1、佈局文件main.xml
<?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" >
<WebView
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="@+id/webview" />
</LinearLayout>
2、HTML文件main.html
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
</head>
<script>
/* 這個函數被Activity調用 */
function wave()
{
document.getElementById("droid").src="ic_launcher.png";
}
</script>
<body>
<!-- 從HTML文件中調用activity中的函數 -->
<a onClick="window.Js_interfaceTest.clickOnAndroid()">
<div>
<img id="droid" src="android_normal.png"/>
<br> Click me!
</div>
</a>
<br>
<button οnclick="window.Js_helloWorld.show()">click</button>
</body>
</html>
3、應用程序Java源文件
import android.annotation.SuppressLint;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.Toast;
public class MainActivity extends Activity
{
private WebView mWebView = null;
private Handler mHandler = new Handler();
@SuppressLint("SetJavaScriptEnabled")
@Override
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.activity_main);
mWebView = (WebView) findViewById(R.id.webview);
WebSettings webSettings = mWebView.getSettings();
webSettings.setJavaScriptEnabled(true);
webSettings.setSupportZoom(false);
//JSInterface這個類一定要在主線程中
mWebView.addJavascriptInterface(new interfaceTest(), "Js_interfaceTest");
mWebView.addJavascriptInterface(new helloWorld(), "Js_helloWorld");
mWebView.loadUrl("file:///android_asset/main.html");
}
class helloWorld
{
helloWorld() { }
public void show() {
mHandler.post(new Runnable() {
@Override
public void run() {
Toast.makeText(MainActivity.this,"Hello World", Toast.LENGTH_SHORT).show();
}
});
}
}
//定義 addJavascriptInterface()的第一個參數Object
final class interfaceTest
{
interfaceTest() { }
public void clickOnAndroid()
{
mHandler.post(new Runnable()
{
@Override
public void run()
{
//調用 HTML中的javaScript函數
mWebView.loadUrl("javascript:wave()");
}
});
}
}
}
4、所有資源文件和html文件要放在assets目錄下