Tips for Android Developer

• Press Back button two time to exit and move task to background
  
  boolean doubleBackToExitPressedOnce = false; /////// @Override public void onBackPressed() { if (doubleBackToExitPressedOnce) { super.onBackPressed(); return; } this.doubleBackToExitPressedOnce = true; Toast.makeText(this, "Chạm lần nữa để thoát", Toast.LENGTH_SHORT).show(); new Handler().postDelayed(new Runnable() { @Override public void run() { doubleBackToExitPressedOnce = false; } }, 2000); //2000 <-> 2 second }

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  boolean doubleBackToExitPressedOnce = false; /////// @Override     public void onBackPressed() {            if (doubleBackToExitPressedOnce) {                 super.onBackPressed();                 return;             }               this.doubleBackToExitPressedOnce = true;             Toast.makeText(this, "Chạm lần nữa để thoát", Toast.LENGTH_SHORT).show();               new Handler().postDelayed(new Runnable() {                   @Override                 public void run() {                     doubleBackToExitPressedOnce = false;                 }             }, 2000); //2000 <-> 2 second     }

• Open message, put adress and body text on it
  
  private void sendSmS(String address, String sms_body) { Intent smsIntent = new Intent(Intent.ACTION_VIEW); smsIntent.setType("vnd.android-dir/mms-sms"); smsIntent.putExtra("address", address); smsIntent.putExtra("sms_body",sms_body); startActivity(smsIntent); }

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  private void sendSmS(String address, String sms_body)     {         Intent smsIntent = new Intent(Intent.ACTION_VIEW);         smsIntent.setType("vnd.android-dir/mms-sms");         smsIntent.putExtra("address", address);         smsIntent.putExtra("sms_body",sms_body);         startActivity(smsIntent);     }

• Made a USSD call
  
  private void Uri ussdToCallableUri(String ussd) { String uriString = ""; if(!ussd.startsWith("tel:")) uriString += "tel:"; for(char c : ussd.toCharArray()) { if(c == '#') uriString += Uri.encode("#"); else uriString += c; } return Uri.parse(uriString); } private void callUSSD(String code) { Intent callIntent = new Intent(Intent.ACTION_CALL, ussdToCallableUri(code)); startActivity(callIntent); } //Use callUSSD("*101#");

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  private void Uri ussdToCallableUri(String ussd) {         String uriString = "";         if(!ussd.startsWith("tel:"))             uriString += "tel:";         for(char c : ussd.toCharArray()) {             if(c == '#')                 uriString += Uri.encode("#");             else                 uriString += c;         }         return Uri.parse(uriString);     }   private void callUSSD(String code)     {         Intent callIntent = new Intent(Intent.ACTION_CALL, ussdToCallableUri(code));         startActivity(callIntent);     }   //Use callUSSD("*101#");

• Good Calendar Date Picker
  
  https://github.com/code-troopers/android-betterpickers

  1	https://github.com/code-troopers/android-betterpickers

  
  
  @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); imageButtonCalendar.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { FragmentManager fm = getFragmentManager(); DateTime now = DateTime.now(); CalendarDatePickerDialogFragment calendarDatePickerDialogFragment = CalendarDatePickerDialogFragment .newInstance(NgayFragment.this, year, month - 1, day); calendarDatePickerDialogFragment.setDateRange( new MonthAdapter.CalendarDay(oldestYear, oldestMonth - 1, oldestDay), new MonthAdapter.CalendarDay(now.getYear(), now.getMonthOfYear() - 1, now.getDayOfMonth())); calendarDatePickerDialogFragment.show(fm, FRAG_TAG_DATE_PICKER); } });; } ///// @Override public void onDateSet(CalendarDatePickerDialogFragment dialog, int year, int monthOfYear, int dayOfMonth) { //your code }

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  @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         imageButtonCalendar.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 FragmentManager fm = getFragmentManager();                 DateTime now = DateTime.now();                 CalendarDatePickerDialogFragment calendarDatePickerDialogFragment = CalendarDatePickerDialogFragment                         .newInstance(NgayFragment.this, year, month - 1,                                 day);                   calendarDatePickerDialogFragment.setDateRange(                         new MonthAdapter.CalendarDay(oldestYear, oldestMonth - 1,  oldestDay),                         new MonthAdapter.CalendarDay(now.getYear(), now.getMonthOfYear() - 1, now.getDayOfMonth()));                   calendarDatePickerDialogFragment.show(fm, FRAG_TAG_DATE_PICKER);             }         });;     } ///// @Override public void onDateSet(CalendarDatePickerDialogFragment dialog, int year, int monthOfYear, int dayOfMonth) {         //your code     }

• Retrieve contact name from phone number
  
  public static String getContactName(Context context, String phoneNumber) { ContentResolver cr = context.getContentResolver(); Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber)); Cursor cursor = cr.query(uri, new String[]{ContactsContract.PhoneLookup.DISPLAY_NAME}, null, null, null); if (cursor == null) { return null; } String contactName = null; if(cursor.moveToFirst()) { contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME)); } if(cursor != null && !cursor.isClosed()) { cursor.close(); } if(contactName == null) return phoneNumber; return contactName; }

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  public static String getContactName(Context context, String phoneNumber) {         ContentResolver cr = context.getContentResolver();         Uri uri = Uri.withAppendedPath(ContactsContract.PhoneLookup.CONTENT_FILTER_URI, Uri.encode(phoneNumber));         Cursor cursor = cr.query(uri, new String[]{ContactsContract.PhoneLookup.DISPLAY_NAME}, null, null, null);         if (cursor == null) {             return null;         }         String contactName = null;         if(cursor.moveToFirst()) {             contactName = cursor.getString(cursor.getColumnIndex(ContactsContract.PhoneLookup.DISPLAY_NAME));         }           if(cursor != null && !cursor.isClosed()) {             cursor.close();         }         if(contactName == null)             return phoneNumber;         return contactName;     }

• Updating….

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