WebView activity will use the Internet, so you must add the Internet usage permission in your AndroidManifest.xml file.
<uses-permission android:name = "android.permission.INTERNET"/>Then in your main Activity, define a WebView and associate it with your layout.
mWebView = (WebView) findViewById(R.id.web_view);For a WebView you have a few choices about displaying contents. You can open a URL, you can create your HTML code inside your Activity and display it, you can open HTML files from your device's drive and also you can display other contents from your device's drive. // Loading a URL mWebView.loadUrl("http://www.androtips.com"); // Loading HTML code created in the Activity String data = "<html><body><h2>Hello WebView</h2></body></html>"; String mimeType = "text/html"; String encoding = "utf-8"; mWebView.loadData(data , mimeType , encoding); // Loading an HTML file or any content from sd card String filePath = "file:///data/data/com.webkitdemo/test.html"; mWebView.loadUrl(filePath);Now you have a basic WebView to display your contents. The problem with this default WebView is, when you click to a link in the webpage, Android will attempt to open its default Browser. Of course we want to open any links from our WebView open in our own WebView. To do this, we must add this small inner-class to our Activity.
private class mWebViewClient extends WebViewClient {
/** Opens new links in the same WebView instead of opening it in Browser Application.*
*/
@Override
public boolean shouldOverrideUrlLoading(WebView view , String url) {
view.loadUrl(url);
return true;
}
}
Another good feature to add to our activity is setting the behavior of the Back button of device. So that we can go back from a link we went from our WebView.
@Override
public boolean onKeyDown(int keyCode, KeyEvent event) {
if ((keyCode == KeyEvent.KEYCODE_BACK) && mWebView.canGoBack()) {
mWebView.goBack();
return true;
}
return super.onKeyDown(keyCode, event);
}Because we have small display sizes on mobile devices, we might need to add zoom controls to our WebView to enhance readability. In order to add zoom controls, you must add this controls into your onCreate method.
@Override
public void onCreate(Bundle savedInstanceState) {
...
...// Zoom controls
FrameLayout mContentView = (FrameLayout) getWindow().getDecorView().findViewById(android.R.id.content);
final View zoom = this.mWebView.getZoomControls();
mContentView.addView(zoom, ZOOM_PARAMS);
zoom.setVisibility(View.GONE);
...
...
}
Your WebView is ready to use now. You can display any content in this WebView and integrate it into your Applications.
Enjoy!
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