协调者布局 简单代码

<?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">
    <!--layout_constraintDimensionRatio宽高比例-->
    <TextView
        android:id="@+id/tv_banner"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:background="#9a9f5f"
        android:gravity="center"
        android:text="协调者布局Banner"
        app:layout_constraintDimensionRatio="16:9"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

    <TextView
        android:id="@+id/view1"
        android:layout_width="140dp"
        android:layout_height="90dp"
        android:layout_margin="10dp"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:text="ImageView"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toBottomOf="@id/tv_banner" />

    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:layout_marginStart="10dp"
        android:ellipsize="end"
        android:lines="3"
        android:text="@string/news"
        android:textSize="16sp"
        app:layout_constraintLeft_toRightOf="@+id/view1"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="@+id/view1" />

    <TextView
        android:id="@+id/tv_time"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginLeft="10dp"
        android:layout_marginStart="10dp"
        android:text="8分钟前"
        android:textSize="14sp"
        app:layout_constraintBottom_toBottomOf="@+id/view1"
        app:layout_constraintLeft_toRightOf="@+id/view1" />
    <!--layout_constraintBaseline_toBaselineOf:基线-->
    <TextView
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginEnd="10dp"
        android:layout_marginRight="10dp"
        android:text="5096点击"
        app:layout_constraintBaseline_toBaselineOf="@+id/tv_time"
        app:layout_constraintRight_toRightOf="parent" />


    <!--layout_constraintHorizontal_weight横向权重-->
    <TextView
        android:id="@+id/tab1"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:background="#ff0000"
        android:gravity="center"
        android:text="tab1"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toLeftOf="@id/tab2" />

    <TextView
        android:id="@+id/tab2"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:background="#00ff00"
        android:gravity="center"
        android:text="tab2"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_weight="2"
        app:layout_constraintLeft_toRightOf="@id/tab1"
        app:layout_constraintRight_toLeftOf="@id/tab3" />

    <TextView
        android:id="@+id/tab3"
        android:layout_width="0dp"
        android:layout_height="40dp"
        android:background="#0000ff"
        android:gravity="center"
        android:text="tab3"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintHorizontal_weight="1"
        app:layout_constraintLeft_toRightOf="@id/tab2"
        app:layout_constraintRight_toRightOf="parent" />
    <!--layout_constraintVertical_bias:纵向百分比-->
    <TextView
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="#612"
        app:layout_constraintHorizontal_bias="0.8"
        app:layout_constraintVertical_bias="0.8"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"

        />


    <!--辅助线，不会真实显示-->
    <android.support.constraint.Guideline
        android:id="@+id/guideline_h"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.8" />

    <!--辅助线，不会真实显示-->
    <android.support.constraint.Guideline
        android:id="@+id/guideline_v"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        app:layout_constraintGuide_percent="0.8" />

    <TextView
        android:layout_width="60dp"
        android:layout_height="60dp"
        android:background="#ff0000"
        app:layout_constraintBottom_toTopOf="@id/guideline_h"
        app:layout_constraintRight_toLeftOf="@id/guideline_v"

        />
</android.support.constraint.ConstraintLayout>