<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="

http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@mipmap/p1">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:orientation="vertical"
android:padding="30dp">
<TextView
android:id="@+id/text1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:drawableLeft="@mipmap/p2"
android:text="QQ"
android:layout_marginLeft="100dp"
android:textSize="40sp" />
<EditText
android:id="@+id/edt1"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="35dp"
android:hint="QQ號/郵箱/手機號"
android:textSize="30dp"/>
<EditText
android:id="@+id/edt2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:hint="密碼"
android:password="true"
android:textSize="30dp"/>
<Button
android:id="@+id/btn1"
android:layout_width="match_parent"
android:layout_margin="10dp"
android:layout_height="wrap_content"
android:text="登陸"
android:textSize="35sp"
android:background="#87CEFF"
android:onClick="click"
/>
</LinearLayout>
</RelativeLayout>
二:
package com.example.myapplication; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View.OnClickListener; import android.view.View; import android.widget.EditText; import android.widget.Button; import android.widget.Toast; public class MainActivity extends AppCompatActivity { private Button btn1; EditText account = null; EditText code = null; EditText t1; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); t1=(EditText) findViewById(R.id.edt1); account = (EditText) findViewById(R.id.edt1); code = (EditText) findViewById(R.id.edt2); btn1=(Button) findViewById(R.id.btn1); btn1.setOnClickListener(new OnClickListener() { @Override public void onClick(View view) { String username = ((EditText) findViewById(R.id.edt1)).getText().toString(); String pwd = ((EditText) findViewById(R.id.edt2)).getText().toString(); if (username.equals("123456") && pwd.equals("123456")) { Toast.makeText(MainActivity.this,"登錄成功",Toast.LENGTH_SHORT).show(); } else { t1.setText("帳號或密碼錯誤請從新輸入"); Toast.makeText(MainActivity.this,"登錄失敗",Toast.LENGTH_SHORT).show(); } } }); } }