This example explains how to get device unique id in android. The device unique id is needed when we want user registration for a specific device. This way we can achieve security. Most of the banking applications today are using such approach.
Android Activity Layout (activity_main.xml)
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity" >
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:textColor="#cc0000"
android:textSize="32sp" />
</RelativeLayout>Android Activity (MainActivity.java)
package com.javatechig.getdeviceid;
import android.app.Activity;
import android.os.Bundle;
import android.provider.Settings.Secure;
import android.widget.TextView;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//getting unique id for device
String id = Secure.getString(getContentResolver(), Secure.ANDROID_ID);
//displaying id in textview
TextView tv = (TextView) findViewById(R.id.textView1);
tv.setText(id);
}
}