Extending AlertDialogs in Android (where to find examples, how to get title and buttons)

Question

I have been looking a lot for examples on how to correctly extend AlertDialogs and get the expected behaviour, but I can hardly find any.

The docs on google doesnt really say much either.

Yes, I know I can use a AlertDialog.Builder to build the most commons things, but for some reasons I want to create my own AlertDialogs (I have code that I want contained in separate java files for one reason).

I have created my PausDialog.java (see code below), it shows up but I am unable to get the title or any of the buttons (positive, negative etc) to show in the Dialog. See this picture:

So, question 1: where can I find good, clean and useful examples on how to correctly extend AlertDialogs and how to use them thereafter

question 2: why can I not see the title or any buttons using the custom AlertDialog below?

---

PausDialog.java

package Test;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.Handler;
import android.os.SystemClock;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.view.WindowManager;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

public class PausDialog extends AlertDialog 
{

    protected PausDialog(Context context) 
    {
        super(context, R.style.DialogTheme);

    }

    @Override
    protected void onCreate(android.os.Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.paus);
        WindowManager.LayoutParams params = getWindow().getAttributes();  
        params.gravity = Gravity.TOP;

        final EditText ed1= (EditText) findViewById(R.id.editTextPausArea);
        final EditText ed2= (EditText) findViewById(R.id.EditTextPausTimeFrom);
        final EditText ed3= (EditText) findViewById(R.id.EditTextPausTimeTo);

        TextView tv1 = (TextView)findViewById(R.id.textViewPausArea);
        tv1.setText(LanguageHandler.GetString("AREA"));
        tv1 = (TextView)findViewById(R.id.textViewPausTime);
        tv1.setText(LanguageHandler.GetString("TIME"));

        setButton(DialogInterface.BUTTON_POSITIVE, "Positive",
            new OnClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which) {

                    int fromArea = 0;
                    int fromTime = 0;
                    int toTime = 0;

                    try
                    {
                        fromArea = Integer.parseInt(ed1.getText().toString());
                        fromTime = Integer.parseInt(ed2.getText().toString());
                        toTime = Integer.parseInt(ed3.getText().toString());

                    }
                    catch(Exception e)
                    {
                        // TODO fail
                    }                       
                }
            });

        setButton(DialogInterface.BUTTON_NEGATIVE, "Negative",
                new OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // Do something
                    }
                });
    }
}

MainActivity.java, calling the PausDialog:

PausDialog pd = new PausDialog(MainActivity.this);
pd.show();

The layout for my PausDialog, paus.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:weightSum="1">
    <RelativeLayout android:gravity="top" android:layout_height="200dp" android:layout_weight="0.11" android:layout_width="304dp">
        <TextView android:layout_alignParentLeft="true" android:text="Område" android:layout_width="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/textViewPausArea" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_marginLeft="17dp" android:layout_marginTop="18dp"></TextView>
        <EditText android:layout_alignBaseline="@+id/textViewPausArea" android:id="@+id/editTextPausArea" android:layout_width="80dp" android:layout_alignBottom="@+id/textViewPausArea" android:inputType="number" android:layout_height="wrap_content" android:layout_toRightOf="@+id/textViewPausArea" android:layout_marginLeft="17dp">
            <requestFocus></requestFocus>
        </EditText>
        <TextView android:text="Tid" android:layout_width="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:layout_below="@+id/editTextPausArea" android:id="@+id/textViewPausTime" android:layout_height="wrap_content" android:layout_marginTop="30dp" android:layout_alignLeft="@+id/textViewPausArea"></TextView>
        <EditText android:layout_alignBaseline="@+id/textViewPausTime" android:id="@+id/EditTextPausTimeFrom" android:layout_width="80dp" android:layout_alignBottom="@+id/textViewPausTime" android:inputType="time" android:layout_height="wrap_content" android:layout_alignLeft="@+id/editTextPausArea"></EditText>
        <TextView android:text=" - " android:layout_width="wrap_content" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/textView3" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/EditTextPausTimeFrom" android:layout_alignBottom="@+id/EditTextPausTimeFrom" android:layout_toRightOf="@+id/EditTextPausTimeFrom"></TextView>
        <EditText android:id="@+id/EditTextPausTimeTo" android:layout_width="80dp" android:inputType="time" android:layout_height="wrap_content" android:layout_alignBaseline="@+id/textView3" android:layout_alignBottom="@+id/textView3" android:layout_toRightOf="@+id/textView3"></EditText>    

    </RelativeLayout>

</LinearLayout>

Answer 1

There are few options to create custom AlertDialog. I just would like to give you answer for current question. You can set title, message and other components of AlertDialog in onCreate() method. But make sure you doing it before you calling super.onCreate() Example:

public class PausDialog extends AlertDialog {
            @Override
            protected void onCreate(Bundle savedInstanceState) {
                View content = LayoutInflater.from(getContext()).inflate(R.layout.dialog_some_view, null);
                setView(content);
                setTitle("Some Title");
                setMessage("Some Message");
                setButton(DialogInterface.BUTTON_POSITIVE, "Ok", new OnClickListener() {
                   @Override
                   public void onClick(DialogInterface dialog, int which) {
                       Log.d("TAG", "BUTTON_POSITIVE");
                   }
                });
                ((TextView) content.findViewById(R.id.data)).setText(R.string.some_custom_data);
                ((TextView) content.findViewById(R.id.description)).setText(getContext().getString(R.string.description));
                setCancelable(false);
                setOnKeyListener((dialog, keyCode, event) -> keyCode == KeyEvent.KEYCODE_BACK);

                super.onCreate(savedInstanceState);
            }
}