Android-CardView内容未显示

Question

I am trying to create three CardView , with each of them containing some ImageView and TextView . I am not using RecyclerView as I will always have these 3 CardViews in that activity. But why are the contents of the CardView such as the texts being displayed (both in Preview and the app) ?

This is what I get:

Here is my XML code for the activity. I have set the corresponding values in strings.xml .

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.example.yankee.cw.ll_home">

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        app:cardUseCompatPadding="true"
        android:id="@+id/card_view0"
        android:layout_gravity="center"
        android:padding="16dp"
        android:clickable="true"
        card_view:contentPadding="24dp"
        android:foreground="?android:attr/selectableItemBackground"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        card_view:cardBackgroundColor="@color/cardview_light_background"
        card_view:cardElevation="@dimen/cardview_default_elevation"
        card_view:cardCornerRadius="4dp">
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:weightSum="1"
            android:layout_height="0dp">
            <ImageView
                android:layout_width="0dp"
                android:layout_weight="0.15"
                android:layout_height="match_parent" />
            <TextView
                android:layout_width="0dp"
                android:layout_weight="0.70"
                android:layout_gravity="center"
                android:textAllCaps="true"
                android:text="@string/ll_home_card_title_1"
                android:layout_height="match_parent" />
            <ImageView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.15"/>
        </LinearLayout>
        <TextView
            android:layout_width="match_parent"
            android:text="@string/ll_home_card_content_1"
            android:layout_height="0dp" />
    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        app:cardUseCompatPadding="true"
        android:id="@+id/card_view1"
        android:layout_gravity="center"
        android:padding="16dp"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        card_view:cardBackgroundColor="@color/cardview_light_background"
        card_view:cardElevation="@dimen/cardview_default_elevation"
        card_view:cardCornerRadius="4dp">
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:weightSum="1"
            android:layout_height="0dp">
            <ImageView
                android:layout_width="0dp"
                android:layout_weight="0.15"
                android:layout_height="match_parent" />
            <TextView
                android:layout_width="0dp"
                android:layout_weight="0.70"
                android:layout_gravity="center"
                android:textAllCaps="true"
                android:text="@string/ll_home_card_title_2"
                android:layout_height="match_parent" />
            <ImageView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.15"/>
        </LinearLayout>
        <TextView
            android:layout_width="match_parent"
            android:text="@string/ll_home_card_content_2"
            android:layout_height="0dp" />
    </android.support.v7.widget.CardView>

    <android.support.v7.widget.CardView
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        app:cardUseCompatPadding="true"
        android:id="@+id/card_view2"
        android:layout_gravity="center"
        android:clickable="true"
        android:foreground="?android:attr/selectableItemBackground"
        android:padding="16dp"
        android:layout_width="match_parent"
        android:layout_height="200dp"
        card_view:cardBackgroundColor="@color/cardview_light_background"
        card_view:cardCornerRadius="4dp">
        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="match_parent"
            android:weightSum="1"
            android:layout_height="0dp">
            <ImageView
                android:layout_width="0dp"
                android:layout_weight="0.15"
                android:layout_height="match_parent" />
            <TextView
                android:layout_width="0dp"
                android:layout_weight="0.70"
                android:layout_gravity="center"
                android:textAllCaps="true"
                android:text="@string/ll_home_card_title_3"
                android:layout_height="match_parent" />
            <ImageView
                android:layout_width="0dp"
                android:layout_height="match_parent"
                android:layout_weight="0.15"/>
        </LinearLayout>
        <TextView
            android:layout_width="match_parent"
            android:text="@string/ll_home_card_content_3"
            android:layout_height="0dp" />

    </android.support.v7.widget.CardView>

</LinearLayout>
</ScrollView>

Answer 1

您需要将LinearLayout中的高度设置为match_parent，而不是0dp，而且每个CardView中的最后一个TextView都设置为0高度，因此您应该更改它，可以在LinearLayout内使用权重，但不能在其上使用（除非它在其他linearlayout内） ）