图片自适应WebView大小

mainActivity如下:

package com.cn.testwebview;
import android.os.Bundle;
import android.view.MotionEvent;
import android.view.View;
import android.webkit.WebView;
import android.app.Activity;
/**
 * Demo描述:
 * WebView显示图片,但有的图片很小不能铺满整个WebView.
 * 现解决
 */
public class MainActivity extends Activity {
    private WebView mWebView;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		init();
	}
    private void init(){
    	mWebView=(WebView) findViewById(R.id.webview);
    	mWebView.setVerticalScrollBarEnabled(false);
    	mWebView.setHorizontalScrollBarEnabled(false);
    	mWebView.getSettings().setJavaScriptEnabled(true);
		mWebView.getSettings().setUseWideViewPort(true);
		mWebView.getSettings().setLoadWithOverviewMode(true);
		String imageUrl="http://csdnimg.cn/www/images/pic_foot_gongshang.png";
    	String data = "<p><img src=\""+imageUrl+"\" width=\"100%\""+" height=\"100%\""+"  /></p>";
    	mWebView.loadDataWithBaseURL("", data, "text/html", "UTF-8", "");
    	//禁止WebView滑动
    	mWebView.setOnTouchListener(new View.OnTouchListener() {
    	    public boolean onTouch(View v, MotionEvent event) {
    	      return (event.getAction() == MotionEvent.ACTION_MOVE);
    	    }
    	  });
    }

}

main.xml如下:

<?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"
    android:background="#eee"
    >

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="@drawable/ic_launcher" />


    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:layout_below="@id/imageView"
        android:layout_marginLeft="20dip"
        android:layout_marginRight="20dip"
       >
	<WebView
	    android:id="@+id/webview"
	    android:layout_width="fill_parent"
        android:layout_height="fill_parent"
	    android:layout_marginBottom="20dp"
	    />
        
    </RelativeLayout>

</RelativeLayout>