webView.loadUrl("javascript:show(''"+info+"'')");

//第一个参数为js中的方法名，该段代码每执行一次则调用js方法一次
progressWebView.getWebview().evaluateJavascript("window.hasUserEditData()", new ValueCallback<String>() {
                @Override
                public void onReceiveValue(String value) {
　　　　　　　　　　　　//这里为返回值
                    boolean hasChanged = Boolean.parseBoolean(value);
                    //todo
                }
            });

webView.getSettings().setJavaScriptEnabled(true);
        webView.addJavascriptInterface(new JSHook(), "hello");

package wst.webview;

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebView;
import android.webkit.WebViewClient;

@SuppressLint("SetJavaScriptEnabled")
public class MainActivity extends Activity {

	private WebView contentWebView = null;

	@SuppressLint("SetJavaScriptEnabled")
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		contentWebView = (WebView) findViewById(R.id.webview);
		// 启用javascript
		contentWebView.getSettings().setJavaScriptEnabled(true);
		// 随便找了个带图片的网站
		contentWebView.loadUrl("http://www.weim.me/12408.html");
		// 添加js交互接口类，并起别名 imagelistner
		contentWebView.addJavascriptInterface(new JavascriptInterface(this), "imagelistner");
		contentWebView.setWebViewClient(new MyWebViewClient());

	}

	// 注入js函数监听
	private void addImageClickListner() {
		// 这段js函数的功能就是，遍历所有的img几点，并添加onclick函数，函数的功能是在图片点击的时候调用本地java接口并传递url过去
		contentWebView.loadUrl("javascript:(function(){" +
		"var objs = document.getElementsByTagName(\"img\"); " + 
				"for(var i=0;i<objs.length;i++)  " + 
		"{"
				+ "    objs[i].onclick=function()  " + 
		"    {  " 
				+ "        window.imagelistner.openImage(this.src);  " + 
		"    }  " + 
		"}" + 
		"})()");
	}

	// js通信接口
	public class JavascriptInterface {

		private Context context;

		public JavascriptInterface(Context context) {
			this.context = context;
		}

		public void openImage(String img) {
			System.out.println(img);
			//
			Intent intent = new Intent();
			intent.putExtra("image", img);
			intent.setClass(context, ShowWebImageActivity.class);
			context.startActivity(intent);
			System.out.println(img);
		}
	}

	// 监听
	private class MyWebViewClient extends WebViewClient {
		@Override
		public boolean shouldOverrideUrlLoading(WebView view, String url) {

			return super.shouldOverrideUrlLoading(view, url);
		}

		@Override
		public void onPageFinished(WebView view, String url) {

			view.getSettings().setJavaScriptEnabled(true);

			super.onPageFinished(view, url);
			// html加载完成之后，添加监听图片的点击js函数
			addImageClickListner();

		}

		@Override
		public void onPageStarted(WebView view, String url, Bitmap favicon) {
			view.getSettings().setJavaScriptEnabled(true);

			super.onPageStarted(view, url, favicon);
		}

		@Override
		public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {

			super.onReceivedError(view, errorCode, description, failingUrl);

		}
	}

}

package wst.webview;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import android.app.Activity;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.widget.TextView;

public class ShowWebImageActivity extends Activity {
	private TextView imageTextView = null;
	private String imagePath = null;
	private ZoomableImageView imageView = null;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.show_webimage);
		this.imagePath = getIntent().getStringExtra("image");

		this.imageTextView = (TextView) findViewById(R.id.show_webimage_imagepath_textview);
		imageTextView.setText(this.imagePath);
		imageView = (ZoomableImageView) findViewById(R.id.show_webimage_imageview);

		try {
			imageView.setImageBitmap(((BitmapDrawable) ShowWebImageActivity.loadImageFromUrl(this.imagePath)).getBitmap());
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static Drawable loadImageFromUrl(String url) throws IOException {

		URL m = new URL(url);
		InputStream i = (InputStream) m.getContent();
		Drawable d = Drawable.createFromStream(i, "src");
		return d;
	}
}

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

    <!-- TODO 默认占位图 -->

    <wst.webview.ZoomableImageView
        android:id="@+id/show_webimage_imageview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:scaleType="matrix"
        android:src="@drawable/icon" />

    <TextView
        android:id="@+id/show_webimage_imagepath_textview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textColor="#ffff0000" />

</LinearLayout>

<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" >
<WebView
android:id="@+id/webView"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@+id/linearLayout"
/>
<LinearLayout 
android:id="@+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
>
<Button
android:id="@+id/btn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Java调用JavaScript接口"
>
</Button>
</LinearLayout>
</RelativeLayout> 

private WebView webView;
private Handler handler = new Handler();
private Button button;
@SuppressLint("SetJavaScriptEnabled")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
//自定义webView设置
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.addJavascriptInterface(new MyJavaScriptInterface(MainActivity.this),"javaInterface");
//如果注释了，javaScript中的alert弹窗等就会失效，不显示
webView.setWebChromeClient(new WebChromeClient());
//webView.setWebChromeClient(new MyWebChromeClient());
//测试webView加载是否正常
//webView.loadUrl("http://www.baidu.com/");
webView.setWebViewClient(new HelloWebView());
webView.loadUrl("file:///android_asset/index.html");
button = (Button) findViewById(R.id.btn);
button.setonClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String param = "bb";
webView.loadUrl("javascript:showTitle('"+param+"')");
}
});
}
private class HelloWebView extends WebViewClient{
@Override
public boolean shouldOverrideUrlLoading(WebView view,String url) {
// Todo Auto-generated method stub
view.loadUrl(url);
return true;
} 
}
/**
* 在主线程中定义JavaScript可以调用的安卓接口
* @author CHQ
* API 以后，每个被调用java函数都要叫声明 @JavascriptInterface
*/
public class MyJavaScriptInterface{
private Context context;
public MyJavaScriptInterface(Context context){
this.context = context;
}
@JavascriptInterface
public String toString() {
return "this is interface";
}
@JavascriptInterface
public void clickOnAndroid() {
Toast.makeText(context,"js调用安卓：....",Toast.LENGTH_SHORT).show();
}
/**
* 安卓调用JS接口，要开启子线程调用
*/
@JavascriptInterface
public void call() {
Toast.makeText(context,"安卓客户端再调用JavaScript接口",Toast.LENGTH_SHORT).show();
handler.post(new Runnable() { 
@Override
public void run() {
String param = "bb";
webView.loadUrl("javascript:showTitle('"+param+"')");
}
});
}
}

<html>
<script type="text/javascript">
//安卓定义的接口1
function callAndroidInterface() {
window.javaInterface.clickOnAndroid();
}
//
function showTitle(param) {
alert("传参："+param);
var x = document.getElementById("title");
alert("标题："+x.innerHTML);
}
</script>
<body>
<h3 id="title">关于安卓与JavaScript的交互</h3>
<input type="button" value="调用接口1" onclick="callAndroidInterface()"></input> 
<input type="button" value="测试接口可用性" onclick="showTitle('aa')"></input> 
<input type="button" value="调用接口2" onclick="window.javaInterface.call()"></input>
</body>
</html>