Alert Dialog in Android

This Custom dialog used for Display information or alert to user.

public void dialog_message(String msg)

       {

        final AlertDialog alertDialog = new  AlertDialog.Builder(context.this).create();

              alertDialog.setTitle("Title");

              alertDialog.setIcon(R.drawable.close);

              alertDialog.setMessage(msg);

              alertDialog.setButton("Yes", new DialogInterface.OnClickListener()

              {

                     public void onClick(DialogInterface dialog, int which)

                     {

                           System.exit(0);    

                     }

              });

              alertDialog.setButton2("No", new DialogInterface.OnClickListener()

              {

                     public void onClick(DialogInterface dialog, int which)

                     {    

                           alertDialog.dismiss();

                     }

              });

              alertDialog.show();

       }

2. Single dialog with multiple usage: 
   - This dialog is not used while you are using Date and Time dialog because it has same method (onCreateDialog). As a result below 3rd option is feasible for custom dialog.
     -Dialog id:
                                     final static int DIALOG_Measurement=100;

                     final static int DIALOG_NumberFormate=101;

     -Call dialog like on Button Tap Event:

                     removeDialog(DIALOG_Measurement);

                     showDialog(DIALOG_Measurement);

                     removeDialog(DIALOG_NumberFormate);

                     showDialog(DIALOG_NumberFormate);

Method:

protected Dialog onCreateDialog(int id) {

              AlertDialog dialog = null;

              AlertDialog.Builder builder = null;

              switch(id)

              {

              case DIALOG_Measurement:

                     final CharSequence[] items = {"Imperial","Metric"};

                     builder = new AlertDialog.Builder(this);

                     builder.setTitle("Select Options");

                     builder.setItems(items, new DialogInterface.OnClickListener()

                     {

                           public void onClick(DialogInterface dialog, int item) {

                                  String name=items[item].toString();

                                  TextView txt=(TextView) findViewById(R.id.txt_meas_name);

                                  txt.setText(name);               

                           }                   

                     });

                     builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()

                     {

                           public void onClick(DialogInterface dialog, int id) {

                                  dialog.cancel();

                           }

                     });

                     dialog = builder.create();

                     break;

              case DIALOG_NumberFormate:

                     final CharSequence[] items1 = {"1000","1,000","1000.00"};

                     builder = new AlertDialog.Builder(this);

                     builder.setTitle("Select Options");

                     builder.setItems(items1, new DialogInterface.OnClickListener()

                     {

                           public void onClick(DialogInterface dialog, int item) {

                                  String name=items1[item].toString();

                                  TextView txt=(TextView) findViewById(R.id.txt_NumFormate_Value);

                                  txt.setText(name);               

                           }

                     });          

                     builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener()

                     {

                           public void onClick(DialogInterface dialog, int id) {

                                  dialog.cancel();

                           }

                     });

                     dialog = builder.create();

                     break;

              }

              return dialog;

       }

2. Custom dialog for user selection:

       private static final int PAIDWITH_CODE=101                     

       String[] temp = null;

       String Paidwith[]={"Visa","MC"};

       temp=Paidwith;  

       showSimplePopUp(PAIDWITH_CODE,"Select Paid with");

 Method:

       private void showSimplePopUp(final int id,String title)

       {

              CharSequence[] itemsPhoto = temp;

              AlertDialog.Builder helpBuilder = new AlertDialog.Builder(this);

              helpBuilder.setTitle(title);

              //helpBuilder.setMessage("This is a Simple Pop Up");

              helpBuilder.setItems(itemsPhoto, new DialogInterface.OnClickListener()

              {

                     public void onClick(DialogInterface dialog, int item)

                     {

                           if (id == PAIDWITH_CODE)

                           {  

                                  String paidwith=temp[item].toString();

                                  txt_paidwith.setText(paidwith);

                           }   

                     }

              });

              // Remember, create doesn't show the dialog

              AlertDialog helpDialog = helpBuilder.create();

              helpDialog.show();

       }

Alarm Service in android

Here we are setting the time to 10 seconds so after 10 seconds a Toast pops up.
For receiving the Broadcast we have to create a class the extends the BroadcastReceiver class on which the onReceive function gets called when the service ends
main.xml

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="vertical" android:padding="4dip"

    android:gravity="center_horizontal"

    android:layout_width="fill_parent" android:layout_height="fill_parent">

    <TextView

        android:layout_width="fill_parent" android:layout_height="wrap_content"

        android:layout_weight="0"

        android:paddingBottom="4dip"

        android:text="Alarm Demo"/>

    <Button android:id="@+id/one_shot"

        android:layout_width="wrap_content" android:layout_height="wrap_content"

        android:text="Start Alarm">

        <requestFocus />

    </Button>

</LinearLayout>

AndroidManifest :

<?xml version="1.0" encoding="utf-8"?>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

    package="com.hb"

    android:versionCode="1"

    android:versionName="1.0" >

    <application

        android:icon="@drawable/icon"

        android:label="@string/app_name" >

        <activity

            android:name=".AlarmDemo"

            android:label="@string/app_name" >

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

        <receiver

            android:name=".MyAlarmReceiver"

            android:process=":remote" />

    </application>

</manifest>

MyAlarmReceiver.class

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.Intent;

import android.widget.Toast;

public class MyAlarmReceiver extends BroadcastReceiver

{

    @Override

    public void onReceive(Context context, Intent intent)

    {

Toast.makeText(context, "Alarm Received after 10 seconds.", Toast.LENGTH_SHORT).show();

    }

}

AlarmDemo.class

import android.os.Bundle;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.Toast;

public class AlarmDemo extends Activity {

       Toast mToast;

       @Override

       protected void onCreate(Bundle savedInstanceState) {

              super.onCreate(savedInstanceState);

              setContentView(R.layout.main);

              Button button = (Button)findViewById(R.id.one_shot);

              button.setOnClickListener(mOneShotListener);

       }

       private OnClickListener mOneShotListener = new OnClickListener() {

              public void onClick(View v) {

                     Intent intent = new Intent(AlarmDemo.this,MyAlarmReceiver.class);

                     PendingIntent sender = PendingIntent.getBroadcast(AlarmDemo.this,

                                  0, intent, 0);

                     // We want the alarm to go off 10 seconds from now.

                     Calendar calendar = Calendar.getInstance();

                     calendar.setTimeInMillis(System.currentTimeMillis());

                     calendar.add(Calendar.SECOND, 10);

                     // Schedule the alarm!

                     AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);

                     am.set(AlarmManager.RTC_WAKEUP, calendar.getTimeInMillis(), sender);

                     // Tell the user about what we did.

                     if (mToast != null) {

                           mToast.cancel();

                     }

                     mToast = Toast.makeText(AlarmDemo.this,"Alarm Started",

                                  Toast.LENGTH_LONG);

                     mToast.show();

              }

       };

}