你可以做这样的 -

 公共无效createDialog（）{
    AlertDialog.Builder建设者=新AlertDialog.Builder（本）;
    builder.setMessage（你想从应用程序退出）;
    builder.setCancelable（假）;
    builder.setNegativeButton（否，新DialogInterface.OnClickListener（）{
        公共无效的onClick（DialogInterface对话，诠释它）{
            dialog.cancel（）;
        }
    }）;    builder.setPositiveButton（是，新DialogInterface.OnClickListener（）{
        公共无效的onClick（DialogInterface对话，诠释它）{
            Toast.makeText（MainActivity.this，从应用程序退出
                    Toast.LENGTH_LONG）.show（）;        }
    }）;    AlertDialog警报= builder.create（）;
    alert.show（）;
    按钮n按钮= alert.getButton（DialogInterface.BUTTON_NEGATIVE）;
    nbutton.setBackgroundColor（Color.MAGENTA）;
    按钮pbutton = alert.getButton（DialogInterface.BUTTON_POSITIVE）;
    pbutton.setBackgroundColor（Color.YELLOW）;
}
 

What i am doing: I am creating a custom alert dialog

What i am trying to do: along with below code, How to change the color of action buttons in dialog(positive and negative)

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    // Get the layout inflater
    LayoutInflater inflater = getActivity().getLayoutInflater();

    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    builder.setView(inflater.inflate(R.layout.dialog_signin, null))
    // Add action buttons
           .setPositiveButton(R.string.signin, new DialogInterface.OnClickListener() {
               @Override
               public void onClick(DialogInterface dialog, int id) {
                   // sign in the user ...
               }
           })
           .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int id) {
                   LoginDialogFragment.this.getDialog().cancel();
               }
           });      
    return builder.create();

you can do it like this-

public void createDialog() {
    AlertDialog.Builder builder = new AlertDialog.Builder(this);
    builder.setMessage("Do you want to exit from app");
    builder.setCancelable(false);
    builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();
        }
    });

    builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
            Toast.makeText(MainActivity.this, "You exit from app",
                    Toast.LENGTH_LONG).show();

        }
    });

    AlertDialog alert = builder.create();
    alert.show();
    Button nbutton = alert.getButton(DialogInterface.BUTTON_NEGATIVE);
    nbutton.setBackgroundColor(Color.MAGENTA);
    Button pbutton = alert.getButton(DialogInterface.BUTTON_POSITIVE);
    pbutton.setBackgroundColor(Color.YELLOW);
}