android - 当我在 android 中点击它时，如何在 Button 下方显示 SpinnerList

Question

嗨，我是 Android 的新手，我在我的应用程序中创建了一个按钮和一个 TextView

当我们点击我的按钮时，我想显示微调列表，当我们选择任何一行时，我想在我的 TextView 中显示该数据

为此，我写了下面的代码，但是当我们点击按钮时，微调器不会显示在按钮下方

它显示如下图，我想显示按钮下方的列表，请帮助我

xml:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    <LinearLayout
        android:id="@+id/mainlayout"
        android:layout_marginLeft="10dp"
        android:layout_marginRight="10dp"
        android:paddingTop="15dp"
        android:paddingBottom="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_vertical"
        android:orientation="horizontal">

        <TextView
            android:textSize="20dp"
            android:id="@+id/title"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="50dp"
            android:layout_gravity="center_vertical"
            android:gravity="center"
            android:text="title" />

        <Button
            android:id="@+id/imageViewplaces"
            android:layout_width="100dp"
            android:layout_height="50dp"
            android:layout_gravity="center_vertical"
            android:layout_marginLeft="20dp"
            android:text="OK"
            android:onClick="ClickButton" />

    </LinearLayout>

    <Spinner
        android:layout_below ="@+id/mainlayout"
        android:layout_marginRight="10dp"
        android:id="@+id/spinner"
        android:layout_width="100dp"
        android:layout_height="wrap_content"
        android:prompt="@string/spinner_title" />

</LinearLayout>

Activity 类:-

public class SpinnerList extends AppCompatActivity {

    String [] spinnerList = {"first","second","third"
    };
    Spinner spinner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.spinner_layout);

        spinner = (Spinner)findViewById(R.id.spinner);
        // Creating adapter for spinner
        ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, spinnerList);
        // Drop down layout style - list view with radio button
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        // attaching data adapter to spinner
        spinner.setAdapter(dataAdapter);
        spinner.setVisibility(spinner.GONE);
    }

    public void ClickButton(View view){

        spinner.performClick();
    }

Answer 1

给你:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">

<LinearLayout
    android:id="@+id/mainlayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_vertical"
    android:layout_marginLeft="10dp"
    android:layout_marginRight="10dp"
    android:layout_toLeftOf="@id/imageViewplaces"
    android:orientation="horizontal"
    android:paddingBottom="15dp"
    android:paddingTop="15dp">

    <TextView
        android:id="@+id/title"
        android:layout_width="0dp"
        android:layout_height="50dp"
        android:layout_gravity="center_vertical"
        android:layout_weight="1"
        android:gravity="center"
        android:text="title"
        android:textSize="20dp" />

</LinearLayout>


<Button
    android:id="@+id/imageViewplaces"
    android:layout_width="100dp"
    android:layout_height="50dp"
    android:layout_alignParentRight="true"
    android:layout_marginTop="15dp"
    android:layout_marginRight="15dp"
    android:onClick="ClickButton"
    android:text="OK" />

<Spinner
    android:id="@+id/spinner"
    android:layout_width="100dp"
    android:layout_height="wrap_content"
    android:layout_below="@+id/imageViewplaces"
    android:layout_alignParentRight="true"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
     />
</RelativeLayout>