<?xml version="1.0" encoding="utf-8"?> <androidx.constraintlayout.widget.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:layout_width="match_parent" android:layout_height="match_parent" tools:context=".MainActivity"> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingTop="200dp" android:paddingLeft="20dp"> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn1" android:text="111" android:background="#528654"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn2" android:text="222" android:layout_toRightOf="@id/btn1" android:background="#896899"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn3" android:text="333" android:layout_toRightOf="@id/btn2" android:background="#212360"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn4" android:text="444" android:layout_below="@id/btn1" android:background="#FF2589"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn5" android:text="555" android:layout_below="@id/btn1" android:layout_toRightOf="@id/btn4" android:background="#008854"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn6" android:text="666" android:layout_below="@id/btn1" android:layout_toRightOf="@id/btn5" android:background="#788877"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn7" android:text="777" android:layout_below="@id/btn4" android:background="#896888"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn8" android:text="888" android:layout_below="@id/btn4" android:layout_toRightOf="@id/btn7" android:background="#DD4588"> </Button> <Button android:layout_width="80dp" android:layout_height="80dp" android:id="@+id/btn9" android:text="999" android:layout_below="@id/btn4" android:layout_toRightOf="@id/btn8" android:background="#AA2548"> </Button> </RelativeLayout> </androidx.constraintlayout.widget.ConstraintLayout> <?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"> <ImageView android:id="@+id/photo" android:layout_width="80dp" android:layout_height="80dp" android:layout_centerInParent="true" android:src="@drawable/photo"></ImageView> <TextView android:id="@+id/textView1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/photo" android:maxLength="15" android:layout_marginTop="13dp" android:text="账号:"/> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/photo" android:layout_toRightOf="@id/textView1" android:hint="请输入您的账号"></EditText> <TextView android:id="@+id/textView2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@id/textView1" android:maxLength="20" android:layout_marginTop="25dp" android:text="密码:" /> <EditText android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_below="@id/textView1" android:layout_toRightOf="@id/textView2" android:layout_marginTop="10dp" android:hint="请输入您的密码"> </EditText> <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/button" android:text="登录" android:textColor="#478595" android:layout_below="@id/textView2" android:layout_marginTop="20dp" android:layout_marginLeft="120dp" android:onClick="click"> </Button> </RelativeLayout> package com.example.myhomework1; import androidx.appcompat.app.AppCompatActivity; import android.os.Bundle; import android.view.View; import android.widget.Button; public class MainActivity extends AppCompatActivity { private Button mybutton_one; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mybutton_one = (Button) findViewById(R.id.button); } public void click(View view){ mybutton_one.setText("登录按钮被点击"); } }