Generate unique no using Calendar class/ generate unique code for using hash code

I need to pass unique no to server every time with updated user data.  For that I think, first I need to generate random no and store in a variable.  When ever I need to pass updated user data, I generate random no again and compare it with stored random no.  If It is different I pass it with user data otherwise I genarete it again and again until I fond different no. This sceneraio is not good for me.  For generate unique no I use Calender class and get the current time in millisecond. I did not need to compare just generate the no and pass with user data.

import java.util.Calendar;
import java.util.TimeZone;

Calendar.getInstance(TimeZone.getTimeZone("UTC")).getTimeInMillis();

above code return the time in milliseconds from 1970.

Using "UTC" for getting accurate value from same time zone.
Please imports related file by pressing "CTRL+SHIFT+O" keys.

Set transparent background in textbox / Remove backround of text box in android

You just need to set background property as nulll in xml file, like this

<EditText
        android:id="@+id/mytext"
        android:layout_width="30dp"
        android:layout_height="56dp"
        android:background="@null"
      >

Lanuch Email available client in phone / Send Email from your application

Android application can send email from available email clients in your phone.  For launching the email clients, simply pass the "ACTION_SEND" in intent constructor and add some extra to intents. You also have to set type of the contents.

Example:

Intent emailClient= new Intent(Intent.ACTION_SEND);
emailClient.putExtra(Intent.EXTRA_EMAIL, "email@domain.com");
emailClient.putExtra(Intent.EXTRA_SUBJECT, "Hi");
emailClient.putExtra(Intent.EXTRA_TEXT, "How r u!");
emailClient.setType("message/rfc822");
startActivity(Intent.createChooser(emailClient,"Title")); 

You need to add Internet permission in manifest file like this

 <uses-permission android:name="android.permission.INTERNET" />


Note: You can test this code only on phone. Emulator can not send email and will generate error.

Send SMS/lanuch SMS service for sending sms

You can send SMS by your android application.  Simply create an Intent and pass ACTION_VIEW in constructor. Set type of intent as "vnd.android-dir/mms-sms".  It will open you SMS editor with your custom text.


Intent smsIntent = new Intent(Intent.ACTION_VIEW);
smsIntent.putExtra("sms_body","Hello, How r you !");
smsIntent.setType("vnd.android-dir/mms-sms");
startActivity(smsIntent);

Android: Hide title bar of window / activity programatically.

At run time, In onCreate() method we can request window feature for hiding the title of the activity/window.

this.requestWindowFeature(Window.FEATURE_NO_TITLE);

Above line must be write before adding the content on the view.

this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.my_activity); 

for Importing the references press CTRL+SHIFT+O