SnackBar初步使用

程序功能
1. 点击按钮，弹出snackBar

第一步：添加包
右键项目->open Settings ->dependenices-> + ->找到com.android.support.design -> ok

activity.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout  xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_height="match_parent"
     android:layout_width="match_parent"
    android:orientation="vertical"
    android:id="@+id/constraintLayout"
    >
    <Button
        android:id="@+id/btnShowSnackBar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="4dp"
        android:onClick="showSnackBar"
        android:text="点击出现SnackBar"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.example.tnt.snackbar;
import android.support.design.widget.CoordinatorLayout;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    CoordinatorLayout coordinatorLayout;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        View view = findViewById(R.id.constraintLayout);
//        coordinatorLayout= findViewById(R.id.coordinatorLayout);
    }

    public void showSnackBar(View view) {
        Snackbar.make(view,"这是massage", Snackbar.LENGTH_LONG).setAction("这是action", new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(MainActivity.this,"你点击了action",Toast.LENGTH_SHORT).show();
            }
        }).show();

    }
}