我正在使用MultiSellectionSpinner从列表中选择多个项目并将其存储在MySql数据库中。在编辑活动中，我想显示从MySql到Custom Spinner的选定列表以进行编辑。我的事件列表中有一些值。
例如，我的eventlist包含a，b，c，d，e，z，x，s。
我想从数组中获取eventlist值的位置。下面是带有数组的MultiSellectionSpinner。低于onCreate中的代码。
final String[] spinevent = {"a","b",c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","x" };
multiSelectionSpinner = (MultiSelectionSpinner) findViewById(R.id.eventlistSpinner);
multiSelectionSpinner.setItems(spinevent);
//multiSelectionSpinner.setSelection(new int[]{2, 6});
multiSelectionSpinner.setListener(this);
bellow是我的自定义微调器类
public class MultiSelectionSpinner extends android.support.v7.widget.AppCompatSpinner implements
DialogInterface.OnMultiChoiceClickListener {
public interface OnMultipleItemsSelectedListener{
void selectedIndices(List<Integer> indices);
void selectedStrings(List<String> strings);
}
private OnMultipleItemsSelectedListener listener;
String[] _items = null;
boolean[] mSelection = null;
boolean[] mSelectionAtStart = null;
String _itemsAtStart = null;
ArrayAdapter<String> simple_adapter;
public MultiSelectionSpinner(Context context) {
super(context);
simple_adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item);
super.setAdapter(simple_adapter);
}
public MultiSelectionSpinner(Context context, AttributeSet attrs) {
super(context, attrs);
simple_adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item);
super.setAdapter(simple_adapter);
}
public void setListener(OnMultipleItemsSelectedListener listener){
this.listener = listener;
}
public void onClick(DialogInterface dialog, int which, boolean isChecked) {
if (mSelection != null && which < mSelection.length) {
mSelection[which] = isChecked;
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
} else {
throw new IllegalArgumentException(
"Argument 'which' is out of bounds.");
}
}
@Override
public boolean performClick() {
AlertDialog.Builder builder = new AlertDialog.Builder(getContext());
builder.setTitle("Please Select !!!");
builder.setMultiChoiceItems(_items, mSelection, this);
_itemsAtStart = getSelectedItemsAsString();
builder.setPositiveButton("Submit", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
System.arraycopy(mSelection, 0, mSelectionAtStart, 0, mSelection.length);
listener.selectedIndices(getSelectedIndices());
listener.selectedStrings(getSelectedStrings());
}
});
builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
simple_adapter.clear();
simple_adapter.add(_itemsAtStart);
System.arraycopy(mSelectionAtStart, 0, mSelection, 0, mSelectionAtStart.length);
}
});
builder.show();
return true;
}
@Override
public void setAdapter(SpinnerAdapter adapter) {
throw new RuntimeException(
"setAdapter is not supported by MultiSelectSpinner.");
}
public void setItems(String[] items) {
_items = items;
mSelection = new boolean[_items.length];
mSelectionAtStart = new boolean[_items.length];
simple_adapter.clear();
simple_adapter.add(_items[0]);
Arrays.fill(mSelection, false);
mSelection[0] = true;
mSelectionAtStart[0] = true;
}
public void setItems(List<String> items) {
_items = items.toArray(new String[items.size()]);
mSelection = new boolean[_items.length];
mSelectionAtStart = new boolean[_items.length];
simple_adapter.clear();
simple_adapter.add(_items[0]);
Arrays.fill(mSelection, false);
mSelection[0] = true;
}
public void setSelection(String[] selection) {
for (int i = 0; i < mSelection.length; i++) {
mSelection[i] = false;
mSelectionAtStart[i] = false;
}
for (String cell : selection) {
for (int j = 0; j < _items.length; ++j) {
if (_items[j].equals(cell)) {
mSelection[j] = true;
mSelectionAtStart[j] = true;
}
}
}
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
}
public void setSelection(List<String> selection) {
for (int i = 0; i < mSelection.length; i++) {
mSelection[i] = false;
mSelectionAtStart[i] = false;
}
for (String sel : selection) {
for (int j = 0; j < _items.length; ++j) {
if (_items[j].equals(sel)) {
mSelection[j] = true;
mSelectionAtStart[j] = true;
}
}
}
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
}
public void setSelection(int index) {
for (int i = 0; i < mSelection.length; i++) {
mSelection[i] = false;
mSelectionAtStart[i] = false;
}
if (index >= 0 && index < mSelection.length) {
mSelection[index] = true;
mSelectionAtStart[index] = true;
} else {
throw new IllegalArgumentException("Index " + index
+ " is out of bounds.");
}
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
}
public void setSelection(int[] selectedIndices) {
for (int i = 0; i < mSelection.length; i++) {
mSelection[i] = false;
mSelectionAtStart[i] = false;
}
for (int index : selectedIndices) {
if (index >= 0 && index < mSelection.length) {
mSelection[index] = true;
mSelectionAtStart[index] = true;
} else {
throw new IllegalArgumentException("Index " + index
+ " is out of bounds.");
}
}
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
}
public List<String> getSelectedStrings() {
List<String> selection = new LinkedList<>();
for (int i = 0; i < _items.length; ++i) {
if (mSelection[i]) {
selection.add(_items[i]);
}
}
return selection;
}
public List<Integer> getSelectedIndices() {
List<Integer> selection = new LinkedList<>();
for (int i = 0; i < _items.length; ++i) {
if (mSelection[i]) {
selection.add(i);
}
}
return selection;
}
private String buildSelectedItemString() {
StringBuilder sb = new StringBuilder();
boolean foundOne = false;
for (int i = 0; i < _items.length; ++i) {
if (mSelection[i]) {
if (foundOne) {
sb.append(", ");
}
foundOne = true;
sb.append(_items[i]);
}
}
return sb.toString();
}
public String getSelectedItemsAsString() {
StringBuilder sb = new StringBuilder();
boolean foundOne = false;
for (int i = 0; i < _items.length; ++i) {
if (mSelection[i]) {
if (foundOne) {
sb.append(", ");
}
foundOne = true;
sb.append(_items[i]);
}
}
return sb.toString();
}
}
对于其他微调器，我使用下面的代码来获取arrray中String的位置。
int eventPosition = eventadapter.getPosition(uevent);
event.setSelection(eventPosition);
我知道我必须在自定义微调器中创建getPosition（）方法。我不知道那是怎么回事。
如果您有任何疑问，请发表评论。