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：

<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="480dp"
android:layout_height="272dp"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="18dp" />

开始按钮：

<Button
android:id="@+id/play"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/surfaceView1"
android:layout_marginTop="28dp"
android:text="Play" />

停止按钮：

<Button
android:id="@+id/stop"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/surfaceView1"
android:layout_alignTop="@+id/play"
android:layout_marginRight="28dp"
android:text="Stop" />

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：

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />

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"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mediaplayerjavademo"
android:versionCode="1"
android:versionName="1.0" >

<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />

<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.mediaplayerjavademo.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />

<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
</manifest>

fragment_main.xlm

<RelativeLayout 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:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context="com.example.mediaplayerjavademo.MainActivity$PlaceholderFragment" >

<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/player_title" />

<SurfaceView
android:id="@+id/surfaceView1"
android:layout_width="480dp"
android:layout_height="272dp"
android:layout_alignLeft="@+id/textView1"
android:layout_below="@+id/textView1"
android:layout_marginTop="18dp" />

<Button
android:id="@+id/play"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/textView1"
android:layout_below="@+id/surfaceView1"
android:layout_marginTop="28dp"
android:text="Play" />

<Button
android:id="@+id/stop"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:layout_alignRight="@+id/surfaceView1"
android:layout_alignTop="@+id/play"
android:layout_marginRight="28dp"
android:text="Stop" />

</RelativeLayout>

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