使用Mediaplay类写一个播放器

时间:2021-08-08 00:26:28

我们知道android本身播放视频的的能力是有限的。。先来一个Demo

另附我的一个还未成熟的播放器,下载地址:http://www.eoemarket.com/soft/370334.html,正在完善中

package cn.marsXTU.mediaplayer;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.os.SystemClock;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.Toast;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.app.Activity;

/**
 * 1.确保在音乐能播放的情况下,进行功能增强
 * @author hjl
 *
 */
public class MainActivity extends Activity implements OnSeekBarChangeListener, OnCompletionListener {

	private boolean isStopUpdatingProgress=false;
	private EditText etPath;
	private MediaPlayer mMediapPlayer;
	private SeekBar mSeekbar;
	private TextView tvCurrentTime;
	private TextView tvTotalTime;

	private final int NORMAL=0;//闲置
	private final int PLAYING=1;//播放中
	private final int PAUSING=2;//暂停
	private final int STOPING=3;//停止中

	private  int currentstate=NORMAL;//播放器当前的状态,默认是空闲状态

	//用行动打消忧虑
	private SurfaceHolder holder;

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

		etPath=(EditText)findViewById(R.id.et_path);
		mSeekbar=(SeekBar) findViewById(R.id.sb_progress);
		tvCurrentTime=(TextView)findViewById(R.id.tv_current_time);
		tvTotalTime=(TextView)findViewById(R.id.tv_total_time);

		mSeekbar.setOnSeekBarChangeListener(this);

		SurfaceView mSurfaceView=(SurfaceView) findViewById(R.id.surfaceview);
		holder=mSurfaceView.getHolder();//SurfaceView帮助类对象

		//是采用自己内部的双缓冲区,而是等待别人推送数据

		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

	}

	/**
	 * 开始
	 * @param v
	 */
	public void start(View v){
		if(mMediapPlayer!=null){
			if(currentstate!=PAUSING){
				mMediapPlayer.start();
				currentstate=PLAYING;
				isStopUpdatingProgress=false;//每次在调用刷新线程时,都要设为false
				return ;
				//下面这个判断完美的解决了停止后重新播放的,释放两个资源的问题
			}else if(currentstate==STOPING){
				mMediapPlayer.reset();
				mMediapPlayer.release();
			}
		}
		play();

	}
	/**
	 * 停止
	 * @param v
	 */
	public void stop(View v){
		if(mMediapPlayer!=null){
			mMediapPlayer.stop();
		}
	}

	/**
	 * 播放输入框的文件
	 */
	private void play(){
		String path=etPath.getText().toString().trim();
		mMediapPlayer=new MediaPlayer();
		try {
			//设置数据类型
			mMediapPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
			//设置以下播放器显示的位置
			mMediapPlayer.setDisplay(holder);

			mMediapPlayer.setDataSource(path);
			mMediapPlayer.prepare();
			mMediapPlayer.start();

			mMediapPlayer .setOnCompletionListener(this);
			//把当前播放器的状诚置为:播放中
			currentstate=PLAYING;

			//把音乐文件的总长度取出来,设置给seekbar作为最大值
			int duration=mMediapPlayer.getDuration();//总时长
			mSeekbar.setMax(duration);
			//把总时间显示textView上
			int m=duration/1000/60;
			int s=duration/1000%60;
			tvTotalTime.setText("/"+m+":"+s);
			tvCurrentTime.setText("00:00");

			isStopUpdatingProgress=false;
			new Thread(new UpdateProgressRunnable()).start();

		}catch(Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 暂停
	 * @param v
	 */
	public void pause(View v){
		if(mMediapPlayer!=null&¤tstate==PLAYING){

			mMediapPlayer.pause();
			currentstate=PAUSING;
			isStopUpdatingProgress=true;//停止刷新主线程
		}
	}

	/**
	 * 重播
	 * @param v
	 */
	public void restart(View v){
		if(mMediapPlayer!=null){
			mMediapPlayer.reset();
			mMediapPlayer.release();
			play();
		}
	}

	@Override
	public void onProgressChanged(SeekBar seekBar, int progress,
			boolean fromUser) {

	}

	@Override
	public void onStartTrackingTouch(SeekBar seekBar) {
		isStopUpdatingProgress=true;//当开始拖动时,那么就开始停止刷新线程
	}

	@Override
	public void onStopTrackingTouch(SeekBar seekBar) {
		int progress=seekBar.getProgress();
		//播放器切换到指定的进度位置上
		mMediapPlayer.seekTo(progress);
		isStopUpdatingProgress=false;
		new Thread(new UpdateProgressRunnable()).start();
	}

	/**
	 * 当播放完成时回调此方法
	 */
	@Override
	public void onCompletion(MediaPlayer mp) {
	    Toast.makeText(this, "播放完了,重新再播放", 0).show();
	    mp.start();

	}

	/**
	 * 刷新进度和时间的任务
	 * @author hjl
	 *
	 */
	class  UpdateProgressRunnable implements Runnable{

		@Override
		public void run() {
			//每隔1秒钟取一下当前正在播放的进度,设置给seekbar
			while(!isStopUpdatingProgress){
				//得到当前进度
				int currentPosition=mMediapPlayer.getCurrentPosition();
				mSeekbar.setProgress(currentPosition);
				final int m=currentPosition/1000/60;
				final int s=currentPosition/1000%60;

				//此方法给定的runable对象,会执行主线程(UI线程中)
				runOnUiThread(new Runnable(){

					@Override
					public void run() {
						tvCurrentTime.setText(m+":"+s);

					}

				});
				SystemClock.sleep(1000);
			}

		}

	}

}