Android 如何更改微调器'；下拉宽度是多少？

---

main.xml

<LinearLayout
    android:id="@+id/spinners"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:orientation="horizontal">
    <Spinner
        android:id="@+id/location_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
    <Spinner
        android:id="@+id/license_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <Button
        android:id="@+id/btn_1"
        style="@style/SpinnerButton">
    </Button>

</LinearLayout>

<style name="SpinnerButton" parent="@android:style/Widget.Button">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_marginLeft">5dp</item>
    <item name="android:layout_marginRight">5dp</item>
    <item name="android:layout_marginBottom">10dp</item>
    <item name="android:textColor">@android:color/black</item>
    <item name="android:layout_weight">1</item>
    <item name="android:clickable">true</item>
</style>

---

spinner\u row.xml

<LinearLayout
    android:id="@+id/spinners"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:orientation="horizontal">
    <Spinner
        android:id="@+id/location_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
    <Spinner
        android:id="@+id/license_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <Button
        android:id="@+id/btn_1"
        style="@style/SpinnerButton">
    </Button>

</LinearLayout>

<style name="SpinnerButton" parent="@android:style/Widget.Button">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_marginLeft">5dp</item>
    <item name="android:layout_marginRight">5dp</item>
    <item name="android:layout_marginBottom">10dp</item>
    <item name="android:textColor">@android:color/black</item>
    <item name="android:layout_weight">1</item>
    <item name="android:clickable">true</item>
</style>

---

style.xml

<LinearLayout
    android:id="@+id/spinners"
    android:layout_width="match_parent"
    android:layout_height="40dp"
    android:orientation="horizontal">
    <Spinner
        android:id="@+id/location_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
    <Spinner
        android:id="@+id/license_spinner"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:dropDownWidth="match_parent"/>
</LinearLayout>

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center_vertical"
    android:orientation="horizontal">

    <Button
        android:id="@+id/btn_1"
        style="@style/SpinnerButton">
    </Button>

</LinearLayout>

<style name="SpinnerButton" parent="@android:style/Widget.Button">
    <item name="android:layout_width">match_parent</item>
    <item name="android:layout_height">wrap_content</item>
    <item name="android:layout_marginLeft">5dp</item>
    <item name="android:layout_marginRight">5dp</item>
    <item name="android:layout_marginBottom">10dp</item>
    <item name="android:textColor">@android:color/black</item>
    <item name="android:layout_weight">1</item>
    <item name="android:clickable">true</item>
</style>

匹配父项
包装内容
5dp
5dp
10dp
@android：彩色/黑色
1.
真的

---

我想要像[picture B]这样的下拉式样式。我使用了

dropDownWidth=match\u parent

。但它不起作用。我想是因为这个下拉列表的父对象是Spinner。每个微调器的重量为1。是否有方法应用宽下拉布局？

如果适用，请尝试以下代码

 DealCategorySpinner = (Spinner) findViewById(R.id.DealCategorySpinner);

    try {
        Field popup = Spinner.class.getDeclaredField("mPopup");
        popup.setAccessible(true);

        // Get private mPopup member variable and try cast to ListPopupWindow
        android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(DealCategorySpinner);

        // Set popupWindow width to 800px
        popupWindow.setWidth(800);
    }
    catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
        e.printStackTrace();
    }

---

如果对您有效，请尝试以下代码

 DealCategorySpinner = (Spinner) findViewById(R.id.DealCategorySpinner);

    try {
        Field popup = Spinner.class.getDeclaredField("mPopup");
        popup.setAccessible(true);

        // Get private mPopup member variable and try cast to ListPopupWindow
        android.widget.ListPopupWindow popupWindow = (android.widget.ListPopupWindow) popup.get(DealCategorySpinner);

        // Set popupWindow width to 800px
        popupWindow.setWidth(800);
    }
    catch (NoClassDefFoundError | ClassCastException | NoSuchFieldException | IllegalAccessException e) {
        e.printStackTrace();
    }

---

尝试使用弹出式菜单而不是微调器，请查看此链接@Sachin Shelar>>谢谢您的评论。我认为你和@Android Dev推荐同样的方法。对吗？可能重复尝试弹出菜单而不是微调器，请检查此链接@Sachin Shelar>>谢谢您的评论。我认为你和@Android Dev推荐同样的方法。对吧？可能是重复的