How can I add a third button to an Android Alert Dialog?

This code snippet should help explain the three different buttons you can use:

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


alertDialog.setTitle("Dialog Button");


alertDialog.setMessage("This is a three-button dialog!");


alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "Button 1 Text", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int id) {


//...


} });


alertDialog.setButton(AlertDialog.BUTTON_NEGATIVE, "Button 2 Text", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int id) {


//...


}});


alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "Button 3 Text", new DialogInterface.OnClickListener() {


public void onClick(DialogInterface dialog, int id) {


//...


}});

When you are creating the dialog, add something like this to the builder:

builder = new AlertDialog.Builder(context);
builder.setTitle("Test");
builder.setIcon(R.drawable.icon);
builder.setMessage("test");
builder.setPositiveButton("Call Now",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
dialog.cancel();
}
});


builder.setNeutralButton("Setup",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
context.startActivity(new Intent(context, Setup.class));
//dialog.cancel();
}
});


builder.setNegativeButton("Exit",
new DialogInterface.OnClickListener()
{
public void onClick(DialogInterface dialog, int id)
{
dialog.cancel();
}
});
builder.create().show();

Add any number of buttons without xml:

    AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("Title");
builder.setItems(new CharSequence[]
{"button 1", "button 2", "button 3", "button 4"},
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
// The 'which' argument contains the index position
// of the selected item
switch (which) {
case 0:
Toast.makeText(context, "clicked 1", 0).show();
break;
case 1:
Toast.makeText(context, "clicked 2", 0).show();
break;
case 2:
Toast.makeText(context, "clicked 3", 0).show();
break;
case 3:
Toast.makeText(context, "clicked 4", 0).show();
break;
}
}
});
builder.create().show();

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


// set title
alertDialogBuilder.setTitle("To Do List");


// set dialog message
alertDialogBuilder
.setMessage("What do you want?")
.setCancelable(false)
.setPositiveButton("Delete All", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, close
// current activity








dialog.cancel();




}
}).setNeutralButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, close
// current activity








dialog.cancel();


}
})
.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// if this button is clicked, just close
// the dialog box and do nothing


dialog.cancel();
}
});


// create alert dialog
AlertDialog alertDialog = alertDialogBuilder.create();


// show it
alertDialog.show();

With Jetpack compose M2 you can use the AlertDialog with the buttons parameter:

val openDialog = remember { mutableStateOf(true) }


if (openDialog.value) {
AlertDialog(
onDismissRequest = {
openDialog.value = false
},
title = {
Text(text = "Title")
},
text = {
Text(
"Message area"
)
},
buttons = {
Row(
modifier = Modifier.padding(all = 8.dp),
horizontalArrangement = Arrangement.SpaceBetween
) {
TextButton(onClick = {  }){
Text("First")
}
TextButton(onClick = { }) {
Text("Second")
}
TextButton(onClick = {  }) {
Text("Third")
}
}
}
)
}

With Compose M3 you can use the confirmButton attribute:

  //androidx.compose.material3
AlertDialog(
//..
confirmButton = {
Row(
modifier = Modifier.padding(all = 8.dp),
horizontalArrangement = Arrangement.SpaceBetween
) {
TextButton(onClick = {  }){
Text("First")
}
TextButton(onClick = { }) {
Text("Second")
}
TextButton(onClick = {  }) {
Text("Third")
}
}
}
)

With the Material Components library you can use:

MaterialAlertDialogBuilder(context)
.setTitle(resources.getString(R.string.title))
.setMessage(resources.getString(R.string.supporting_text))
.setNeutralButton(resources.getString(R.string.cancel)) { dialog, which ->
// Respond to neutral button press
}
.setNegativeButton(resources.getString(R.string.decline)) { dialog, which ->
// Respond to negative button press
}
.setPositiveButton(resources.getString(R.string.accept)) { dialog, which ->
// Respond to positive button press
}
.show()