Android service sample (2015.12.3)

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http://www.tutorialspoint.com/android/android_services.htm

1. 新建一个service文件：MyService.java

package com.example.helloworld;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.widget.Toast;public class MyService extends Service {   @Overridepublic IBinder onBind(Intent arg0){return null;}@Override public int onStartCommand(Intent intent, int flags, int startId) {Toast.makeText(this, "Service Started", Toast.LENGTH_LONG).show();return START_STICKY;}@Overridepublic void onDestroy() {super.onDestroy();Toast.makeText(this, "Service Destroyed", Toast.LENGTH_LONG).show();}}

2. 在Manifest.xml中声明：

 <service android:name=".MyService" />

3. 修改界面文件：增加2个buttong, 来启动和停止 service

    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/textView1"        android:layout_below="@+id/textView1"        android:layout_marginTop="68dp"        android:text="Start Service"         <span style="color:#ff0000;">android:onClick="startService" /></span>    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignLeft="@+id/button1"        android:layout_below="@+id/button1"        android:text="Stop Service"         <span style="color:#ff0000;">android:onClick="stopService"/></span>

Android Service Demo

4. 在界面xml中调用的两个函数：定义在MainActivity.java中

    //Method to start the service    public void startService(View view) {    startService(new Intent(getBaseContext(), MyService.class));    }        public void stopService(View view) {    stopService(new Intent(getBaseContext(), MyService.class));    }

编译，运行。

多体会下面的切换过程：

Android Service lifecycle

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