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Sometimes we need to know whether an SD card is present or not. So here is a check to see if an SD card is present. It returns true if the SD card is present and writable, false otherwise.
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public static boolean isSdPresent() { return android.os.Environment.getExternalStorageState().equals(android.os.Environment.MEDIA_MOUNTED); } |
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AlertDialog.Builder builder = new AlertDialog.Builder(this); builder.setMessage("If you like it give 5 stars ;)") .setCancelable(false) .setPositiveButton("Yes > Go Market", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=") ) ); } }) .setNegativeButton("No, later", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int id) { dialog.cancel(); } }); alert = builder.create(); alert.show(); |
This code generates a random integer using Android’s Random class, and sets a randomly selected drawable as background for a View.
Place your images into /res/drawable/ and update private int pics[] with the drawables from which you want to pick one randomly.
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private int pics[]= {R.drawable.p1, R.drawable.p2, R.drawable.p3, R.drawable.p4, R.drawable.p5}; private Random rand = new Random(); public int set_rand_pic() { int pos = rand.nextInt(pics.length-1); mycard.setBackgroundResource(pics[pos]); return pos; } |
A quick a simple Alert Dialog Popup with Title, Message, Icon and Button
Don’t forget to import add the imports
import android.app.AlertDialog; import android.content.DialogInterface;
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AlertDialog alertDialog = new AlertDialog.Builder(this).create(); alertDialog.setTitle("Title"); alertDialog.setMessage("Message"); alertDialog.setButton("OK", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // TODO Add your code for the button here. } }); // Set the Icon for the Dialog alertDialog.setIcon(R.drawable.icon); alertDialog.show(); |
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NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Intent notificationIntent = new Intent(this, "Your linked class"); PendingIntent pi = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_ONE_SHOT); Notification note = new Notification(R.drawable.ic_launcher, "Notification Title", System.currentTimeMillis()); note.setLatestEventInfo(this, "Title", "Description", pi); note.defaults |= Notification.DEFAULT_ALL; note.flags |= Notification.FLAG_AUTO_CANCEL; int id = Integer.parseInt(intent.getStringExtra("id")); manager.notify(id, note); |
This code makes the current Activity Full-Screen. No Status-Bar or anything except the Activity-Window
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public class FullScreen extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(Window.FEATURE_NO_TITLE); getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); setContentView(R.layout.main); } } |
find() uses a pattern syntax. A dot represents “any character.” This will match the first character of any string you search. In order to search for a literal dot, you need to doo this:
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local dotIndex = string.find(myString, "%."); |
CGRect frameRect = _textfield.frame;
frameRect.size.height = height;
_textfield.frame = frameRect;
Use fmod, to compute the floating point modulus.
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float remainder = fmodf(a_float, another_float); |
If you want to use double instead of float you’d use fmod instead.
If you want to use long double you’d use fmodl instead.
public void postData() {
// Create a new HttpClient and Post Header
HttpClient httpclient = new DefaultHttpClient();
HttpPost httppost = new HttpPost(“http://www.yoursite.com/script.php”);
try {
// Add your data
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
nameValuePairs.add(new BasicNameValuePair(“id”, “12345″));
nameValuePairs.add(new BasicNameValuePair(“stringdata”, “AndDev is Cool!”));
httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
// Execute HTTP Post Request
HttpResponse response = httpclient.execute(httppost);
}
catch (ClientProtocolException e) {
// TODO Auto-generated catch block
}
catch (IOException e) {
// TODO Auto-generated catch block
}
}
