登录界面

package com.example.administrator.myapplication;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);

       /* 按钮提示
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(v.getContext(),"你点击了登录按钮1",Toast.LENGTH_LONG).show();
            }
        });*/

        //button.setOnClickListener((View.OnClickListener) MainActivity.this);
        button.setOnClickListener(clickListener);
    }
    View.OnClickListener clickListener = new  View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Toast.makeText(MainActivity.this, "你点击了登录按钮1", Toast.LENGTH_LONG).show();
        }
    };
}

<?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:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:orientation="vertical"
    tools:context="com.example.administrator.myapplication.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="28dp"
        android:text="欢迎使用该应用"
        android:layout_gravity="center"
        android:autoLink="web"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="number"
        android:hint="请输入帐号:"/>
    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:hint="请输入密码:"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#FF4801"
        android:text="登录"
        android:id="@+id/button"/>
</LinearLayout>