第三次作业

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.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">

<ImageView
    android:id="@+id/picture"
    android:layout_width="121dp"
    android:layout_height="116dp"
    android:layout_centerHorizontal="true"
    android:layout_marginStart="33dp"
    android:layout_marginLeft="33dp"
    android:layout_marginTop="100dp"
    android:layout_marginEnd="33dp"
    android:layout_marginRight="33dp"
    android:layout_marginBottom="30dp"
    android:src="@drawable/yanzhen"
    app:layout_constraintBottom_toTopOf="@+id/editText1"
    app:layout_constraintEnd_toEndOf="@+id/editText1"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintStart_toStartOf="@+id/editText1"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/textView2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/editText2"
    android:layout_alignLeft="@+id/textView1"
    android:layout_alignBottom="@+id/editText2"
    android:layout_marginStart="48dp"
    android:layout_marginLeft="48dp"
    android:layout_marginEnd="25dp"
    android:layout_marginRight="25dp"
    android:text="密码:"
    android:textSize="20sp"
    app:layout_constraintBaseline_toBaselineOf="@+id/editText2"
    app:layout_constraintEnd_toStartOf="@+id/editText2"
    app:layout_constraintStart_toStartOf="parent" />

<EditText
    android:id="@+id/editText2"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/editText1"
    android:layout_alignLeft="@+id/editText1"
    android:layout_marginEnd="92dp"
    android:layout_marginRight="92dp"
    android:layout_marginBottom="35dp"
    android:ems="10"
    app:layout_constraintBottom_toTopOf="@+id/btn"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/textView2"
    app:layout_constraintTop_toBottomOf="@+id/editText1" />

<TextView
    android:id="@+id/textView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/btn"
    android:layout_alignBottom="@+id/editText1"
    android:layout_marginStart="48dp"
    android:layout_marginLeft="48dp"
    android:layout_marginEnd="25dp"
    android:layout_marginRight="25dp"
    android:text="账号:"
    android:textSize="20sp"
    app:layout_constraintBaseline_toBaselineOf="@+id/editText1"
    app:layout_constraintEnd_toStartOf="@+id/editText1"
    app:layout_constraintStart_toStartOf="parent" />

<Button
    android:id="@+id/btn"
    android:layout_width="250dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/editText2"
    android:layout_alignParentRight="true"
    android:layout_marginBottom="200dp"
    android:background="#3A5FCD"
    android:onClick="click"
    android:text="登录"
    android:textColor="#FFFFFF"
    app:layout_constraintBottom_toTopOf="@+id/tv"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintHorizontal_bias="0.496"
    app:layout_constraintStart_toStartOf="parent"
    app:layout_constraintTop_toBottomOf="@+id/editText2" />

<EditText
    android:id="@+id/editText1"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/picture"
    android:layout_marginEnd="92dp"
    android:layout_marginRight="92dp"
    android:layout_marginBottom="39dp"
    android:layout_toRightOf="@+id/textView1"
    android:ems="10"
    android:textColor="#000000"
    android:textSize="20sp"
    app:layout_constraintBottom_toTopOf="@+id/editText2"
    app:layout_constraintEnd_toEndOf="parent"
    app:layout_constraintStart_toEndOf="@+id/textView1"
    app:layout_constraintTop_toBottomOf="@+id/picture">

    <requestFocus />
</EditText>

<TextView
    android:id="@+id/tv"
    android:layout_width="99dp"
    android:layout_height="44dp"
    android:layout_below="@+id/btn"
    android:layout_centerHorizontal="true"
    android:layout_marginStart="19dp"
    android:layout_marginLeft="19dp"
    android:layout_marginEnd="19dp"
    android:layout_marginRight="19dp"
    android:layout_marginBottom="41dp"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="@+id/editText2"
    app:layout_constraintHorizontal_bias="0.682"
    app:layout_constraintStart_toStartOf="@+id/editText2"
    app:layout_constraintTop_toBottomOf="@+id/btn" />
/>

</android.support.constraint.ConstraintLayout>