android-如何使用/设置嵌套微调器? [英] android - how to use/set up nested spinners?
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问题描述
工作在片段中，我试图返回一个值，该值由在微调器中选择一个项目确定，但我无法使其正常工作.该方法内部的Toast通知甚至无法正常工作，看来问题出在方法内部.我该如何解决?
Working in fragments, I'm trying to return a value determined from selecting an item in a spinner and I can't make it work. The Toast notification inside the method isn't even working, it seems like the problem is within the method. How can I fix this?
public Spinner districtSpinner, countySpinner;
public int selectedDistrict;
是使用的变量.这是我父母的微调器方法，districtSpinner()
are the variables used. Here's my parent spinner method, districtSpinner()
public void districtSpinner() {
ArrayAdapter<String> Dadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.districtNames));
Dadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
districtSpinner.setAdapter(Dadapter);
districtSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
selectedDistrictPosition = districtSpinner.getSelectedItemPosition();
switch (selectedDistrictPosition) {
case 0: {
selectedDistrict = 1;
break;
}
case 1: {
selectedDistrict=2;
break;
}
case 2: {
selectedDistrict=3;
break;
}
case 3: {
selectedDistrict=4;
break;
}
case 4: {
selectedDistrict=5;
break;
}
case 5: {
selectedDistrict=6;
break;
}
case 6: {
selectedDistrict=8;
break;
}
case 7: {
selectedDistrict=9;
break;
}
case 8: {
selectedDistrict=10;
break;
}
case 9: {
selectedDistrict=11;
break;
}
case 10: {
selectedDistrict=12;
break;
}
default: {
selectedDistrict=1;
break;
}
}
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
}
这是我要使其依赖于父微调器的子微调器"countySpinner".该方法应基于selectedDistrict进行切换，并使用包含每个区的县集(R.array.districtx)的相应字符串数组设置微调器.目前，第二个微调器什么也不做，就我所担心的，甚至没有调用countySpinner().
this is the child spinner "countySpinner" that I am trying to make dependent on the parent spinner. The method should switch based on the selectedDistrict and set up the spinner with the corresponding string array containing each district's set of counties (R.array.districtx). Currently the second spinner does nothing, and as far as I'm concerned the countySpinner() isn't even called upon.
public void countySpinner() {
switch (selectedDistrict) {
case 0: {
break;
}
case 1: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district1));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 2: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district2));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 3: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district3));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 4: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district4));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 5: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district5));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 6: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district6));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 7: {
break;
}
case 8: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district8));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 9: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district9));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 10: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district10));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 11: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district11));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
case 12: {
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.district12));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view,
int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
break;
}
default: {
break;
}
}
推荐答案
您可以像I want to setup my second spinner according to the choice made in first spinner这样更好地说明问题.然后，您最好这样做，因为您有办法在其中添加很多相等的代码.
You could have stated the problem better like I want to setup my second spinner according to the choice made in first spinner. Then you better do like this as you have way to much equal code in it.
public void districtSpinner() {
ArrayAdapter<String> Dadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(R.array.districtNames));
Dadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
districtSpinner.setAdapter(Dadapter);
districtSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
int selectedDistrict = position+1;
// do yourself a favor and intoduce an empty choice for 7;
countySpinner(selectedDistrict);
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
}
private int getDistrictResourceId ( int districtnr ) {
int resId = R.array.district1;
switch ( districtnr )
{
case 1:
resId = R.array.district1;
break;
case 2:
resId = R.array.district2;
break;
// please add the rest
}
return resId;
}
public void countySpinner( int districtnr) {
int resId = getDistrictResourceId( districtnr );
ArrayAdapter<String> Cadapter = new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_item, getResources().getStringArray(resId));
Cadapter.setDropDownViewResource(android.R.layout.simple_dropdown_item_1line);
countySpinner.setAdapter(Cadapter);
countySpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
public void onNothingSelected(AdapterView<?> parent) {
}
}
);
}
}
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