<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://s...content-available-to-author-only...d.com/apk/res/android"
    xmlns:app="http://s...content-available-to-author-only...d.com/apk/res-auto"
    xmlns:tools="http://s...content-available-to-author-only...d.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.chengforapp.myapplication.MainActivity">

    <TextView
        android:id="@+id/txtShow"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <Button
        android:id="@+id/btn_paired"
        android:layout_width="101dp"
        android:layout_height="69dp"
        android:layout_marginBottom="8dp"
        android:layout_marginStart="8dp"
        android:text="paired"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

    <Button
        android:id="@+id/btn_conn"
        android:layout_width="110dp"
        android:layout_height="67dp"
        android:layout_marginBottom="8dp"
        android:layout_marginEnd="8dp"
        android:text="find "
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent" />

    <ListView
        android:id="@+id/Show_B_List"
        android:layout_width="368dp"
        android:layout_height="122dp"
        android:layout_marginBottom="8dp"
        android:layout_marginTop="8dp"
        app:layout_constraintBottom_toTopOf="@+id/DangerText"
        app:layout_constraintTop_toBottomOf="@+id/txtShow"
        tools:layout_editor_absoluteX="8dp" />

    <TextView
        android:id="@+id/DangerText"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginBottom="8dp"
        android:text="TextView"
        app:layout_constraintBottom_toBottomOf="parent"
        tools:layout_editor_absoluteX="154dp" />

    <ImageView
        android:id="@+id/pmimage"
        android:layout_width="wrap_content"
        android:layout_height="245dp"
        app:srcCompat="@drawable/a000"
        tools:layout_editor_absoluteX="0dp"
        tools:layout_editor_absoluteY="0dp" />

    <TextView
        android:id="@+id/DATE"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="TextView"
        tools:layout_editor_absoluteX="26dp"
        tools:layout_editor_absoluteY="25dp" />

</android.support.constraint.ConstraintLayout>