Android 听筒模式实现

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发布时间：2013-12-11 11:03:12

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一、利用距离感应器监听听筒靠近耳朵事件

准确的说距离感应器并不能监听到你是否把手机靠近耳朵，也许是你用手挡在了距离感应器前面，但这不是我们关心的，我们关心的是当你的耳朵靠近听筒时，我们要捕获到这个事件

step 1，新建实现SensorEventListener接口的类并实现onSensorChanged(SensorEvent event)方法

public class MainActivity extends Activity implements SensorEventListener

step 2，得到距离感应器的实例

audioManager = (AudioManager) this				.getSystemService(Context.AUDIO_SERVICE);		mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);		mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);

step 3，在onSensorChanged方法中判断是否靠近听筒

	public void onSensorChanged(SensorEvent event) {		// TODO Auto-generated method stub		float range = event.values[0];		if (range == mSensor.getMaximumRange()) {			Toast.makeText(this, "正常模式", Toast.LENGTH_LONG).show();		} else {			Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();		}

二、根据距离感应器改变AudioManager播放模式

默认情况下，播放语音都是用外置喇叭或者耳机，我们需要编码实现播放的切换。

step 1，在AndroidManifest文件中添加权限声明

step 2，切换播放模式

	public void onSensorChanged(SensorEvent event) {		// TODO Auto-generated method stub		float range = event.values[0];		if (range == mSensor.getMaximumRange()) {			Toast.makeText(this, "正常模式", Toast.LENGTH_LONG).show();			 audioManager.setMode(AudioManager.MODE_NORMAL);		} else {			Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();			 audioManager.setMode(AudioManager.MODE_IN_CALL);		}

完整代码：

package com.markjoker.sensortest;import java.io.FileInputStream;import java.io.IOException;import android.hardware.Sensor;import android.hardware.SensorEvent;import android.hardware.SensorEventListener;import android.hardware.SensorManager;import android.media.AudioManager;import android.media.MediaPlayer;import android.os.Bundle;import android.app.Activity;import android.content.Context;import android.util.Log;import android.view.Menu;import android.widget.Toast;public class MainActivity extends Activity implements SensorEventListener {	private AudioManager audioManager;	private SensorManager mSensorManager;	private Sensor mSensor;	@Override	protected void onCreate(Bundle savedInstanceState) {		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_main);		init();	}	private void init() {		audioManager = (AudioManager) this				.getSystemService(Context.AUDIO_SERVICE);		mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);		mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);				MediaPlayer mPlayer = new MediaPlayer();		try {			mPlayer.reset();			mPlayer.setDataSource(new FileInputStream("/sdcard/snow.mp3").getFD());			mPlayer.prepare();			mPlayer.start();		} catch (IllegalArgumentException e) {			// TODO Auto-generated catch block			e.printStackTrace();		} catch (SecurityException 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();		}	}	@Override	protected void onResume() {		mSensorManager.registerListener(this, mSensor,				SensorManager.SENSOR_DELAY_NORMAL);		super.onResume();	}	@Override	protected void onPause() {		// TODO Auto-generated method stub		mSensorManager.unregisterListener(this);		super.onPause();	}	@Override	public void onSensorChanged(SensorEvent event) {		// TODO Auto-generated method stub		float range = event.values[0];		if (range == mSensor.getMaximumRange()) {			Toast.makeText(this, "正常模式", Toast.LENGTH_LONG).show();			 audioManager.setMode(AudioManager.MODE_NORMAL);		} else {			Toast.makeText(this, "听筒模式", Toast.LENGTH_LONG).show();			 audioManager.setMode(AudioManager.MODE_IN_CALL);		}	}	@Override	public void onAccuracyChanged(Sensor sensor, int accuracy) {		// TODO Auto-generated method stub	}}

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