Useful stuff

Here is nothing new but I wanted to bind some useful stuff that I could not find in one place.

1. Invoke the device's gallery and get the Image/video URI. 

private void invokeGallery () {

     Intent intent = new Intent();

     intent.setAction(Intent.ACTION_PICK);

     intent.setType("image/*");

     startActivityForResult(intent, 001);

}

   @Override

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {

        // TODO Auto-generated method stub

        super.onActivityResult(requestCode, resultCode, data);

        if ( requestCode == 001 && data != null && data.getData() != null ) {

            URi imageUri = data.getData();

            imageview.setImageURI(imageUri );

        }

    }

2. Launch default contact picker and get the contact details.

private void launchContactPicker() {

        Intent contactPickerIntent = new Intent(Intent.ACTION_PICK,

                Contacts.CONTENT_URI);

        startActivityForResult(contactPickerIntent, 1001);

}

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

   if ( requestCode == 1001 ) {

      Bundle _data = data.getExtras();

      Set<String> keys = _data.keySet();

      Iterator<String> iterate = keys.iterator();

      if ( iterate.hasNext() ) {

         String key = iterate.next();

         String contactName = _data.get(key).toString();

      //To query Content Provider for contact number:

      Cursor cursor = getContentResolver().query(android.provider.ContactsContract.Contacts.CONTENT_URI, null,    android.provider.ContactsContract.Contacts.DISPLAY_NAME + "=?", new String[]{contactName }, null);    

      //To query the Content Provider for Email ID's:

      //Using above cursor:

      String id = cursor .getString(cursor .getColumnIndex(android.provider.ContactsContract.Contacts._ID));

      Cursor emailCursor = getContentResolver().query(android.provider.ContactsContract.CommonDataKinds.Email.CONTENT_URI, null, android.provider.ContactsContract.CommonDataKinds.Email.CONTACT_ID+ " = " + id, null, null);

      if(emailCursor .getCount() > 0){

         emailCursor .moveToFirst();

         do {

             String _emailId = emailCursor.getString(emailCursor        .getColumnIndex(android.provider.ContactsContract.CommonDataKinds.Email.DATA));            }while(mCursor.moveToNext());

        }

            }

        }

}

3. Get device resolution and desity.

DisplayMetrics metrics = new DisplayMetrics();

getWindowManager().getDefaultDisplay().getMetrics(metrics);

 //Desity

switch(metrics.densityDpi){

    case DisplayMetrics.DENSITY_LOW:

         break;

    case DisplayMetrics.DENSITY_MEDIUM:

         break;

    case DisplayMetrics.DENSITY_HIGH:

         break;

}

//Resolution

int screenWidth = metrics .widthPixels;

int screenHeight = metrics .heightPixels;