我试图在超出限制时取消选择。在下面给出的代码中，当最大选择限制超过时，我能够实现吐司。但是当我试图在限制超过时禁用或取消选择项目时，它不会工作
public class MultiSelectionSpinner1 extends Spinner implements
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 MultiSelectionSpinner1(Context context) {
super(context);
simple_adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item);
super.setAdapter(simple_adapter);
}
public MultiSelectionSpinner1(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) {
Log.e("_items.length", "_items.length" + _items.length);
Log.e("_itemsAtStart", "_itemsAtStart" + _itemsAtStart);
// listener.selectedStrings(getSelectedStrings());
if(getSelectedIndices().size()<3){
mSelection[which] = isChecked;
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
}else
{
Toast.makeText(getContext(),"Exceeds",Toast.LENGTH_SHORT).show();
setDiselection(which);
}
//listener.selectedIndices(getSelectedIndices());
} 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 setDiselection(int index) {
if (index >= 0 && index < mSelection.length) {
mSelection[index] = false;
mSelectionAtStart[index] = false;
} else {
throw new IllegalArgumentException("Index " + index
+ " is out of bounds.");
}
simple_adapter.clear();
simple_adapter.notifyDataSetChanged();
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();
}
}
答案 0 :(得分：5)
试试这个。我修改了你的public void setDeselection（int index）和public boolean performClick（）方法。
public class MultiSelectSpinner1 extends Spinner implements
DialogInterface.OnMultiChoiceClickListener {
private static final String TAG = MultiSelectSpinner1.class.getSimpleName();
String[] _items = null;
boolean[] mSelection = null;
boolean[] mSelectionAtStart = null;
String _itemsAtStart = null;
ArrayAdapter<String> simple_adapter;
private OnMultipleItemsSelectedListener listener;
AlertDialog alertDialog;
public MultiSelectSpinner1(Context context) {
super(context);
simple_adapter = new ArrayAdapter<>(context,
android.R.layout.simple_spinner_item);
super.setAdapter(simple_adapter);
}
public MultiSelectSpinner1(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) {
Log.e("_items.length", "_items.length" + _items.length);
Log.e("_itemsAtStart", "_itemsAtStart" + _itemsAtStart);
if (getSelectedIndices().size() < 3) {
mSelection[which] = isChecked;
simple_adapter.clear();
simple_adapter.add(buildSelectedItemString());
} else {
Toast.makeText(getContext(),"Exceeds",Toast.LENGTH_SHORT).show();
setDeselection(which);
}
} else {
throw new IllegalArgumentException(
"Argument 'which' is out of bounds.");
}
}
@Override
public boolean performClick() {
buildDialogue();
return true;
}
private void buildDialogue() {
if(alertDialog!=null&&alertDialog.isShowing())
alertDialog.dismiss();
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);
if (listener != null) {
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);
}
});
alertDialog = builder.create();
alertDialog.show();
}
@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 setDeselection(int index) {
Log.d(TAG, "setDeselection() called with: " + "index = [" + index + "]");
if (index >= 0 && index < mSelection.length) {
mSelection[index] = false;
mSelectionAtStart[index] = false;
} else {
throw new IllegalArgumentException("Index " + index
+ " is out of bounds.");
}
simple_adapter.clear();
simple_adapter.notifyDataSetChanged();
simple_adapter.add(buildSelectedItemString());
buildDialogue();
}
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();
}
public interface OnMultipleItemsSelectedListener {
void selectedIndices(List<Integer> indices);
void selectedStrings(List<String> strings);
}
}