Add Snackbar

app/src/main/java/me/jj97181818/ch07_datetimepicker/MainActivity.java

@@ -2,6 +2,7 @@ package me.jj97181818.ch07_datetimepicker;
 
 import android.app.DatePickerDialog;
 import android.app.TimePickerDialog;
+import android.support.design.widget.Snackbar;
 import android.support.v7.app.AppCompatActivity;
 import android.os.Bundle;
 import android.view.View;
@@ -51,8 +52,10 @@ public class MainActivity extends AppCompatActivity implements View.OnClickListe
         else
             txDate.setText("日期：" + year + "/" + (month + 1) + "/" + dayOfMonth);
 
-        tos.setText("owo");
+        tos.setText("我是一片吐司～～～");
         tos.show();
+
+        Snackbar.make(findViewById(R.id.root), "日期：" + year + "/" + (month + 1) + "/" + dayOfMonth, Snackbar.LENGTH_SHORT).show();
     }
 
     @Override

app/src/main/res/layout/activity_main.xml

@@ -2,6 +2,7 @@
 <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/root"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     tools:context=".MainActivity">