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Android uses Webwiew to load page usage examples (Hybrid app development) _android

Source: Internet
Author: User
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Hybrid APP is the acronym for mixed-mode applications, with the advantages of Native app and web App two models, low development cost, and a cross-platform feature of web technology. At present, the middleware-based mobile development framework is known as the Hybrid development model, such as foreign PhoneGap, titanium, Sencha, as well as domestic appcan, Rexsee and so on. The Hybrid APP development model is being recognized by more and more companies and developers, and is believed to be the mainstream mobile application development model in the future.

The principle of Hybrid app Fusion Web app is to embed a webview component that can load pages in this component, equivalent to an embedded browser, with the following code:

Copy Code code as follows:

Import android.app.Activity;
Import Android.os.Bundle;
Import android.webkit.WebSettings;
Import Android.webkit.WebView;

public class Aactivity extends activity{

@Override
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Create WebView
WebView webview= New WebView (this);
Switch to content view
Setcontentview (WebView);
Get WebView Configuration
WebSettings ws = Webview.getsettings ();
Enable JavaScript
Ws.setjavascriptenabled (TRUE);
Load a page under the assets directory
Webview.loadurl ("file:///android_asset/www/BoBox/index.html");
}
}

Another way to introduce this is to add the WebView component to the layout file as follows:

Copy Code code as follows:

<?xml version= "1.0" encoding= "Utf-8"?>
<linearlayout xmlns:android= "Http://schemas.android.com/apk/res/android"
android:orientation= "Vertical"
Android:layout_width= "Fill_parent"
android:layout_height= "Fill_parent" >
<webview
Android:layout_width= "Fill_parent"
android:layout_height= "Wrap_content"
Android:id= "@+id/webview"
/>
</LinearLayout>

Copy Code code as follows:

Import android.app.Activity;
Import Android.os.Bundle;
Import android.webkit.WebSettings;
Import Android.webkit.WebView;

public class Bactivity extends activity{

@Override
public void OnCreate (Bundle savedinstancestate) {
Super.oncreate (savedinstancestate);
Setcontentview (R.layout.webview);
Find WebView
WebView WebView = (webview) Findviewbyid (R.id.webview);
Get WebView Configuration
WebSettings ws = Webview.getsettings ();
Enable JavaScript
Ws.setjavascriptenabled (TRUE);
A page that is loaded into the assets directory
Webview.loadurl ("file:///android_asset/www/index.html");
}
}

WebView also has a very important method--addjavascriptinterface that can be used to implement the invocation of Java programs and JavaScript programs, the code is as follows:

Copy Code code as follows:

Webview.addjavascriptinterface (New Object () {
public void Clickonandroid () {
Mhandler.post (New Runnable () {
public void Run () {
Webview.loadurl ("Javascript:wave ()");
}
});
}
}, "demo");

The page code is as follows:

Copy Code code as follows:

<script>
Function Wave () {
document.getElementById ("id"). InnerHTML = "Hello world!";
}
</script>
<body>
<div>
<a href= "#" id= "demo" onclick= "Window.demo.clickOnAndroid ()" >click me</a>
</div>
</body>

This way, when you click on the page click the Me button, you will invoke the Clickonandroid function in the Java code, and the Clickonandroid function calls the Wave method in the page. Note that this interface is running in the Android 2.3 version of the emulator, causing the webview to crash and has not yet been repaired. This is a very simple demo Java and JavaScript to invoke each other example, in the actual application of the page call in the Clickonandroid function can call the camera, address book, notification reminders and other device functions.

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