WebView中播放视频，全屏的适配

Android中WebView的Bug很多，今天总结下加载WebView中视频，用户点击全屏按钮无法全屏的适配。
正常情况下，用户点击全屏按钮，我们进入一个视频的横屏的全屏状态。

网页点击全屏按钮会触发WebChromeClient的onShowCustomView方法，全屏后缩回来会触发onHideCustomView方法，So我们只需要在这两个方法中处理就行了。

1.我们定义一个接口，接口中有上面两个方法

package com.wj.webviewvideo.webview;

import android.view.View;
import android.webkit.WebChromeClient;

public interface IVideo {

    void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback);


    void onHideCustomView();


    boolean isVideoState();
}

2.接口的实现类，核心！

package com.wj.webviewvideo.webview;

import android.app.Activity;
import android.content.pm.ActivityInfo;
import android.graphics.Color;
import android.os.Build;
import android.util.Pair;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.widget.FrameLayout;

import java.util.HashSet;
import java.util.Set;

public class VideoImpl implements IVideo, EventInterceptor {

    private Activity mActivity;
    private WebView mWebView;
    private static final String TAG = VideoImpl.class.getSimpleName();
    private Set<Pair<Integer, Integer>> mFlags = null;
    private View mMoiveView = null;
    private ViewGroup mMoiveParentView = null;
    private WebChromeClient.CustomViewCallback mCallback;

    public VideoImpl(Activity mActivity, WebView webView) {
        this.mActivity = mActivity;
        this.mWebView = webView;
        mFlags = new HashSet<>();

    }


    @Override
    public void onShowCustomView(View view, WebChromeClient.CustomViewCallback callback) {


        Activity mActivity;
        if ((mActivity = this.mActivity) == null || mActivity.isFinishing()) {
            return;
        }
        mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);


        Window mWindow = mActivity.getWindow();
        Pair<Integer, Integer> mPair = null;
        // 保存当前屏幕的状态
        if ((mWindow.getAttributes().flags & WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON) == 0) {
            mPair = new Pair<>(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, 0);
            mWindow.setFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON, WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
            mFlags.add(mPair);
        }

        if ((Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) && (mWindow.getAttributes().flags & WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED) == 0) {
            mPair = new Pair<>(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED, 0);
            mWindow.setFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED, WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
            mFlags.add(mPair);
        }


        if (mMoiveView != null) {
            callback.onCustomViewHidden();
            return;
        }

        if (mWebView != null) {
            mWebView.setVisibility(View.GONE);
        }

        if (mMoiveParentView == null) {
            FrameLayout mDecorView = (FrameLayout) mActivity.getWindow().getDecorView();
            mMoiveParentView = new FrameLayout(mActivity);
            mMoiveParentView.setBackgroundColor(Color.BLACK);
            mDecorView.addView(mMoiveParentView);
        }
        this.mCallback = callback;
        mMoiveParentView.addView(this.mMoiveView = view);
        mMoiveParentView.setVisibility(View.VISIBLE);

    }

    @Override
    public void onHideCustomView() {

        if (mMoiveView == null) {
            return;
        }
        if (mActivity != null && mActivity.getRequestedOrientation() != ActivityInfo.SCREEN_ORIENTATION_PORTRAIT) {
            mActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        }

        if (!mFlags.isEmpty()) {
            for (Pair<Integer, Integer> mPair : mFlags) {
                mActivity.getWindow().setFlags(mPair.second, mPair.first);
            }
            mFlags.clear();
        }

        mMoiveView.setVisibility(View.GONE);
        if (mMoiveParentView != null && mMoiveView != null) {
            mMoiveParentView.removeView(mMoiveView);

        }
        if (mMoiveParentView != null) {
            mMoiveParentView.setVisibility(View.GONE);
        }

        if (this.mCallback != null) {
            mCallback.onCustomViewHidden();
        }
        this.mMoiveView = null;
        if (mWebView != null) {
            mWebView.setVisibility(View.VISIBLE);
        }

    }

    @Override
    public boolean isVideoState() {
        return mMoiveView != null;
    }

    @Override
    public boolean event() {

        if (isVideoState()) {
            onHideCustomView();
            return true;
        } else {
            return false;
        }

    }
}

EventInterceptor这个是一个接口

package com.wj.webviewvideo.webview;

public interface EventInterceptor {

    boolean event();
}

3.封装一个核心BaseWebChromeClient方便以后的WebView的适配

package com.wj.webviewvideo.webview;

import android.view.View;
import android.webkit.WebChromeClient;

public class BaseWebChromeClient extends WebChromeClient {

    private IVideo mIVideo;

    public BaseWebChromeClient(IVideo mIVideo) {
        this.mIVideo = mIVideo;
    }

    @Override
    public void onShowCustomView(View view, CustomViewCallback callback) {
        if (mIVideo != null) {
            mIVideo.onShowCustomView(view, callback);
        }

    }

    @Override
    public void onHideCustomView() {
        if (mIVideo != null) {
            mIVideo.onHideCustomView();
        }
    }

}

4.调用，并且适配一下Acitivity

给你WebView所在Acitivity的清单文件中添加以下属性，

android:configChanges="orientation|screenSize"
android:hardwareAccelerated="true"

调用其实很简单给WebView设置WebChromeClient就行了

package com.wj.webviewvideo;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;

import com.wj.webviewvideo.webview.BaseWebChromeClient;
import com.wj.webviewvideo.webview.VideoImpl;

public class SecondActivity extends AppCompatActivity {

    private WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_second);

        webView = findViewById(R.id.webview);

        WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setUseWideViewPort(true);

        webView.setWebChromeClient(new BaseWebChromeClient(new VideoImpl(this, webView)));
        webView.loadUrl(MainActivity.WEB_URL);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (webView != null)
            webView.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
        if (webView != null)
            webView.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        if (webView != null)
            webView.destroy();
    }
}

上面的代码参考的AgentWeb,大致的原理就是全屏时，吧手机横屏WebView放在最上方。