利用手机距离感应器来切换扬声器和听筒播放

来源：互联网发布：振动分析软件编辑：程序博客网时间：2024/04/30 11:54

主页面代码

public class MainActivity extends AppCompatActivity implements View.OnClickListener,        SensorEventListener {// 这里实现传感器监听    Button btn_start = null;    Button btn_stop = null;    Button btn_close = null;    Button btn_open = null;    MediaPlayer _mediaPlayer = null; // 音乐播放管理器    AudioManager audioManager = null; // 声音管理器    SensorManager _sensorManager = null; // 传感器管理器    Sensor mProximiny = null; // 传感器实例    float f_proximiny; // 当前传感器距离    //屏幕开关    private PowerManager localPowerManager = null;//电源管理对象    private PowerManager.WakeLock localWakeLock = null;//电源锁    private boolean isFirstSetSpeaker = true;    private String musicPath = Environment.getExternalStorageDirectory() + "/lingchat/files/" + "1.mp3";    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn_start = (Button) findViewById(R.id.btn_start);        btn_start.setOnClickListener(this);        btn_stop = (Button) findViewById(R.id.btn_stop);        btn_stop.setOnClickListener(this);        btn_close = (Button) findViewById(R.id.btn_close);        btn_close.setOnClickListener(this);        btn_open = (Button) findViewById(R.id.btn_open);        btn_open.setOnClickListener(this);        init();    }    @Override    protected void onResume() {        // TODO Auto-generated method stub        super.onResume();        // 注册传感器        _sensorManager.registerListener(this, mProximiny,                SensorManager.SENSOR_DELAY_NORMAL);    }    @Override    protected void onPause() {        // TODO Auto-generated method stub        super.onPause();        // 取消注册传感器        _sensorManager.unregisterListener(this);    }    private void playerMusic(String path, AudioOutputType type) {        // 重置播放器        _mediaPlayer.reset();        try {            // 设置播放路径            _mediaPlayer.setDataSource(path);            //这里是重点注意的地方，必须要设置，并且要在_mediaPlayer.prepare()之前设置            if(type == AudioOutputType.EARPIECE){                _mediaPlayer.setAudioStreamType(AudioManager.STREAM_VOICE_CALL);            }else{                _mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);            }            // 准备播放            _mediaPlayer.prepare();            // 开始播放            _mediaPlayer.start();        } catch (IllegalArgumentException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IllegalStateException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        }    }    private void stopPlayerMusic() {        // 停止播放        if (_mediaPlayer.isPlaying()) {            _mediaPlayer.reset();        }    }    /*     * (non-Javadoc)     *     * @see android.view.View.OnClickListener#onClick(android.view.View)     */    @Override    public void onClick(View v) {        // TODO Auto-generated method stub        switch (v.getId()) {            case R.id.btn_close:                setSpeakerphoneOn(false);                playerMusic(musicPath, AudioOutputType.SPEAKER);                break;            case R.id.btn_open:                setSpeakerphoneOn(true);                playerMusic(musicPath, AudioOutputType.EARPIECE);                break;            case R.id.btn_start:// 音乐取自于Sd卡上的音乐                playerMusic(musicPath, AudioOutputType.SPEAKER);                break;            case R.id.btn_stop:                stopPlayerMusic();                break;        }    }    /*     * 实现SensorEventListener需要实现的两个方法。     */    @Override    public void onSensorChanged(SensorEvent event) {        float[] its = event.values;        //Log.d(TAG,"its array:"+its+"sensor type :"+event.sensor.getType()+" proximity type:"+Sensor.TYPE_PROXIMITY);        if (its != null && event.sensor.getType() == Sensor.TYPE_PROXIMITY) {            System.out.println("its[0]:" + its[0]);            //经过测试，当手贴近距离感应器的时候its[0]返回值为0.0，当手离开时返回1.0            if (its[0] == 0.0) {// 贴近手机                setSpeakerphoneOn(false);                playerMusic(musicPath, AudioOutputType.EARPIECE);                if (localWakeLock.isHeld()) {                    return;                } else{                    localWakeLock.acquire();// 申请设备电源锁                }            } else {// 远离手机                if(isFirstSetSpeaker){                    isFirstSetSpeaker = false;                    localWakeLock.acquire();// 申请设备电源锁                }else{                    setSpeakerphoneOn(true);                    playerMusic(musicPath, AudioOutputType.SPEAKER);                    if (localWakeLock.isHeld()) {                        return;                    } else{                        localWakeLock.setReferenceCounted(false);                        localWakeLock.release(); // 释放设备电源锁                    }                }            }        }    }    /*     */    @Override    public void onAccuracyChanged(Sensor sensor, int accuracy) {        // TODO Auto-generated method stub    }    /**     * 初始化     */    private void init() {        _mediaPlayer = new MediaPlayer();        audioManager = (AudioManager) getSystemService(Context.AUDIO_SERVICE);        _sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);        mProximiny = _sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);        //获取系统服务POWER_SERVICE，返回一个PowerManager对象        localPowerManager = (PowerManager) getSystemService(Context.POWER_SERVICE);        //获取PowerManager.WakeLock对象,后面的参数|表示同时传入两个值,最后的是LogCat里用的Tag        localWakeLock = this.localPowerManager.newWakeLock(32, "MyPower");//第一个参数为电源锁级别，第二个是日志tag    }    @Override    protected void onDestroy() {        super.onDestroy();        onDestroyManager();    }    /**     * 退出注销     */    public void onDestroyManager() {        if(_sensorManager != null){            if(localWakeLock.isHeld())                localWakeLock.release();//释放电源锁，如果不释放finish这个acitivity后仍然会有自动锁屏的效果，不信可以试一试            localWakeLock = null;        }    }    /**     * 切换麦克风和话筒     * @param on     */    private synchronized void setSpeakerphoneOn(boolean on) {        if(on) {            audioManager.setSpeakerphoneOn(true);            audioManager.setMode(AudioManager.MODE_NORMAL);        } else {            setVolumeControlStream(AudioManager.STREAM_VOICE_CALL);            audioManager.setSpeakerphoneOn(false);//关闭扬声器            audioManager.setRouting(AudioManager.MODE_NORMAL, AudioManager.ROUTE_EARPIECE, AudioManager.ROUTE_ALL);            //       把声音设定成Earpiece（听筒）出来，设定为正在通话中            audioManager.setMode(AudioManager.MODE_IN_CALL);        }    }    private enum AudioOutputType{        EARPIECE,        SPEAKER,    }}

布局文件activity_main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    android:orientation="vertical"    tools:context=".SensorTestActivity" >    <LinearLayout        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:orientation="horizontal" >        <Button            android:id="@+id/btn_start"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="播放音乐" />        <Button            android:id="@+id/btn_stop"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="停止播放" />        <Button            android:id="@+id/btn_open"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="扬声器播放" />        <Button            android:id="@+id/btn_close"            android:layout_width="fill_parent"            android:layout_height="wrap_content"            android:layout_weight="1"            android:text="听筒播放" />    </LinearLayout></LinearLayout>

清单文件AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.yin_zeping.myearpiceapplication">    <uses-permission android:name="android.permission.RECORD_AUDIO" />    <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />    <!-- 允许使用PowerManager的 WakeLocks保持进程在休眠时从屏幕消失 -->    <uses-permission android:name="android.permission.WAKE_LOCK" />    <!-- 向SDCard写入数据权限 -->    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />    <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">            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>    </application></manifest>参考文章（请大家尊重他人劳动果实）http://blog.csdn.net/kazeik/article/details/8630111

demo下载

https://github.com/yinzeping/EarpieceSwitchSpeaker

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