关于android的VideoView的使用

Android自带了一个VideoView，用来播放视频和网络视频，它是继承SurfaceView使用MediaPlayer来做播放的类。

VideoView使用的一个简单实例：

Layout文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:background="@drawable/bg"
　　>
<Button
android:id="@+id/btn"
android:text="@string/playbtn"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
<VideoView
android:id="@+id/videowiew"
android:layout_gravity="center_horizontal"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>

</LinearLayout>

播放代码：

public class ListviewActivity extends Activity {

VideoView mVideoView;
Button btn;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.activity_listview);
btn = (Button)findViewById(R.id.btn);

mVideoView = (VideoView)findViewById(R.id.videowiew);

btn.setOnClickListener(click);

MediaController mController = new MediaController(this);
mVideoView.setMediaController(mController);//设置一个控制条

}

OnClickListener click = new OnClickListener() {

@Override
public void onClick(View v) {

Uri uri = Uri.parse("http://10.0.245.2:9090/router?id=000000000000000000000566");
//Uri uri = Uri.parse("http://daily3gp.com/vids/family_guy_penis_car.3gp");
mVideoView.setVideoURI(uri);

mVideoView.requestFocus();
mVideoView.start();

}
};

注意要播放网络视频的话，还要在AndroidManifest.xml中加入：

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

权限

显示的图像：



由于是播放的视频，所以截不到图像，中间是一个控制条，通过

MediaController mController = new MediaController(this);
mVideoView.setMediaController(mController);

来加入，如果没有也可以播放，只是没有了这个控制条。这是android自带的控制条，具有暂停，快进，快退，一个进度显示条等。
完整工程代码可以到我的资源下载区下载。

http://download.csdn.net/detail/taoxugang2012/6500453

当然很多时候我们是不满足于使用别人的代码的，使用android的VideoView任然存在有些不足，比如说系统带的控制条太难看，全屏播放时无法全屏。

通过查看源码可以修改该VideoView类，最开始，将源代码拷贝过来用，会出现一些问题，修改了一些部分后就可用了，具体如下：

import java.io.IOException;
import java.util.Map;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
//import android.content.res.Resources;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.media.MediaPlayer.OnErrorListener;
import android.media.MediaPlayer.OnInfoListener;
import android.net.Uri;
import android.util.AttributeSet;
import android.util.Log;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.accessibility.AccessibilityEvent;
import android.view.accessibility.AccessibilityNodeInfo;
import android.widget.MediaController;
import android.widget.MediaController.MediaPlayerControl;

public class VideoView extends SurfaceView implements MediaPlayerControl {
private String TAG = "VideoView";

private Uri         mUri;
private Map<String, String> mHeaders;
private int         mDuration;

private static final int STATE_ERROR              = -1;
private static final int STATE_IDLE               = 0;
private static final int STATE_PREPARING          = 1;
private static final int STATE_PREPARED           = 2;
private static final int STATE_PLAYING            = 3;
private static final int STATE_PAUSED             = 4;
private static final int STATE_PLAYBACK_COMPLETED = 5;

private int mCurrentState = STATE_IDLE;
private int mTargetState  = STATE_IDLE;

private SurfaceHolder mSurfaceHolder = null;
private MediaPlayer mMediaPlayer = null;
private int         mVideoWidth;
private int         mVideoHeight;
private int         mSurfaceWidth;
private int         mSurfaceHeight;
private MediaController mMediaController;
private OnCompletionListener mOnCompletionListener;
private MediaPlayer.OnPreparedListener mOnPreparedListener;
private int         mCurrentBufferPercentage;
private OnErrorListener mOnErrorListener;
private OnInfoListener  mOnInfoListener;
private int         mSeekWhenPrepared;
private boolean     mCanPause;
private boolean     mCanSeekBack;
private boolean     mCanSeekForward;
Context mContext;

public VideoView(Context context) {
super(context);
mContext = context;
initVideoView();
}

public VideoView(Context context, AttributeSet attrs) {
this(context, attrs, 0);
mContext = context;
initVideoView();
}

public VideoView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
mContext = context;
initVideoView();
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int width = getDefaultSize(mVideoWidth, widthMeasureSpec);
int height = getDefaultSize(mVideoHeight, heightMeasureSpec);
if (mVideoWidth > 0 && mVideoHeight > 0) {
if ( mVideoWidth * height  > width * mVideoHeight ) {
height = width * mVideoHeight / mVideoWidth;
} else if ( mVideoWidth * height  < width * mVideoHeight ) {
width = height * mVideoWidth / mVideoHeight;
}
}
setMeasuredDimension(width, height);
}

@Override
public void onInitializeAccessibilityEvent(AccessibilityEvent event) {
super.onInitializeAccessibilityEvent(event);
event.setClassName(VideoView.class.getName());
}

@Override
public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {
super.onInitializeAccessibilityNodeInfo(info);
info.setClassName(VideoView.class.getName());
}

public int resolveAdjustedSize(int desiredSize, int measureSpec) {
int result = desiredSize;
int specMode = MeasureSpec.getMode(measureSpec);
int specSize =  MeasureSpec.getSize(measureSpec);

switch (specMode) {
case MeasureSpec.UNSPECIFIED:
result = desiredSize;
break;

case MeasureSpec.AT_MOST:
result = Math.min(desiredSize, specSize);
break;

case MeasureSpec.EXACTLY:
result = specSize;
break;
}
return result;
}

private void initVideoView() {
mVideoWidth = 0;
mVideoHeight = 0;
getHolder().addCallback(mSHCallback);
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
setFocusable(true);
setFocusableInTouchMode(true);
requestFocus();
mCurrentState = STATE_IDLE;
mTargetState  = STATE_IDLE;
}

public void setVideoPath(String path) {
setVideoURI(Uri.parse(path));
}

public void setVideoURI(Uri uri) {
setVideoURI(uri, null);
}

/**
* @hide
*/
public void setVideoURI(Uri uri, Map<String, String> headers) {
mUri = uri;
mHeaders = headers;
mSeekWhenPrepared = 0;
openVideo();
requestLayout();
invalidate();
}

public void stopPlayback() {
if (mMediaPlayer != null) {
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
mCurrentState = STATE_IDLE;
mTargetState  = STATE_IDLE;
}
}

private void openVideo() {
if (mUri == null || mSurfaceHolder == null) {
return;
}

Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "pause");
mContext.sendBroadcast(i);

release(false);
try {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mPreparedListener);
mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
mDuration = -1;
mMediaPlayer.setOnCompletionListener(mCompletionListener);
mMediaPlayer.setOnErrorListener(mErrorListener);
mMediaPlayer.setOnInfoListener(mOnInfoListener);
mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
mCurrentBufferPercentage = 0;
mMediaPlayer.setDataSource(mContext, mUri, mHeaders);
mMediaPlayer.setDisplay(mSurfaceHolder);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setScreenOnWhilePlaying(true);
mMediaPlayer.prepareAsync();

mCurrentState = STATE_PREPARING;
attachMediaController();
} catch (IOException ex) {
Log.w(TAG, "Unable to open content: " + mUri, ex);
mCurrentState = STATE_ERROR;
mTargetState = STATE_ERROR;
mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
return;
} catch (IllegalArgumentException ex) {
Log.w(TAG, "Unable to open content: " + mUri, ex);
mCurrentState = STATE_ERROR;
mTargetState = STATE_ERROR;
mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
return;
}
}

public void setMediaController(MediaController controller) {
if (mMediaController != null) {
mMediaController.hide();
}
mMediaController = controller;
attachMediaController();
}

private void attachMediaController() {
if (mMediaPlayer != null && mMediaController != null) {
mMediaController.setMediaPlayer(this);
View anchorView = this.getParent() instanceof View ?
(View)this.getParent() : this;
mMediaController.setAnchorView(anchorView);
mMediaController.setEnabled(isInPlaybackState());
}
}

MediaPlayer.OnVideoSizeChangedListener mSizeChangedListener =
new MediaPlayer.OnVideoSizeChangedListener() {
public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
if (mVideoWidth != 0 && mVideoHeight != 0) {
getHolder().setFixedSize(mVideoWidth, mVideoHeight);
requestLayout();
}
}
};

MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
mCurrentState = STATE_PREPARED;

mCanPause = true;

if (mOnPreparedListener != null) {
mOnPreparedListener.onPrepared(mMediaPlayer);
}
if (mMediaController != null) {
mMediaController.setEnabled(true);
}
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();

int seekToPosition = mSeekWhenPrepared;
if (seekToPosition != 0) {
seekTo(seekToPosition);
}
if (mVideoWidth != 0 && mVideoHeight != 0) {
getHolder().setFixedSize(mVideoWidth, mVideoHeight);
if (mSurfaceWidth == mVideoWidth && mSurfaceHeight == mVideoHeight) {
if (mTargetState == STATE_PLAYING) {
start();
if (mMediaController != null) {
mMediaController.show();
}
} else if (!isPlaying() &&
(seekToPosition != 0 || getCurrentPosition() > 0)) {
if (mMediaController != null) {
mMediaController.show(0);
}
}
}
} else {
if (mTargetState == STATE_PLAYING) {
start();
}
}
}
};

private MediaPlayer.OnCompletionListener mCompletionListener =
new MediaPlayer.OnCompletionListener() {
public void onCompletion(MediaPlayer mp) {
mCurrentState = STATE_PLAYBACK_COMPLETED;
mTargetState = STATE_PLAYBACK_COMPLETED;
if (mMediaController != null) {
mMediaController.hide();
}
if (mOnCompletionListener != null) {
mOnCompletionListener.onCompletion(mMediaPlayer);
}
}
};

private MediaPlayer.OnErrorListener mErrorListener =
new MediaPlayer.OnErrorListener() {
public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
Log.d(TAG, "Error: " + framework_err + "," + impl_err);
mCurrentState = STATE_ERROR;
mTargetState = STATE_ERROR;
if (mMediaController != null) {
mMediaController.hide();
}

if (mOnErrorListener != null) {
if (mOnErrorListener.onError(mMediaPlayer, framework_err, impl_err)) {
return true;
}
}

if (getWindowToken() != null) {
//Resources r = mContext.getResources();
int messageId;

if (framework_err == MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK) {
messageId = R.string.VideoView_error_text_invalid_progressive_playback;
} else {
messageId = R.string.VideoView_error_text_unknown;
}

new AlertDialog.Builder(mContext)
.setMessage(messageId)
.setPositiveButton(R.string.VideoView_error_button,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {

if (mOnCompletionListener != null) {
mOnCompletionListener.onCompletion(mMediaPlayer);
}
}
})
.setCancelable(false)
.show();
}
return true;
}
};

private MediaPlayer.OnBufferingUpdateListener mBufferingUpdateListener =
new MediaPlayer.OnBufferingUpdateListener() {
public void onBufferingUpdate(MediaPlayer mp, int percent) {
mCurrentBufferPercentage = percent;
}
};

/**
* Register a callback to be invoked when the media file
* is loaded and ready to go.
*
* @param l The callback that will be run
*/
public void setOnPreparedListener(MediaPlayer.OnPreparedListener l)
{
mOnPreparedListener = l;
}

/**
* Register a callback to be invoked when the end of a media file
* has been reached during playback.
*
* @param l The callback that will be run
*/
public void setOnCompletionListener(OnCompletionListener l)
{
mOnCompletionListener = l;
}

/**
* Register a callback to be invoked when an error occurs
* during playback or setup.  If no listener is specified,
* or if the listener returned false, VideoView will inform
* the user of any errors.
*
* @param l The callback that will be run
*/
public void setOnErrorListener(OnErrorListener l)
{
mOnErrorListener = l;
}

/**
* Register a callback to be invoked when an informational event
* occurs during playback or setup.
*
* @param l The callback that will be run
*/
public void setOnInfoListener(OnInfoListener l) {
mOnInfoListener = l;
}

SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback()
{
public void surfaceChanged(SurfaceHolder holder, int format,
int w, int h)
{
mSurfaceWidth = w;
mSurfaceHeight = h;
boolean isValidState =  (mTargetState == STATE_PLAYING);
boolean hasValidSize = (mVideoWidth == w && mVideoHeight == h);
if (mMediaPlayer != null && isValidState && hasValidSize) {
if (mSeekWhenPrepared != 0) {
seekTo(mSeekWhenPrepared);
}
start();
}
}

public void surfaceCreated(SurfaceHolder holder)
{
mSurfaceHolder = holder;
openVideo();
}

public void surfaceDestroyed(SurfaceHolder holder)
{
mSurfaceHolder = null;
if (mMediaController != null) mMediaController.hide();
release(true);
}
};

private void release(boolean cleartargetstate) {
if (mMediaPlayer != null) {
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
mCurrentState = STATE_IDLE;
if (cleartargetstate) {
mTargetState  = STATE_IDLE;
}
}
}

@Override
public boolean onTouchEvent(MotionEvent ev) {
if (isInPlaybackState() && mMediaController != null) {
toggleMediaControlsVisiblity();
}
return false;
}

@Override
public boolean onTrackballEvent(MotionEvent ev) {
if (isInPlaybackState() && mMediaController != null) {
toggleMediaControlsVisiblity();
}
return false;
}

@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
boolean isKeyCodeSupported = keyCode != KeyEvent.KEYCODE_BACK &&
keyCode != KeyEvent.KEYCODE_VOLUME_UP &&
keyCode != KeyEvent.KEYCODE_VOLUME_DOWN &&
keyCode != KeyEvent.KEYCODE_VOLUME_MUTE &&
keyCode != KeyEvent.KEYCODE_MENU &&
keyCode != KeyEvent.KEYCODE_CALL &&
keyCode != KeyEvent.KEYCODE_ENDCALL;
if (isInPlaybackState() && isKeyCodeSupported && mMediaController != null) {
if (keyCode == KeyEvent.KEYCODE_HEADSETHOOK ||
keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE) {
if (mMediaPlayer.isPlaying()) {
pause();
mMediaController.show();
} else {
start();
mMediaController.hide();
}
return true;
} else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY) {
if (!mMediaPlayer.isPlaying()) {
start();
mMediaController.hide();
}
return true;
} else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP
|| keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE) {
if (mMediaPlayer.isPlaying()) {
pause();
mMediaController.show();
}
return true;
} else {
toggleMediaControlsVisiblity();
}
}

return super.onKeyDown(keyCode, event);
}

private void toggleMediaControlsVisiblity() {
if (mMediaController.isShowing()) {
mMediaController.hide();
} else {
mMediaController.show();
}
}

public void start() {
if (isInPlaybackState()) {
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
}
mTargetState = STATE_PLAYING;
}

public void pause() {
if (isInPlaybackState()) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
mCurrentState = STATE_PAUSED;
}
}
mTargetState = STATE_PAUSED;
}

public void suspend() {
release(false);
}

public void resume() {
openVideo();
}

public int getDuration() {
if (isInPlaybackState()) {
if (mDuration > 0) {
return mDuration;
}
mDuration = mMediaPlayer.getDuration();
return mDuration;
}
mDuration = -1;
return mDuration;
}

public int getCurrentPosition() {
if (isInPlaybackState()) {
return mMediaPlayer.getCurrentPosition();
}
return 0;
}

public void seekTo(int msec) {
if (isInPlaybackState()) {
mMediaPlayer.seekTo(msec);
mSeekWhenPrepared = 0;
} else {
mSeekWhenPrepared = msec;
}
}

public boolean isPlaying() {
return isInPlaybackState() && mMediaPlayer.isPlaying();
}

public int getBufferPercentage() {
if (mMediaPlayer != null) {
return mCurrentBufferPercentage;
}
return 0;
}

private boolean isInPlaybackState() {
return (mMediaPlayer != null &&
mCurrentState != STATE_ERROR &&
mCurrentState != STATE_IDLE &&
mCurrentState != STATE_PREPARING);
}

public boolean canPause() {
return mCanPause;
}

public boolean canSeekBackward() {
return mCanSeekBack;
}

public boolean canSeekForward() {
return mCanSeekForward;
}
}

这个代码没有做功能性修改，只是做了简单移植，编译通过，能够正常播放。

要使用自己定义的videoview，还需要在自己的xml写上完整控件路径

<com.example.listview.VideoView

android:id="@+id/videowiew"

android:layout_gravity="center_horizontal"

android:layout_width="fill_parent"

android:layout_height="fill_parent"/>

这个部分，还不算完美，我之后还想把android的控制条重写。