电话录音机

在MainActivity中

public class MainActivity extends Activity {

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

    }

    public void click(View v){

        Intent intent = new Intent(this, RecorderService.class);

        startService(intent);

    }

    

}

 

在RecorderService 中

public class RecorderService extends Service {

    private MediaRecorder recorder;

    @Override

    public IBinder onBind(Intent intent) {

        // TODO Auto-generated method stub

        return null;

    }

    @Override

    public void onCreate() {

        super.onCreate();

        //获取电话管理器

        TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);

        //监听电话状态

        tm.listen(new MyListener(), PhoneStateListener.LISTEN_CALL_STATE);

    }

    

    class MyListener extends PhoneStateListener{

        

        //电话状态改变时回调

        @Override

        public void onCallStateChanged(int state, String incomingNumber) {

            super.onCallStateChanged(state, incomingNumber);

            //判断当前是什么状态

            switch (state) {

            case TelephonyManager.CALL_STATE_IDLE:

                if(recorder != null){

                    System.out.println("停止录音");

                    //停止录音

                    recorder.stop();

                    //释放录音机占用的资源

                    recorder.release();

                    recorder = null;

                }

                break;

            case TelephonyManager.CALL_STATE_RINGING:

                if(recorder == null){

                    recorder = new MediaRecorder();

                    //设置音频来源

                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);

                    //设置输出格式

                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);

                    recorder.setOutputFile("sdcard/voice.3gp");

                    //设置音频编码

                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

                    try {

                        System.out.println("准备好");

                        recorder.prepare();

                    } catch (IllegalStateException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                    } catch (IOException e) {

                        // TODO Auto-generated catch block

                        e.printStackTrace();

                    }

                    

                }

                break;

            case TelephonyManager.CALL_STATE_OFFHOOK:

                if(recorder != null){

                    System.out.println("开始录音");

                    recorder.start();

                }

                break;

            }

        }

        

    }

}

在清单文件中：

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

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

    package="com.itheima.recorder"

    android:versionCode="1"

    android:versionName="1.0" >

    <uses-sdk

        android:minSdkVersion="8"

        android:targetSdkVersion="17" />

    <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" />3

    <application

        android:allowBackup="true"

        android:icon="@drawable/ic_launcher"

        android:label="@string/app_name"

        android:theme="@style/AppTheme" >

        <activity

            android:name="com.itheima.recorder.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="com.itheima.recorder.RecorderService"></service>

    </application>

</manifest>