AlertDialogActivity.java

package com.materialdoc.ui.activity;

import android.app.Activity;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;

import com.materialdoc.R;

public class AlertDialogActivity extends AppCompatActivity {

    public static void start(@NonNull Activity activity) {
        Intent intent = new Intent(activity, AlertDialogActivity.class);
        activity.startActivity(intent);
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ac_dialog_alert);

        Button btnShowDialog = (Button) findViewById(R.id.btnShowDialog);
        btnShowDialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showDialog();
            }
        });

        Button btnShowStylesDialog = (Button) findViewById(R.id.btnShowStylesDialog);
        btnShowStylesDialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showStyledDialog();
            }
        });
    }

    private void showDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle(getString(R.string.dialog_title));
        builder.setMessage(getString(R.string.dialog_message));

        String positiveText = getString(android.R.string.ok);
        builder.setPositiveButton(positiveText,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // positive button logic
                    }
                });

        String negativeText = getString(android.R.string.cancel);
        builder.setNegativeButton(negativeText,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // negative button logic
                    }
                });

        AlertDialog dialog = builder.create();
        // display dialog
        dialog.show();
    }

    private void showStyledDialog() {
        AlertDialog.Builder builder = new AlertDialog.Builder(this, R.style.MyDialogTheme);
        builder.setTitle(getString(R.string.dialog_title));
        builder.setMessage(getString(R.string.dialog_message));

        String positiveText = getString(android.R.string.ok);
        builder.setPositiveButton(positiveText,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // positive button logic
                    }
                });

        String negativeText = getString(android.R.string.cancel);
        builder.setNegativeButton(negativeText,
                new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        // negative button logic
                    }
                });

        AlertDialog dialog = builder.create();
        // display dialog
        dialog.show();
    }
}