这是函数，我试图使用微调器，从API获取数据，但问题是微调器下拉不显示。我是android.I的新手附加下面的代码。请建议我的解决方案。代码中没有任何错误。我打印数组我得到的数据。唯一的问题是下拉不显示。当我点击按钮响应获取。
@Override
public void onClick(View v)
{
String access=op.getUrl(getApplicationContext(),"ticket","update_properties","");
JSONArray access_denied = null;
try
{
access_denied = new editProperties(access).execute().get();
String access_result =access_denied.toString();
if(access_result.equals("[\"Accessdenied\"]"))
{
Operation.showToast(getApplicationContext(), R.string.access);
}
else
{
//Log.d("In the else Condition : ","Success");
String DEPT_URL=op.getUrl(getApplicationContext(),"ticket","get_department","&vis_all_department=1");
final String dept=tv_dept.getText().toString();
filter_dept_id=tv_dept_id.getText().toString();
if(v.getId()==R.id.td_tv_dept)
{
ArrayAdapter<String> dept_Adapter=op.get_dept_adapter(DEPT_URL,DEPARTMENT,Ticket_properties.this,domain_id);
final ArrayAdapter<String> dept_id_Adapter=op.get_dept_adapter(DEPT_URL,DEPARTMENT_ID,Ticket_properties.this,domain_id);
spin.setAdapter(dept_Adapter);
final int dept_Position = dept_Adapter.getPosition(dept);
spin.setSelection(dept_Position);//THIS ONE
spin.performClick();
spin.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view,
int pos, long id) {
// TODO Auto-generated method stub
String selected_item=parent.getItemAtPosition(pos).toString();
String selected_item_id=dept_id_Adapter.getItem(pos).toString();
String filter="&vis_ticket_id="+Ticket_id+"&vis_action=department&vis_update_id="+selected_item_id;
String UPDATE_DEPT_URL=op.getUrl(getApplicationContext(),"ticket","update_properties",filter);
JSONArray dept_array;
try
{
dept_array = new editProperties(UPDATE_DEPT_URL).execute().get();
String result =dept_array.toString();
if(result.equals("[\"success\"]"))
{
tv_dept.setText(selected_item);
tv_dept_id.setText(selected_item_id);
}
else {Operation.showToast(getApplicationContext(), R.string.error);}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
spin.setSelection(dept_Position);
}
});
}
else if
{
//NEXT CODE
}
// *********** ********
public ArrayAdapter<String> get_dept_adapter(String URL, String ITEM, Activity context,String domain_id)
{
// TODO Auto-generated method stub
JSONArray array ;
List<String> item_list = new ArrayList<String>();
try {
array=new adapter(URL+"&vis_encode=json",context).execute().get();
for (int i = 0; i <array.length(); i++)
{
JSONObject object;
try {
object = array.getJSONObject(i);
String new_domain_id=object.getString("domain_id");
if(domain_id.equals(new_domain_id))
{
String item=object.getString(ITEM);
item_list.add(item);
}
} catch (JSONException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ExecutionException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
ArrayAdapter<String> item_Adapter = new ArrayAdapter<String>(context, android.R.layout.simple_spinner_item,item_list);
item_Adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
return item_Adapter;
}
// *********** **************
Hello i just added the android:spinnerMode="dialog"
style="@android:style/Widget.Spinner.DropDown" these two lines and working fine.
Previous
==========
<Spinner
android:id="@+id/td_spin"
android:layout_width="0dp"
android:layout_height="0dp" />
After
=======
<Spinner
android:id="@+id/td_spin"
android:layout_width="0dp"
android:layout_height="0dp"
android:spinnerMode="dialog"
style="@android:style/Widget.Spinner.DropDown"
/>
答案 0 :(得分：1)
试试这段代码......
XML文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:padding="10dip"
android:layout_width="fill_parent"
android:layout_height="wrap_content">
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dip"
android:text="Category:"
android:layout_marginBottom="5dp"/>
<Spinner
android:id="@+id/spinner"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:prompt="@string/spinner_title"/>
</LinearLayout>
Java文件
// Spinner element
Spinner spinner = (Spinner) findViewById(R.id.spinner);
// Spinner Drop down List (in your case set data from api)
List<String> categories = new ArrayList<String>();
categories.add("Item 1");
categories.add("Item 2");
categories.add("Item 3");
categories.add("Item 4");
// Creating adapter for spinner
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, categories);
// Drop down layout style - list view with radio button
dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
// attaching data adapter to spinner
spinner.setAdapter(dataAdapter);
答案 1 :(得分：0)
在布局中添加
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:background="@drawable/spinner_border"
android:orientation="horizontal">
<Spinner
android:id="@+id/select_model"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:background="@android:color/transparent"
android:gravity="center"
android:layout_marginLeft="5dp"
android:spinnerMode="dropdown" />
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:src="@drawable/ic_arrow_drop_down_black_24dp" />
</RelativeLayout>
在您的drawable文件夹中创建spinner_border.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="@android:color/transparent" />
<corners android:radius="5dp" />
<stroke
android:width="1dp"
android:color="@android:color/darker_gray"/>
</shape>
在activity.java
中设置这样的微调器private void setUpSpinner(ArrayList<String> mModels){
modelSpinnerAdapter = new SelectionListAdapter(this, mModels);
dropdown.setAdapter(modelSpinnerAdapter);
dropdown.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
// model = parent.getSelectedItem().toString();
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
}
这是SelectionListAdapter.java
public class SelectionListAdapter extends BaseAdapter {
private Context context;
private List<String> listItemTitles;
public SelectionListAdapter(Context context, List<String> listItemTitles) {
this.context = context;
this.listItemTitles = listItemTitles;
}
@Override
public int getCount() {
return listItemTitles.size();
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public Object getItem(int position) {
return listItemTitles.get(position);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView == null) {
LayoutInflater layoutInflater = (LayoutInflater)this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = layoutInflater.inflate(R.layout.selector_row_item, parent, false);
}
TextView listItemTitleView = (TextView)convertView.findViewById(R.id.selector_item_texiView);
listItemTitleView.setText(listItemTitles.get(position).toUpperCase());
return convertView;
}
}
select_row_item.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android =
"http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="35dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="Title"
android:textColor="@color/md_black_1000"
android:textSize="14sp"
android:id="@+id/selector_item_texiView" />
</RelativeLayout>