android – ConstraintLayout View.GONE用法

<android.support.consTraint.ConsTraintLayout xmlns:android="http://scheR_269_11845@as.android.com/apk/res/android"
        xmlns:app="http://scheR_269_11845@as.android.com/apk/res-auto"
        xmlns:tools="http://scheR_269_11845@as.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.AppCompatImageView
            android:id="@+id/iv_item_small_product_image"
            android:layout_width="113dp"
            android:layout_height="113dp"
            android:layout_marginLeft="7dp"
            android:layout_marginStart="7dp"
            android:BACkground="@android:drawable/btn_radio"
            app:layout_consTraintBottom_toBottomOf="parent"
            app:layout_consTraintLeft_toLeftOf="parent"
            app:layout_consTraintStart_toStartOf="parent"
            app:layout_consTraintTop_toTopOf="parent" />


        <android.support.v7.widget.AppCompatImageView
            android:id="@+id/iv_row_1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:BACkground="@android:drawable/bottom_bar"
app:layout_consTraintLeft_toRightOf="@+id/iv_item_small_product_image"
            app:layout_consTraintright_toRightOf="parent"
            app:layout_consTraintTop_toTopOf="parent" />

        <ro.emag.android.views.FontTextView
            android:id="@+id/tv_row_2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="3dp"
            android:ellipsize="end"
            android:maxLines="2"
            app:layout_consTraintLeft_toRightOf="@+id/iv_item_small_product_image"
            app:layout_consTraintright_toRightOf="parent"
            app:layout_consTraintTop_toBottomOf="@+id/iv_row_1"
            app:layout_goneMarginTop="0dp"
            tools:text="Some text long enough to be split on multiple lines on some devices." />

        <android.support.v7.widget.AppCompatratingBar
            android:id="@+id/rb_row_3_1"
            style="@style/Widget.AppCompat.ratingBar.small"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="9dp"
            android:isInDicator="true"
            android:numStars="5"
            android:stepSize="0.1"
            app:layout_consTraintLeft_toRightOf="@+id/iv_item_small_product_image"
            app:layout_consTraintTop_toBottomOf="@id/tv_row_2" />

        <TextView
            android:id="@+id/tv_row_3_2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="6dp"
            android:layout_marginStart="6dp"
            android:layout_marginTop="9dp"
            app:layout_consTraintLeft_toRightOf="@+id/rb_row_3_1"
            app:layout_consTraintTop_toBottomOf="@id/tv_row_2"
            tools:text="106" />

        <TextView
            android:id="@+id/tv_row_3_3"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="6dp"
            android:layout_marginStart="6dp"
            android:layout_marginTop="9dp"
            app:layout_consTraintLeft_toRightOf="@+id/tv_row_3_2"
            app:layout_consTraintright_toRightOf="parent"
            app:layout_consTraintTop_toBottomOf="@id/tv_row_2"
            app:layout_goneMarginLeft="0dp"
            app:layout_goneMarginStart="0dp"
            tools:text="Options available" />

        <android.support.consTraint.barrier
            android:id="@+id/barrier"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:barrierDirection="bottom"
            app:consTraint_referenced_ids="rb_row_3_1,tv_row_3_2,tv_row_3_3" />

        <TextView
            android:id="@+id/tv_row_4"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginStart="8dp"
            android:layout_marginTop="3dp"
            android:ellipsize="end"
            android:maxLines="1"
            app:layout_consTraintLeft_toRightOf="@+id/iv_item_small_product_image"
            app:layout_consTraintright_toRightOf="parent"
            app:layout_consTraintTop_toBottomOf="@+id/barrier"
            tools:text="Some text on last row" />

    </android.support.consTraint.ConsTraintLayout>

现在,最后一行取决于屏障而不是第三行的其中一个视图.由于障碍取决于第二行的三个视图,因此您不会出现边缘问题.
另外,我注意到你不需要指南.右段可以直接依赖于imageview.

如果你不熟悉障碍,这里有一个link来帮助你.
由于此功能仅在ConsTraintLayout的1.1.0 beta1版本中可用,因此不要忘记将此行添加到build.gradle文件中.

compile 'com.android.support.consTraint:consTraint-layout:1.1.0-beta1'

确保包含maven {url“https://maven.google.com”}