Вы можете решить вашу проблему, осуществив простой интерфейс JavaScript. Ниже приведен простой пример.
активы/button_demo.xml
<html>
<head></head>
<body style="margin:0; padding:0;">
<style type="text/css">
#demo {
height: 100%;
width: 100%;
margin-left: auto;
margin-right: auto;
overflow: auto;
}
#demo a {
font-family: sans-serif;
font-size: 8pt;
width: 95%;
height: 35px;
display: block;
margin-left: auto;
margin-right: auto;
text-align: center;
padding: 5px;
margin: 1px;
border: 1px solid blue;
text-decoration: none;
color: blue;
word-wrap: break-word;
}
</style>
<script type="text/javascript">
function showToast(str){
Android.showToast(str);
}
</script>
<div id="demo">
<a href="javascript: showToast('test')">button</a>
</div>
</body>
</html>
activity_main.xml
<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"
tools:context=".MainActivity">
<WebView
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="@+id/webView"
android:layout_centerVertical="true"/>
</RelativeLayout>
MainActivity.java
import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.text.TextUtils;
import android.util.Log;
import android.webkit.JavascriptInterface;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.Toast;
import java.lang.ref.WeakReference;
public class MainActivity extends ActionBarActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private WebView webView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
webView = (WebView) findViewById(R.id.webView);
WebSettings webSettings = webView.getSettings();
webSettings.setJavaScriptEnabled(true);
webView.setWebViewClient(new MyWebClient());
webView.addJavascriptInterface(new WebInterface(MainActivity.this), "Android");
webView.loadUrl("file:///android_asset/button_demo.html");
}
private class MyWebClient extends WebViewClient {
/**
* It is a good idea to let proper web browsers handle URLs you don't know otherwise
* you could be putting your users to danger by injecting JavaScript interface
*/
@Override
public boolean shouldOverrideUrlLoading(WebView view, String url) {
//return super.shouldOverrideUrlLoading(view, url);
Uri uri;
try {
uri = Uri.parse(url);
} catch (NullPointerException e) {
// let Android deal with this
return true;
}
String host = uri.getHost(); //Host is null when user clicked on email, phone number, ...
if (host != null && host.equals("stackoverflow.com")) {
// This is my web site, so do not override; let my WebView load the page
return false;
}
else {
// Otherwise, the link is not for a page on my site, so launch another Activity that handles URLs or anything else (email, phone number, ...)
Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(intent);
return true;
}
}
@Override
public void onPageFinished(WebView view, String url) {
Log.d(TAG, "Page finished loading");
super.onPageFinished(view, url);
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
// No connection or HTTP error e.g. 404
Log.d(TAG, "Received webview error: " + errorCode + " - " + description + " ; " + failingUrl);
}
}
private final class WebInterface {
/**
* Caution: If you've set your targetSdkVersion to 17 or higher, you must
* add the @JavascriptInterface annotation to any method that you want
* available to your JavaScript (the method must also be public). If you do
* not provide the annotation, the method is not accessible by your web page
* when running on Android 4.2 or higher.
*/
private WeakReference<Activity> mContextRef;
private Toast toast;
public WebInterface(Activity context) {
this.mContextRef = new WeakReference<Activity>(context);
}
@JavascriptInterface
public void showToast(final String toastMsg) {
if (TextUtils.isEmpty(toastMsg) || mContextRef.get() == null) {
return;
}
// JavaScript doesn't run on the UI thread, make sure you do anything UI related like this
// You don't need this for the Toast, but otherwise it's a good idea
mContextRef.get().runOnUiThread(new Runnable() {
@Override
public void run() {
if (toast != null) {
toast.cancel();
}
toast = Toast.makeText(mContextRef.get(), toastMsg, Toast.LENGTH_SHORT);
toast.show();
}
});
}
}
}