Webview常用的方法

package com.bwie.test.wzq_0818day15;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class SecondActivity extends AppCompatActivity {

private WebView wb;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);
    wb = (WebView) findViewById(R.id.web);

    WebSettings webSettings = wb.getSettings();

    //设置可以访问文件
    webSettings.setAllowFileAccess(true);
    //设置支持缩放
    webSettings.setBuiltInZoomControls(true);
    webSettings.setJavaScriptEnabled(true);
    //设置Web视图
    wb.setWebViewClient(new webViewClient ());

    //加载数据
    wb.loadUrl("https://www.baidu.com/");
}
@Override
//设置回退
//覆盖Activity类的onKeyDown(int keyCoder,KeyEvent event)方法
public boolean onKeyDown(int keyCode, KeyEvent event) {
    if ((keyCode == KeyEvent.KEYCODE_BACK) && wb.canGoBack()) {
        wb.goBack(); //goBack()表示返回WebView的上一页面
        return true;
    }
    finish();//结束退出程序
    return false;
}

//Web视图
private class webViewClient extends WebViewClient {
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        view.loadUrl(url);
        return true;
    }
}

}