WebView添加进度条

摘要: WebView加载数据头部显示加载进度条，只需要在布局文件头部添加progressBar 如果我们包括ProgressBar然后让它看不见或当页面加载完成
——如果我们显示ProgressDialog然后把它当页面加载完成。

1，先看一下activity代码 ：

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.view.KeyEvent;
import android.view.View;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

/*
*
*/
public class WebViewClientDemoActivity extends Activity {
/** Called when the activity is first created. */

WebView web;
ProgressBar progressBar;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

web = (WebView) findViewById(R.id.webview01);
progressBar = (ProgressBar) findViewById(R.id.progressBar1);

web.setWebViewClient(new myWebClient());
web.getSettings().setJavaScriptEnabled(true);
web.loadUrl("http://my.oschina.net/u/1398907/admin/new-blog");
}

public class myWebClient extends WebViewClient
{
@Override
public void onPageStarted(WebView view, String url, Bitmap favicon) {
// TODO Auto-generated method stub
super.onPageStarted(view, url, favicon);
}

@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
// TODO Auto-generated method stub

view.loadUrl(url);
return true;

}

@Override
public void onPageFinished(WebView view, String url) {
// TODO Auto-generated method stub
super.onPageFinished(view, url);

progressBar.setVisibility(View.GONE);
}
}

// To handle "Back" key press event for WebView to go back to previous screen.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event)
{
if ((keyCode == KeyEvent.KEYCODE_BACK) && web.canGoBack()) {
web.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}
}

2，布局文件

<!--?xml version="1.0" encoding="utf-8"?-->
<linearlayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">

<textview android:layout_height="wrap_content"
android:layout_width="match_parent"
android:text="This is the demo of WebView Client"
android:textsize="20sp"
android:gravity="center_horizontal">
</textview>

<progressbar
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:layout_gravity="center"
android:id="@+id/progressBar1">

<webview
android:id="@+id/webview01"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:layout_weight="1">
</webview>
</progressbar>
</linearlayout>