[英]How to add items to a spinner in Android?
如何将项目添加到微调器?
XML file: XML 文件:
<Spinner
android:id="@+id/Spinner01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>
Java file: Java 文件:
public class SpinnerExample extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
String[] arraySpinner = new String[] {
"1", "2", "3", "4", "5", "6", "7"
};
Spinner s = (Spinner) findViewById(R.id.Spinner01);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, arraySpinner);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
s.setAdapter(adapter);
}
}
I've found another option: spinner definition in the layout file我找到了另一个选项:布局文件中的微调器定义
<Spinner android:id="@+id/spinner"
android:layout_width="fill_parent"
android:drawSelectorOnTop="true"
android:prompt="@string/spin"
android:entries="@array/spinnerItems"
/>
Items definition in the file array.xml:文件 array.xml 中的项目定义:
<resources>
<string-array name="spinnerItems">
<item>item1</item>
<item>item2</item>
<item>item3</item>
<item>item4</item>
</string-array>
</resources>
Try this code:试试这个代码:
final List<String> list = new ArrayList<String>();
list.add("Item 1");
list.add("Item 2");
list.add("Item 3");
list.add("Item 4");
list.add("Item 5");
final String[] str = {"Report 1", "Report 2", "Report 3", "Report 4", "Report 5"};
final Spinner sp1 = (Spinner) findViewById(R.id.spinner1);
final Spinner sp2 = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> adp1 = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1, list);
adp1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp1.setAdapter(adp1);
ArrayAdapter<String> adp2 = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item, str);
adp2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp2.setAdapter(adp2);
sp1.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), list.get(position), Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
sp2.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
Toast.makeText(getBaseContext(), str[position], Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
You can also add spinner item value through String array xml file..您还可以通过字符串数组 xml 文件添加微调器项目值。
<resources>
<string name="app_name">Spinner_ex5</string>
<string name="hello_world">Hello world!</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_main">MainActivity</string>
<string-array name="str2">
<item>Data 1</item>
<item>Data 2</item>
<item>Data 3</item>
<item>Data 4</item>
<item>Data 5</item>
</string-array>
</resources>
In mainActivity.java:在 mainActivity.java 中:
final Spinner sp3 = (Spinner) findViewById(R.id.spinner3);
ArrayAdapter<CharSequence> adp3 = ArrayAdapter.createFromResource(this,
R.array.str2, android.R.layout.simple_list_item_1);
adp3.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
sp3.setAdapter(adp3);
sp3.setOnItemSelectedListener(new OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1, int position, long id) {
// TODO Auto-generated method stub
String ss = sp3.getSelectedItem().toString();
Toast.makeText(getBaseContext(), ss, Toast.LENGTH_SHORT).show();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
<string-array name="array_name">
<item>Array Item One</item>
<item>Array Item Two</item>
<item>Array Item Three</item>
</string-array>
In your layout:在您的布局中:
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop="true"
android:entries="@array/array_name"
/>
For adding item in Spinner, you can do one thing, try to create an adapter and then add/remove items into the adapter, then you can easily bind that adapter to spinner by using setAdapter()
method.要在 Spinner 中添加项目,您可以做一件事,尝试创建一个适配器,然后在适配器中添加/删除项目,然后您可以使用
setAdapter()
方法轻松将该适配器绑定到微调器。
Here is an example:这是一个例子:
spinner.setAdapter(adapter);
adapter.add(item1);
adapter.add(item2);
adapter.add(item3);
adapter.add(item4);
adapter.add(item5);
adapter.notifyDataSetChanged();
spinner.setAdapter(adapter);
This code basically reads a JSON array object and convert each row into an option in the spinner that is passed as a parameter:此代码基本上读取 JSON 数组对象并将每一行转换为作为参数传递的微调器中的选项:
public ArrayAdapter<String> getArrayAdapterFromArrayListForSpinner(ArrayList<JSONObject> aArrayList, String aField)
{
ArrayAdapter<String> aArrayAdapter = new ArrayAdapter<String>(context, android.R.layout.simple_spinner_item);
aArrayAdapter.setDropDownViewResource(R.layout.multiline_spinner_dropdown_item); //android.R.layout.simple_spinner_dropdown_item
try {
for (int i = 0; i < aArrayList.size(); i++)
{
aArrayAdapter.add(aArrayList.get(i).getString(aField));
}
} catch (JSONException e) {
e.printStackTrace();
ShowMessage("Error while reading the JSON list");
}
return aArrayAdapter;
}
Add a spinner to the XML layout, and then add this code to the Java file:将微调器添加到 XML 布局,然后将此代码添加到 Java 文件:
Spinner spinner;
spinner = (Spinner) findViewById(R.id.spinner1) ;
java.util.ArrayList<String> strings = new java.util.ArrayList<>();
strings.add("Mobile") ;
strings.add("Home");
strings.add("Work");
SpinnerAdapter spinnerAdapter = new SpinnerAdapter(AddMember.this, R.layout.support_simple_spinner_dropdown_item, strings);
spinner.setAdapter(spinnerAdapter);
Add this code after updating the list更新列表后添加此代码
Suppose:认为:
The ArrayAdapter<String> variable name is dataAdapter , and the List variable name is keys . ArrayAdapter<String> 变量名是dataAdapter ,而 List 变量名是keys 。
To add one more item to Spinner you can:要向Spinner添加更多项目,您可以:
ArrayAdapter myAdapter =
((ArrayAdapter) mySpinner.getAdapter());
myAdapter.add(myValue);
myAdapter.notifyDataSetChanged();
It's just to clear the adapter, add all itens and notify change like below:这只是为了清除适配器,添加所有项目并通知更改,如下所示:
public void show(List<Object> objLIst) {
adapter.clear();
adapter.addAll(objLIst);
adapter.notifyDataSetChanged(); }
An easier way is to use the material spinner library: https://github.com/jaredrummler/MaterialSpinner更简单的方法是使用材质微调器库: https ://github.com/jaredrummler/MaterialSpinner
first add to your project:首先添加到您的项目中:
compile 'com.jaredrummler:material-spinner:1.2.4'
and use like this:并像这样使用:
<com.jaredrummler.materialspinner.MaterialSpinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
and java code that you can add items in java so easy:和java代码,你可以很容易地在java中添加项目:
MaterialSpinner spinner = (MaterialSpinner) findViewById(R.id.spinner);
spinner.setItems("item 1", "item 2", "item 3", "item 4", "item 5");
spinner.setOnItemSelectedListener(new MaterialSpinner.OnItemSelectedListener<String>() {
@Override public void onItemSelected(MaterialSpinner view, int position, long id, String item) {
Snackbar.make(view, "Clicked " + item, Snackbar.LENGTH_LONG).show();
}
});
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