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PO1)Difference between setOnClickListener and onclick 2) how to only reload webview w/o reloading others in the same linearlayout
 

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    <p>My application has a WebView on top. For showing things, I use Toast. But the Toast box has never shown if WebView appears, while before WebView shows, Toast is visible. I was wondering if Toast was likely covered by WebView. Did anyone have the same problems?</p> <p>Thanks.</p> <p>EDITING!!! Hi, thank you for all your inputs. I found I posted a wrong question for my problems. I found that the real problems are the following. In the code, I use setOnClickListener to register a callback for the button. In debugging, I found that the callback is not called for some reason, so the Toast statement is not called, and it is not covered by webview.</p> <p>Then, I tried the onclick attributes in xml layout for defining a callback clickGo for the button. This one works when I press the button, and the Toast shows.</p> <p>Now, my question is what is the difference between setOnClickListener and onlick.</p> <p>One more question, in my clickGo, I refresh the webview. The webview indeed reloads when button is clicked. But in the meanwhile the spinner is also reloaded, and the selection position is reset to the 0-th. How can I prevent this?</p> <p>Thank you again!</p> <pre><code> public class MainActivity extends Activity { JSONArray jArray; String result = null; InputStream is = null; StringBuilder sb=null; private Spinner spinner; private Button btnSubmit; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); addListenerOnButton(); addListenerOnSpinnerItemSelection(); new DownloadTask().execute("www.google.com"); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.main, menu); return true; } // Given a string representation of a URL, sets up a connection and gets // an input stream. private String downloadUrl(String urlString) throws IOException { HttpClient httpClient = new DefaultHttpClient(); HttpGet get = new HttpGet(urlString); HttpResponse response = httpClient.execute(get); // Build up result return EntityUtils.toString(response.getEntity()); } public void addListenerOnSpinnerItemSelection() { spinner = (Spinner) findViewById(R.id.spinner); spinner.setOnItemSelectedListener(new CustomOnItemSelectedListener()); } public void clickGo(View v) { Toast toast = Toast.makeText(MainActivity.this, "OnClickListener : " + "\nSpinner 1 : "+ String.valueOf(spinner.getSelectedItem()), Toast.LENGTH_SHORT); toast.setGravity(Gravity.TOP, 0, 0); toast.show(); new DownloadTask().execute("www.google.com"); } // get the selected dropdown list value public void addListenerOnButton() { spinner = (Spinner) findViewById(R.id.spinner); btnSubmit = (Button) findViewById(R.id.button); btnSubmit.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Toast toast = Toast.makeText(MainActivity.this, "OnClickListener : " + "\nSpinner 1 : "+ String.valueOf(spinner.getSelectedItem()), Toast.LENGTH_SHORT); toast.setGravity(Gravity.TOP, 0, 0); toast.show(); new DownloadTask().execute("www.google.com"); } }); } ` // Implementation of AsyncTask used to download XML feed from stackoverflow.com. private class DownloadTask extends AsyncTask&lt;String, Void, String&gt; { @Override protected String doInBackground(String... urls) { return downloadUrl(urls[0]); } @Override protected void onPostExecute(String result) { setContentView(R.layout.activity_main); // Displays the HTML string in the UI via a WebView WebView myWebView = (WebView) findViewById(R.id.webview); WebSettings webSettings = myWebView.getSettings(); webSettings.setJavaScriptEnabled(true); myWebView.loadUrl(result); } } } &lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:orientation="vertical" &gt; &lt;LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="horizontal" &gt; &lt;TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="@string/word" /&gt; &lt;Button android:id="@+id/button" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Go" android:onClick="clickGo" /&gt; &lt;/LinearLayout&gt; &lt;Spinner android:id="@+id/spinner" android:layout_width="match_parent" android:layout_height="wrap_content" android:entries="@array/dictionaries" android:prompt="@string/dict_prompt" /&gt; &lt;WebView android:id="@+id/webview" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;/LinearLayout&gt; </code></pre>
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    2. COThis will be the first occasion when I hear that a Toast is overcovered. Paste the code for the Toast as well.
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    3. COI changed my questions and uploaded my code.
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