Android Programming 4

This slides explain simple usage of network, webview and toast

Transcript

1. Android Programming Network ,WebView and Toast
2. Using Internet ›  Add internet permission on our app, modifying manifest file (after sdk declaration). ›  <uses-permission android:name=” android.permission.INTERNET"/> Android Programming
3. Using a WebView //set up webView mWv.setWebViewClient(new WebViewClient()); mWv.loadUrl("http:// www.google.com"); mWv.getUrl(); mWv.getTitle(); Android Programming
4. Let’s Download! HttpClient client = new DefaultHttpClient(); HttpGet request = new HttpGet(”url”); HttpResponse response = client.execute(request); Android Programming
5. Where is my download? InputStream in = response.getEntity().getContent(); BufferedReader reader = new BufferedReader(new InputStreamReader(in)); StringBuilder str = new StringBuilder(); String line = reader.readLine(); str.append(line); //yours download should be here. String out = str.toString(); Android Programming
6. AsyncTask public class MyTask extends AsyncTask<T, T, T> { @Override protected Boolean doInBackground(T… params){ // must be implemented } } Android Programming
7. Other useful method @Override protected void onPreExecute() { //Called before doInBackground() } @Override protected void onProgressUpdate(T... values) { } @Override protected void onCancelled() { } @Override protected void onPostExecute(T result) { //Called after doInBackground() } Android Programming
8. Toast Toast.makeText( this, text, Toast.LENGTH_SHORT ) .show(); Android Programming
9. What should we do today? First Step ›  When the user click on the “go” button the app will show the web page for the url entered. ›  When the user click the “save” button , the page displayed will be saved on internal storage with her title as name. Android Programming
10. What should we do today? Second Step ›  When the user click on a page title, the page saved will be displayed. Android Programming
11. Credit: ›  Toast image Android Programming