Android听筒模式的具体实现实例
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
step1,新建实现SensorEventListener接口的类并实现onSensorChanged(SensorEventevent)方法
publicclassMainActivityextendsActivityimplementsSensorEventListener
step2,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);
step3,在onSensorChanged方法中判断是否靠近听筒
publicvoidonSensorChanged(SensorEventevent){
//TODOAuto-generatedmethodstub
floatrange=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();
}
step4,向SensorManager注册监听距离感应器
@Override
protectedvoidonResume(){
mSensorManager.registerListener(this,mSensor,
SensorManager.SENSOR_DELAY_NORMAL);
super.onResume();
}
@Override
protectedvoidonPause(){
mSensorManager.unregisterListener(this);
super.onPause();
}
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。
step1,在AndroidManifest文件中添加权限声明
<uses-permissionandroid:name="android.permission.MODIFY_AUDIO_SETTINGS"/>
step2,切换播放模式
publicvoidonSensorChanged(SensorEventevent){
//TODOAuto-generatedmethodstub
floatrange=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:
importjava.io.FileInputStream; importandroid.hardware.Sensor; publicclassMainActivityextendsActivityimplementsSensorEventListener{ @Override privatevoidinit(){ @Override @Override @Override if(range==mSensor.getMaximumRange()){ @Override } }
packagecom.markjoker.sensortest;
importjava.io.IOException;
importandroid.hardware.SensorEvent;
importandroid.hardware.SensorEventListener;
importandroid.hardware.SensorManager;
importandroid.media.AudioManager;
importandroid.media.MediaPlayer;
importandroid.os.Bundle;
importandroid.app.Activity;
importandroid.content.Context;
importandroid.util.Log;
importandroid.view.Menu;
importandroid.widget.Toast;
privateAudioManageraudioManager;
privateSensorManagermSensorManager;
privateSensormSensor;
protectedvoidonCreate(BundlesavedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
audioManager=(AudioManager)this
.getSystemService(Context.AUDIO_SERVICE);
mSensorManager=(SensorManager)getSystemService(Context.SENSOR_SERVICE);
mSensor=mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
MediaPlayermPlayer=newMediaPlayer();
try{
mPlayer.reset();
mPlayer.setDataSource(newFileInputStream("/sdcard/snow.mp3").getFD());
mPlayer.prepare();
mPlayer.start();
}catch(IllegalArgumentExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(SecurityExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IllegalStateExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}catch(IOExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
}
protectedvoidonResume(){
mSensorManager.registerListener(this,mSensor,
SensorManager.SENSOR_DELAY_NORMAL);
super.onResume();
}
protectedvoidonPause(){
//TODOAuto-generatedmethodstub
mSensorManager.unregisterListener(this);
super.onPause();
}
publicvoidonSensorChanged(SensorEventevent){
//TODOAuto-generatedmethodstub
floatrange=event.values[0];
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);
}
}
publicvoidonAccuracyChanged(Sensorsensor,intaccuracy){
//TODOAuto-generatedmethodstub相关文章