视频播放

视频和声音是分开的，这就是为什么有一些电影的声音是不同步的，因为只是压制在一起的

SeekBar可拖动进度条，通过设置setOnSeekBarChangeListener监听

MediaPlayer是多媒体播放器

SurfaceView能得到显示界面内容的容器

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity" >

    <EditText
        android:id="@+id/et_path"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="请输入要播放文件的路径" />

    <SeekBar
        android:id="@+id/seekBar1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/bt_play"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="play"
            android:text="播放" />

        <Button
            android:id="@+id/bt_pause"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="pause"
            android:text="暂停" />

        <Button
            android:id="@+id/bt_stop"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="stop"
            android:text="停止" />

        <Button
            android:id="@+id/bt_replay"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:onClick="replay"
            android:text="重播" />
    </LinearLayout>

    <SurfaceView
        android:id="@+id/sv"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent" />

</LinearLayout>

package com.itheima.musicplayer;

import java.io.File;
import java.io.IOException;
import java.util.Timer;
import java.util.TimerTask;

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

//视频和声音是分开的，这就是为什么有一些电影的声音是不同步的，因为只是压制在一起的
public class MainActivity extends Activity {
	private EditText et_path;
	private MediaPlayer mediaPlayer;
	
	private Button bt_play,bt_pause,bt_stop,bt_replay;
	
	private SurfaceView sv;
	private SurfaceHolder holder;
	
	private int position;
	private String filepath;

	private SeekBar seekBar1;
	
	private Timer timer;
	private TimerTask task;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_path = (EditText) findViewById(R.id.et_path);
		bt_play = (Button) findViewById(R.id.bt_play);
		bt_pause = (Button) findViewById(R.id.bt_pause);
		bt_stop = (Button) findViewById(R.id.bt_stop);
		bt_replay = (Button) findViewById(R.id.bt_replay);
		
		seekBar1 = (SeekBar) findViewById(R.id.seekBar1);
		//设置拖动条改变的监听器
		seekBar1.setOnSeekBarChangeListener(new OnSeekBarChangeListener() {
			
			@Override
			public void onStopTrackingTouch(SeekBar seekBar) {
				//当手离开的时候
				//获取当前对应的位置
				int postion = seekBar.getProgress();
				mediaPlayer.seekTo(postion);
			}
			
			@Override
			public void onStartTrackingTouch(SeekBar seekBar) {
				//当手刚按上的时候
				
			}
			
			@Override
			public void onProgressChanged(SeekBar seekBar, int progress,
					boolean fromUser) {
				//当进度条发生改变的时候
				
			}
		});
		
		//得到surfaceview   surfaceview是比较消耗内存的，所以一旦界面不可视的时候，holder就会被销毁
		sv = (SurfaceView) findViewById(R.id.sv);
		//得到显示界面内容的容器
		holder = sv.getHolder();
		
		//在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。
		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		
		holder.addCallback(new Callback() {
			
			@Override
			public void surfaceDestroyed(SurfaceHolder holder) {
				//surface被销毁
				System.out.println("destoryed");
				if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
					//获取播放到的位置
					position = mediaPlayer.getCurrentPosition();
					mediaPlayer.stop();
					mediaPlayer.release();
					mediaPlayer = null;
					timer.cancel();
					task.cancel();
					timer = null;
					task = null;
				}
			}
			
			@Override
			public void surfaceCreated(SurfaceHolder holder) {
				//surface被创建
				System.out.println("created");
				if(position>0){//记录的有播放进度。
					try {
						mediaPlayer = new MediaPlayer();
						mediaPlayer.setDataSource(filepath);//设置播放的数据源。
						mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
						mediaPlayer.setDisplay(holder);
						mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
						mediaPlayer.start();
						//跳到播放记录处
						mediaPlayer.seekTo(position);
						bt_play.setEnabled(false);
						mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
							@Override
							public void onCompletion(MediaPlayer mp) {
								bt_play.setEnabled(true);
							}
						});
						int max = mediaPlayer.getDuration();
						seekBar1.setMax(max);
						timer = new Timer();
						task = new TimerTask() {
							@Override
							public void run() {
								seekBar1.setProgress(mediaPlayer.getCurrentPosition());
							}
						};
						timer.schedule(task, 0, 500);
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
			
			@Override
			public void surfaceChanged(SurfaceHolder holder, int format, int width,
					int height) {
				//surface发生改变时
				System.out.println("changed");
			}
		});
		
	}
	/**
	 * 播放
	 * @param view
	 */
	public void play(View view) {
		filepath = et_path.getText().toString().trim();
		File file = new File(filepath);
		if(file.exists()){
			try {
				mediaPlayer = new MediaPlayer();
				mediaPlayer.setDataSource(filepath);//设置播放的数据源。
				mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
				
				//设置显示在那个容器里面
				mediaPlayer.setDisplay(holder);
				mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
				mediaPlayer.start();
				//设置拖动进度条的最大值
				int max = mediaPlayer.getDuration();
				seekBar1.setMax(max);
				timer = new Timer();
				task = new TimerTask() {
					@Override
					public void run() {
						seekBar1.setProgress(mediaPlayer.getCurrentPosition());
					}
				};
				timer.schedule(task, 0, 500);
				
				bt_play.setEnabled(false);
				mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
					@Override
					public void onCompletion(MediaPlayer mp) {
						bt_play.setEnabled(true);
					}
				});
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(this, "播放失败", 0).show();
			}
		}else{
			Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
		}
	}
	/**
	 * 暂停
	 * @param view
	 */
	public void pause(View view) {
		if("继续".equals(bt_pause.getText().toString())){
			mediaPlayer.start();
			bt_pause.setText("暂停");
			return;
		}
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.pause();
			bt_pause.setText("继续");
		}
	}
	/**
	 * 停止
	 * @param view
	 */
	public void stop(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.stop();
			mediaPlayer.release();
			mediaPlayer = null;
		}
		bt_pause.setText("暂停");
		bt_play.setEnabled(true);
	}
	/**
	 * 重播
	 * @param view
	 */
	public void replay(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.seekTo(0);
		}else{
			play(view);
		}
		bt_pause.setText("暂停");
	}

}

在线视频播放器

package com.itheima.musicplayer;

import java.io.File;
import java.io.IOException;

import android.app.Activity;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity {
	private EditText et_path;
	
	private MediaPlayer mediaPlayer;
	
	private Button bt_play,bt_pause,bt_stop,bt_replay;
	
	private SurfaceView sv;
	private SurfaceHolder holder;
	
	private int position;
	private String filepath;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		et_path = (EditText) findViewById(R.id.et_path);
		bt_play = (Button) findViewById(R.id.bt_play);
		bt_pause = (Button) findViewById(R.id.bt_pause);
		bt_stop = (Button) findViewById(R.id.bt_stop);
		bt_replay = (Button) findViewById(R.id.bt_replay);
		//得到surfaceview
		sv = (SurfaceView) findViewById(R.id.sv);
		//得到显示界面内容的容器
		holder = sv.getHolder();
		//在低版本模拟器上运行记得加上下面的参数。不自己维护双缓冲区，而是等待多媒体播放框架主动的推送数据。
		holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
		holder.addCallback(new Callback() {
			
			@Override
			public void surfaceDestroyed(SurfaceHolder holder) {
				System.out.println("destoryed");
				if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
					position = mediaPlayer.getCurrentPosition();
					mediaPlayer.stop();
					mediaPlayer.release();
					mediaPlayer = null;
				}
			}
			
			@Override
			public void surfaceCreated(SurfaceHolder holder) {
				System.out.println("created");
				if(position>0){//记录的有播放进度。
					try {
						mediaPlayer = new MediaPlayer();
						mediaPlayer.setDataSource(filepath);//设置播放的数据源。
						mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
						mediaPlayer.setDisplay(holder);
						mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
						mediaPlayer.start();
						mediaPlayer.seekTo(position);
						bt_play.setEnabled(false);
						mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
							@Override
							public void onCompletion(MediaPlayer mp) {
								bt_play.setEnabled(true);
							}
						});
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
			
			@Override
			public void surfaceChanged(SurfaceHolder holder, int format, int width,
					int height) {
				System.out.println("changed");
			}
		});
		
	}
	/**
	 * 播放
	 * @param view
	 */
	public void play(View view) {
		filepath = et_path.getText().toString().trim();
		//File file = new File(filepath);
		if(filepath.startsWith("http://")){
			try {
				mediaPlayer = new MediaPlayer();
				mediaPlayer.setDataSource(filepath);//设置播放的数据源。
				mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
				mediaPlayer.setDisplay(holder);
				mediaPlayer.prepare();//准备开始播放 播放的逻辑是c代码在新的线程里面执行。
				mediaPlayer.start();
				bt_play.setEnabled(false);
				mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
					@Override
					public void onCompletion(MediaPlayer mp) {
						bt_play.setEnabled(true);
					}
				});
			} catch (Exception e) {
				e.printStackTrace();
				Toast.makeText(this, "播放失败", 0).show();
			}
		}else{
			Toast.makeText(this, "文件不存在，请检查文件的路径", 0).show();
		}
	}
	/**
	 * 暂停
	 * @param view
	 */
	public void pause(View view) {
		if("继续".equals(bt_pause.getText().toString())){
			mediaPlayer.start();
			bt_pause.setText("暂停");
			return;
		}
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.pause();
			bt_pause.setText("继续");
		}
	}
	/**
	 * 停止
	 * @param view
	 */
	public void stop(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.stop();
			mediaPlayer.release();
			mediaPlayer = null;
		}
		bt_pause.setText("暂停");
		bt_play.setEnabled(true);
	}
	/**
	 * 重播
	 * @param view
	 */
	public void replay(View view) {
		if(mediaPlayer!=null&&mediaPlayer.isPlaying()){
			mediaPlayer.seekTo(0);
		}else{
			play(view);
		}
		bt_pause.setText("暂停");
	}

}