重写MediaController在不同版本上的兼容方案

(打算使用Android原生VideoView的，尽早脱坑，原生videoView播放网络视频，基本不论长短，都得加载将近10s，无法接受的话，尽快使用第三方库如 Google 开源的Exoplayer)

最近需要自己实现一个播放器,原生的MediaController带有一个默认的播放控制栏,但是需要改成设计图上的样式.弄了半天靠复制MediaController源码重写来解决了问题.代码上传之后结果发现,原生的MediaController代码中有一处,在Android 6.0以上与Android 6.0以下写法不同,分别引用了不同的包,而且新版本中没有旧包,旧版本中没有新包.不好兼容,搁置了好多天.

今天在Google去搜了下,果然搜到外国大神的解决方案了,也是重写了MediaController源码,不过将windowManger相关的代码都替换了,使得不需要再依赖系统中的包,亲测有效,可以与愉快的定制了.
需要注意的是,这样的话只能像例子这样直接使用surfaceview或者重写VideoView支持改动.

https://stackoverflow.com/questions/12482203/how-to-create-custom-ui-for-android-mediacontroller/14323144#14323144
http://www.brightec.co.uk/ideas/custom-android-media-controller

/* * Copyright (C) 2006 The Android Open Source Project * * 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 your.package.name;import android.content.Context;import android.os.Handler;import android.os.Message;import android.util.AttributeSet;import android.util.Log;import android.view.Gravity;import android.view.KeyEvent;import android.view.LayoutInflater;import android.view.MotionEvent;import android.view.View;import android.view.ViewGroup;import android.view.accessibility.AccessibilityEvent;import android.view.accessibility.AccessibilityNodeInfo;import android.widget.FrameLayout;import android.widget.ImageButton;import android.widget.ProgressBar;import android.widget.SeekBar;import android.widget.SeekBar.OnSeekBarChangeListener;import android.widget.TextView;import java.lang.ref.WeakReference;import java.util.Formatter;import java.util.Locale;import your.resource.path;/** * A view containing controls for a MediaPlayer. Typically contains the * buttons like "Play/Pause", "Rewind", "Fast Forward" and a progress * slider. It takes care of synchronizing the controls with the state * of the MediaPlayer. * <p> * The way to use this class is to instantiate it programatically. * The MediaController will create a default set of controls * and put them in a window floating above your application. Specifically, * the controls will float above the view specified with setAnchorView(). * The window will disappear if left idle for three seconds and reappear * when the user touches the anchor view. * <p> * Functions like show() and hide() have no effect when MediaController * is created in an xml layout. *  * MediaController will hide and * show the buttons according to these rules: * <ul> * <li> The "previous" and "next" buttons are hidden until setPrevNextListeners() *   has been called * <li> The "previous" and "next" buttons are visible but disabled if *   setPrevNextListeners() was called with null listeners * <li> The "rewind" and "fastforward" buttons are shown unless requested *   otherwise by using the MediaController(Context, boolean) constructor *   with the boolean set to false * </ul> */public class VideoControllerView extends FrameLayout {    private static final String TAG = "VideoControllerView";    private MediaPlayerControl  mPlayer;    private Context             mContext;    private ViewGroup           mAnchor;    private View                mRoot;    private ProgressBar         mProgress;    private TextView            mEndTime, mCurrentTime;    private boolean             mShowing;    private boolean             mDragging;    private static final int    sDefaultTimeout = 3000;    private static final int    FADE_OUT = 1;    private static final int    SHOW_PROGRESS = 2;    private boolean             mUseFastForward;    private boolean             mFromXml;    private boolean             mListenersSet;    private View.OnClickListener mNextListener, mPrevListener;    StringBuilder               mFormatBuilder;    Formatter                   mFormatter;    private ImageButton         mPauseButton;    private ImageButton         mFfwdButton;    private ImageButton         mRewButton;    private ImageButton         mNextButton;    private ImageButton         mPrevButton;    private ImageButton         mFullscreenButton;    private Handler             mHandler = new MessageHandler(this);    public VideoControllerView(Context context, AttributeSet attrs) {        super(context, attrs);        mRoot = null;        mContext = context;        mUseFastForward = true;        mFromXml = true;        Log.i(TAG, TAG);    }    public VideoControllerView(Context context, boolean useFastForward) {        super(context);        mContext = context;        mUseFastForward = useFastForward;        Log.i(TAG, TAG);    }    public VideoControllerView(Context context) {        this(context, true);        Log.i(TAG, TAG);    }    @Override    public void onFinishInflate() {        if (mRoot != null)            initControllerView(mRoot);    }    public void setMediaPlayer(MediaPlayerControl player) {        mPlayer = player;        updatePausePlay();        updateFullScreen();    }    /**     * Set the view that acts as the anchor for the control view.     * This can for example be a VideoView, or your Activity's main view.     * @param view The view to which to anchor the controller when it is visible.     */    public void setAnchorView(ViewGroup view) {        mAnchor = view;        FrameLayout.LayoutParams frameParams = new FrameLayout.LayoutParams(                ViewGroup.LayoutParams.MATCH_PARENT,                ViewGroup.LayoutParams.MATCH_PARENT        );        removeAllViews();        View v = makeControllerView();        addView(v, frameParams);    }    /**     * Create the view that holds the widgets that control playback.     * Derived classes can override this to create their own.     * @return The controller view.     * @hide This doesn't work as advertised     */    protected View makeControllerView() {        LayoutInflater inflate = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);        mRoot = inflate.inflate(R.layout.media_controller, null);        initControllerView(mRoot);        return mRoot;    }    private void initControllerView(View v) {        mPauseButton = (ImageButton) v.findViewById(R.id.pause);        if (mPauseButton != null) {            mPauseButton.requestFocus();            mPauseButton.setOnClickListener(mPauseListener);        }        mFullscreenButton = (ImageButton) v.findViewById(R.id.fullscreen);        if (mFullscreenButton != null) {            mFullscreenButton.requestFocus();            mFullscreenButton.setOnClickListener(mFullscreenListener);        }        mFfwdButton = (ImageButton) v.findViewById(R.id.ffwd);        if (mFfwdButton != null) {            mFfwdButton.setOnClickListener(mFfwdListener);            if (!mFromXml) {                mFfwdButton.setVisibility(mUseFastForward ? View.VISIBLE : View.GONE);            }        }        mRewButton = (ImageButton) v.findViewById(R.id.rew);        if (mRewButton != null) {            mRewButton.setOnClickListener(mRewListener);            if (!mFromXml) {                mRewButton.setVisibility(mUseFastForward ? View.VISIBLE : View.GONE);            }        }        // By default these are hidden. They will be enabled when setPrevNextListeners() is called         mNextButton = (ImageButton) v.findViewById(R.id.next);        if (mNextButton != null && !mFromXml && !mListenersSet) {            mNextButton.setVisibility(View.GONE);        }        mPrevButton = (ImageButton) v.findViewById(R.id.prev);        if (mPrevButton != null && !mFromXml && !mListenersSet) {            mPrevButton.setVisibility(View.GONE);        }        mProgress = (ProgressBar) v.findViewById(R.id.mediacontroller_progress);        if (mProgress != null) {            if (mProgress instanceof SeekBar) {                SeekBar seeker = (SeekBar) mProgress;                seeker.setOnSeekBarChangeListener(mSeekListener);            }            mProgress.setMax(1000);        }        mEndTime = (TextView) v.findViewById(R.id.time);        mCurrentTime = (TextView) v.findViewById(R.id.time_current);        mFormatBuilder = new StringBuilder();        mFormatter = new Formatter(mFormatBuilder, Locale.getDefault());        installPrevNextListeners();    }    /**     * Show the controller on screen. It will go away     * automatically after 3 seconds of inactivity.     */    public void show() {        show(sDefaultTimeout);    }    /**     * Disable pause or seek buttons if the stream cannot be paused or seeked.     * This requires the control interface to be a MediaPlayerControlExt     */    private void disableUnsupportedButtons() {        if (mPlayer == null) {            return;        }        try {            if (mPauseButton != null && !mPlayer.canPause()) {                mPauseButton.setEnabled(false);            }            if (mRewButton != null && !mPlayer.canSeekBackward()) {                mRewButton.setEnabled(false);            }            if (mFfwdButton != null && !mPlayer.canSeekForward()) {                mFfwdButton.setEnabled(false);            }        } catch (IncompatibleClassChangeError ex) {            // We were given an old version of the interface, that doesn't have            // the canPause/canSeekXYZ methods. This is OK, it just means we            // assume the media can be paused and seeked, and so we don't disable            // the buttons.        }    }    /**     * Show the controller on screen. It will go away     * automatically after 'timeout' milliseconds of inactivity.     * @param timeout The timeout in milliseconds. Use 0 to show     * the controller until hide() is called.     */    public void show(int timeout) {        if (!mShowing && mAnchor != null) {            setProgress();            if (mPauseButton != null) {                mPauseButton.requestFocus();            }            disableUnsupportedButtons();            FrameLayout.LayoutParams tlp = new FrameLayout.LayoutParams(                ViewGroup.LayoutParams.MATCH_PARENT,                ViewGroup.LayoutParams.WRAP_CONTENT,                Gravity.BOTTOM            );            mAnchor.addView(this, tlp);            mShowing = true;        }        updatePausePlay();        updateFullScreen();        // cause the progress bar to be updated even if mShowing        // was already true.  This happens, for example, if we're        // paused with the progress bar showing the user hits play.        mHandler.sendEmptyMessage(SHOW_PROGRESS);        Message msg = mHandler.obtainMessage(FADE_OUT);        if (timeout != 0) {            mHandler.removeMessages(FADE_OUT);            mHandler.sendMessageDelayed(msg, timeout);        }    }    public boolean isShowing() {        return mShowing;    }    /**     * Remove the controller from the screen.     */    public void hide() {        if (mAnchor == null) {            return;        }        try {            mAnchor.removeView(this);            mHandler.removeMessages(SHOW_PROGRESS);        } catch (IllegalArgumentException ex) {            Log.w("MediaController", "already removed");        }        mShowing = false;    }    private String stringForTime(int timeMs) {        int totalSeconds = timeMs / 1000;        int seconds = totalSeconds % 60;        int minutes = (totalSeconds / 60) % 60;        int hours   = totalSeconds / 3600;        mFormatBuilder.setLength(0);        if (hours > 0) {            return mFormatter.format("%d:%02d:%02d", hours, minutes, seconds).toString();        } else {            return mFormatter.format("%02d:%02d", minutes, seconds).toString();        }    }    private int setProgress() {        if (mPlayer == null || mDragging) {            return 0;        }        int position = mPlayer.getCurrentPosition();        int duration = mPlayer.getDuration();        if (mProgress != null) {            if (duration > 0) {                // use long to avoid overflow                long pos = 1000L * position / duration;                mProgress.setProgress( (int) pos);            }            int percent = mPlayer.getBufferPercentage();            mProgress.setSecondaryProgress(percent * 10);        }        if (mEndTime != null)            mEndTime.setText(stringForTime(duration));        if (mCurrentTime != null)            mCurrentTime.setText(stringForTime(position));        return position;    }    @Override    public boolean onTouchEvent(MotionEvent event) {        show(sDefaultTimeout);        return true;    }    @Override    public boolean onTrackballEvent(MotionEvent ev) {        show(sDefaultTimeout);        return false;    }    @Override    public boolean dispatchKeyEvent(KeyEvent event) {        if (mPlayer == null) {            return true;        }        int keyCode = event.getKeyCode();        final boolean uniqueDown = event.getRepeatCount() == 0                && event.getAction() == KeyEvent.ACTION_DOWN;        if (keyCode ==  KeyEvent.KEYCODE_HEADSETHOOK                || keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE                || keyCode == KeyEvent.KEYCODE_SPACE) {            if (uniqueDown) {                doPauseResume();                show(sDefaultTimeout);                if (mPauseButton != null) {                    mPauseButton.requestFocus();                }            }            return true;        } else if (keyCode == KeyEvent.KEYCODE_MEDIA_PLAY) {            if (uniqueDown && !mPlayer.isPlaying()) {                mPlayer.start();                updatePausePlay();                show(sDefaultTimeout);            }            return true;        } else if (keyCode == KeyEvent.KEYCODE_MEDIA_STOP                || keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE) {            if (uniqueDown && mPlayer.isPlaying()) {                mPlayer.pause();                updatePausePlay();                show(sDefaultTimeout);            }            return true;        } else if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN                || keyCode == KeyEvent.KEYCODE_VOLUME_UP                || keyCode == KeyEvent.KEYCODE_VOLUME_MUTE) {            // don't show the controls for volume adjustment            return super.dispatchKeyEvent(event);        } else if (keyCode == KeyEvent.KEYCODE_BACK || keyCode == KeyEvent.KEYCODE_MENU) {            if (uniqueDown) {                hide();            }            return true;        }        show(sDefaultTimeout);        return super.dispatchKeyEvent(event);    }    private View.OnClickListener mPauseListener = new View.OnClickListener() {        public void onClick(View v) {            doPauseResume();            show(sDefaultTimeout);        }    };    private View.OnClickListener mFullscreenListener = new View.OnClickListener() {        public void onClick(View v) {            doToggleFullscreen();            show(sDefaultTimeout);        }    };    public void updatePausePlay() {        if (mRoot == null || mPauseButton == null || mPlayer == null) {            return;        }        if (mPlayer.isPlaying()) {            mPauseButton.setImageResource(R.drawable.ic_media_pause);        } else {            mPauseButton.setImageResource(R.drawable.ic_media_play);        }    }    public void updateFullScreen() {        if (mRoot == null || mFullscreenButton == null || mPlayer == null) {            return;        }        if (mPlayer.isFullScreen()) {            mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_shrink);        }        else {            mFullscreenButton.setImageResource(R.drawable.ic_media_fullscreen_stretch);        }    }    private void doPauseResume() {        if (mPlayer == null) {            return;        }        if (mPlayer.isPlaying()) {            mPlayer.pause();        } else {            mPlayer.start();        }        updatePausePlay();    }    private void doToggleFullscreen() {        if (mPlayer == null) {            return;        }        mPlayer.toggleFullScreen();    }    // There are two scenarios that can trigger the seekbar listener to trigger:    //    // The first is the user using the touchpad to adjust the posititon of the    // seekbar's thumb. In this case onStartTrackingTouch is called followed by    // a number of onProgressChanged notifications, concluded by onStopTrackingTouch.    // We're setting the field "mDragging" to true for the duration of the dragging    // session to avoid jumps in the position in case of ongoing playback.    //    // The second scenario involves the user operating the scroll ball, in this    // case there WON'T BE onStartTrackingTouch/onStopTrackingTouch notifications,    // we will simply apply the updated position without suspending regular updates.    private OnSeekBarChangeListener mSeekListener = new OnSeekBarChangeListener() {        public void onStartTrackingTouch(SeekBar bar) {            show(3600000);            mDragging = true;            // By removing these pending progress messages we make sure            // that a) we won't update the progress while the user adjusts            // the seekbar and b) once the user is done dragging the thumb            // we will post one of these messages to the queue again and            // this ensures that there will be exactly one message queued up.            mHandler.removeMessages(SHOW_PROGRESS);        }        public void onProgressChanged(SeekBar bar, int progress, boolean fromuser) {            if (mPlayer == null) {                return;            }            if (!fromuser) {                // We're not interested in programmatically generated changes to                // the progress bar's position.                return;            }            long duration = mPlayer.getDuration();            long newposition = (duration * progress) / 1000L;            mPlayer.seekTo( (int) newposition);            if (mCurrentTime != null)                mCurrentTime.setText(stringForTime( (int) newposition));        }        public void onStopTrackingTouch(SeekBar bar) {            mDragging = false;            setProgress();            updatePausePlay();            show(sDefaultTimeout);            // Ensure that progress is properly updated in the future,            // the call to show() does not guarantee this because it is a            // no-op if we are already showing.            mHandler.sendEmptyMessage(SHOW_PROGRESS);        }    };    @Override    public void setEnabled(boolean enabled) {        if (mPauseButton != null) {            mPauseButton.setEnabled(enabled);        }        if (mFfwdButton != null) {            mFfwdButton.setEnabled(enabled);        }        if (mRewButton != null) {            mRewButton.setEnabled(enabled);        }        if (mNextButton != null) {            mNextButton.setEnabled(enabled && mNextListener != null);        }        if (mPrevButton != null) {            mPrevButton.setEnabled(enabled && mPrevListener != null);        }        if (mProgress != null) {            mProgress.setEnabled(enabled);        }        disableUnsupportedButtons();        super.setEnabled(enabled);    }    @Override    public void onInitializeAccessibilityEvent(AccessibilityEvent event) {        super.onInitializeAccessibilityEvent(event);        event.setClassName(VideoControllerView.class.getName());    }    @Override    public void onInitializeAccessibilityNodeInfo(AccessibilityNodeInfo info) {        super.onInitializeAccessibilityNodeInfo(info);        info.setClassName(VideoControllerView.class.getName());    }    private View.OnClickListener mRewListener = new View.OnClickListener() {        public void onClick(View v) {            if (mPlayer == null) {                return;            }            int pos = mPlayer.getCurrentPosition();            pos -= 5000; // milliseconds            mPlayer.seekTo(pos);            setProgress();            show(sDefaultTimeout);        }    };    private View.OnClickListener mFfwdListener = new View.OnClickListener() {        public void onClick(View v) {            if (mPlayer == null) {                return;            }            int pos = mPlayer.getCurrentPosition();            pos += 15000; // milliseconds            mPlayer.seekTo(pos);            setProgress();            show(sDefaultTimeout);        }    };    private void installPrevNextListeners() {        if (mNextButton != null) {            mNextButton.setOnClickListener(mNextListener);            mNextButton.setEnabled(mNextListener != null);        }        if (mPrevButton != null) {            mPrevButton.setOnClickListener(mPrevListener);            mPrevButton.setEnabled(mPrevListener != null);        }    }    public void setPrevNextListeners(View.OnClickListener next, View.OnClickListener prev) {        mNextListener = next;        mPrevListener = prev;        mListenersSet = true;        if (mRoot != null) {            installPrevNextListeners();            if (mNextButton != null && !mFromXml) {                mNextButton.setVisibility(View.VISIBLE);            }            if (mPrevButton != null && !mFromXml) {                mPrevButton.setVisibility(View.VISIBLE);            }        }    }    public interface MediaPlayerControl {        void    start();        void    pause();        int     getDuration();        int     getCurrentPosition();        void    seekTo(int pos);        boolean isPlaying();        int     getBufferPercentage();        boolean canPause();        boolean canSeekBackward();        boolean canSeekForward();        boolean isFullScreen();        void    toggleFullScreen();    }    private static class MessageHandler extends Handler {        private final WeakReference<VideoControllerView> mView;         MessageHandler(VideoControllerView view) {            mView = new WeakReference<VideoControllerView>(view);        }        @Override        public void handleMessage(Message msg) {            VideoControllerView view = mView.get();            if (view == null || view.mPlayer == null) {                return;            }            int pos;            switch (msg.what) {                case FADE_OUT:                    view.hide();                    break;                case SHOW_PROGRESS:                    pos = view.setProgress();                    if (!view.mDragging && view.mShowing && view.mPlayer.isPlaying()) {                        msg = obtainMessage(SHOW_PROGRESS);                        sendMessageDelayed(msg, 1000 - (pos % 1000));                    }                    break;            }        }    }}

修改后的VideoView ,主要时要将如下方法进行修改,适配我们重写的MediaController

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

对应布局中,应该用FrameLayout包含VideoView

    <FrameLayout        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:layout_centerInParent="true">        <your.package.name.VideoControllerView            android:id="@+id/video_view"            android:layout_width="match_parent"            android:layout_height="wrap_content"/>    </FrameLayout>