Android WebView 使用方法，可以解决web视频播放层级问题。

package com.zhong.doule;import android.annotation.SuppressLint;import android.content.Intent;import android.graphics.Bitmap;import android.net.Uri;import android.os.Build;import android.os.Bundle;import android.support.v7.app.AppCompatActivity;import android.util.Log;import android.view.KeyEvent;import android.view.View;import android.view.ViewGroup;import android.webkit.WebResourceError;import android.webkit.WebResourceRequest;import android.webkit.WebSettings;import android.webkit.WebView;import android.webkit.WebViewClient;import android.widget.LinearLayout;import android.widget.RelativeLayout;import com.wang.avi.AVLoadingIndicatorView;public class MainActivity extends AppCompatActivity {    private WebView web;    private View mErrorView; //加载错误的视图    private RelativeLayout mRlLoading;    private AVLoadingIndicatorView mAvView;    @SuppressLint("ResourceAsColor")    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        web = findViewById(R.id.webView);        mRlLoading = findViewById(R.id.rl_loading);        mAvView = findViewById(R.id.avi);        web.setBackgroundColor(android.R.color.transparent);        // web.setBackgroundResource(R.mipmap.ic_bg);        initView();    }    protected void initView() {        initErrorPage();        WebSettings webSettings = web.getSettings();        webSettings.setJavaScriptEnabled(true);//是否允许JavaScript脚本运行，默认为false        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);//设置js可以直接打开窗口，如window.open()，默认为false        webSettings.setSupportZoom(true);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {            webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_ALWAYS_ALLOW);        }        webSettings.setMediaPlaybackRequiresUserGesture(true);        webSettings.setPluginState(WebSettings.PluginState.ON);        webSettings.setUseWideViewPort(true); // 关键点        webSettings.setAllowFileAccess(true); // 允许访问文件        webSettings.setJavaScriptCanOpenWindowsAutomatically(true);        webSettings.setCacheMode(WebSettings.LOAD_DEFAULT);        webSettings.setGeolocationEnabled(true);        webSettings.setDomStorageEnabled(true);//开启本地DOM存储        webSettings.setDatabaseEnabled(true);        webSettings.setLoadWithOverviewMode(true);        webSettings.setPluginState(WebSettings.PluginState.ON);        webSettings.setCacheMode(WebSettings.LOAD_NO_CACHE); // 不加载缓存内容        // 特别注意        // 每个 Application 只调用一次 WebSettings.setAppCachePath() 和   webSettings.setAppCacheMaxSize();        String cacheDirPath = MainActivity.this.getFilesDir().getAbsolutePath() + "cache/";        webSettings.setAppCachePath(cacheDirPath);        // 1. 设置缓存路径        webSettings.setAppCacheMaxSize(20 * 1024 * 1024);        // 2. 设置缓存大小        webSettings.setAppCacheEnabled(true);        // 3. 开启Application Cache存储机制        /*web.setWebViewClient(new WebViewClient() {            //覆盖shouldOverrideUrlLoading 方法            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                if (url.startsWith("http:") || url.startsWith("https:")) {                    view.loadUrl(url);                    return false;                } else {                    try {                        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));                        startActivity(intent);                    }catch (Exception e){//防止crash (如果手机上没有安装处理某个scheme开头的url的APP, 会导致crash)                        e.printStackTrace();                        LogUtil.i("网页错误");                        return true;//没有安装该app时，返回true，表示拦截自定义链接，但不跳转，避免弹出上面的错误页面                    }                    return true;                }            }        });*/        web.setWebViewClient(new WebViewClient() {            @Override            public boolean shouldOverrideUrlLoading(WebView view, String url) {                if (url.startsWith("http:") || url.startsWith("https:")) {                    view.loadUrl(url);                    return false;                } else {                    try {                        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));                        startActivity(intent);                    } catch (Exception e) {//防止crash (如果手机上没有安装处理某个scheme开头的url的APP, 会导致crash)                        e.printStackTrace();                        Log.i("MainActivity", "网页错误");                        return true;//没有安装该app时，返回true，表示拦截自定义链接，但不跳转，避免弹出上面的错误页面                    }                    return true;                }            }            public void onPageStarted(WebView view, String url, Bitmap favicon) {                if (MainActivity.this.isFinishing()) {                    return;                }                Log.i("MainActivity", "onPageStarted");                web.getSettings().setBlockNetworkImage(true);                //((BaseActivity) mActivity).showLoading(false);            }            @Override            public void onPageFinished(WebView view, String url) {                if (MainActivity.this.isFinishing()) {                    return;                }                Log.i("MainActivity", "onPageFinished");                web.getSettings().setBlockNetworkImage(false);                //web.setVisibility(View.VISIBLE);                /// ((BaseActivity) mActivity).dismissLoading();                mAvView.hide();                mRlLoading.setVisibility(View.GONE);            }            @Override            public void onReceivedError(WebView view, WebResourceRequest request, WebResourceError error) {                super.onReceivedError(view, request, error);                Log.i("MainActivity", "onReceivedError: ");                mAvView.hide();                mRlLoading.setVisibility(View.GONE);                showErrorPage();//显示错误页面            }        });        //方式1 webview        web.setOnKeyListener(new View.OnKeyListener() {            @Override            public boolean onKey(View v, int keyCode, KeyEvent event) {                if (event.getAction() == KeyEvent.ACTION_DOWN) {                    if (keyCode == KeyEvent.KEYCODE_BACK && web.canGoBack()) {  //表示按返回键                        web.goBack();   //后退                        return true;    //已处理                    }                }                return false;            }        });        //  web.loadUrl("https://m3ws.kugou.com/rank/info/23784");        web.loadUrl("http://47.74.230.207/#/login");    }    /***     * 显示加载失败时自定义的网页     */    private void initErrorPage() {        if (mErrorView == null) {            mErrorView = View.inflate(MainActivity.this, R.layout.view_web_error, null);            mErrorView.setOnClickListener(new View.OnClickListener() {                @Override                public void onClick(View v) {                    try {                        web.removeView(mErrorView); //添加自定义的错误提示的View                        web.loadUrl("http://47.74.230.207/#/login");                    } catch (Exception e) {                        e.printStackTrace();                    }                }            });        }    }    /**     * 显示自定义错误提示页面，用一个View覆盖在WebView     */    private void showErrorPage() {        web.removeAllViews(); //移除加载网页错误时，默认的提示信息        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);        web.addView(mErrorView, 0, layoutParams); //添加自定义的错误提示的View    }    /**     * 显示自定义错误提示页面，用一个View覆盖在WebView     */    private void dismissErrorPage() {//        web.removeAllViews(); //移除加载网页错误时，默认的提示信息//        LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.MATCH_PARENT);    }    @Override    protected void onDestroy() {        super.onDestroy();        if (web != null) {            // 如果先调用destroy()方法，则会命中if (isDestroyed()) return;这一行代码，需要先onDetachedFromWindow()，再            // destory()            ViewParent parent = web.getParent();            if (parent != null) {                ((ViewGroup) parent).removeView(web);            }            web.stopLoading();            // 退出时调用此方法，移除绑定的服务，否则某些特定系统会报错            web.getSettings().setJavaScriptEnabled(false);            web.clearHistory();            web.clearView();            web.removeAllViews();            web.destroy();            web=null;        }    }}
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