如何创建下拉列表?我试过ScrollView,但它不是我所需要的。
当前回答
创建Spinner inm XML android:条目= " @array /位置” 然后悬停在数组/位置上并创建资源文件
资源文件应该是这样的 ` “新约克郡”
</resources>`
Then
binding.spinner.selectedItem.toString()
其他回答
创建Spinner inm XML android:条目= " @array /位置” 然后悬停在数组/位置上并创建资源文件
资源文件应该是这样的 ` “新约克郡”
</resources>`
Then
binding.spinner.selectedItem.toString()
下面是它的代码。
activity_main.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Spinner
android:id="@+id/static_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="20dp"
android:layout_marginTop="20dp" />
<Spinner
android:id="@+id/dynamic_spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
strings.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="app_name">Ahotbrew.com - Dropdown</string>
<string-array name="brew_array">
<item>Cappuccino</item>
<item>Espresso</item>
<item>Mocha</item>
<item>Caffè Americano</item>
<item>Cafe Zorro</item>
</string-array>
MainActivity
Spinner staticSpinner = (Spinner) findViewById(R.id.static_spinner);
// Create an ArrayAdapter using the string array and a default spinner
ArrayAdapter<CharSequence> staticAdapter = ArrayAdapter
.createFromResource(this, R.array.brew_array,
android.R.layout.simple_spinner_item);
// Specify the layout to use when the list of choices appears
staticAdapter
.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// Apply the adapter to the spinner
staticSpinner.setAdapter(staticAdapter);
Spinner dynamicSpinner = (Spinner) findViewById(R.id.dynamic_spinner);
String[] items = new String[] { "Chai Latte", "Green Tea", "Black Tea" };
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, items);
dynamicSpinner.setAdapter(adapter);
dynamicSpinner.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
Log.v("item", (String) parent.getItemAtPosition(position));
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
});
这个例子来自 http://www.ahotbrew.com/android-dropdown-spinner-example/
试试这个…
<string-array name="names">
<item></item>
<item>By Bus</item>
<item>By Train</item>
<item>By Van</item>
<item>By Bike</item>
</string-array>
String travel_type;
ArrayAdapter<String> myAdapter = new ArrayAdapter(AddNew_Trip.this,android.R.layout.simple_list_item_1, getResources().getStringArray(R.array.names));
myAdapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
mySpinner.setAdapter(myAdapter);
mySpinner.setOnItemSelectedListener(
new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
travel_type = String.valueOf(adapterView.getItemAtPosition(i));
//Toast.makeText(Plan_Trip.this, travel_type, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
);
}
parseInt(binding.inputAge.text.toString()),
新的android资源文件(dropdown_item)在R.layout。Dropdown_item,把textview放在里面。
TextView代码:
`<TextView android:id="@+id/textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="14sp"
android:text="textView"
android:textColor="@color/black"
android:textSize="16sp"
android:textStyle="bold"
xmlns:android="http://schemas.android.com/apk/res/android"/>`
//绑定适配器并获取值 binding.ddCity.setAdapter (showCity) binding.ddCity.selectedItem.toString ()
要将你的列表动态添加到旋转器中,就像从webservice中添加数组列表中的项目,并将其加载到旋转器中
<androidx.appcompat.widget.AppCompatSpinner
android:id="@+id/catNameSpinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:spinnerMode="dropdown"
/>
spinner = findViewById(R.id.catNameSpinner);
ArrayList<String> cat = new ArrayList<>();
cat.add("Choose");
ArrayAdapter<String> spinnerAdapter = new ArrayAdapter<String>
(this,android.R.layout.simple_dropdown_item_1line,cat);
spinner.setAdapter(spinnerAdapter);
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