安卓第四次作业

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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">
 
 
    <Button
        android:id="@+id/a1"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_centerInParent="true"
        android:background="#FF7F24"
        />
 
    <Button
        android:id="@+id/a2"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_above="@id/a1"
        android:layout_alignRight="@+id/a1"
        android:background="#BF3EFF"
        />
 
    <Button
        android:id="@+id/a3"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_below="@id/a1"
        android:layout_alignRight="@+id/a1"
        android:background="#B8860B"
        />
 
    <Button
        android:id="@+id/a4"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_above="@id/a1"
        android:layout_toLeftOf="@+id/a1"
        android:background="#969696"
        />
 
    <Button
        android:id="@+id/a5"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_above="@id/a1"
        android:layout_toRightOf="@+id/a1"
        android:background="#7CFC00"
        />
 
    <Button
        android:id="@+id/a6"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_below="@id/a1"
        android:layout_toLeftOf="@+id/a1"
        android:background="#303030"
        />
 
    <Button
        android:id="@+id/a7"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_below="@id/a1"
        android:layout_toRightOf="@+id/a1"
        android:background="#0000FF"
        />
 
    <Button
        android:id="@+id/a8"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_toLeftOf="@id/a1"
        android:layout_alignBottom="@+id/a1"
        android:background="#A0522D"
        />
 
    <Button
        android:id="@+id/a9"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:layout_toRightOf="@id/a1"
        android:layout_alignBottom="@+id/a1"
        android:background="#CD00CD"
        />
 
 
    
 
</RelativeLayout>

 

 

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:orientation="horizontal"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/photo"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:src="@drawable/ic_launcher_background"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="200dp"
        android:layout_marginBottom="30dp"></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"/>
    <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"
        android:layout_centerHorizontal="true">
    </Button>


</RelativeLayout>

package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.annotation.SuppressLint;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
private Button btn_one;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }
    @SuppressLint("WrongConstant")
    public void Click(View view){
        Toast.makeText(this,"你好",0).show();
    }

}