Android多媒体开发 音乐播放(加带进度条、时间显示)

歌曲播放

MediaPlayer mediaPlayer = new MediaPlayer();

if (mediaPlayer.isPlaying()) {

mediaPlayer.reset();//重置为初始状况

}

mediaPlayer.setDataSource("/mnt/sdcard/god.mp3");

mediaPlayer.prepare();

mediaPlayer.start();//直到或恢复播放

mediaPlayer.pause();//暂停播放

mediaPlayer.start();//恢复播放

mediaPlayer.stop();//停止播放

mediaPlayer.release();//释放资源

mediaPlayer.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {//开播完毕事件

@Override public void onCompletion(MediaPlayer arg0) {

mediaPlayer.release();

}

});

mediaPlayer.setOnErrorListener(new MediaPlayer.OnErrorListener() {// 错误处理事件

@Override public boolean onError(MediaPlayer player, int arg1, int arg2) {

mediaPlayer.release();

return false;

}

});

DemoActivity.java:

package cn.itcast.mp3;
import java.io.File;
import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Bundle;
import android.os.Handler;
import android.os.SystemClock;
import android.telephony.PhoneStateListener;
import android.telephony.TelephonyManager;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Chronometer;
import android.widget.Chronometer.OnChronometerTickListener;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.Toast;
public class DemoActivity extends Activity implements OnClickListener,
		OnChronometerTickListener, OnSeekBarChangeListener {
	private EditText et_path;
	private Chronometer et_time;
	private SeekBar sb;
	private Button bt_play, bt_pause, bt_replay, bt_stop;
	private MediaPlayer mediaPlayer;
	private TelephonyManager manager;
	/**
	 * subtime:点击“续播”到暂停时的间隔的和 beginTime：重新回到播放时的bash值 falgTime：点击“播放”时的值
	 * pauseTime：“暂停”时的值
	 */
	private long subtime = 0, beginTime = 0, falgTime = 0, pauseTime = 0;
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		manager = (TelephonyManager) this.getSystemService(TELEPHONY_SERVICE);
		manager.listen(new MyListener(), PhoneStateListener.LISTEN_CALL_STATE);
		sb = (SeekBar) this.findViewById(R.id.sb);
		et_path = (EditText) this.findViewById(R.id.et_path);
		et_time = (Chronometer) this.findViewById(R.id.et_time);
		bt_play = (Button) this.findViewById(R.id.play);
		bt_pause = (Button) this.findViewById(R.id.pause);
		bt_replay = (Button) this.findViewById(R.id.replay);
		bt_stop = (Button) this.findViewById(R.id.stop);
		sb.setEnabled(false);
		sb.setOnSeekBarChangeListener(this);
		bt_play.setOnClickListener(this);
		bt_pause.setOnClickListener(this);
		bt_replay.setOnClickListener(this);
		bt_stop.setOnClickListener(this);
		et_time.setOnChronometerTickListener(this);
	}
	Handler handler = new Handler();
	Runnable updateThread = new Runnable() {
		public void run() {
			// 获得歌曲现在播放位置并设置成播放进度条的值
			if (mediaPlayer != null) {
				sb.setProgress(mediaPlayer.getCurrentPosition());
				// 每次延迟100毫秒再启动线程
				handler.postDelayed(updateThread, 100);
			}
		}
	};
	public void onClick(View v) {
		String path;
		try {
			switch (v.getId()) {
			case R.id.play:
				falgTime = SystemClock.elapsedRealtime();
				path = et_path.getText().toString().trim();
				play(path);
				pauseTime = 0;
				et_time.setBase(falgTime);
				et_time.start();
				break;
			case R.id.pause:
				pause();
				break;
			case R.id.replay:
				if (mediaPlayer != null && mediaPlayer.isPlaying()) {
					mediaPlayer.seekTo(0);
					et_time.setBase(SystemClock.elapsedRealtime());
					et_time.start();
				} else {
					path = et_path.getText().toString().trim();
					play(path);
					et_time.setBase(SystemClock.elapsedRealtime());
					et_time.start();
				}
				if ("续播".equals(bt_pause.getText().toString().trim())) {
					bt_pause.setText("暂停");
				}
				falgTime = SystemClock.elapsedRealtime();
				subtime = 0;
				break;
			case R.id.stop:
				if (mediaPlayer != null && mediaPlayer.isPlaying()) {
					mediaPlayer.stop();
					mediaPlayer = null;
					et_time.setBase(SystemClock.elapsedRealtime());
					et_time.start();
					et_time.stop();
					bt_play.setEnabled(true);
					bt_play.setClickable(true);
				}
				falgTime = 0;
				subtime = 0;
				sb.setProgress(0);
				sb.setEnabled(false);
				break;
			}
		} catch (Exception e) {
			e.printStackTrace();
			Toast.makeText(getApplicationContext(), "文件播放出现异常", 0).show();
		}
	}
	private void pause() {
		// 判断音乐是否在播放
		if (mediaPlayer != null && mediaPlayer.isPlaying()) {
			// 暂停音乐播放器
			mediaPlayer.pause();
			bt_pause.setText("续播");
			sb.setEnabled(false);
			et_time.stop();
			pauseTime = SystemClock.elapsedRealtime();
			// System.out.println("1 pauseTime" + pauseTime);
		} else if (mediaPlayer != null
				&& "续播".equals(bt_pause.getText().toString())) {
			subtime += SystemClock.elapsedRealtime() - pauseTime;
			// System.out.println("2 subtime:" + subtime);
			mediaPlayer.start();
			bt_pause.setText("暂停");
			sb.setEnabled(true);
			beginTime = falgTime + subtime;
			// System.out.println("3 beginTime" + beginTime);
			et_time.setBase(beginTime);
			et_time.start();
		}
	}
	/**
	 * 播放指定地址的音乐文件 .mp3 .wav .amr
	 * 
	 * @param path
	 */
	private void play(String path) throws Exception {
		if ("".equals(path)) {
			Toast.makeText(getApplicationContext(), "路径不能为空", 0).show();
			return;
		}
		File file = new File(path);
		if (file.exists()) {
			mediaPlayer = new MediaPlayer();
			mediaPlayer.setDataSource(path);
			// mediaPlayer.prepare(); // c/c++ 播放器引擎的初始化
			// 同步方法
			// 采用异步的方式
			mediaPlayer.prepareAsync();
			// 为播放器注册
			mediaPlayer.setOnPreparedListener(new OnPreparedListener() {
				public void onPrepared(MediaPlayer mp) {
					// TODO Auto-generated method stub
					mediaPlayer.start();
					bt_play.setEnabled(false);
					bt_play.setClickable(false);
					sb.setMax(mediaPlayer.getDuration());
					handler.post(updateThread);
					sb.setEnabled(true);
				}
			});
			// 注册播放完毕后的事件
			mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
				public void onCompletion(MediaPlayer mp) {
					mediaPlayer.release();
					mediaPlayer = null;
					bt_play.setEnabled(true);
					bt_play.setClickable(true);
					et_time.setBase(SystemClock.elapsedRealtime());
					et_time.start();
					et_time.stop();
					sb.setProgress(0);
				}
			});
		} else {
			Toast.makeText(getApplicationContext(), "文件不存在", 0).show();
			return;
		}
	}
	private class MyListener extends PhoneStateListener {
		@Override
		public void onCallStateChanged(int state, String incomingNumber) {
			super.onCallStateChanged(state, incomingNumber);
			switch (state) {
			case TelephonyManager.CALL_STATE_RINGING:
				// 音乐播放器暂停
				pause();
				break;
			case TelephonyManager.CALL_STATE_IDLE:
				// 重新播放音乐
				pause();
				break;
			}
		}
	}
	public void onChronometerTick(Chronometer chronometer) {
	}
	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {
		// TODO 自动生成的方法存根
		if (fromUser == true && mediaPlayer != null) {
			mediaPlayer.seekTo(progress);
			falgTime = SystemClock.elapsedRealtime();
			beginTime = falgTime - sb.getProgress();
			et_time.setBase(beginTime);
			et_time.start();
		}
	}
	public void onStartTrackingTouch(SeekBar seekBar) {
		// TODO 自动生成的方法存根
	}
	public void onStopTrackingTouch(SeekBar seekBar) {
		// TODO 自动生成的方法存根
	}
}

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