複雜背景圖，如何佈局

複雜背景圖，如何佈局

        在項目經常會遇到，產品經理給定了一張背景圖片，需要在背景圖指定的位置放入適合的控件，進行展示。今天說下如何使用ConstraintLayout實現佈局，ConstraintLayout的基礎大家自己搜索下。下面我們先展示一張圖片。

        給定了這樣的一幅圖片，你會如何進行佈局呢？下面我們開始佈局吧。

        從圖片上我們可以看出，整個圖片可以分6部分，那麼每部分的大小如何確定呢？我們可以用ps軟件或者其它繪圖工具，確認每部分的高度，所有部分的高度加起來就是整張圖片的高度了。在ConstraintLayout中constraintVertical_weight屬性實現了和LinearLayout中設置layout_weight相同的效果(佔比權重)。通過constraintVertical_weight，我們實現了將整個佈局分隔從6部分。以下是具體的分隔佈局

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorActivityBackground"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="MissingConstraints">

    <LinearLayout
        android:id="@+id/ll3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll2"
        app:layout_constraintVertical_weight="740">
    </LinearLayout>

    <LinearLayout
        android:id="@+id/llback"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@mipmap/beehive"
        android:orientation="horizontal"></LinearLayout>

    <LinearLayout
        android:id="@+id/ll1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_weight="436"></LinearLayout>

    <LinearLayout
        android:id="@+id/ll2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll1"
        app:layout_constraintVertical_weight="140">

    </LinearLayout>


    <LinearLayout
        android:id="@+id/ll4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll5"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll3"
        app:layout_constraintVertical_weight="180">
    </LinearLayout>

    <LinearLayout
        android:id="@+id/ll5"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll4"
        app:layout_constraintVertical_weight="424">
    </LinearLayout>
</android.support.constraint.ConstraintLayout>

        在佈局中，我們把第三部分放置在最前面，因爲第三部的部分需要背景圖片遮擋住部分，所以需要放置在背景圖之前進行佈局。整個佈局框架基本完成了。以下是最終的佈局。圖片之類的需要大家自己腦補了

<?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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/colorActivityBackground"
    xmlns:tools="http://schemas.android.com/tools"
    tools:ignore="MissingConstraints">

    <LinearLayout
        android:id="@+id/ll3"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:gravity="center_vertical"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll4"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll2"
        app:layout_constraintVertical_weight="740">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="154">
        </LinearLayout>

        <!--adnroid 4.4 RecyclerView need fix size if item size lager. otherwise,it's will culculate the size with all data!-->
        <com.zzy.jackpot.jackpotRecyclerView
            android:id="@+id/recyler1"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></com.zzy.jackpot.jackpotRecyclerView>

        <com.zzy.jackpot.jackpotRecyclerView
            android:id="@+id/recyler2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_marginLeft="16dp"
            android:layout_marginRight="16dp"></com.zzy.jackpot.jackpotRecyclerView>

        <com.zzy.jackpot.jackpotRecyclerView
            android:id="@+id/recyler3"
            android:layout_width="match_parent"
            android:layout_height="match_parent"></com.zzy.jackpot.jackpotRecyclerView>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="160"></LinearLayout>

    </LinearLayout>

    <LinearLayout
        android:id="@+id/llback"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@mipmap/beehive"
        android:orientation="horizontal"></LinearLayout>

    <LinearLayout
        android:id="@+id/ll1"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll2"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_weight="436"></LinearLayout>

    <LinearLayout
        android:id="@+id/ll2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll3"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll1"
        app:layout_constraintVertical_weight="140">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="154"></LinearLayout>


        <com.sunfusheng.marqueeview.MarqueeView
            android:id="@+id/tvScroll"
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="772"
            app:mvAnimDuration="2000"
            app:mvDirection="bottom_to_top"
            app:mvInterval="5000"
            app:mvSingleLine="false"
            app:mvGravity="center"
            app:mvTextColor="@color/black"
            app:mvTextSize="16dp" />


        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="154"></LinearLayout>
    </LinearLayout>


    <LinearLayout
        android:id="@+id/ll4"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toTopOf="@id/ll5"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll3"
        app:layout_constraintVertical_weight="180">

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="381"></LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="384"
            android:orientation="vertical">

            <TextView
                android:id="@+id/textView5"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_horizontal"
                android:text="You have"
                android:textColor="@color/white"
                android:textSize="16dp"
                android:textStyle="bold" />

            <TextView
                android:id="@+id/tvSpinNum"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_horizontal"
                android:textSize="20dp"
                android:text="100 Spins"
                android:textColor="@color/white"
                android:textStyle="bold" />

        </LinearLayout>

        <LinearLayout
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_weight="381"></LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:id="@+id/ll5"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:orientation="vertical"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/ll4"
        app:layout_constraintVertical_weight="424">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="180"
            android:gravity="center"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/btnPlay"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:scaleType="fitCenter"
                android:src="@mipmap/buttom_play" />
        </LinearLayout>


        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginBottom="10dp"
            android:layout_weight="152"
            android:gravity="center"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/btnPrizes"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="28dp"
                android:src="@mipmap/buttom_prizes" />


            <LinearLayout
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1"></LinearLayout>

            <ImageView
                android:id="@+id/btnGetSpin"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="28dp"
                android:src="@mipmap/buttom_get_spin" />

        </LinearLayout>


    </LinearLayout>


</android.support.constraint.ConstraintLayout>