设置音量
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public class Main extends Activity {MediaPlayer mp; // 声明MediaPlayer对象AudioManager am; // 声明AudioManager对象@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main); // 设置当前屏幕am = (AudioManager) getSystemService(Service.AUDIO_SERVICE);// 创建AudioManager对象findViewById(R.id.btnPlay).setOnClickListener(new View.OnClickListener() { // 设置监听器public void onClick(View v) { // 重写onClick方法try {mp = MediaPlayer.create(Main.this, R.raw.music);mp.setLooping(true); // 设置循环播放mp.start(); // 播放声音} catch (Exception e) { // 捕获并打印异常e.printStackTrace();}}});((CompoundButton) findViewById(R.id.tbMute)).setOnCheckedChangeListener(new OnCheckedChangeListener() { // 添加监听器public void onCheckedChanged(CompoundButton buttonView,boolean isChecked) {am.setStreamMute(AudioManager.STREAM_MUSIC, !isChecked); // 设置是否静音}});findViewById(R.id.btnUpper).setOnClickListener(new View.OnClickListener() {public void onClick(View v) {am.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_RAISE,AudioManager.FLAG_SHOW_UI); // 调高声音}});findViewById(R.id.btnLower).setOnClickListener(new View.OnClickListener() {public void onClick(View v) {am.adjustStreamVolume(AudioManager.STREAM_MUSIC,AudioManager.ADJUST_LOWER,AudioManager.FLAG_SHOW_UI); // 调低声音}});}}?