TextView没有显示在布局中

Question

我在XML中使用TextView有问题。 这是我的XML代码：

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:fitsSystemWindows="true"
    tools:context=".frontScreen">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:orientation="horizontal"
        android:padding="@dimen/activity_horizontal_margin">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/plan"
            android:shadowColor="@color/colorPrimary"
            android:textColor="@color/colorPrimary"
            android:textSize="30sp"
            android:shadowRadius="2"
            android:gravity="center_horizontal"

            android:shadowDx="1"
            android:shadowDy="1"
           />
    </RelativeLayout>

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:orientation="horizontal"
        android:padding="@dimen/activity_horizontal_margin">

        <Button
            android:id="@+id/plan1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />

        <Button
            android:id="@+id/plan2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />


</LinearLayout>
</android.support.design.widget.CoordinatorLayout>

如果我写TextView是线性布局。 然后与按钮重叠。 所以我使用2个相对和线性布局。 当我在设计中单击TextView时，看起来TextView具有我想要的确切空间，但是Text消失了

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:fitsSystemWindows="true"
    tools:context=".frontScreen">




    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:orientation="horizontal"
        android:padding="@dimen/activity_horizontal_margin">

        <Button
            android:id="@+id/plan1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />

        <Button
            android:id="@+id/plan2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />


    </LinearLayout>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:orientation="horizontal"
        android:padding="@dimen/activity_horizontal_margin">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="plan"
            android:shadowColor="@color/colorPrimary"
            android:textColor="@color/colorPrimary"
            android:textSize="30sp"
            android:shadowRadius="2"
            android:gravity="center_horizontal"

            android:shadowDx="1"
            android:shadowDy="1"
            />
    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>

希望这可以帮助。 但是为了更好地工作，您需要在单一布局中采用相对布局和线性布局。 随时问这是否行不通

编辑：

如果您需要一个视图，可以尝试

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    android:fitsSystemWindows="true">


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:background="@color/colorAccent"
        android:orientation="horizontal"
        android:padding="@dimen/activity_horizontal_margin">
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="plan"
            android:shadowColor="@color/colorPrimary"
            android:textColor="@color/colorPrimary"
            android:textSize="30sp"
            android:shadowRadius="2"
            android:layout_alignParentTop="true"
            android:gravity="center_horizontal"
            android:shadowDx="1"
            android:shadowDy="1" />
    <LinearLayout
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@color/colorAccent"
        android:gravity="center"
        android:orientation="horizontal"
        android:layout_centerInParent="true"
        android:padding="@dimen/activity_horizontal_margin">

        <Button
            android:id="@+id/plan1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />

        <Button
            android:id="@+id/plan2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            tools:ignore="ButtonStyle" />

    </LinearLayout>

    </RelativeLayout>
</android.support.design.widget.CoordinatorLayout>