轉自：https://www.cnblogs.com/zhangfeitao/p/6245409.html
問題描述：
Android播放視頻的時候，後臺回前臺，導致黑屏 視頻無法播放。
解決之後：
後臺回來正常記憶播放。
下目前是解決問題的代碼。
/*
* Copyright (C) 2006 The Android Open Source Project
* Copyright (c) 2014-2016 Chukong Technologies Inc.
* Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.cocos2dx.lib;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.res.AssetFileDescriptor;
import android.content.res.Resources;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnErrorListener;
import android.net.Uri;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.widget.FrameLayout;
import android.widget.MediaController.MediaPlayerControl;
import java.io.IOException;
import java.util.Map;
public class Cocos2dxVideoView extends SurfaceView implements MediaPlayerControl {
private String TAG = "Cocos2dxVideoView";
private Uri mVideoUri;
private int mDuration;
// all possible internal states
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;
/**
* mCurrentState is a VideoView object's current state.
* mTargetState is the state that a method caller intends to reach.
* For instance, regardless the VideoView object's current state,
* calling pause() intends to bring the object to a target state
* of STATE_PAUSED.
*/
private int mCurrentState = STATE_IDLE;
private int mTargetState = STATE_IDLE;
private boolean isComplete = false; //插入一個變量，用來記錄是不是完成播放
// All the stuff we need for playing and showing a video
private SurfaceHolder mSurfaceHolder = null;
private MediaPlayer mMediaPlayer = null;
private int mVideoWidth = 0;
private int mVideoHeight = 0;
private OnVideoEventListener mOnVideoEventListener;
private MediaPlayer.OnPreparedListener mOnPreparedListener;
private int mCurrentBufferPercentage;
private OnErrorListener mOnErrorListener;
// recording the seek position while preparing
private int mSeekWhenPrepared;
protected Cocos2dxActivity mCocos2dxActivity = null;
protected int mViewLeft = 0;
protected int mViewTop = 0;
protected int mViewWidth = 0;
protected int mViewHeight = 0;
protected int mVisibleLeft = 0;
protected int mVisibleTop = 0;
protected int mVisibleWidth = 0;
protected int mVisibleHeight = 0;
protected boolean mFullScreenEnabled = false;
protected int mFullScreenWidth = 0;
protected int mFullScreenHeight = 0;
private int mViewTag = 0;
public Cocos2dxVideoView(Cocos2dxActivity activity,int tag) {
super(activity);
mViewTag = tag;
mCocos2dxActivity = activity;
initVideoView();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mVideoWidth == 0 || mVideoHeight == 0) {
mViewWidth = mVisibleWidth; //解決黑屏。由於某些原因導致mViewWidth、mViewHeight變爲0
mViewHeight = mVisibleHeight;
setMeasuredDimension(mViewWidth, mViewHeight);
Log.i(TAG, ""+mViewWidth+ ":" +mViewHeight);
}
else {
setMeasuredDimension(mVisibleWidth, mVisibleHeight);
Log.i(TAG, ""+mVisibleWidth+ ":" +mVisibleHeight);
}
}
public void setVideoRect(int left, int top, int maxWidth, int maxHeight) {
mViewLeft = left;
mViewTop = top;
mViewWidth = maxWidth;
mViewHeight = maxHeight;
fixSize(mViewLeft, mViewTop, mViewWidth, mViewHeight);
}
public void setFullScreenEnabled(boolean enabled, int width, int height) {
if (mFullScreenEnabled != enabled) {
mFullScreenEnabled = enabled;
if (width != 0 && height != 0) {
mFullScreenWidth = width;
mFullScreenHeight = height;
}
fixSize();
}
}
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:
/* Parent says we can be as big as we want. Just don't be larger
* than max size imposed on ourselves.
*/
result = desiredSize;
break;
case MeasureSpec.AT_MOST:
/* Parent says we can be as big as we want, up to specSize.
* Don't be larger than specSize, and don't be larger than
* the max size imposed on ourselves.
*/
result = Math.min(desiredSize, specSize);
break;
case MeasureSpec.EXACTLY:
// No choice. Do what we are told.
result = specSize;
break;
}
return result;
}
private boolean mNeedResume = false;
@Override
public void setVisibility(int visibility) {
if (visibility == INVISIBLE) {
mNeedResume = isPlaying();
if (mNeedResume) {
mSeekWhenPrepared = getCurrentPosition();
}
}
else if (mNeedResume){
start();
mNeedResume = false;
}
super.setVisibility(visibility);
}
private void initVideoView() {
mVideoWidth = 0;
mVideoHeight = 0;
getHolder().addCallback(mSHCallback);
//Fix issue#11516:Can't play video on Android 2.3.x
getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
setFocusable(true);
setFocusableInTouchMode(true);
mCurrentState = STATE_IDLE;
mTargetState = STATE_IDLE;
}
@Override
public boolean onTouchEvent(MotionEvent event) {
if( mUserInputEnabled && ((event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_UP))
{
/*
if (isPlaying()) {
pause();
} else if(mCurrentState == STATE_PAUSED){
resume();
}
*/
}
return false;
}
private boolean mIsAssetRouse = false;
private boolean mLooping = false;
private boolean mUserInputEnabled = true;
private String mVideoFilePath = null;
private static final String AssetResourceRoot = "assets/";
public void setVideoFileName(String path) {
if (path.startsWith(AssetResourceRoot)) {
path = path.substring(AssetResourceRoot.length());
}
if (path.startsWith("/")) {
mIsAssetRouse = false;
setVideoURI(Uri.parse(path),null);
}
else {
mVideoFilePath = path;
mIsAssetRouse = true;
setVideoURI(Uri.parse(path),null);
}
}
public void setVideoURL(String url) {
mIsAssetRouse = false;
setVideoURI(Uri.parse(url), null);
}
/**
* @hide
*/
private void setVideoURI(Uri uri, Map<String, String> headers) {
mVideoUri = uri;
mSeekWhenPrepared = 0;
mVideoWidth = 0;
mVideoHeight = 0;
openVideo();
requestLayout();
invalidate();
}
public void setLooping(boolean looping) {
mLooping = looping;
}
public void setUserInputEnabled(boolean enableInput) {
mUserInputEnabled = enableInput;
}
public void stopPlayback() {
if (mMediaPlayer != null) {
mMediaPlayer.stop();
mMediaPlayer.release();
mMediaPlayer = null;
mCurrentState = STATE_IDLE;
mTargetState = STATE_IDLE;
}
}
private void openVideo() {
if (mSurfaceHolder == null) {
// not ready for playback just yet, will try again later
return;
}
if (mIsAssetRouse) {
if(mVideoFilePath == null)
return;
} else if(mVideoUri == null) {
return;
}
// Tell the music playback service to pause
// TODO: these constants need to be published somewhere in the framework.
Intent i = new Intent("com.android.music.musicservicecommand");
i.putExtra("command", "pause");
mCocos2dxActivity.sendBroadcast(i);
// we shouldn't clear the target state, because somebody might have
// called start() previously
release(false);
try {
//if (mMediaPlayer == null) {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(mPreparedListener);
mMediaPlayer.setOnVideoSizeChangedListener(mSizeChangedListener);
mMediaPlayer.setOnCompletionListener(mCompletionListener);
mMediaPlayer.setOnErrorListener(mErrorListener);
mMediaPlayer.setOnBufferingUpdateListener(mBufferingUpdateListener);
mMediaPlayer.setDisplay(mSurfaceHolder);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setScreenOnWhilePlaying(true);
mMediaPlayer.setLooping(mLooping); // CROWDSTAR
//}
mDuration = -1;
mCurrentBufferPercentage = 0;
if (mIsAssetRouse) {
AssetFileDescriptor afd = mCocos2dxActivity.getAssets().openFd(mVideoFilePath);
if (afd == null && Cocos2dxHelper.getObbFile() != null) {
afd = Cocos2dxHelper.getObbFile() .getAssetFileDescriptor(mVideoFilePath);
}
mMediaPlayer.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength());
} else {
mMediaPlayer.setDataSource(mCocos2dxActivity, mVideoUri);
}
mMediaPlayer.prepareAsync();
/**
* Don't set the target state here either, but preserve the target state that was there before.
*/
mCurrentState = STATE_PREPARING;
} catch (IOException ex) {
Log.w(TAG, "Unable to open content: " + mVideoUri, 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: " + mVideoUri, ex);
mCurrentState = STATE_ERROR;
mTargetState = STATE_ERROR;
mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
return;
}
}
private boolean mKeepRatio = false;
public void setKeepRatio(boolean enabled) {
mKeepRatio = enabled;
fixSize();
}
public void fixSize() {
if (mFullScreenEnabled) {
fixSize(0, 0, mFullScreenWidth, mFullScreenHeight);
} else {
fixSize(mViewLeft, mViewTop, mViewWidth, mViewHeight);
}
}
public void fixSize(int left, int top, int width, int height) {
if (mVideoWidth == 0 || mVideoHeight == 0) {
mVisibleLeft = left;
mVisibleTop = top;
mVisibleWidth = width;
mVisibleHeight = height;
}
else if (width != 0 && height != 0) {
if (mKeepRatio) {
if ( mVideoWidth * height > width * mVideoHeight ) {
mVisibleWidth = width;
mVisibleHeight = width * mVideoHeight / mVideoWidth;
} else if ( mVideoWidth * height < width * mVideoHeight ) {
mVisibleWidth = height * mVideoWidth / mVideoHeight;
mVisibleHeight = height;
}
mVisibleLeft = left + (width - mVisibleWidth) / 2;
mVisibleTop = top + (height - mVisibleHeight) / 2;
} else {
mVisibleLeft = left;
mVisibleTop = top;
mVisibleWidth = width;
mVisibleHeight = height;
}
}
else {
mVisibleLeft = left;
mVisibleTop = top;
mVisibleWidth = mVideoWidth;
mVisibleHeight = mVideoHeight;
}
getHolder().setFixedSize(mVisibleWidth, mVisibleHeight);
FrameLayout.LayoutParams lParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT,
FrameLayout.LayoutParams.WRAP_CONTENT);
lParams.leftMargin = mVisibleLeft;
lParams.topMargin = mVisibleTop;
lParams.gravity = Gravity.TOP | Gravity.LEFT;
setLayoutParams(lParams);
}
protected
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);
}
}
};
MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
public void onPrepared(MediaPlayer mp) {
mCurrentState = STATE_PREPARED;
if (mOnPreparedListener != null) {
mOnPreparedListener.onPrepared(mMediaPlayer);
}
mVideoWidth = mp.getVideoWidth();
mVideoHeight = mp.getVideoHeight();
// mSeekWhenPrepared may be changed after seekTo() call
int seekToPosition = mSeekWhenPrepared;
if (seekToPosition != 0) {
seekTo(seekToPosition);
}
if (mVideoWidth != 0 && mVideoHeight != 0) {
fixSize();
}
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;
// Do not release the player if we are looping as we still need the
// the player resources to exist
if (!mLooping) {
release(true);
}
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag,EVENT_COMPLETED);
}
}
};
private static final int EVENT_PLAYING = 0;
private static final int EVENT_PAUSED = 1;
private static final int EVENT_STOPPED = 2;
private static final int EVENT_COMPLETED = 3;
private static final int EVENT_ERROR = 4;
public interface OnVideoEventListener
{
void onVideoEvent(int tag,int event);
}
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 (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_ERROR);
}
/* If an error handler has been supplied, use it and finish. */
if (mOnErrorListener != null) {
if (mOnErrorListener.onError(mMediaPlayer, framework_err, impl_err)) {
return true;
}
}
/* Otherwise, pop up an error dialog so the user knows that
* something bad has happened. Only try and pop up the dialog
* if we're attached to a window. When we're going away and no
* longer have a window, don't bother showing the user an error.
*/
if (getWindowToken() != null) {
Resources r = mCocos2dxActivity.getResources();
int messageId;
if (framework_err == MediaPlayer.MEDIA_ERROR_NOT_VALID_FOR_PROGRESSIVE_PLAYBACK) {
// messageId = com.android.internal.R.string.VideoView_error_text_invalid_progressive_playback;
messageId = r.getIdentifier("VideoView_error_text_invalid_progressive_playback", "string", "android");
} else {
// messageId = com.android.internal.R.string.VideoView_error_text_unknown;
messageId = r.getIdentifier("VideoView_error_text_unknown", "string", "android");
}
int titleId = r.getIdentifier("VideoView_error_title", "string", "android");
int buttonStringId = r.getIdentifier("VideoView_error_button", "string", "android");
new AlertDialog.Builder(mCocos2dxActivity)
.setTitle(r.getString(titleId))
.setMessage(messageId)
.setPositiveButton(r.getString(buttonStringId),
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
/* If we get here, there is no onError listener, so
* at least inform them that the video is over.
*/
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag,EVENT_COMPLETED);
}
}
})
.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 play back.
*
* @param l The callback that will be run
*/
public void setOnCompletionListener(OnVideoEventListener l)
{
mOnVideoEventListener = l;
}
/**
* Register a callback to be invoked when an error occurs
* during play back 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;
}
SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback()
{
public void surfaceChanged(SurfaceHolder holder, int format,
int w, int h)
{
boolean isValidState = (mTargetState == STATE_PLAYING)|| !isComplete; //2.加入isComplete判斷
//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)
{
// after we return from this we can't use the surface any more
mSurfaceHolder = null;
if(mCurrentState == STATE_PLAYING) {
isComplete = mMediaPlayer.getCurrentPosition() == mMediaPlayer.getDuration(); //保存一下當前進度和是否播放完成
mSeekWhenPrepared = mMediaPlayer.getCurrentPosition(); //保存一下當前進度和是否播放完成
}
release(true);
}
};
/*
* release the media player in any state
*/
private void release(boolean cleartargetstate) {
if (mMediaPlayer != null) {
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
mCurrentState = STATE_IDLE;
if (cleartargetstate) {
mTargetState = STATE_IDLE;
}
}
}
public void start() {
if (isInPlaybackState()) {
if (mSeekWhenPrepared != 0) {
seekTo(mSeekWhenPrepared);
}
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_PLAYING);
}
}
mTargetState = STATE_PLAYING;
}
public void pause() {
if (isInPlaybackState()) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
mCurrentState = STATE_PAUSED;
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_PAUSED);
}
}
}
mTargetState = STATE_PAUSED;
}
public void stop() {
if (isInPlaybackState()) {
if (mMediaPlayer.isPlaying()) {
stopPlayback();
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_STOPPED);
}
}
}
}
public void suspend() {
release(false);
}
public void resume() {
if (isInPlaybackState()) {
if (mCurrentState == STATE_PAUSED) {
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_PLAYING);
}
}
}
}
public void restart() {
if (isInPlaybackState()) {
mMediaPlayer.seekTo(0);
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
mTargetState = STATE_PLAYING;
}
}
// cache duration as mDuration for faster access
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;
}
public boolean isInPlaybackState() {
return (mMediaPlayer != null &&
mCurrentState != STATE_ERROR &&
mCurrentState != STATE_IDLE &&
mCurrentState != STATE_PREPARING);
}
@Override
public boolean canPause() {
return true;
}
@Override
public boolean canSeekBackward() {
return true;
}
@Override
public boolean canSeekForward() {
return true;
}
public int getAudioSessionId () {
return mMediaPlayer.getAudioSessionId();
}
}
調整要點：
1.
private boolean isComplete = false; //插入一個變量，用來記錄是不是完成播放
2.
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
if (mVideoWidth == 0 || mVideoHeight == 0) {
mViewWidth = mVisibleWidth; //解決黑屏。由於某些原因導致mViewWidth、mViewHeight變爲0
mViewHeight = mVisibleHeight;
setMeasuredDimension(mViewWidth, mViewHeight);
Log.i(TAG, ""+mViewWidth+ ":" +mViewHeight);
}
else {
setMeasuredDimension(mVisibleWidth, mVisibleHeight);
Log.i(TAG, ""+mVisibleWidth+ ":" +mVisibleHeight);
}
}
3.
SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback()
{
public void surfaceChanged(SurfaceHolder holder, int format,
int w, int h)
{
boolean isValidState = (mTargetState == STATE_PLAYING)|| !isComplete; //2.加入isComplete判斷
//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)
{
// after we return from this we can't use the surface any more
mSurfaceHolder = null;
if(mCurrentState == STATE_PLAYING) {
isComplete = mMediaPlayer.getCurrentPosition() == mMediaPlayer.getDuration(); //保存一下當前進度和是否播放完成
mSeekWhenPrepared = mMediaPlayer.getCurrentPosition(); //保存一下當前進度和是否播放完成
}
release(true);
}
};
4.
public void start() {
if (isInPlaybackState()) {
if (mSeekWhenPrepared != 0) {
seekTo(mSeekWhenPrepared);//記錄播放進度
}
mMediaPlayer.start();
mCurrentState = STATE_PLAYING;
if (mOnVideoEventListener != null) {
mOnVideoEventListener.onVideoEvent(mViewTag, EVENT_PLAYING);
}
}
mTargetState = STATE_PLAYING;
}