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
试试这个:
package example.spin.spinnerexample;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
String[] bankNames={"BOI","SBI","HDFC","PNB","OBC"};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Getting the instance of Spinner and applying OnItemSelectedListener on it
Spinner spin = (Spinner) findViewById(R.id.simpleSpinner);
spin.setOnItemSelectedListener(this);
//Creating the ArrayAdapter instance having the bank name list
ArrayAdapter aa = new ArrayAdapter(this,android.R.layout.simple_spinner_item,bankNames);
aa.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
//Setting the ArrayAdapter data on the Spinner
spin.setAdapter(aa);
}
//Performing action onItemSelected and onNothing selected
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position,long id) {
Toast.makeText(getApplicationContext(), bankNames[position], Toast.LENGTH_LONG).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
}
activity_main.xml: -
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity">
<Spinner
android:id="@+id/simpleSpinner"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp" />
</RelativeLayout>
您可以通过以下简单的步骤创建旋转器
首先在XML中创建旋转器
<Spinner
android:id="@+id/select"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textColor="#070707"></Spinner>
现在在值中创建字符串arary
<string-array name="itemselect">
<item>Repurchase</item>
<item>Coupons</item>
</string-array>
现在在Java文件中初始化
public class MemberCart_Activity extends AppCompatActivity {
Spinner select;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_member_cart);
select=findViewById(R.id.select);
ArrayAdapter<String> myadapter=new ArrayAdapter<String>(Main_Activity.this,android.R.layout.simple_list_item_1,getResources().getStringArray(R.array.itemselect));
myadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
select.setAdapter(myadapter);
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 ()
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/
转轮xml:
<Spinner
android:id="@+id/spinner"
android:layout_width="wrap_content"
android:layout_height="match_parent" />
java:
public class MainActivity extends AppCompatActivity implements AdapterView.OnItemSelectedListener{
private Spinner spinner;
private static final String[] paths = {"item 1", "item 2", "item 3"};
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.main_layout);
spinner = (Spinner)findViewById(R.id.spinner);
ArrayAdapter<String>adapter = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,paths);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
spinner.setOnItemSelectedListener(this);
}
@Override
public void onItemSelected(AdapterView<?> parent, View v, int position, long id) {
switch (position) {
case 0:
// Whatever you want to happen when the first item gets selected
break;
case 1:
// Whatever you want to happen when the second item gets selected
break;
case 2:
// Whatever you want to happen when the thrid item gets selected
break;
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
// TODO Auto-generated method stub
}
}
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