自定义MediaController来实现修改底部布局作以及实现vedioview半屏与全屏的切换

因为直接使用系统vedioview，底部的MediaController布局有点不好看，尤其是进度条，不能实现办半屏与全屏的切换，自己网上看了下别人的资料，整理了下，做以笔记；初学者，勉强才实现这些功能，还有许多地方不明白。

看下效果：

                  

1，MediaController.java.直接复制下系统源码的MediaController，来进行修改，就两个地方，一个布局相关的修改，以及进度条ProgressBar的修改，然后就 是添加了半屏与全屏的切换接口。

/*
 * 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  com.example.vedioviewcompat;

import java.util.Formatter;
import java.util.Locale;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.PixelFormat;
import android.media.AudioManager;
import android.os.Build;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
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.Window;
import android.view.WindowManager;
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;

/**
 * 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>
 */
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class MediaController extends FrameLayout {

    private MediaPlayerControl  mPlayer;
    private Context             mContext;
    private View                mAnchor;
    private View                mRoot;
    private WindowManager       mWindowManager;
    private Window              mWindow;
    private View                mDecor;
    private WindowManager.LayoutParams mDecorLayoutParams;
    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;
    onClickIsFullScreenListener clickIsFullScreenListener;
    StringBuilder               mFormatBuilder;
    Formatter                   mFormatter;
    private ImageButton         mPauseButton;
    private ImageButton         mFfwdButton;
    private ImageButton         mRewButton;
    private ImageButton         mNextButton;
    private ImageButton         mPrevButton;

    public MediaController(Context context, AttributeSet attrs) {
        super(context, attrs);
        mRoot = this;
        mContext = context;
        mUseFastForward = true;
        mFromXml = true;
    }

    @Override
    public void onFinishInflate() {
        if (mRoot != null)
            initControllerView(mRoot);
    }

    public MediaController(Context context, boolean useFastForward) {
        super(context);
        mContext = context;
        mUseFastForward = useFastForward;
        initFloatingWindowLayout();
        initFloatingWindow();
    }

    public MediaController(Context context) {
        this(context, true);
    }

	private void initFloatingWindow() {
        mWindowManager = (WindowManager)mContext.getSystemService(Context.WINDOW_SERVICE);
        //这里得注意下，使用PolicyCompat替换原来的
        mWindow = PolicyCompat.createWindow(mContext);
        mWindow.setWindowManager(mWindowManager, null, null);
        mWindow.requestFeature(Window.FEATURE_NO_TITLE);
        mDecor = mWindow.getDecorView();
        mDecor.setOnTouchListener(mTouchListener);
        mWindow.setContentView(this);
        mWindow.setBackgroundDrawableResource(android.R.color.transparent);
        
        // While the media controller is up, the volume control keys should
        // affect the media stream type
        mWindow.setVolumeControlStream(AudioManager.STREAM_MUSIC);

        setFocusable(true);
        setFocusableInTouchMode(true);
        setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);
        requestFocus();
    }

    // Allocate and initialize the static parts of mDecorLayoutParams. Must
    // also call updateFloatingWindowLayout() to fill in the dynamic parts
    // (y and width) before mDecorLayoutParams can be used.
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
	private void initFloatingWindowLayout() {
        mDecorLayoutParams = new WindowManager.LayoutParams();
        WindowManager.LayoutParams p = mDecorLayoutParams;
        p.gravity = Gravity.TOP | Gravity.LEFT;
        p.height = LayoutParams.WRAP_CONTENT;
        p.x = 0;
        p.format = PixelFormat.TRANSLUCENT;
        p.type = WindowManager.LayoutParams.TYPE_APPLICATION_PANEL;
        p.flags |= WindowManager.LayoutParams.FLAG_ALT_FOCUSABLE_IM
                | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
                | WindowManager.LayoutParams.FLAG_SPLIT_TOUCH;
        p.token = null;
        p.windowAnimations = 0; // android.R.style.DropDownAnimationDown;
    }

    // Update the dynamic parts of mDecorLayoutParams
    // Must be called with mAnchor != NULL.
    private void updateFloatingWindowLayout() {
        int [] anchorPos = new int[2];
        mAnchor.getLocationOnScreen(anchorPos);

        // we need to know the size of the controller so we can properly position it
        // within its space
        mDecor.measure(MeasureSpec.makeMeasureSpec(mAnchor.getWidth(), MeasureSpec.AT_MOST),
                MeasureSpec.makeMeasureSpec(mAnchor.getHeight(), MeasureSpec.AT_MOST));

        WindowManager.LayoutParams p = mDecorLayoutParams;
        p.width = mAnchor.getWidth();
        p.x = anchorPos[0] + (mAnchor.getWidth() - p.width) / 2;
        p.y = anchorPos[1] + mAnchor.getHeight() - mDecor.getMeasuredHeight();
    }

    // This is called whenever mAnchor's layout bound changes
    private OnLayoutChangeListener mLayoutChangeListener =
    		(VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB) ?
            new OnLayoutChangeListener() {
		        public void onLayoutChange(View v, int left, int top, int right,
		                int bottom, int oldLeft, int oldTop, int oldRight,
		                int oldBottom) {
		            updateFloatingWindowLayout();
		            if (mShowing) {
		                mWindowManager.updateViewLayout(mDecor, mDecorLayoutParams);
		            }
		        }
		    } :
    		null;
    
    private OnTouchListener mTouchListener = new OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                if (mShowing) {
                    hide();
                }
            }
            return false;
        }
    };
	private ImageButton mIsFullScreen;
    
    public void setMediaPlayer(MediaPlayerControl player) {
        mPlayer = player;
        updatePausePlay();
    }

    /**
     * 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.
     * When VideoView calls this method, it will use the VideoView's parent
     * as the anchor.
     * @param view The view to which to anchor the controller when it is visible.
     */
    @TargetApi(Build.VERSION_CODES.HONEYCOMB)
	public void setAnchorView(View view) {
    	boolean hasOnLayoutChangeListener = (VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB);
    	
        if (hasOnLayoutChangeListener && mAnchor != null) {
            mAnchor.removeOnLayoutChangeListener(mLayoutChangeListener);
        }
        mAnchor = view;
        if (hasOnLayoutChangeListener && mAnchor != null) {
            mAnchor.addOnLayoutChangeListener(mLayoutChangeListener);
        }

        FrameLayout.LayoutParams frameParams = new FrameLayout.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT
        );

        removeAllViews();
        //在这里更改底部布局，以及获取相应控件对象，进行操作，
        //建议原布局中控件类型和名字不要改，免得在这里又得修改，保证原功能完整
        //需要添加的控件，添加后做相应处理
        mRoot = makeControllerView();
        initControllerView(mRoot);
        addView(mRoot, 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() {
    	//MediaControllerd 布局
        LayoutInflater inflate = LayoutInflater.from(getContext());
        return inflate.inflate(R.layout.media_controller, null);
    }

    private void initControllerView(View v) {
        mPauseButton = (ImageButton) v.findViewById(R.id.pause);
        if (mPauseButton != null) {
            mPauseButton.requestFocus();
            mPauseButton.setOnClickListener(mPauseListener);
        }

        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 (!