如何解决如何使用单选复选框android在AlertDialog中选择条目？
| 我有一个带有单选列表和两个按钮的警报对话框：一个“ 0”按钮和一个“ 1”按钮。下面的代码显示了我如何实现它。private final Dialog createListFile(final String[] fileList) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle(\"Compare with:\");
builder.setSingleChoiceItems(fileList,-1,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int whichButton) {
Log.d(TAG,\"The wrong button was tapped: \" + fileList[whichButton]);
}
});
builder.setPositiveButton(\"OK\",int whichButton) {}
});
builder.setNegativeButton(\"Cancel\",int whichButton) {}
});
return builder.create();
}
解决方法
使用最终变量显然是行不通的（因为在声明时只能分配一次）。所谓的\“ global \”变量通常是代码的味道（尤其是当它们成为Activity类的一部分时，通常在其中创建AlertDialogs）。
较干净的解决方案是将DialogInterface对象转换为AlertDialog，然后调用getListView（）。getCheckedItemPosition（）。像这样：
new AlertDialog.Builder(this)
.setSingleChoiceItems(items,null)
.setPositiveButton(R.string.ok_button_label,new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int whichButton) {
dialog.dismiss();
int selectedPosition = ((AlertDialog)dialog).getListView().getCheckedItemPosition();
// Do something useful withe the position of the selected radio button
}
})
.show();
DialogFragment
public interface OnDialogSelectorListener {
public void onSelectedOption(int selectedIndex);
}
public Dialog onCreateDialog(Bundle savedInstanceState) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setTitle(R.string.select);
builder.setSingleChoiceItems(mResourceArray,mSelectedIndex,this);
builder.setPositiveButton(R.string.ok,this);
builder.setNegativeButton(R.string.cancel,this);
return builder.create();
}
builder.setSingleChoiceItems(mResourceArray,this);
@Override
public void onClick(DialogInterface dialog,int which) {
switch (which) {
case Dialog.BUTTON_NEGATIVE: // Cancel button selected,do nothing
dialog.cancel();
break;
case Dialog.BUTTON_POSITIVE: // OK button selected,send the data back
dialog.dismiss();
// message selected value to registered callbacks with the
// selected value.
mDialogSelectorCallback.onSelectedOption(mSelectedIndex);
break;
default: // choice item selected
// store the new selected value in the static variable
mSelectedIndex = which;
break;
}
}
FragmentActivity
final SelectorDialog sd = SelectorDialog.newInstance(R.array.selector_array,preSelectedValue);
sd.show(getSupportFragmentManager(),TAG);
FragmentActivity
OnDialogSelectorListener
public class MyActivity extends FragmentActivity implements OnDialogSelectorListener {
// ....
public void onSelectedOption(int selectedIndex) {
// do something with the newly selected index
}
}
public class SelectorDialog extends DialogFragment implements OnClickListener {
static final String TAG = \"SelectorDialog\";
static int mResourceArray;
static int mSelectedIndex;
static OnDialogSelectorListener mDialogSelectorCallback;
public interface OnDialogSelectorListener {
public void onSelectedOption(int dialogId);
}
public static DialogSelectorDialog newInstance(int res,int selected) {
final DialogSelectorDialog dialog = new DialogSelectorDialog();
mResourceArray = res;
mSelectedIndex = selected;
return dialog;
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mDialogSelectorCallback = (OnDialogSelectorListener)activity;
} catch (final ClassCastException e) {
throw new ClassCastException(activity.toString() + \" must implement OnDialogSelectorListener\");
}
}
public Dialog onCreateDialog(Bundle savedInstanceState) {
final AlertDialog.Builder builder = new AlertDialog.Builder(this.getActivity());
builder.setTitle(R.string.select);
builder.setSingleChoiceItems(mResourceArray,this);
builder.setPositiveButton(R.string.ok,this);
builder.setNegativeButton(R.string.cancel,this);
return builder.create();
}
@Override
public void onClick(DialogInterface dialog,int which) {
switch (which) {
case Dialog.BUTTON_NEGATIVE:
dialog.cancel();
break;
case Dialog.BUTTON_POSITIVE:
dialog.dismiss();
// message selected value to registered calbacks
mDialogSelectorCallback.onSelectedOption(mSelectedIndex);
break;
default: // choice selected click
mSelectedIndex = which;
break;
}
}
}
Fragment
public void setDialogSelectorListener (OnDialogSelectorListener listener) {
this.mListener = listener;
}
public class MyFragment extends Fragment implements SelectorDialog.OnDialogSelectorListener {
// ....
public void onSelectedOption(int selectedIndex) {
// do something with the newly selected index
}
}
final SelectorDialog sd = SelectorDialog.newInstance(R.array.selector_array,preSelectedValue);
// this is a reference to MyFragment
sd.setDialogSelectorListener(this);
// mActivity is just a reference to the activity attached to MyFragment
sd.show(this.mActivity.getSupportFragmentManager(),TAG);
final CharSequence[] choice = {\"Choose from Gallery\",\"Capture a photo\"};
int from; //This must be declared as global !
AlertDialog.Builder alert = new AlertDialog.Builder(activity);
alert.setTitle(\"Upload Photo\");
alert.setSingleChoiceItems(choice,-1,new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
if (choice[which] == \"Choose from Gallery\") {
from = 1;
} else if (choice[which] == \"Capture a photo\") {
from = 2;
}
}
});
alert.setPositiveButton(\"OK\",int which) {
if (from == 0) {
Toast.makeText(activity,\"Select One Choice\",Toast.LENGTH_SHORT).show();
} else if (from == 1) {
// Your Code
} else if (from == 2) {
// Your Code
}
}
});
alert.show();
CharSequence[] choices = {\"Choice1\",\"Choice2\",\"Choice3\"};
boolean[] choicesInitial = {false,true,false};
AlertDialog.Builder alertDialogBuilder = new MaterialAlertDialogBuilder(getContext())
.setTitle(title)
.setPositiveButton(\"Accept\",null)
.setNeutralButton(\"Cancel\",null)
.setMultiChoiceItems(choices,choicesInitial,new DialogInterface.OnMultiChoiceClickListener() {
@Override
public void onClick(DialogInterface dialog,int which,boolean isChecked) {
}
});
alertDialogBuilder.show();
final String[] fonts = {\"Small\",\"Medium\",\"Large\",\"Huge\"};
AlertDialog.Builder builder = new AlertDialog.Builder(TopicDetails.this);
builder.setTitle(\"Select a text size\");
builder.setItems(fonts,new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog,int which) {
if (\"Small\".equals(fonts[which])) {
Toast.makeText(MainActivity.this,\"you nailed it\",Toast.LENGTH_SHORT).show();
}
else if (\"Medium\".equals(fonts[which])) {
Toast.makeText(MainActivity.this,\"you cracked it\",Toast.LENGTH_SHORT).show();
}
else if (\"Large\".equals(fonts[which])){
Toast.makeText(MainActivity.this,\"you hacked it\",Toast.LENGTH_SHORT).show();
}
else if (\"Huge\".equals(fonts[which])){
Toast.makeText(MainActivity.this,\"you digged it\",Toast.LENGTH_SHORT).show();
}
// the user clicked on colors[which]
}
});
builder.show();
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