给WebView添加漂亮的加载进度条

浏览数：32 / 时间：2015年06月09日

为了增强用户体验，所有在WebView头部给加了个进度条，看起来不错哦。

布局XMl：activity_main.xml

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

        <WebView
            android:id="@+id/webView"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"/>
        
        <ProgressBar  
	        android:id="@+id/pb"  
	        style="?android:attr/progressBarStyleHorizontal"  
	        android:layout_width="fill_parent"  
	        android:layout_height="3dip"  
	        android:indeterminateOnly="false"  
	        android:max="100"  
	        android:progressDrawable="@drawable/progress_bar_states" >  
	    </ProgressBar>
</RelativeLayout>

自定义进度条：

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >

    <item android:id="@android:id/background">
        <shape>
            <corners android:radius="2dp" />
            <gradient
                android:angle="270"
                android:centerColor="#E3E3E3"
                android:endColor="#E6E6E6"
                android:startColor="#C8C8C8" />
        </shape>
    </item>
    <item android:id="@android:id/progress">
        <clip>
            <shape>
                <corners android:radius="2dp" />
                <gradient
                    android:centerColor="#4AEA2F"
                    android:endColor="#31CE15"
                    android:startColor="#5FEC46" />
                
            </shape>
        </clip>
    </item>

</layer-list>

然后就是Activity的主要代码啦：

	ProgressBar pb;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.xxx);
		
		
		pb = (ProgressBar) findViewById(R.id.pb);
		pb.setMax(100);
		
		WebView webView = (WebView) findViewById(R.id.webview);
		webView.getSettings().setJavaScriptEnabled(true);
		webView.getSettings().setSupportZoom(true);  
		webView.getSettings().setBuiltInZoomControls(true);
		webView.setWebChromeClient(new WebViewClient() );
		webView.loadUrl("http://www.x.com");
	}
	
	private class WebViewClient extends WebChromeClient {
		@Override
		public void onProgressChanged(WebView view, int newProgress) {
			pb.setProgress(newProgress);
			if(newProgress==100){
				pb.setVisibility(View.GONE);
			}
			super.onProgressChanged(view, newProgress);
		}
		
	}