Android 听筒模式和扬声器模式切换的实现

http://www.2cto.com/kf/201312/263642.html

step 1，在AndroidManifest文件中添加权限声明

<uses-permission android:name= "android.permission.MODIFY_AUDIO_SETTINGS" ></uses-permission>

step 2:

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

}