我的viewpager里面有几个片段。当用户按下按钮时我需要确认。但是，除非我访问最后一页，否则它不会被调用。
public class Create_Safety_CheckList_MainFragment extends Fragment
implements View.OnClickListener, Observer {
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_create_safety_checklist_pager_main, container, false);
initializeUI();
return view;
}
private void initializeUI() {
setHeader(getResources().getString(R.string.safety_check_list_checklist_screen_name));
addFragments();
mPager = (ViewPager) view.findViewById(R.id.viewPager_home_screen_activity);
mPagerAdapter = new ScreenSlidePagerAdapter(getChildFragmentManager());
mPager.setOffscreenPageLimit(fragmentArrayList.size());
mPager.setOnPageChangeListener(onPageChangeListener);
mPager.setAdapter(mPagerAdapter);
// mPager.setOnTouchListener(new View.OnTouchListener() {
//
// @Override
// public boolean onTouch(View v, MotionEvent event) {
// v.getParent().requestDisallowInterceptTouchEvent(true);
// return false;
// }
// });
customTextViewChecklistName = (CustomTextView) view.findViewById(R.id.textView_New_Checklist_Name);
if (createChecklistObservationModel.getChecklistName() != null)
customTextViewChecklistName.setText(createChecklistObservationModel.getChecklistName());
}
private void addFragments() {
createChecklistAdditionalTabFragment = new CreateChecklistAdditionalTabFragment();
fragmentArrayList.add(createChecklistAdditionalTabFragment);
Bundle bundle = getArguments();
if (bundle != null) {
if (bundle.containsKey("***")) {
String response = spcl_databaseHandler.getSpecificChecklistAdditionals(bundle.getString("checklistID"));
try {
JSONObject jsonObject = new JSONObject(response);
JSONObject dataJsonObject = jsonObject.getJSONObject("Data");
JSONArray checkListAdditionalFieldDtoJsonArray = dataJsonObject.getJSONArray("***");
int additionalsLength = checkListAdditionalFieldDtoJsonArray.length();
if (additionalsLength > 0) {
dataJsonObject.getJSONArray("***").toString());
additionalInfoFragment = new Additional_Information_Fragment();
fragmentArrayList.add(additionalInfoFragment);
}
JSONArray jsonGroupsArray = dataJsonObject.getJSONArray("***");
int groupsLength = jsonGroupsArray.length();
for (int i = 0; i < groupsLength; i++) {
JSONObject groupJsonObject = (JSONObject) jsonGroupsArray.get(i);
JSONArray questionsJsonArray = groupJsonObject.getJSONArray("Questions");
int questionsLength = questionsJsonArray.length();
for (int j = 0; j < questionsLength; j++) {
checklistGroupsDiscussionQuestionOneFragment = new ChecklistGroupsDiscussionQuestionOneFragment();
checklistGroupsDiscussionQuestionOneFragment.setArguments(bundle1);
fragmentArrayList.add(checklistGroupsDiscussionQuestionOneFragment);
}
JSONArray subGroupsJsonArray = groupJsonObject.getJSONArray("SubGroups");
int subGroupsJsonArrayLength = subGroupsJsonArray.length();
for (int j = 0; j < subGroupsJsonArrayLength; j++) {
JSONObject subGroupObject = subGroupsJsonArray.getJSONObject(j);
JSONArray subGroupQuestionsJsonArray = subGroupObject.getJSONArray("Questions");
int subGroupQuestionsJsonArrayLength = subGroupQuestionsJsonArray.length();
for (int k = 0; k < subGroupQuestionsJsonArrayLength; k++) {
checklistGroupsDiscussionQuestionOneFragment = new ChecklistGroupsDiscussionQuestionOneFragment(); fragmentArrayList.add(checklistGroupsDiscussionQuestionOneFragment);
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
questionsFragment = new Other_Questions_Fragment();
membersFragment = new Inspection_Members_Fragment();
fragmentArrayList.add(questionsFragment);
fragmentArrayList.add(membersFragment);
}
private void setHeader(String headerTitle) {
}
ViewPager.OnPageChangeListener onPageChangeListener = new ViewPager.OnPageChangeListener() {
@Override
public void onPageSelected(int pageNumber) {
}
@Override
public void onPageScrolled(int pageNumber, float positionOffset,
int positionOffsetPixels) {
// mPager.getParent().requestDisallowInterceptTouchEvent(true);
showArrows(pageNumber);
}
@Override
public void onPageScrollStateChanged(int state) {
}
};
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.imageView_Next:
break;
case R.id.imageView_Previous:
break;
case R.id.textView_Cancel :
callToCloseDialog();
break;
default:
break;
}
}
private void callToCloseDialog() {
if (SystemClock.elapsedRealtime() - mLastClickTime < 1000) {
return;
}
mLastClickTime = SystemClock.elapsedRealtime();
final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage(getResources().getString(R.string.cancel_dialog_message))
.setTitle("Warning");
builder.setPositiveButton(getResources().getString(R.string.cancel_dialog_yes_button), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
getActivity().getSupportFragmentManager().popBackStackImmediate(getResources().getString(R.string.new_checklist_fragment), FragmentManager.POP_BACK_STACK_INCLUSIVE);
}
});
builder.setNegativeButton(getResources().getString(R.string.cancel_dialog_no_button), new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked cancel button
dialog.dismiss();
}
});
AlertDialog alert = builder.create();
alert.show();
}
@Override
public void update(Observable observable, Object o) {
}
/**
* A simple pager adapter that represents 3 objects, in sequence.
*/
private class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
public ScreenSlidePagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
return fragmentArrayList.get(position);
}
@Override
public int getCount() {
return fragmentArrayList.size();
}
}
private void showArrows(int pageNumber) {
}
@Override
public void onResume() {
super.onResume();
EventBus.getDefault().register(this);
getView().setFocusableInTouchMode(true);
getView().requestFocus();
getView().setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
callToCloseDialog();
return true;
}
});
}
@Override
public void onPause() {
EventBus.getDefault().unregister(this);
super.onPause();
}
@Subscribe
public void onEvent(QuestionResponsesModel questionResponsesModel){
}
}
仅保留Viewpager＆amp;的代码。片段加载。
答案 0 :(得分：1)
默认情况下Fragment没有任何反向按下事件，因此您必须使用以下代码通过Activity onBackPressed()方法进行管理。
在您的“活动”中覆盖onBackPressed()方法并对其进行“应用检查”。
@Override
public void onBackPressed() {
// put condition here
if("Your Fragment is Visible"){
//Apply confirmation check here
}
else{
super.onBackPressed();
}
}
答案 1 :(得分：0)
您可以在活动中覆盖此方法并收听backpress
public class MainActivity extends Activity {
...
@Override
public boolean dispatchKeyEvent(KeyEvent event)
{
int action = event.getAction();
int keyCode = event.getKeyCode();
switch (keyCode)
{
case KeyEvent.KEYCODE_BACK:
if (action == KeyEvent.ACTION_DOWN)
{
Log.v("myApp", "Back button pressed.");
return true;
}
default:
return false;
}
return false;
}
}