android开发MediaPlayer用法demo

public class MainActivity extends Activity {

    Button       play, up, down;
    ToggleButton mute;
    AudioManager aManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // 获取系统的音频服务
        aManager = (AudioManager) getSystemService(Service.AUDIO_SERVICE);
        // 获取界面中3个按钮和一个ToggleButton控件
        play = (Button) findViewById(R.id.play);
        up = (Button) findViewById(R.id.up);
        down = (Button) findViewById(R.id.down);
        mute = (ToggleButton) findViewById(R.id.mute);
        // 为play按钮的单击事件绑定监听器
        play.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View source) {
                // 初始化MediaPlayer对象，准备播放音乐
                MediaPlayer mPlayer = MediaPlayer.create(MainActivity.this, R.raw.bomb);
                // 设置循环播放
                mPlayer.setLooping(true);
                // 开始播放
                mPlayer.start();
            }
        });

        up.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View source) {
                // 指定调节音乐的音频，增大音量，而且显示音量图形示意
                aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_RAISE,
                    AudioManager.FLAG_SHOW_UI);
            }
        });
        down.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View source) {
                // 指定调节音乐的音频，降低音量，而且显示音量图形示意
                aManager.adjustStreamVolume(AudioManager.STREAM_MUSIC, AudioManager.ADJUST_LOWER,
                    AudioManager.FLAG_SHOW_UI);
            }
        });
        mute.setOnCheckedChangeListener(new OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton source, boolean isChecked) {
                // 指定调节音乐的音频，根据isChecked确定是否需要静音
                aManager.setStreamMute(AudioManager.STREAM_MUSIC, isChecked);
            }
        });
    }

}

activity_main.xml：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical" >

    <Button
        android:id="@+id/play"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/play" />

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:gravity="center_horizontal"
        android:orientation="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:textOff="@string/mute"
            android:textOn="@string/normal" />
    </LinearLayout>

</LinearLayout>

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