使用webView中遇到的坑。一些属性设置，和替换成企鹅的X5内核

吐槽原生WebView，不友好。

先贴代码吧

activity_main.xml:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.www.test.MainActivity">

    <com.tencent.smtt.sdk.WebView
        android:id="@+id/web_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

MainActivity.java

package com.example.www.test;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.KeyEvent;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;

import com.tencent.smtt.sdk.QbSdk;
import com.tencent.smtt.sdk.WebSettings;
import com.tencent.smtt.sdk.WebView;
import com.tencent.smtt.sdk.WebViewClient;

public class MainActivity extends Activity {

    public WebView webView;

    //定义一个变量，来标识是否退出
    private static boolean isExit = false;

    //webView要加载的网址
    public String url = "http://www.baidu.com/";


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        //去掉activity标题栏
        requestWindowFeature(Window.FEATURE_NO_TITLE);

        //去掉Android上方信息栏（运营商，信号，时间等信息的那一栏）
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);

        setContentView(R.layout.activity_main);
        webView = findViewById(R.id.web_view);

        //X5内核回调接口
        QbSdk.PreInitCallback cb = new QbSdk.PreInitCallback() {

            @Override
            public void onCoreInitFinished() {

            }

            @Override
            public void onViewInitFinished(boolean b) {
                Log.d("app", "onViewInitFinished is " + b);
            }
        };

        //X5内核初始化接口
        QbSdk.initX5Environment(getApplicationContext(), cb);

        //WebSettings
        WebSettings webSettings = webView.getSettings();

        //缓存
        //允许加载JS
        webSettings.setJavaScriptEnabled(true);

        //DOM缓存
        webSettings.setDomStorageEnabled(true);

        //cache缓存
        webSettings.setAppCacheEnabled(false);

        //webView中访问内容URL，默认true
        webSettings.setAllowContentAccess(true);

        //自适应屏幕，超出宽度时，会缩小适应屏幕
        webSettings.setLoadWithOverviewMode(true);

        //强行使用WebView打开网址，禁止跳转到手机自带浏览器打开
        webView.setWebViewClient(new WebViewClient() {
            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                //webView自己加载URL，然后通知系统不需要HandleURL
                view.loadUrl(url);
                return true;
            }
        });


        getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_ADJUST_RESIZE |
                WindowManager.LayoutParams.SOFT_INPUT_STATE_HIDDEN);
    }

    @Override
    protected void onStart() {
        super.onStart();
        //新线程中运行
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                webView.loadUrl(url);
            }
        });
    }

    /**
     * onCreate()
     * onStart()
     * onRestart()
     * onResume()
     * onPause()
     * onStop()
     * onDestroy() 
     * 为Activity生命周期
     **/

    @Override
    protected void onRestart() {
        super.onRestart();
    }

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    protected void onPause() {
        super.onPause();
    }

    @Override
    protected void onStop() {
        super.onStop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    //返回键监听
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            exit();
            return false;
        }
        return super.onKeyDown(keyCode, event);
    }

    private void exit() {
        if (!isExit) {
            isExit = true;
            Toast.makeText(MainActivity.this, "再按一次 退出程序", Toast.LENGTH_SHORT).show();
            mHandler.sendEmptyMessageDelayed(0, 1000);
        } else {
            finish();
            System.exit(0);
        }
    }

    Handler mHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            isExit = false;
        }
    };

}

代码涉及到的内容有

1.去掉activity标题栏

2.去掉activity信息栏

3.X5浏览器内核Demo（官方地址：https://x5.tencent.com/tbs/guide/sdkInit.html ）

4.webView的一些webSettings设置

5.禁止webView跳转到手机自带浏览器

6.返回键监听

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