下面的xml文件正确吗？

问题描述 投票：1回答：1

下面的xml文件正确吗？我正在尝试在回收者视图中显示从sqlite获取的信息。

下面的xml文件正确吗？我正在尝试在回收者视图中显示从sqlite获取的信息。

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="150dp">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <TextView
                android:id="@+id/textView2"
                android:layout_width="3dp"
                android:layout_height="23dp"
                android:textSize="20sp"
                android:textStyle="bold"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.2"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.3" />

            <TextView
                android:id="@+id/semester"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.15"
                app:layout_constraintStart_toEndOf="@+id/textView2"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.3" />

            <TextView
                android:id="@+id/textView32"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="SGPA"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.2"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.7" />

            <TextView
                android:id="@+id/textView33"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Percentage"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.6"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.70" />

            <TextView
                android:id="@+id/textV"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="@+id/textView32"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.08"
                app:layout_constraintStart_toEndOf="@+id/textView32"
                app:layout_constraintTop_toTopOf="@+id/textView32"
                app:layout_constraintVertical_bias="0.0" />

            <TextView
                android:id="@+id/textVw"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                app:layout_constraintBottom_toBottomOf="@+id/textView33"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.08"
                app:layout_constraintStart_toEndOf="@+id/textView33"
                app:layout_constraintTop_toTopOf="@+id/textView33" />

            <TextView
                android:id="@+id/scheme1"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="10sp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.95"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.95" />

            <ImageButton
                android:id="@+id/btndelete1"
                android:layout_width="30dp"
                android:layout_height="40dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintHorizontal_bias="0.96"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintVertical_bias="0.05"
                app:srcCompat="@android:drawable/ic_menu_delete" />

        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.cardview.widget.CardView>
</LinearLayout>

这就是我想要的：

enter image description here

这就是我得到的：

enter image description here

我不知道为什么。有人可以帮我吗？

此外，如果需要，这是我在调用回收器视图的位置：

 <?xml version="1.0" encoding="utf-8"?>

        <FrameLayout xmlns:android="http://schemas.android

.com/apk/res/android"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".drawernav.bottom_navi.recycler_view.sgpa_frag">

        <!-- TODO: Update blank fragment layout -->
        <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rc1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content">

        </androidx.recyclerview.widget.RecyclerView>

        <TextView
            android:id="@+id/else2"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:text="It's a bit lonely here..."
            android:gravity="center"
            android:visibility="gone"/>

    </FrameLayout>
android-layout android-recyclerview android-linearlayout android-constraintlayout android-cardview
1个回答
0
投票

尝试使用此布局：

   <androidx.constraintlayout.widget.ConstraintLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:layout_editor_absoluteX="0dp"
    tools:layout_editor_absoluteY="0dp">

    <androidx.constraintlayout.widget.Guideline
        android:id="@+id/guideline"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        app:layout_constraintGuide_percent="0.2" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="1"
        android:textSize="20sp"
        android:textStyle="bold"

        app:layout_constraintBottom_toBottomOf="@+id/btndelete1"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.2"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@+id/btndelete1"
        app:layout_constraintVertical_bias="0.3" />

    <TextView
        android:id="@+id/semester"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="2"
        app:layout_constraintBottom_toBottomOf="@+id/textView2"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.15"
        app:layout_constraintStart_toEndOf="@+id/textView2"
        app:layout_constraintTop_toTopOf="@+id/textView2"
        app:layout_constraintVertical_bias="0.3"
        app:layout_constraintWidth_percent="0.1" />

    <TextView
        android:id="@+id/textView32"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="SGPA"
        app:layout_constraintBottom_toTopOf="@+id/guideline"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="@+id/textView2"
        app:layout_constraintHorizontal_bias="0.2"
        app:layout_constraintStart_toStartOf="@+id/textView2"
        app:layout_constraintTop_toBottomOf="@+id/textView2"
        app:layout_constraintVertical_bias="0.7"
        app:layout_constraintWidth_percent="0.1" />

    <TextView
        android:id="@+id/textView33"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:text="Percentage"
        app:layout_constraintBottom_toBottomOf="@+id/textView32"
        app:layout_constraintEnd_toStartOf="@+id/btndelete1"
        app:layout_constraintHorizontal_bias="0.6"
        app:layout_constraintStart_toEndOf="@+id/semester"
        app:layout_constraintTop_toTopOf="@+id/textView32"
        app:layout_constraintVertical_bias="0.70"
        app:layout_constraintWidth_percent="0.18" />

    <TextView
        android:id="@+id/textV"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="3"
        app:layout_constraintBottom_toBottomOf="@+id/textView32"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="@+id/semester"
        app:layout_constraintHorizontal_bias="0.08"
        app:layout_constraintStart_toStartOf="@+id/semester"
        app:layout_constraintTop_toTopOf="@+id/textView32"
        app:layout_constraintVertical_bias="0.0"
        app:layout_constraintWidth_percent="0.1" />

    <TextView
        android:id="@+id/textVw"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="5"
        app:layout_constraintBottom_toBottomOf="@+id/textView33"
        app:layout_constraintEnd_toStartOf="@+id/btndelete1"
        app:layout_constraintHorizontal_bias="0.08"
        app:layout_constraintStart_toEndOf="@+id/textView33"
        app:layout_constraintTop_toTopOf="@+id/textView33" />

    <TextView
        android:id="@+id/scheme1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="4"
        android:textSize="10sp"
        app:layout_constraintEnd_toEndOf="@+id/btndelete1"
        app:layout_constraintStart_toStartOf="@+id/btndelete1"
        app:layout_constraintTop_toTopOf="@+id/guideline" />

    <ImageButton
        android:id="@+id/btndelete1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintDimensionRatio="1:1"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.96"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintVertical_bias="0.05"
        app:layout_constraintWidth_percent="0.1"
        app:srcCompat="@android:drawable/ic_menu_delete" />

</androidx.constraintlayout.widget.ConstraintLayout>

我已使用这些属性使您的布局具有响应性：

app:layout_constraintGuide_percent="0.2" 
app:layout_constraintDimensionRatio="1:1"

此外，我添加了Guideline

它将看起来像这样：

enter image description here

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