Question

android中webview 怎么实现网页加载时显示加载进度

Answer 1

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

复制代码 代码如下:

<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>

不要忘记在Mainfest加入使用网络权限哟.

复制代码 代码如下:

<uses-permission android:name="android.permission.INTERNET"/>