Android下用Media Player实现一个最简单的视频播放器

1. 首先建立一个空的Android工程；

2. 编辑¨res -> layout -> fragment_main.xml¨文件，添加如下控件：

视频显示窗口：

开始按钮：

停止按钮：

3. 编辑¨MainActivity.java¨：

1）创建MediaPlayer

private static MediaPlayer mp = new MediaPlayer();

2）在PlaceholderFragment类onCreateView方法中，获取上述添加的三个控件，并为开始和结束按钮添加消息处理方法。

其中，开始按钮的消息处理方法中包括

mp.reset();mp.setDataSource(Environment.getExternalStorageDirectory().getPath() + "/Movies/big_buck_bunny.mp4");mp.setDisplay(surfaceHolder);mp.prepare();mp.start();

（此处为了尽量简单，文件路径是写死的，需要预先将视频文件保存到指定路径。这里的路径为/storage/emulated/0/Movies/big_buck_bunny.mp4）

结束按钮的消息处理方法中包括

mp.stop();

4. 编辑¨AndroidMainfest.xml¨文件，添加如下代码：

上面这句很重要，否则程序将无法访问保存在sd卡上的文件。

完整的代码和配置文件如下：

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>

fragment_main.xlm

MainActivity.java

package com.example.mediaplayerjavademo;import java.io.File;import java.io.IOException;import android.media.MediaPlayer;import android.os.Bundle;import android.os.Environment;import android.support.v4.app.Fragment;import android.support.v7.app.ActionBarActivity;import android.view.LayoutInflater;import android.view.Menu;import android.view.MenuItem;import android.view.SurfaceHolder;import android.view.SurfaceView;import android.view.View;import android.view.View.OnClickListener;import android.view.ViewGroup;import android.widget.Button;public class MainActivity extends ActionBarActivity {private static Button btplay, btstop;private static MediaPlayer mp = new MediaPlayer();private static SurfaceView surfaceView;private static SurfaceHolder surfaceHolder;     @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);                if (savedInstanceState == null) {            getSupportFragmentManager().beginTransaction()                    .add(R.id.container, new PlaceholderFragment())                    .commit();        }            }    @Override    public boolean onCreateOptionsMenu(Menu menu) {                // Inflate the menu; this adds items to the action bar if it is present.        getMenuInflater().inflate(R.menu.main, menu);        return true;    }    @Override    public boolean onOptionsItemSelected(MenuItem item) {        // Handle action bar item clicks here. The action bar will        // automatically handle clicks on the Home/Up button, so long        // as you specify a parent activity in AndroidManifest.xml.        int id = item.getItemId();        if (id == R.id.action_settings) {            return true;        }        return super.onOptionsItemSelected(item);    }    /**     * A placeholder fragment containing a simple view.     */    public static class PlaceholderFragment extends Fragment {        public PlaceholderFragment() {        }        @Override        public View onCreateView(LayoutInflater inflater, ViewGroup container,                Bundle savedInstanceState) {            View rootView = inflater.inflate(R.layout.fragment_main, container, false);                        surfaceView = (SurfaceView) rootView.findViewById(R.id.surfaceView1);            surfaceHolder = surfaceView.getHolder();            btplay = (Button)rootView.findViewById(R.id.play);            btstop = (Button)rootView.findViewById(R.id.stop);                        btplay.setOnClickListener(new OnClickListener(){            @Override                public void onClick(View v) {            try {            mp.reset();                        mp.setDataSource(Environment.getExternalStorageDirectory().getPath() + "/Movies/big_buck_bunny.mp4");                        mp.setDisplay(surfaceHolder);                        mp.prepare();                        mp.start();                     } catch (IllegalArgumentException e) {                        e.printStackTrace();                     } catch (IllegalStateException e) {                        e.printStackTrace();                     } catch (IOException e) {                        e.printStackTrace();                     }            }            });                        btstop.setOnClickListener(new OnClickListener(){            @Override                public void onClick(View v) {            mp.stop();            }            });                        return rootView;        }    }}

运行效果

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