第四周

<?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="#977A66"
        />

    <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="#206005"
        android:layout_alignEnd="@+id/a1" />

    <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="#B1810A"
        android:layout_alignEnd="@+id/a1" />

    <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="#FFFEFE"
        android:layout_toStartOf="@+id/a1" />

    <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="#123F6C"
        android:layout_toEndOf="@+id/a1" />

    <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="#769E46"
        android:layout_toStartOf="@+id/a1" />

    <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="#B513B5"
        android:layout_toEndOf="@+id/a1" />

    <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="#851C1C"
        android:layout_toStartOf="@id/a1" />

    <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="#33BA7B"
        android:layout_toEndOf="@id/a1" />
</RelativeLayout>

<?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/bpworry"></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"
        android:layout_toEndOf="@id/textView1" />


    <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"
        android:layout_toEndOf="@id/textView2">
    </EditText>

    <Button
        android:layout_width="match_parent"
        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:onClick="click">
    </Button>

</RelativeLayout>