service onCreate.");        serviceRunning = true;        new Thread(){            @Override            public void run() {                super.run();                while (serviceRunning) {                    System.out.println(data);                    try {                        sleep(1000);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }            }        }.start();    }    @Override    public void onDestroy() {        super.onDestroy();        System.out.println("Service onDestory.");        serviceRunning = false;

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