<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="@+id/button13"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginStart="32dp"
android:layout_marginTop="16dp"
android:text="Button"
//设置宽高比例
app:layout_constraintDimensionRatio="H,0.33"
//设置权重
app:layout_constraintHorizontal_weight="1"
app:layout_constraintLeft_toRightOf="@id/imageView2"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<ImageView
android:id="@+id/imageView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="24dp"
app:layout_constraintBottom_toBottomOf="@+id/button13"
app:layout_constraintEnd_toStartOf="@+id/button13"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="@+id/button13"
app:srcCompat="?attr/actionModeCloseDrawable" />
<Button
android:id="@+id/button2"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_marginTop="100dp"
android:text="asdasd"
app:layout_constraintBaseline_toBaselineOf="button3"
app:layout_constraintDimensionRatio="H,3:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_weight="1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/imageView2" />
<Button
android:id="@+id/button3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
//设置横向偏移量,默认居中
app:layout_constraintHorizontal_bias="0.25"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toBottomOf="@id/button2" />
//设置辅助线
<android.support.constraint.Guideline
android:layout_width="wrap_content"
android:layout_height="wrap_content"
// //设置横向以及竖向位置
app:layout_constraintGuide_percent="0.5" />
</android.support.constraint.ConstraintLayout>