第四次android作业

<?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">

    <Button
        android:id="@+id/button"
        android:background="#000000"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button2"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginStart="86dp"
        android:layout_marginLeft="86dp"
        android:background="#000FF0"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.499" />

    <Button
        android:id="@+id/button3"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#00DA00"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/button4"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#000000"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/button2"
        app:layout_constraintEnd_toStartOf="@+id/button3" />

    <Button
        android:id="@+id/button5"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#000000"
        android:text="Button"
        app:layout_constraintBottom_toTopOf="@+id/button6"
        app:layout_constraintStart_toEndOf="@+id/button3" />

    <Button
        android:id="@+id/button6"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#00DA00"
        android:text="Button"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toEndOf="@+id/button"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/button7"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:layout_marginStart="86dp"
        android:layout_marginLeft="86dp"
        android:background="#00DA00"
        android:text="Button"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button2" />

    <Button
        android:id="@+id/button8"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#00FFF0"
        android:text="Button"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.501"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/button" />

    <Button
        android:id="@+id/button9"
        android:layout_width="80dp"
        android:layout_height="80dp"
        android:background="#000000"
        android:text="Button"
        app:layout_constraintStart_toEndOf="@+id/button8"
        app:layout_constraintTop_toBottomOf="@+id/button6" />

</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: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>