Android webview 取得javascript返回值

package com.she.jyass.UI;

import android.content.Context;
import android.webkit.WebView;

public class myWebView extends WebView {
	public native String StringstringByEvaluatingJavaScriptFromString(String script);
	public myWebView(Context context) {
		super(context);
	}
}

使用myWebView即可用StringstringByEvaluatingJavaScriptFromString来执行js并获得返回值