android的按钮(Button)的实例解析

运行效果

在xml添加代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#EFEFF4"
    android:orientation="vertical"
    android:paddingBottom="16dp"
    android:paddingLeft="16dp"
    android:paddingRight="16dp"
    android:paddingTop="16dp"
    tools:context=".MainActivity">

    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="604dp"
        android:scaleType="fitStart"
        android:src="@drawable/login2" />

    <Button
        android:id="@+id/login"
        android:layout_width="match_parent"
        android:layout_height="61dp"
        android:background="#2196F3"
        android:text="授权并登录"
        android:textColor="#FFFFFF"
        android:textSize="20dp" />

</LinearLayout>

在Java文件添加代码

package com.example.wangzhelogin2;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button login=(Button)findViewById(R.id.login);
        login.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                Toast.makeText(MainActivity.this,"你已授权登录王者荣耀",Toast.LENGTH_LONG).show();
            }
        });
    }
    } 

本文地址：https://blog.csdn.net/qq_44716544/article/details/107898803