activity doesn't wait untill alertdialog completes - Android Q&A, Help & Troubleshooting

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package com.connection.phonedetails;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.Toast;
public class Test extends Activity {
private static final int REQUEST_CODE = 10;
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.alert);
DatabaseHandler db = new DatabaseHandler(this);
Intent intent = new Intent(this,AlertDialogExample.class);
startActivityForResult(intent,REQUEST_CODE);
}
@override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 10) {
if(resultCode == RESULT_OK){
String result=data.getStringExtra("TYPE");
Toast.makeText(getApplicationContext(),"Your sim type iss POST paidddddddddd", Toast.LENGTH_LONG).show();
}
if (resultCode == RESULT_CANCELED) {
Toast.makeText(getApplicationContext(),"Your sim type iss PREEEEE paidddddddddd", Toast.LENGTH_LONG).show();
}
}
}
}
this is alert dialog activity.
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package com.connection.phonedetails;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
public class AlertDialogExample extends Activity {
// this context will use when we work with Alert Dialog
final Context context = this;
// just for test, when we click this button, we will see the alert dialog.
private Button button;
@override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.alert);
/* Alert Dialog Code Start*/
AlertDialog.Builder alert = new AlertDialog.Builder(context);
alert.setTitle("Select Your SIM Type"); //Set Alert dialog title here
//alert.setMessage("Enter your Name Here"); //Message here
alert.setPositiveButton("Post Paid", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// String value = input.getText().toString();
// Do something with value!
//You will get input data in this variable.
Toast.makeText(getApplicationContext(),"Post Paid", Toast.LENGTH_LONG).show();
//db.addContact(new SimDetails( telephonyManager.getSimSerialNumber(), telephonyManager.getNetworkOperatorName(),"Post"));
Intent returnIntent = new Intent();
returnIntent.putExtra("TYPE","POST Paid");
setResult(RESULT_OK,returnIntent);
finish();
}
});
alert.setNegativeButton("Pre Paid", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
// Canceled.
Toast.makeText(getApplicationContext(),"Pre Paid", Toast.LENGTH_LONG).show();
Intent returnIntent = new Intent();
returnIntent.putExtra("TYPE","PRE Paid");
setResult(RESULT_CANCELED,returnIntent);
finish();
}
});
AlertDialog alertDialog = alert.create();
alertDialog.show();
/* Alert Dialog Code End*/
}
/*
@override
public void finish() {
Intent data = new Intent();
// Return some hard-coded values
data.putExtra("TYPE", "Swinging on a star. ");
data.putExtra("returnKey2", "You could be better then you are. ");
setResult(RESULT_OK, data);
super.finish();
}*/
}
this is working fine.Anyway if added the below two line end Oncreate method of the main activity it doesn't wait untill the alert dialog finishes.it goes to contact activity .So i don't have chance to select option from alert dialog.how to avoid this situation?
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Intent contact = new Intent(getApplicationContext(),Contacts.class);
startActivity(contact);