安卓开发service

如果把Activity比喻为前台程序，那么service可以看做是一个后台程序。Service跟Activity一样也由Intent调用。

在工程里想要添加一个Service，先新建继承Service的类，然后到AndroidManifest.xml -> Application

中的Service标签中添加。

如下：

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.example.service"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="21" />

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name=".MainActivity"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <service android:name=".MyService">

        <intent-filter>

                <action android:name="" />

        </intent-filter>

        </service>

    </application>

</manifest>

其中，第一个name是service的位置，包括完整的包名和service名，如果包名就是你定义的程序包名，也就是和gen目录下那个包的名字一样的话，直接".service名"就可以了。第二个name是你调用service时intent.setAction();中的参数，这个可以自己随便定义。

代码如下：

activity_main.xml:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

        android:orientation="vertical" android:layout_width="fill_parent"

        android:layout_height="fill_parent">

        <Button android:layout_width="wrap_content"

                android:layout_height="wrap_content" android:id="@+id/btnStartMyService"

                android:text="StartMyService">

        </Button>

        <Button android:layout_width="wrap_content"

                android:layout_height="wrap_content" android:id="@+id/btnStopMyService"

                android:text="StopMyService">

        </Button>

        <Button android:layout_width="wrap_content"

                android:layout_height="wrap_content" android:id="@+id/btnBindMyService"

                android:text="BindMyService">

        </Button>

        <Button android:layout_width="wrap_content"

                android:layout_height="wrap_content" android:id="@+id/btnUnbindMyService"

                android:text="UnbindMyService">

        </Button>

        <Button android:layout_width="wrap_content"

                android:layout_height="wrap_content" android:id="@+id/btnExit"

                android:text="退出程序">

        </Button>

</LinearLayout>

MyService.java:

package com.example.service;  

import android.app.Service;

import android.content.Intent;

import android.os.IBinder;

import android.util.Log;  

public class MyService extends Service {

        static public String ServiceState="";

        @Override

        public IBinder onBind(Intent arg0) {

                Log.e("Service", "onBind");

                ServiceState="onBind";

                return null;

        }

        @Override

        public boolean onUnbind(Intent intent){

                super.onUnbind(intent);

                Log.e("Service", "onUnbind");

                ServiceState="onUnbind";

                return false;  

        }

        @Override

        public void onCreate(){

                super.onCreate();

                Log.e("Service", "onCreate");

                ServiceState="onCreate";

        }

        @Override

        public void onDestroy(){

                super.onDestroy();

                Log.e("Service", "onDestroy");

                ServiceState="onDestroy";

        }

        @Override

        public void onStart(Intent intent,int startid){

                super.onStart(intent, startid);

                Log.e("Service", "onStart");

                ServiceState="onStart";

        }  

}

MainActivity.java:

package com.example.service;  

import android.app.Activity;

import android.app.Service;

import android.content.ComponentName;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.util.Log;

import android.view.View;

import android.widget.Button;  

public class MainActivity extends Activity {

    Button btnStartMyService,btnStopMyService,btnBindMyService,btnUnbindMyService,btnExit;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        btnStartMyService=(Button)this.findViewById(R.id.btnStartMyService);

        btnStartMyService.setOnClickListener(new ClickEvent());  

        btnStopMyService=(Button)this.findViewById(R.id.btnStopMyService);

        btnStopMyService.setOnClickListener(new ClickEvent());  

        btnBindMyService=(Button)this.findViewById(R.id.btnBindMyService);

        btnBindMyService.setOnClickListener(new ClickEvent());  

        btnUnbindMyService=(Button)this.findViewById(R.id.btnUnbindMyService);

        btnUnbindMyService.setOnClickListener(new ClickEvent());   

        btnExit=(Button)this.findViewById(R.id.btnExit);

        btnExit.setOnClickListener(new ClickEvent());

    }

    @Override

    public void onDestroy()

    {

            super.onDestroy();

            Log.e("Activity","onDestroy");

    }  

    private ServiceConnection _connection = new ServiceConnection() {

                @Override

                public void onServiceConnected(ComponentName arg0, IBinder arg1) {

                        // TODO Auto-generated method stub

                }  

                @Override

                public void onServiceDisconnected(ComponentName name) {

                        // TODO Auto-generated method stub

                }

    };

    class ClickEvent implements View.OnClickListener{  

                @Override

                public void onClick(View v) {

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

                        if(v==btnStartMyService){

                                MainActivity.this.startService(intent);

                        }

                        else if(v==btnStopMyService){

                                MainActivity.this.stopService(intent);

                        }

                        else if(v==btnBindMyService){

                                MainActivity.this.bindService(intent, _connection, Service.BIND_AUTO_CREATE);

                        }

                        else if(v==btnUnbindMyService){

                                if(MyService.ServiceState=="onBind")//Service绑定了之后才能解绑

                                        MainActivity.this.unbindService(_connection);

                        }

                        else if(v==btnExit)

                        {

                                MainActivity.this.finish();

                        }  

                }  

    }

}

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安卓开发service

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