android开发之音视频(二)

转载请标明出处：
http://blog.youkuaiyun.com/AnalyzeSystem/article/details/79311530
本文出自Analyzesystem的博客

我且把视频开发大致分为视频显示控件和音视频控制控件、弹窗控件

• MediaPlayer

• MediaController

• Popu

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height="230" width="130" src="https://img-blog.youkuaiyun.com/20180211163401355?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvQW5hbHl6ZVN5c3RlbQ==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/SouthEast">

播放器MediaPlayer可以理解为一个容器，容纳多种布局，这里布局按照16：9的比例显示画面，摆在博主面前的第一个难题出现了，如何实现小屏和全屏的无缝切换？网上有诸多方案并不能令博主满意，最后在几经尝试以及一位博友提示下想到了一个方案

修改MediaPlayer onMeasure函数，根据不同的模式动态requestLayout 动态调整控件宽高，同时回调函数通知隐藏状态栏和标题栏（不一定是标题栏，所以回调函数自己控制）

Tip:
一定要注意修改manifest文件 android:configChanges="screenSize|keyboardHidden|orientation"，这样横竖屏切换不会走生命周期，只会changed回调

下面是伪类代码块

package idea.analyzesystem.ijkplayer.widget;

import android.content.Context;
import android.graphics.Point;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowManager;
import android.widget.FrameLayout;

import idea.analyzesystem.ijkplayer.interfaces.MediaPlayerListener;

/**
 * Created by idea on 2018/2/11.
 */
public class MediaPlayer extends FrameLayout implements View.OnClickListener{

    private final Point screenPoint;

    public static final int MODE_LANDSCAPE = 0;

    public static final int MODE_PORTRAITSCREEN = 1;

    private int mode = MODE_PORTRAITSCREEN;

    public int getMode() {
        return mode;
    }

    /**
     *  MODE_LANDSCAPE 、MODE_PORTRAITSCREEN
     * @param mode
     */
    public void setMode(int mode) {
        if(this.mode!=mode){
            this.mode = mode;
            switch (getMode()){
                case MODE_LANDSCAPE:
                    if(getScreenChangedListener()!=null){
                        getScreenChangedListener().onLandScape();
                    }
                    requestLayout();
                    break;

                case MODE_PORTRAITSCREEN:
                    if(getScreenChangedListener()!=null){
                        getScreenChangedListener().onPortailScreen();
                    }
                    requestLayout();
                    break;
            }
        }

    }

    public MediaPlayer(Context context) {
        this(context,null,0);
    }

    public MediaPlayer(Context context, AttributeSet attrs) {
        this(context, attrs,0);
    }

    public MediaPlayer(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);

        WindowManager windowManager = (WindowManager)context.getSystemService(Context.WINDOW_SERVICE);
        screenPoint = new Point();
        windowManager.getDefaultDisplay().getSize(screenPoint);

        setOnClickListener(this);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);

        switch (getMode()){
            case MODE_LANDSCAPE:
                setMeasuredDimension(screenPoint.y,screenPoint.x);
                break;

            case MODE_PORTRAITSCREEN:

                setMeasuredDimension(screenPoint.x,screenPoint.x/16*9);
                break;
        }
    }


    @Override
    public void onClick(View v) {
    }

    /************************************Listener*********************************/

    private MediaPlayerListener.ScreenChangedListener screenChangedListener;

    public MediaPlayerListener.ScreenChangedListener getScreenChangedListener() {
        return screenChangedListener;
    }

    public void setScreenChangedListener(MediaPlayerListener.ScreenChangedListener screenChangedListener) {
        this.screenChangedListener = screenChangedListener;
    }
}

播放界面伪代码块

@Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ideaMediaPlayer.setScreenChangedListener(this);
}

@Override
public void onLandScape() {
        titleView.setVisibility(View.GONE);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
}

@Override
public void onPortailScreen() {
        titleView.setVisibility(View.VISIBLE);
        getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
}

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第一个知识点，如何实现小屏、全屏无缝切换