android中自定义WebView显示网页或本地html文件，2020年android面试题

自定义带进度条的WebView控件：

package app.ui.widget
;

import android.content.Context;

import android.util.AttributeSet;

import android.webkit.WebView;

import android.widget.ProgressBar;

/**

• 自定义WebView带进度条

• @author gaochun

*/

@SuppressWarnings(“deprecation”)

public class ProgressWebView extends WebView {

private ProgressBar progressbar; /** 进度条 */

public ProgressWebView(Context context, AttributeSet attrs) {

super(context, attrs);

// 初始化进度条

progressbar = new ProgressBar(context, null, android.R.attr.progressBarStyleHorizontal);

// 设置进度条风格

progressbar.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, 5, 0, 0));

addView(progressbar);

setWebChromeClient(new WebChromeClient());

}

public class WebChromeClient extends android.webkit.WebChromeClient {

@Override

public void onProgressChanged(WebView view, int newProgress) {

if (newProgress == 100) {

progressbar.setVisibility(GONE); // 加载完成隐藏进度条

} else {

if (progressbar.getVisibility() == GONE)

progressbar.setVisibility(VISIBLE);

progressbar.setProgress(newProgress);

}

super.onProgressChanged(view, newProgress);

}

}

@Override

protected void onScrollChanged(int l, int t, int oldl, int oldt) {

LayoutParams lp = (LayoutParams) progressbar.getLayoutParams();

lp.x = l;

lp.y = t;

progressbar.setLayoutParams(lp);

super.onScrollChanged(l, t, oldl, oldt);

}

}

在xml中使用：

<?xml version=”1.0″ encoding=”utf-8″?>

<FrameLayout xmlns:android=“http://schemas.android.com/apk/res/android”

android:layout_width=“match_parent”

android:layout_height=“match_parent”

android:padding=”@dimen/content_padding” >

<app.ui.widget.ProgressWebView

android:id=”@+id/webview“

android:layout_width=“match_parent”

android:layout_height=“match_parent” />

<TextView

android:id=”@+id/tv_error“

android:layout_width=“match_parent”

android:layout_height=“match_parent”

android:gravity=“center|center_vertical”

android:text=“查询失败”

android:visibility=“gone” />

在Activity中使用：

/*******************************************************************************

• Copyright © Weaver Info Tech Co. Ltd

• SelectActivity

• app.ui.activity.service.SelectActivity.java

• TODO: File description or class description.

• @author: Administrator

• @since: 2014-5-16

• @version: 1.0.0

• @changeLogs:

• 1.0.0: First created this class.
  

******************************************************************************/

package app.ui.activity.service;

import mobi.kuaidian.qunakao.R;

import android.content.Intent;

import android.os.Bundle;

import android.view.KeyEvent;

import android.webkit.WebSettings;

import android.webkit.WebView;

tivity.service;

import mobi.kuaidian.qunakao.R;

import android.content.Intent;

import android.os.Bundle;

import android.view.KeyEvent;

import android.webkit.WebSettings;

import android.webkit.WebView;

代码007普通

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