Android 听筒模式 实现
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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