How to add items to a spinner in Android?

How to add items to a spinner?

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XML 文件:

<Spinner
android:id="@+id/Spinner01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"/>

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);
}
}

参见 spinner 示例 。

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对于在 Spinner 中添加条目，您可以做一件事情，尝试创建一个适配器，然后在适配器中添加/删除条目，然后您可以通过使用 setAdapter()方法轻松地将该适配器绑定到 Spinner。

Here is an example:

spinner.setAdapter(adapter);
adapter.add(item1);
adapter.add(item2);
adapter.add(item3);
adapter.add(item4);
adapter.add(item5);
adapter.notifyDataSetChanged();
spinner.setAdapter(adapter);
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Try this code:

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
}
});

还可以通过 String 数组 xml 文件添加 spinner 条目值。

<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>

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
}
});
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我找到了另一个选项: 布局文件中的 spinner 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:

<resources>
<string-array name="spinnerItems">
<item>item1</item>
<item>item2</item>
<item>item3</item>
<item>item4</item>
</string-array>
</resources>

Link to the full source of the code

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这段代码主要读取一个 JSON 数组对象，并将每一行转换为 spinner 中作为参数传递的一个选项:

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;
}
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向 XML 布局添加一个微调器，然后将下面的代码添加到 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);
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更新列表后添加此代码

假设:

The ArrayAdapter<String> variable name is DataAdapter 数据适配器, List 变量名称为 钥匙。

  • AddAll (关键字) ;
  • NotifyDataSetChanged () ;
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它只是清除适配器，添加所有的项目，并通知更改，如下所示:

  public void show(List<Object> objLIst) {
adapter.clear();
adapter.addAll(objLIst);
adapter.notifyDataSetChanged(); }
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<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:

<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:drawSelectorOnTop="true"
android:entries="@array/array_name"
/>
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An easier way is to use the material spinner library: https://github.com/jaredrummler/MaterialSpinner

首先添加到您的项目:

compile 'com.jaredrummler:material-spinner:1.2.4'

像这样使用:

<com.jaredrummler.materialspinner.MaterialSpinner
android:id="@+id/spinner"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>

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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要将 还有一样东西加入到 Spinner，你可以:

ArrayAdapter myAdapter =
((ArrayAdapter) mySpinner.getAdapter());


myAdapter.add(myValue);


myAdapter.notifyDataSetChanged();

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