android service 样例（电话录音和获取系统当前时间）

关于android service 的具体解释请參考： android四大组件--android service具体解释。以下将用两个实例具体呈现Android Service的两种实现。

一个是startService()方法来启动一个服务，这里用电话录音的样例。

还有一个是bindService()方法来绑定一个服务，这里用获取系统当前时间的样例；

实例一（电话录音）：

/CallRecorderService/res/layout/main.xml

<?

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/tvTemp"

        android:layout_width="fill_parent"

        android:layout_height="100dip"

        android:gravity="center"

        android:text="@string/hello"

        android:textSize="30dip" />

    <Button

        android:id="@+id/startrecordservice"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="开启电话录音的功能" />

</LinearLayout>

/CallRecorderService/AndroidManifest.xml

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

>

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

    package="com.zymic.callrecord"

    android:versionCode="1"

    android:versionName="1.0" >

    <application

        android:icon="@drawable/icon"

        android:label="@string/app_name" >

        <activity

            android:name=".CallRecord01"

            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="CallRecordService"

            android:enabled="true" >

        </service>

    </application>

    <uses-sdk android:minSdkVersion="7" />

    <uses-permission android:name="android.permission.READ_PHONE_STATE" >

    </uses-permission>

    <uses-permission android:name="android.permission.RECORD_AUDIO" >

    </uses-permission>

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" >

    </uses-permission>

</manifest>

以下将是三个核心的实现

/CallRecorderService/src/com/bing/callrecord/CallRecordService.java

package com.bing.callrecord;

import java.io.File;

import java.io.IOException;

import android.app.Service;

import android.content.Context;

import android.content.Intent;

import android.media.MediaRecorder;

import android.os.IBinder;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.widget.Toast;

public class CallRecordService extends Service {

	@Override

	public IBinder onBind(Intent intent) {

		// TODO Auto-generated method stub

		return null;

	}

	@Override

	public void onCreate() {

		super.onCreate();

		Toast.makeText(getApplicationContext(), "录音服务已经创建!", Toast.LENGTH_LONG).show();

	}

	@Override

	public void onDestroy() {

		super.onDestroy();

		Toast.makeText(getApplicationContext(), "录音服务已经销毁!", Toast.LENGTH_LONG).show();

	}

	@Override

	public void onStart(Intent intent, int startId) {

		super.onStart(intent, startId);

		Toast.makeText(getApplicationContext(), "录音服务已经启动!", Toast.LENGTH_LONG).show();

		//

		TelephonyManager telephonymanager=(TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

		telephonymanager.listen(new PhoneListener(getApplicationContext()), PhoneStateListener.LISTEN_CALL_STATE);

	}

}

/CallRecorderService/src/com/bing/callrecord/PhoneListener.java

package com.bing.callrecord;

import java.io.File;

import java.io.IOException;

import android.content.Context;

import android.media.MediaRecorder;

import android.telephony.PhoneStateListener;

import android.telephony.TelephonyManager;

import android.widget.Toast;

public class PhoneListener extends PhoneStateListener {

	File audioFile;

	MediaRecorder mediaRecorder; //= new MediaRecorder();

	Context c;

	//

	boolean iscall=false;

	//

	public PhoneListener(Context context){

		c=context;

		iscall=false;

	}

	@Override

	public void onCallStateChanged(int state, String incomingNumber) {

		super.onCallStateChanged(state, incomingNumber);

		mediaRecorder = new MediaRecorder();

		switch(state){

		case TelephonyManager.CALL_STATE_OFFHOOK:

			iscall=true;

			try {

				recordCallComment();

			} catch (IOException e) {

				// TODO Auto-generated catch block

				e.printStackTrace();

				mediaRecorder.stop();

			}

			Toast.makeText(c, "正在录音", Toast.LENGTH_SHORT).show();

			break;

		case TelephonyManager.CALL_STATE_IDLE:

			//if(mediaRecorder!=null){

				//mediaRecorder.stop();

				//mediaRecorder=null;

			//}

			if(iscall){

				mediaRecorder.stop();

				iscall=false;

			}

			break;

		}

	}

	//

	public void recordCallComment() throws IOException{

		System.out.println(mediaRecorder);

		mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);

		mediaRecorder

				.setOutputFormat(MediaRecorder.OutputFormat.DEFAULT);

		mediaRecorder

				.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);

		audioFile = File.createTempFile("record_", ".amr");

		mediaRecorder.setOutputFile(audioFile.getAbsolutePath());

		mediaRecorder.prepare();

		mediaRecorder.start();

	}

}

/CallRecorderService/src/com/bing/callrecord/CallRecorder.java

package com.bing.callrecord;

import com.zymic.callrecord.R;

import android.app.Activity;

import android.content.Intent;

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class CallRecorder extends Activity {

    private Button beginrecordservice;

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

        //

        beginrecordservice=(Button)findViewById(R.id.startrecordservice);

        beginrecordservice.setOnClickListener(new BeginRecord());

    }

    //

    private class BeginRecord implements OnClickListener{

		@Override

		public void onClick(View v) {

			Intent serviceIntent=new Intent(getApplicationContext(),CallRecordService.class);

			getApplicationContext().startService(serviceIntent);

		}

    }

}

最后效果图例如以下：

watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvdTAxMTA2NzM2MA==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast" alt="" />

实例二（获取当前时间）：

界面代码实现：

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

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

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:gravity="center"

    android:orientation="vertical" >

    <TextView

        android:id="@+id/tvTemp"

        android:layout_width="fill_parent"

        android:layout_height="100dip"

        android:gravity="center"

        android:textSize="30dip"

        android:text="@string/hello" />

    <Button

        android:id="@+id/btnStart"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/btnBind_name" />

    <Button

        android:id="@+id/btnStop"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="@string/btnUnbind_name" />

    <TextView

        android:id="@+id/tvInfo"

        android:layout_width="fill_parent"

        android:layout_height="100dip" />

</LinearLayout>

在Manifest里面声明服务,加入MyService声明.

<?

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

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

    package="com.gel.service"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk android:minSdkVersion="10" />

    <application

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name" >

        <activity

            android:label="@string/app_name"

            android:name=".MainActivity" >

            <intent-filter >

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

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

            </intent-filter>

        </activity>

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

    </application>

</manifest>

加入一个MyService类.代码例如以下：

package com.gel.service;

import android.app.Activity;

import android.content.ComponentName;

import android.content.Context;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.Bundle;

import android.os.IBinder;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.TextView;

public class MainActivity extends Activity implements OnClickListener {

	private MyService mMyService;

	private TextView mTextView;

	private Button bindServiceButton;

	private Button unbindServiceButton;

	private Context mContext;

	@Override

	public void onCreate(Bundle savedInstanceState) {

		super.onCreate(savedInstanceState);

		setContentView(R.layout.main);

		setupViews();

	}

	private ServiceConnection mServiceConnection = new ServiceConnection() {

		// 当我bindService时，让TextView显示MyService里getSystemTime()方法的返回值

		public void onServiceConnected(ComponentName name, IBinder service) {

			// TODO Auto-generated method stub

			mMyService = ((MyService.MyBinder) service).getService();

			mTextView.setText("来自MyService的系统时间:"

					+ mMyService.getSystemTime());

		}

		public void onServiceDisconnected(ComponentName name) {

			// TODO Auto-generated method stub

		}

	};

	public void setupViews() {

		mContext = MainActivity.this;

		mTextView = (TextView)findViewById(R.id.tvInfo);

		bindServiceButton = (Button) findViewById(R.id.btnStart);

		unbindServiceButton = (Button) findViewById(R.id.btnStop);

		bindServiceButton.setOnClickListener(this);

		unbindServiceButton.setOnClickListener(this);

	}

	public void onClick(View v) {

		// TODO Auto-generated method stub

		if (v == bindServiceButton) {

			Intent i = new Intent();

			i.setClass(MainActivity.this, MyService.class);

			mContext.bindService(i, mServiceConnection, BIND_AUTO_CREATE);

		} else {

			mContext.unbindService(mServiceConnection);

		}

	}

}

创建Bound Service，MyService代码:

 

package com.gel.service;

import android.app.Service;

import android.content.Intent;

import android.os.Binder;

import android.os.IBinder;

import android.text.format.Time;

import android.util.Log;

public class MyService extends Service {

	// 定义个一个Tag标签

	private static final String TAG = "MyService";

	// 这里定义一个Binder类，用在onBind()有方法里。这样Activity那边能够获取到

	private MyBinder mBinder = new MyBinder();

	@Override

	public IBinder onBind(Intent intent) {

		Log.e(TAG, "Start IBinder!");

		return mBinder;

	}

	@Override

	public void onCreate() {

		Log.e(TAG, "Start onCreate!");

		super.onCreate();

	}

	@Override

	public void onStart(Intent intent, int startId) {

		Log.e(TAG, "Start onStart!");

		super.onStart(intent, startId);

	}

	@Override

	public void onDestroy() {

		Log.e(TAG, "Start onDestroy!");

		super.onDestroy();

	}

	@Override

	public boolean onUnbind(Intent intent) {

		Log.e(TAG, "Start onUnbind!");

		return super.onUnbind(intent);

	}

	// 这里我写了一个获取当前时间的函数，

	public String getSystemTime() {

		Time t = new Time();

		t.setToNow();

		return t.toString();

	}

	public class MyBinder extends Binder {

		MyService getService() {

			return MyService.this;

		}

	}

}

最后的效果例如以下：

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