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?
Thanks.
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.
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.
Now, my question is what is the difference between setOnClickListener and onlick.
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?
Thank you again!
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<String, Void, String> {
@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);
}
}
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<TextView android:id="@+id/text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/word" />
<Button android:id="@+id/button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Go"
android:onClick="clickGo" />
</LinearLayout>
<Spinner android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:entries="@array/dictionaries"
android:prompt="@string/dict_prompt" />
<WebView android:id="@+id/webview"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
