使用AudioManager控制手机音频

/AudioTest/src/com/lxm/audiotest/MainActivity.java

package com.lxm.audiotest;

import android.app.Activity;
import android.app.Service;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.CompoundButton.OnCheckedChangeListener;
import android.widget.ToggleButton;

public class MainActivity extends Activity {
Button play, up, down;
AudioManager aManager;
ToggleButton mute;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
play = (Button) findViewById(R.id.play);

up = (Button) findViewById(R.id.up);
down = (Button) findViewById(R.id.down);
aManager = (AudioManager) getSystemService(
Service.AUDIO_SERVICE);
mute = (ToggleButton) findViewById(R.id.mute);
play.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {

MediaPlayer mPlayer = MediaPlayer.create(
MainActivity.this, R.raw.earth);
mPlayer.setLooping(true);
mPlayer.start();
}});
up.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_RAISE, AudioManager.FLAG_SHOW_UI);
}});
down.setOnClickListener(new OnClickListener(){

@Override
public void onClick(View v) {
aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC,
AudioManager.ADJUST_LOWER, AudioManager.FLAG_SHOW_UI);
}});
mute.setOnCheckedChangeListener(new OnCheckedChangeListener(){

@Override
public void onCheckedChanged(CompoundButton buttonView,
boolean isChecked) {
aManager.setStreamMute(AudioManager.STREAM_MUSIC,
isChecked);
}});
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}

}

/AudioTest/res/layout/activity_main.xml

<pre name="code" class="html"><?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal"
>
<Button
android:id="@+id/play"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/play"
/>
<LinearLayout
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:gravity="center_horizontal"
>
<Button
android:id="@+id/up"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/up"
/>
<Button
android:id="@+id/down"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/down"
/>
<ToggleButton
android:id="@+id/mute"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textOn="@string/normal"
android:textOff="@string/mute"
/>
</LinearLayout>
</LinearLayout>

源码下载

以上的资料都来自于李刚老师的疯狂android讲义。