How to make a HTTP GET request on Google Glass GDK - http

Question

I have some code, but the new HTTPRequest().execute(); won't work. What this code should do is use an HTTP GET request and then display the text on the screen (with the line of code card.setText(mResult);). My entire HTTPRequest class may be wrong? Is there a class that exists that I can call to say something like ExampleHTTPGetClass.getURLData("example.com"); I am fairly new to glass development, here is my code I tried to write:
public class MainActivity extends Activity {
private CardScrollView mCardScroller;
private View mView;
#Override
protected void onCreate(Bundle bundle) {
super.onCreate(bundle);
mView = buildView();
mCardScroller = new CardScrollView(this);
mCardScroller.setAdapter(new CardScrollAdapter() {
#Override
public int getCount() {
return 1;
}
#Override
public Object getItem(int position) {
return mView;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
return mView;
}
#Override
public int getPosition(Object item) {
if (mView.equals(item)) {
return 0;
}
return AdapterView.INVALID_POSITION;
}
});
// Handle the TAP event.
mCardScroller.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// Plays disallowed sound to indicate that TAP actions are not supported.
AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
am.playSoundEffect(Sounds.DISALLOWED);
}
});
setContentView(mCardScroller);
new HTTPRequest().execute();
}
private View buildView() {
CardBuilder card = new CardBuilder(this, CardBuilder.Layout.TEXT);
card.setText(mResult);
return card.getView();
}
HttpURLConnection mURLConnection;
String mResult;
private class HTTPRequest extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... arg0){
try{
URL url = new URL("http://exampleURL.com");
mURLConnection = (HttpURLConnection)
url.openConnection();
InputStream in = new BufferedInputStream(
mURLConnection.getInputStream());
int ch;
StringBuffer b = new StringBuffer();
while ((ch = in.read()) != -1){
b.append((char) ch);
}
mResult = new String(b);
Log.d("App", mResult);
} catch (Exception e){}
return null;
}
}
}
Thanks, Ryan.

Answer 1

You call buildView() and setText() before executing the Http request. Add onPostExecute in your AsyncTask and setText there. Try this:
private class HTTPRequest extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... arg0){
try{
URL url = new URL("http://exampleURL.com");
mURLConnection = (HttpURLConnection)
url.openConnection();
InputStream in = new BufferedInputStream(
mURLConnection.getInputStream());
int ch;
StringBuffer b = new StringBuffer();
while ((ch = in.read()) != -1){
b.append((char) ch);
}
mResult = new String(b);
Log.d("App", mResult);
} catch (Exception e){}
return null;
}
#Override
protected void onPostExecute(Void v) {
mView = buildView();
}
}
Also, don't forget to add
<uses-permission android:name="android.permission.INTERNET"/>
in the manifest.