视频播放的代码

1。j界面设计代码

<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:background="#FFFFCC"

android:orientation="vertical"

tools:context=".MainActivity" >

<TextView

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="@string/video_text" />

<EditText

android:id="@+id/videoFileEt"

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:text="cat.3gp" />

<TableLayout

android:layout_width="fill_parent"

android:layout_height="wrap_content"

android:gravity="center"

android:stretchColumns="*" >

<TableRow>

<ImageButton

android:id="@+id/playBtn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/play" />

<ImageButton

android:id="@+id/pauseBtn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/pause" />

<ImageButton

android:id="@+id/resetBtn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/reset" />

<ImageButton

android:id="@+id/stopBtn"

android:layout_width="wrap_content"

android:layout_height="wrap_content"

android:src="@drawable/stop" />

</TableRow>

</TableLayout>

<SurfaceView

android:id="@+id/surfaceView"

android:layout_width="fill_parent"

android:layout_height="240dip" />

</LinearLayout>

2.string的文件

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

<resources>

<string name="app_name">视频播放器</string>

<string name="hello_world">Hello world!</string>

<string name="menu_settings">Settings</string>

<string name="video_text">视频文件</string>

<string name="notfoundsdcard_error">找不到Sd卡</string>

<string name="notfoundfile_error">找不到视频文件</string>

</resources>

3。activity的java代码

package com.example.radioplayer1;

import java.io.File;

import java.io.IOException;

import android.app.Activity;

import android.media.AudioManager;

import android.media.MediaPlayer;

import android.os.Bundle;

import android.os.Environment;

import android.util.Log;

import android.view.SurfaceHolder;

import android.view.SurfaceHolder.Callback;

import android.view.SurfaceView;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.EditText;

import android.widget.ImageButton;

import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

private static final String TAG = "VideoPlayerActivity";

private ImageButton playBtn, pauseBtn, resetBtn, stopBtn;

private EditText fileEt;

private SurfaceView videoSv;

private MediaPlayer mediaPlayer;

private SurfaceHolder holder;

private int position = 0;

File videoFile = null;

@Override

protected void onRestoreInstanceState(Bundle savedInstanceState) {

position = savedInstanceState.getInt("position");

String fn = savedInstanceState.getString("fileName");

if(fn!=null){

videoFile = new File(Environment.getExternalStorageDirectory(),fn);

}

super.onRestoreInstanceState(savedInstanceState);

}

@Override

protected void onSaveInstanceState(Bundle outState) {

outState.putInt("position", position);

outState.putString("fileName", videoFile.getName());

super.onSaveInstanceState(outState);

}

public void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

findViews();

mediaPlayer = new MediaPlayer();

}

private void findViews() {

fileEt = (EditText) this.findViewById(R.id.videoFileEt);

playBtn = (ImageButton) this.findViewById(R.id.playBtn);

pauseBtn = (ImageButton) this.findViewById(R.id.pauseBtn);

resetBtn = (ImageButton) this.findViewById(R.id.resetBtn);

stopBtn = (ImageButton) this.findViewById(R.id.stopBtn);

playBtn.setOnClickListener(this);

pauseBtn.setOnClickListener(this);

resetBtn.setOnClickListener(this);

stopBtn.setOnClickListener(this);

videoSv = (SurfaceView) this.findViewById(R.id.surfaceView);

holder = videoSv.getHolder();

holder.setFixedSize(176, 144); // 设置分辨率

/* 下面设置Surface不维护自己的缓冲区，而是等待屏幕的渲染引擎将内容推送到用户面前 */

holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

holder.addCallback(new SurfaceCallback());

}

public void onClick(View v) {

if (Environment.getExternalStorageState().equals( Environment.MEDIA_MOUNTED)) {

String fileName = fileEt.getText().toString().trim();

videoFile = new File(

Environment.getExternalStorageDirectory(), fileName);

if (videoFile.exists()) {

try {

switch (v.getId()) {

case R.id.playBtn:

playVideo(videoFile);

break;

case R.id.pauseBtn:

if(mediaPlayer.isPlaying()){

position = mediaPlayer.getCurrentPosition();

mediaPlayer.pause();

}else{

mediaPlayer.start();

}

/* if(mediaPlayer.isPlaying()){

mediaPlayer.pause();

}*/

break;

case R.id.resetBtn:

if(mediaPlayer.isPlaying()){

mediaPlayer.seekTo(0);

}else{

playVideo(videoFile);

}

break;

case R.id.stopBtn:

if(mediaPlayer.isPlaying()){

mediaPlayer.stop();

}

break;

}

} catch (Exception e) {

Log.e(TAG, e.toString());

}

} else {

showToast(R.string.notfoundfile_error);

}

} else {

showToast(R.string.notfoundsdcard_error);

}

}

private void playVideo(File videoFile) throws IOException {

mediaPlayer.reset();

mediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

mediaPlayer.setDataSource(videoFile.getAbsolutePath());

mediaPlayer.setDisplay(holder);

mediaPlayer.prepare();

mediaPlayer.start();

}

private void showToast(int resId) {

Toast.makeText(this, resId, 1).show();

}

protected void onDestroy() {

if(mediaPlayer != null){

if(mediaPlayer.isPlaying()){

mediaPlayer.stop();

}

mediaPlayer.release();

}

super.onDestroy();

}

/* @Override

protected void onPause() {

if(mediaPlayer != null && mediaPlayer.isPlaying()){

position = mediaPlayer.getCurrentPosition();

mediaPlayer.stop();

}

super.onPause();

}

@Override

protected void onResume() {

if(position >0 && videoFile != null){

try {

playVideo(videoFile);

Log.i(TAG,"position="+ position);

mediaPlayer.seekTo(position);

position = 0;

} catch (IOException e) {

Log.e(TAG,e.toString());

}

}

super.onResume();

}*/

private final class SurfaceCallback implements Callback{

@Override

public void surfaceCreated(SurfaceHolder holder) {

if(position >0 && videoFile != null){

try {

playVideo(videoFile);

Log.i(TAG,"position="+ position);

mediaPlayer.seekTo(position);

position = 0;

} catch (IOException e) {

Log.e(TAG,e.toString());

}

}

Log.i(TAG, "surfaceCreated");

}

@Override

public void surfaceChanged(SurfaceHolder holder, int format, int width,

int height) {

// TODO Auto-generated method stub

}

@Override

public void surfaceDestroyed(SurfaceHolder holder) {

if(mediaPlayer != null && mediaPlayer.isPlaying()){

position = mediaPlayer.getCurrentPosition();

mediaPlayer.stop();

}

Log.i(TAG, "surfaceDestroyed");

}

}

}