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How to Create A "Do you want to Continue?" Alert Box

In my application I have a button that when pressed I want it to display an Alert Dialog Box that asks if you want to continue. It will have two buttons: a "Continue" and "Do Not Continue". I am putting the method that opens up the dialog box within the method that opens the new Activity like so:
case R.id.bRegister:
try{
//the method for opening the alert box goes somewhere here but i don't know where yet.
Class ourClass = Class.forName("org.health.blablablabla.app.RegisterData");
Intent ourIntent = new Intent(MainActivity.this,ourClass);
finish();
startActivity(ourIntent);
overridePendingTransition(R.animator.fadein,R.animator.fadeout);
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
This is currently what I have for the Alert Dialog Box method:
private void showWarning(){
AlertDialog.Builder warning = new AlertDialog.Builder(this);
warning.setTitle("Existing Data");
warning.setMessage("There is already existing data. If you continue all previous data will be deleted. Are you sure you want to continue?");
warning.setPositiveButton("Continue",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface arg0, int arg1)
{
arg0.dismiss();
}
});
warning.setNegativeButton("Do Not Continue",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// do nothing
}
});
}
My question is where to put the method in the first block of code, and how do I make it so that when the "Do Not Continue" button is pressed, the New Activity "RegisterData" doesn't open up.

you can make an YesNoSampleActivity and use AlertDialog.Builder like this:
public class YesNoSampleActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
//Put up the Yes/No message box
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder
.setTitle("Erase hard drive")
.setMessage("Are you sure?")
.setIcon(android.R.drawable.ic_dialog_alert)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
//Yes button clicked, do something
Toast.makeText(YesNoSampleActivity.this, "Yes button pressed",
Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("No", null) //Do nothing on no
.show();
// Continue code after the Yes/No dialog
// ....
}
}

NullPointerException when focusing on EditText in AlertDialog

I've got a ListView where the cells/rows in that listView contains a button that presents an AlertDialog but when I tap the EditText to enter some text I get a NullPointerException when the ArrayAdapter's getView method returns.
I've tried
android:descendantFocusability="afterDescendants" & "beforeDescendants" on my ListView
and added android:windowSoftInputMode="adjustPan" which is what the similar topics has marked as correct answers but it's not working for me.
AlertDialog.Builder alert = new AlertDialog.Builder(Menu.this);
alert.setTitle(SubApp.pManager.getLanguageObject().getString("AddNoteToFavTitle"));
final EditText input = new EditText(Menu.this);
alert.setView(input);
alert.setPositiveButton("OK", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
saveInfoToPrefs(editor, id, input.getText().toString());
}
});
alert.setNegativeButton(SubApp.pManager.getLanguageObject().getString("No"), new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
saveInfoToPrefs(editor, id, "");
}
});
alert.show();
Does anyone know any other solution to this annoying issue?
Cheers!

alert box in android is not working

The code is not working. Please help me. It print the replace all string, but further code is not running.
when I debug this, there is no error in the code. It will show the code of alert box.
if(count>0)
{
System.out.println("replace all string name ");
// final Intent intent_ul=new Intent(this, UploadExcel.class);
AlertDialog.Builder alertDialogBuilder_ue = new AlertDialog.Builder(this);
alertDialogBuilder_ue.setTitle("Alert!!");
alertDialogBuilder_ue
.setMessage("Are you sure you want to Replace all the data related to this style ? ")
.setCancelable(false)
.setPositiveButton("Yes",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
mySQLiteAdapter.openToWrite();
mySQLiteAdapter.delete_style_measurement(style_no);
Log.d("","yes click");
count=0;
mySQLiteAdapter.close();
}
})
.setNegativeButton("No",new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int id) {
Log.d("","No click");
count++;
dialog.cancel();
// startActivity(intent_ul);
//finish();
}
});
}

Add these lines before the end of if condition
AlertDialog alertDialog = alertDialogBuilder_ue.create();
alertDialog.show();

You need to add
alertDialogBuilder_ue.show();
in your code

Check with this code. This code working for me
Context context = CurrentActivity.this;
AlertDialog.Builder ad = new AlertDialog.Builder(context);
ad.setTitle("Application");
ad.setMessage("Do you want to proceed?");
ad.setPositiveButton("Yes", new OnClickListener()
{
public void onClick(DialogInterface dialog, int arg1)
{
}
});
ad.setNegativeButton("Cancel", new OnClickListener()
{
public void onClick(DialogInterface dialog, int arg1)
{
}
});
ad.setCancelable(false);
ad.show();

In your code adding alertDialogBuilder_ue.show(); should make the dialog appear.
By some people it has been suggested that you have to use alertDialogBuilder_ue.create(); to get a handle to the AlertDialog that you can then use the .show() method on.
Both are possibilities but you don't have to use the .create() option if you don't need a handle to the AlertDialog

Alert Dialog Icon Won't Set

I have a 14x14 png file (icon_alert.png) in my drawable-hdpi folder. This is how I am setting the icon:
alertDialog.setIcon(R.drawable.icon_alert);
The icon is not there when the dialog is shown.

You need a title too, otherwise it won't work.

public class ExampleApp extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
AlertDialog.Builder alt_bld = new AlertDialog.Builder(this);
alt_bld.setMessage("Do you want to close this window ?")
.setCancelable(false)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Action for 'Yes' Button
}
})
.setNegativeButton("No", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// Action for 'NO' Button
dialog.cancel();
}
});
AlertDialog alert = alt_bld.create();
// Title for AlertDialog
alert.setTitle("Title");
// Icon for AlertDialog
alert.setIcon(R.drawable.icon);
alert.show();
}
}

You can use alertDialog.setIcon(R.drawable.icon);
The icon must be either .png or .jpg, I would highly recommend 16X16.

How to raise a Toast on top of a AlertDialog?

I am validating an AlertDialog, and I would like to raise a Toast on top of the AlertDialog display.
I have this code, but the Toast is displayed on the activity
new AlertDialog.Builder(this).setTitle(R.string.contact_groups_add)
.setView(addView).setPositiveButton(R.string.ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
if (wrapper.getTitle().length()>0)
{
processAdd(wrapper);
} else {
Toast.makeText(getApplicationContext(), "Name is required", Toast.LENGTH_SHORT).show();
}
}
}).setNegativeButton(R.string.cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,
int whichButton) {
// ignore, just dismiss
}
}).show();

Instead of using AdvertDialog.Builder, you can create a custom dialog which will behave like a dialog, but is in fact a normal activity. Your toasts should be drawn normally on top of this.

Had this problem myself as well, when I wanted to show a validation message within a dialog.
The answer that seanhodges gave is probably the cleaner and better way. But a seperate activity wasnt practical for me, so i came up with this solution.
Anyway, you can use the AlerDialog.Builder, and show a toast.
If you override the OnClickListener of the button the you want to trigger the toast, you can show a toast on top of a dialog.
An example;
public void showToastOnDialog(final Context context) {
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Dialog title");
builder.setMessage("Dialog message");
builder.setPositiveButton(android.R.string.ok, new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// Do nothing, you will be overriding this anyway
}
});
builder.setNegativeButton(android.R.string.cancel,
new OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
// You can implement code here, because you wont be
// overriding this
}
});
final AlertDialog dialog = builder.create();
// Make sure you show the dialog first before overriding the
// OnClickListener
dialog.show();
// Notice that I`m not using DialogInterface.OnClicklistener but the
// View.OnClickListener
dialog.getButton(Dialog.BUTTON_POSITIVE).setOnClickListener(
new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast toast = Toast.makeText(context,
"I`m a toast on top of a dialog.",
Toast.LENGTH_LONG);
toast.show();
// Because you are overriding the OnClicklistener, the
// dialog will not auto dismiss
// after clicking
dialog.dismiss();
}
});
}

Try this:
AlertDialog.getWindow().setType(WindowManager.LayoutParams.TYPE_PHONE);