ConstraintLayout简单效果

layout_constraintBaseline_toBaselineOf
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app:layout_constraintCircle="@id/iv_cycle_main"
        app:layout_constraintCircleAngle="45"
        app:layout_constraintCircleRadius="200dp"
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app:layout_constraintVertical_bias="0.3"
        app:layout_constraintHorizontal_bias="0.2"
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app:layout_goneMarginLeft="100dp"
        app:layout_goneMarginTop="200dp"
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app:layout_constraintWidth_default="spread"
        app:layout_constraintHeight_default="spread"
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app:layout_constraintWidth_percent="0.5"
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app:layout_constraintDimensionRatio="1:2"
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app:layout_constraintHorizontal_chainStyle="spread"
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<androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.2"
        />
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<androidx.constraintlayout.widget.Group
        android:id="@+id/tv_group"
        app:constraint_referenced_ids="iv_group1,iv_group2,iv_group3"
        android:layout_width="wrap_content"
        android:visibility="visible"
        android:layout_height="wrap_content"/>
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<androidx.constraintlayout.widget.Placeholder
        android:id="@+id/place1"
        android:layout_width="200dp"
        android:layout_height="200dp"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />
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<androidx.constraintlayout.helper.widget.Flow
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="tvFlow1,tvFlow2,tvFlow3,tvFlow4,tvFlow5"
        app:layout_constraintLeft_toLeftOf="parent"
        app:flow_wrapMode="chain"
        app:layout_constraintTop_toTopOf="parent" />
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<androidx.constraintlayout.helper.widget.Flow
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="tvFlow1,tvFlow2,tvFlow3,tvFlow4,tvFlow5"
        app:layout_constraintLeft_toLeftOf="parent"
        android:orientation="horizontal"
        app:flow_horizontalGap="20dp"
        app:flow_wrapMode="chain"
        app:flow_horizontalStyle="spread_inside"
        app:flow_lastHorizontalStyle="packed"
        app:layout_constraintTop_toTopOf="parent" />
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<androidx.constraintlayout.helper.widget.Flow
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="tvFlow1,tvFlow2,tvFlow3,tvFlow4,tvFlow5"
        app:layout_constraintLeft_toLeftOf="parent"
        app:flow_verticalAlign="top"
        app:flow_wrapMode="chain"
        app:layout_constraintTop_toTopOf="parent" />
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<androidx.constraintlayout.helper.widget.Flow
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        app:constraint_referenced_ids="tvFlow1,tvFlow2,tvFlow3,tvFlow4,tvFlow5"
        app:layout_constraintLeft_toLeftOf="parent"
        app:flow_wrapMode="chain"
        app:flow_maxElementsWrap="3"
        app:layout_constraintTop_toTopOf="parent" />
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<androidx.constraintlayout.helper.widget.Layer
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/shp_round"
        android:padding="10dp"
        app:constraint_referenced_ids="tv_head,tv_footer,tv_left,tv_right"
        tools:ignore="MissingConstraints" />
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app:altSrc="@drawable/shp_round"
        app:crossfade="0.5"
        app:roundPercent="1"
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<androidx.constraintlayout.utils.widget.MockView
        android:id="@+id/mock_icon"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        android:layout_marginLeft="14dp"
        />
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<androidx.constraintlayout.widget.Barrier
        android:id="@+id/barrier"
        android:layout_width="wrap_content"
        app:barrierDirection="end"
        app:constraint_referenced_ids="tv_access,tv_about"
        android:layout_height="wrap_content"/>
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