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
你也可以使用AppCompatSpinner小部件:
<android.support.v7.widget.AppCompatSpinner
android:id="@+id/spinner_order_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="@color/red"/>
在Activity类内部:
AppCompatSpinner spinOrderType = (AppCompatSpinner) findViewById(R.id.spinner_order_type);
List<String> categories = new ArrayList<String>();
categories.add(getString(R.string.label_table_order));
categories.add(getString(R.string.label_take_away));
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(mContext,
R.layout.layout_spinner_item, categories);
dataAdapter.setDropDownViewResource(R.layout.layout_spinner_item);
spinOrderType.setAdapter(dataAdapter);
spinOrderType.setSelection(0);
spinOrderType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long l) {
String item = parent.getItemAtPosition(position).toString();
Log.d(TAG, item);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
layout_spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:tools="http://schemas.android.com/tools"
android:gravity="left"
android:textSize="@dimen/text.size.large"
android:textColor="@color/text.link"
android:padding="@dimen/margin.3" />
其他回答
在Kotlin中,您可以这样做:
首先,将这些代码放入布局中
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="match_parent"/>
然后你可以在onCreate()在活动作为->
val spinner = findViewById<Spinner>(R.id.spinner)
val items = arrayOf("500g", "1kg", "2kg")
val adapter = ArrayAdapter<String>(
this,
android.R.layout.simple_spinner_dropdown_item,
items
)
spinner.setAdapter(adapter)
你可以从下拉菜单中获取listener:
spinner.onItemSelectedListener = object : OnItemSelectedListener {
override fun onItemSelected(
arg0: AdapterView<*>?,
arg1: View?,
arg2: Int,
arg3: Long
) {
// Do what you want
val items = spinner.selectedItem.toString()
}
override fun onNothingSelected(arg0: AdapterView<*>?) {}
}
你也可以使用AppCompatSpinner小部件:
<android.support.v7.widget.AppCompatSpinner
android:id="@+id/spinner_order_type"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="@color/red"/>
在Activity类内部:
AppCompatSpinner spinOrderType = (AppCompatSpinner) findViewById(R.id.spinner_order_type);
List<String> categories = new ArrayList<String>();
categories.add(getString(R.string.label_table_order));
categories.add(getString(R.string.label_take_away));
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(mContext,
R.layout.layout_spinner_item, categories);
dataAdapter.setDropDownViewResource(R.layout.layout_spinner_item);
spinOrderType.setAdapter(dataAdapter);
spinOrderType.setSelection(0);
spinOrderType.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long l) {
String item = parent.getItemAtPosition(position).toString();
Log.d(TAG, item);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
layout_spinner_item.xml
<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:tools="http://schemas.android.com/tools"
android:gravity="left"
android:textSize="@dimen/text.size.large"
android:textColor="@color/text.link"
android:padding="@dimen/margin.3" />
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()
你需要一个旋转器。下面是一个例子:
spinner_1 = (Spinner) findViewById(R.id.spinner1);
spinner_1.setOnItemSelectedListener(this);
List<String> list = new ArrayList<String>();
list.add("RANJITH");
list.add("ARUN");
list.add("JEESMON");
list.add("NISAM");
list.add("SREEJITH");
list.add("SANJAY");
list.add("AKSHY");
list.add("FIROZ");
list.add("RAHUL");
list.add("ARJUN");
list.add("SAVIYO");
list.add("VISHNU");
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, list);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner_1.setAdapter(adapter);
spinner_2 = (Spinner) findViewById(R.id.spinner_two);
spinner_2.setOnItemSelectedListener(this);
List<String> city = new ArrayList<String>();
city.add("KASARGOD");
city.add("KANNUR");
city.add("THRISSUR");
city.add("KOZHIKODE");
city.add("TRIVANDRUM");
city.add("ERNAMKULLAM");
city.add("WAYANAD");
city.add("PALAKKAD");
city.add("ALAPUZHA");
city.add("IDUKKI");
city.add("KOTTAYAM");
city.add("PATHANAMTHITTA");
city.add("KOLLAM");
city.add("MALAPPURAM");
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, city);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner_2.setAdapter(adapter2);
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position,
long id) {
// TODO Auto-generated method stub
Toast.makeText(this, "YOUR SELECTION IS : " + parent.getItemAtPosition(position).toString(), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
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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