android服务之录音功能

布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
android:id="@+id/start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="18sp"
android:text="开始录音"
android:onClick="click"/>
</LinearLayout>

Activity

package xidian.dy.com.chujia;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
Intent service;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

}

public void click(View v){
Toast.makeText(this,"开启服务",Toast.LENGTH_SHORT).show();
service = new Intent(this, MyService.class);
startService(service);
}

}

服务

package xidian.dy.com.chujia;

import android.app.Service;
import android.content.Intent;
import android.media.MediaRecorder;
import android.os.Environment;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.util.Log;

import java.io.IOException;

/**
* Created by dy on 2016/7/12.
*/
public class MyService extends Service {
TelephonyManager tm;
@Override
public void onCreate() {
super.onCreate();
//获取电话管理器
tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);
//对感兴趣的事件进行监听,传入回调函数
tm.listen(new MyListener(),PhoneStateListener.LISTEN_CALL_STATE);
}

class MyListener extends PhoneStateListener{
MediaRecorder mRecorder;
//一旦电话状态改变该方法被调用
@Override
public void onCallStateChanged(int state, String incomingNumber) {
super.onCallStateChanged(state, incomingNumber);
switch (state){
//电话处于空闲状态停止录音
case TelephonyManager.CALL_STATE_IDLE:
if(mRecorder != null){
mRecorder.stop();
mRecorder.release();
mRecorder = null;
}
break;
//电话处于响铃状态
case TelephonyManager.CALL_STATE_RINGING:
mRecorder = new MediaRecorder();
mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
mRecorder.setOutputFile(Environment.getExternalStorageDirectory().toString() + "/record.3gp");
mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
try {
mRecorder.prepare();
} catch (IOException e) {
Log.e(this.getClass().getName(), "prepare() failed");
}
break;
//电话处于摘机状态
case TelephonyManager.CALL_STATE_OFFHOOK:
if(mRecorder != null){
mRecorder.start();
}
break;
}
}
}

@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
}

清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="xidian.dy.com.chujia">
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.RECORD_AUDIO" />

<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme">
<activity
android:name=".MainActivity"
android:label="主界面">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyService" />
</application>
</manifest>