Android中实现Webview顶部带进度条的方法

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文章链接：http://www.jb51.net/article/59979.htm

java代码：

package com.droidyue.demo.webviewprogressbar;import android.app.Activity;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.webkit.WebChromeClient;import android.webkit.WebView;import android.widget.ProgressBar;import com.droidyue.demo.webviewprogressbar.R;public class MainActivity extends Activity {  @Override  protected void onCreate(Bundle savedInstanceState) {      super.onCreate(savedInstanceState);      setContentView(R.layout.activity_main);      final ProgressBar bar = (ProgressBar)findViewById(R.id.myProgressBar);      final WebView webView = (WebView)findViewById(R.id.myWebView);      webView.setWebChromeClient(new WebChromeClient() {          @Override          public void onProgressChanged(WebView view, int newProgress) {              if (newProgress == 100) {                  bar.setVisibility(View.INVISIBLE);              } else {                  if (View.INVISIBLE == bar.getVisibility()) {                      bar.setVisibility(View.VISIBLE);                  }                  bar.setProgress(newProgress);              }              super.onProgressChanged(view, newProgress);          }      });      findViewById(R.id.myButton).setOnClickListener(new OnClickListener() {          @Override          public void onClick(View arg0) {              webView.reload();          }      });      final String url = "http://jb51.net";      webView.loadUrl(url);  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {      getMenuInflater().inflate(R.menu.main, menu);      return true;  }}

布局文件代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Button        android:id="@+id/myButton"        android:layout_width="match_parent"        android:layout_height="wrap_content"        android:text="Reload"        />    <ProgressBar      style="?android:attr/progressBarStyleHorizontal"        android:id="@+id/myProgressBar"        android:layout_below="@id/myButton"        android:layout_width="match_parent"        android:layout_height="5px"        />  <WebView      android:id="@+id/myWebView"      android:layout_below="@id/myProgressBar"      android:layout_width="match_parent"      android:layout_height="match_parent"      /></RelativeLayout>

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