AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("title")
            .setMessage("dialog content")
            .setPositiveButton("ok", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
              }
            })
            .setNegativeButton("cancel", new DialogInterface.OnClickListener() {
              @Override
              public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
              }
            }).show();

import android.support.v7.app.AlertDialog;

Toast.makeText(context, "things happened", Toast.LENGTH_SHORT).show();

package com.gyq.dialog;

import android.content.Context;
import android.widget.Toast;

/**
 * 将Toast封装成一个接口，写在公共的工具类中
 * author: gyq
 * create at 2017/1/11 14:30
 */
public class ToastUtils {
  private static Toast toast;

  public static void showToast(Context context,
                 String content) {
    if (toast == null) {
      toast = Toast.makeText(context,
          content,
          Toast.LENGTH_SHORT);
    } else {
      toast.setText(content);
    }
    toast.show();
  }
}

ToastUtils.showToast(this,"this is a toast !");

compile 'com.android.support:design:24.2.1'

Snackbar.make(mSnackbarBtn,"data delete",Snackbar.LENGTH_LONG)
            .setAction("yes", new View.OnClickListener() {
              @Override
              public void onClick(View v) {

              }
            }).show();