当我使用自定义视图时，它显示为空白

问题描述 投票：0回答：1

我想制作一个带边框的网格，所以我创建了一个空单元格视图，它是较大的黑色视图之上的较小的白色视图，因此它看起来像是一个带有黑色边框的白色单元格，但是当我将其放入网格中时，它什么也没有显示，即使我指定宽度和高度它仍然不显示任何内容

空_cell.xml：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    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="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="center"
    tools:ignore="MissingDefaultResource">


    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:foregroundGravity="center"
        android:background="#bbb">

        <View
            android:id="@+id/frame"
            android:layout_width="100sp"
            android:layout_height="25sp"
            android:background="@color/black"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <View
            android:layout_width="96sp"
            android:layout_height="21sp"
            android:background="@color/white"
            app:layout_constraintBottom_toBottomOf="@+id/frame"
            app:layout_constraintEnd_toEndOf="@+id/frame"
            app:layout_constraintStart_toStartOf="@+id/frame"
            app:layout_constraintTop_toTopOf="@+id/frame" />




    </androidx.constraintlayout.widget.ConstraintLayout>

</RelativeLayout>

EmptyCell.java：

package com.example.teacherplanner;

import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.RelativeLayout;

import androidx.annotation.Nullable;

public class EmptyCell extends RelativeLayout {
    public EmptyCell(Context context) {
        super(context);
        init(context);
    }

    public EmptyCell(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init(context);
    }


    private void init(Context context) {
        LayoutInflater inflater = LayoutInflater.from(context);
        inflater.inflate(R.layout.empty_cell, this, true);
    }
}

我想在其中使用自定义视图的 XML 文件：

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
    tools:context=".WeekEditing"
    >

    <GridLayout
        android:id="@+id/LOOK_AT_WEEK_HERE"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintHeight_percent="0.7"
        android:gravity="center"
        tools:ignore="MissingConstraints,SpeakableTextPresentCheck"
        android:orientation="horizontal">
<!--**************** CUSTOM VIEW *****************-->          
        <com.example.teacherplanner.EmptyCell
            android:layout_width="100sp"
            android:layout_height="25sp"/>
<!--**********************************************-->        


    </GridLayout>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/edit_button_window"
        android:layout_width="match_parent"
        android:layout_height="0sp"
        android:orientation="horizontal"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHeight_percent="0.3"
        app:layout_constraintStart_toStartOf="parent">

        <LinearLayout
            android:id="@+id/edit_subject_buttons"
            android:layout_width="match_parent"
            android:layout_height="40sp"
            app:layout_constraintTop_toTopOf="parent">

            <androidx.appcompat.widget.AppCompatButton
                android:id="@+id/EDIT_BUTTON"
                android:layout_width="0sp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@color/blue_button_on"
                android:textColor="@color/button_text_on"
                android:text="EDIT"
                android:textSize="25sp"
                tools:ignore="HardcodedText,TouchTargetSizeCheck,VisualLintButtonSize"
                />

            <androidx.appcompat.widget.AppCompatButton
                android:id="@+id/SUBJECT_BUTTON"
                android:layout_width="0sp"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:background="@color/blue_button_off"
                android:textColor="@color/button_text_off"
                android:text="SUBJECT"
                android:textSize="25sp"
                tools:ignore="HardcodedText,TouchTargetSizeCheck,VisualLintButtonSize" />

        </LinearLayout>

        <androidx.constraintlayout.widget.ConstraintLayout
            android:id="@+id/EDIT_WINDOW"
            android:layout_width="match_parent"
            android:layout_height="0sp"
            android:orientation="horizontal"
            android:background="@color/blue_button_on"
            android:visibility="visible"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintTop_toBottomOf="@+id/edit_subject_buttons">

            <androidx.appcompat.widget.AppCompatButton
                android:id="@+id/CLEAR_WEEK_BUTTON"
                android:layout_width="100sp"
                android:layout_height="match_parent"
                android:background="#f11"
                android:text="CLEAR WEEK"
                android:textSize="20sp"
                android:textStyle="bold"
                app:layout_constraintRight_toRightOf="parent"
                tools:ignore="HardcodedText" />
            <!-- FROM/TO SECTION -->
            <TextView
                android:id="@+id/from_date"
                android:layout_width="wrap_content"
                android:layout_height="30sp"
                android:layout_marginStart="16sp"
                android:layout_marginTop="16sp"
                android:gravity="center"
                android:text="From: "
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                tools:ignore="HardcodedText" />

            <androidx.cardview.widget.CardView
                android:id="@+id/from_card"
                android:layout_width="80sp"
                android:layout_height="30sp"
                android:background="#a54"
                app:layout_constraintLeft_toRightOf="@+id/from_date"
                app:layout_constraintTop_toTopOf="@+id/from_date" />

            <TextView
                android:id="@+id/to_date"
                android:layout_width="wrap_content"
                android:layout_height="30sp"
                android:layout_marginStart="16sp"
                android:gravity="center"
                android:text="To: "
                app:layout_constraintStart_toEndOf="@+id/from_card"
                app:layout_constraintTop_toTopOf="@+id/from_card"
                tools:ignore="HardcodedText" />

            <androidx.cardview.widget.CardView
                android:id="@+id/to_card"
                android:layout_width="80sp"
                android:layout_height="30sp"
                android:background="#a54"
                app:layout_constraintLeft_toRightOf="@+id/to_date"
                app:layout_constraintTop_toTopOf="@+id/to_date" />

            <!-- INTERVALS -->
            <TextView
                android:id="@+id/intervals"
                android:layout_width="wrap_content"
                android:layout_height="30sp"
                android:layout_marginStart="16sp"
                android:layout_marginTop="16sp"
                android:text="Intervals: "
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toBottomOf="@+id/from_date"
                tools:ignore="HardcodedText" />

            <androidx.cardview.widget.CardView
                android:layout_width="100sp"
                android:layout_height="30sp"
                app:layout_constraintStart_toEndOf="@+id/intervals"
                app:layout_constraintTop_toTopOf="@+id/intervals" />

        </androidx.constraintlayout.widget.ConstraintLayout>

        <ScrollView
            android:id="@+id/SUBJECT_WINDOW"
            android:layout_width="match_parent"
            android:layout_height="0sp"
            android:orientation="horizontal"
            android:visibility="invisible"
            android:background="@color/blue_button_on"
            app:layout_constraintBottom_toBottomOf="parent"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toBottomOf="@id/edit_subject_buttons"
            tools:ignore="SpeakableTextPresentCheck">

            <GridLayout
                android:id="@+id/SUBJECT_GRID"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:columnCount="3"
                android:gravity="center"
                android:padding="10sp"
                >
                <ImageButton
                    android:id="@+id/add_subject_btn"
                    android:layout_width="50sp"
                    android:layout_height="50sp"
                    android:layout_margin="10sp"
                    android:backgroundTint="#00FFFFFF"
                    android:src="@drawable/plus_circle"
                    app:layout_constraintDimensionRatio="1:1"
                    tools:ignore="SpeakableTextPresentCheck" />
            </GridLayout>


        </ScrollView>


    </androidx.constraintlayout.widget.ConstraintLayout>

</androidx.constraintlayout.widget.ConstraintLayout>

我尝试将其放入网格视图中，采用线性布局，但它仍然只显示一个空白空间

javascript android gridview android-custom-view
1个回答
0
投票

事实证明，即使我在运行模拟器后在设计布局上看不到它，它也能正常工作

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