我正在使用带有适配器类的动态菜单。当我想将主要活动转到另一个活动时，此时我的导航抽屉处于打开状态。这就是我退回主要活动时导航抽屉处于打开状态的原因。我想看一下，当我想进行主要活动时，关闭导航抽屉。
public class MainActivity extends AppCompatActivity implements
View.OnClickListener {
private ArrayList<MainMenu> arrayList = new ArrayList<>();
private DrawerLayout mDrawerLayout;
private TextView inTime;
private TextView lateEntryInMonth;
private Dashboard dashboard;
private SwipeRefreshLayout pullToRefresh;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SharedPreferences sharedPrefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
Gson gson = new Gson();
String json = sharedPrefs.getString("arraylist", "");
Type type = new TypeToken<ArrayList<MainMenu>>() {}.getType();
arrayList = gson.fromJson(json, type);
pullToRefresh = findViewById(R.id.pullToRefresh);
ImageView notification = findViewById(R.id.notification);
ImageView employeeImage = findViewById(R.id.iv_image);
TextView nameOfEmployee = findViewById(R.id.nameOfEmployee);
ExpandableListView ev_list = findViewById(R.id.ev_menu);
TextView tv_name = findViewById(R.id.tv_name);
RelativeLayout rl_menu = findViewById(R.id.rl_menu);
mDrawerLayout = findViewById(R.id.drawer_layout);
MenuAdapter obj_adapter = new MenuAdapter(MainActivity.this, arrayList);
lateEntryInMonth = findViewById(R.id.numberOfDayLateInMonth);
TextView monthLateEntry = findViewById(R.id.lateEntryMonth);
inTime = findViewById(R.id.today_time);
TextView hrNotice = findViewById(R.id.hr_notice);
hrNotice.setSelected(true);
hrNotice.setSingleLine(true);
dashboard = new Dashboard();
dashboard.setEMPLOYE_ID(PrefUtils.getUserID(getApplicationContext()));
ev_list.setAdapter(obj_adapter);
ev_list.setOnGroupClickListener((parent, v, groupPosition, id) -> {
int childCount = parent.getExpandableListAdapter().getChildrenCount(groupPosition);
if (childCount == 0) {
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
SharedPreferences preferences = getSharedPreferences("ActivityPREF", 0);
preferences.edit().remove("activity_executed").apply();
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
} else {
setListViewHeight(parent, groupPosition);
}
return false;
});
setExpandableListViewHeightBasedOnChildren(ev_list);
tv_name.setText("Home");
rl_menu.setOnClickListener(view -> mDrawerLayout.openDrawer(Gravity.LEFT));
nameOfEmployee.setText(PrefUtils.getUserFullName(getApplicationContext()));
String photoId = PrefUtils.getUserPhotoId(getApplicationContext());
Glide.with(getApplicationContext())
.load(photoId)
.apply(RequestOptions.circleCropTransform())
.into(employeeImage);
monthLateEntry.setText("Late Entry In " + showMonthSummary());
notification.setOnClickListener(this);
new dashboardList().execute();
pullToRefresh.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
new dashboardList().execute();
pullToRefresh.setRefreshing(false);
}
});
}
@Override
protected void onResume() {
super.onResume();
//new dashboardList().execute();
}
@SuppressLint("SetTextI18n")
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.notification:
Toast.makeText(MainActivity.this, "Under Development", Toast.LENGTH_SHORT).show();
break;
}
}
@SuppressLint("StaticFieldLeak")
private class dashboardList extends AsyncTask<String, String, String> {
@Override
protected String doInBackground(String... strings) {
String result;
result = HttpHandler.requestJsonInPOST(Constants.URL_EMPLOYEE_DASHBOARD_LIST_INFO, new Gson().toJson(dashboard));
return result;
}
@Override
protected void onPreExecute() {
super.onPreExecute();
//pullToRefresh.setRefreshing(true);
}
@Override
protected void onPostExecute(String result) {
//pullToRefresh.setRefreshing(false);
super.onPostExecute(result);
if (result != null) {
try {
String lateEntry =new JSONObject(result).getString("totalLate") + " Day";
lateEntryInMonth.setText(lateEntry);
inTime.setText(new JSONObject(result).getString("TodayLoginTime"));
}
catch (JSONException e) {
e.printStackTrace();
}
}
}
}
private void setListViewHeight(ExpandableListView listView, int group) {
ExpandableListAdapter listAdapter = listView.getExpandableListAdapter();
int totalHeight = 0;
int desiredWidth = View.MeasureSpec.makeMeasureSpec(listView.getWidth(),
View.MeasureSpec.EXACTLY);
for (int i = 0; i < listAdapter.getGroupCount(); i++) {
View groupItem = listAdapter.getGroupView(i, false, null, listView);
groupItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
totalHeight += groupItem.getMeasuredHeight();
if (((listView.isGroupExpanded(i)) && (i != group))
|| ((!listView.isGroupExpanded(i)) && (i == group))) {
for (int j = 0; j < listAdapter.getChildrenCount(i); j++) {
View listItem = listAdapter.getChildView(i, j, false, null,
listView);
listItem.measure(desiredWidth, View.MeasureSpec.UNSPECIFIED);
totalHeight += listItem.getMeasuredHeight();
}
}
}
ViewGroup.LayoutParams params = listView.getLayoutParams();
int height = totalHeight
+ (listView.getDividerHeight() * (listAdapter.getGroupCount() - 1));
params.height = height;
listView.setLayoutParams(params);
listView.requestLayout();
}
public static void setExpandableListViewHeightBasedOnChildren(ExpandableListView expandableListView) {
MenuAdapter adapter = (MenuAdapter) expandableListView.getExpandableListAdapter();
if (adapter == null) {
return;
}
int totalHeight = expandableListView.getPaddingTop() + expandableListView.getPaddingBottom();
for (int i = 0; i < adapter.getGroupCount(); i++) {
View groupItem = adapter.getGroupView(i, false, null, expandableListView);
groupItem.measure(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED);
totalHeight += groupItem.getMeasuredHeight();
if (expandableListView.isGroupExpanded(i)) {
for (int j = 0; j < adapter.getChildrenCount(i); j++) {
View listItem = adapter.getChildView(i, j, false, null, expandableListView);
listItem.setLayoutParams(new ViewGroup.LayoutParams(View.MeasureSpec.UNSPECIFIED, View.MeasureSpec.UNSPECIFIED));
listItem.measure(View.MeasureSpec.makeMeasureSpec(0,
View.MeasureSpec.UNSPECIFIED), View.MeasureSpec
.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED));
totalHeight += listItem.getMeasuredHeight();
}
}
}
ViewGroup.LayoutParams params = expandableListView.getLayoutParams();
int height = totalHeight + expandableListView.getDividerHeight() * (adapter.getGroupCount() - 1);
if (height < 10)
height = 100;
params.height = height;
expandableListView.setLayoutParams(params);
expandableListView.requestLayout();
}
private String showMonthSummary() {
Date c = Calendar.getInstance().getTime();
SimpleDateFormat df = new SimpleDateFormat("MMMM", Locale.US);
return df.format(c);
}
@Override
public void onBackPressed() {
super.onBackPressed();
finish();
}
这是适配器类。我也设法参加了这个活动。
public class MenuAdapter extends BaseExpandableListAdapter {
Context context;
ArrayList<MainMenu> arraylist;
public MenuAdapter(Context context, ArrayList<MainMenu> arraylist) {
this.context = context;
this.arraylist = arraylist;
}
@Override
public int getGroupCount() {
return arraylist.size();
}
@Override
public int getChildrenCount(int i) {
return (arraylist.get(i).getSUB_MODULE_LIST() == null || arraylist.get(i).getSUB_MODULE_LIST().isEmpty()) ? 0 : arraylist.get(i).getSUB_MODULE_LIST().size();
}
@Override
public Object getGroup(int i) {
return arraylist.get(i);
}
@Override
public Object getChild(int i, int i1) {
return arraylist.get(i).getSUB_MODULE_LIST().get(i1);
}
@Override
public long getGroupId(int i) {
return i;
}
@Override
public long getChildId(int i, int i1) {
return i1;
}
@Override
public boolean hasStableIds() {
return false;
}
@Override
public View getGroupView(final int i, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.adapter_header, null);
}
TextView tv_header = view.findViewById(R.id.tv_header);
tv_header.setText(arraylist.get(i).getMLINK_NAME());
return view;
}
@Override
public View getChildView(final int i, final int i1, boolean b, View view, ViewGroup viewGroup) {
if (view == null) {
LayoutInflater layoutInflater = (LayoutInflater) this.context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = layoutInflater.inflate(R.layout.adapter_childview, null);
}
TextView tv_state = view.findViewById(R.id.tv_child);
tv_state.setText(arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME());
tv_state.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Daily Work Report")) {
context.startActivity(new Intent(context, DailyWorkReportListActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Employee Contacts")) {
context.startActivity(new Intent(context, EmployeeContactsActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Add Ticket")) {
context.startActivity(new Intent(context, TicketActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("New Ticket")) {
context.startActivity(new Intent(context, TicketActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Leave Application")) {
context.startActivity(new Intent(context, LeaveStatusActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Movement ")) {
context.startActivity(new Intent(context, EmployeeMovementListActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Attendance")) {
context.startActivity(new Intent(context, AttendanceActivity.class));
//getActionBar().setDisplayHomeAsUpEnabled(false);
}else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Office Meal")) {
context.startActivity(new Intent(context, MealManagementUserActivity.class));
}
/*else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Call Information")) {
context.startActivity(new Intent(context, LastCallActivity.class));
} */else {
Toast.makeText(view.getContext(), "Under Development", Toast.LENGTH_SHORT).show();
}
}
});
return view;
}
@Override
public boolean isChildSelectable(int i, int i1) {
return true;
}
答案 0 :(得分：1)
一种实现所需行为的方法是使用接口，该接口在MenuAdapter内部被调用。
创建如下所示的界面：
public interface ActivityChangedListener {
public void onActivityChanged();
}
此接口应该由引用了要关闭的mDrawerLayout的类实现。
在这种情况下，我们可以使Activity实现如下方法：
public class MainActivity extends AppCompatActivity implements
ActivityChangedListener
public void onActivityChanged(){
mDrawerLayout.close();
}
您必须在MenuAdapter内添加以下内容：
public class MenuAdapter extends BaseExpandableListAdapter {
ActivityChangedListener activityChangedListener
public MenuAdapter(Context context, ArrayList<MainMenu> arraylist, ActivityChangedListener acl) {
this.context = context;
this.arraylist = arraylist;
// You could use a setter for this, but care because acl could be null if not set in the right order
this.activityChangedListener = acl;
}
// Now you have to call the listener inside the onClick method in every statement where you switch to a new activity
tv_state.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Daily Work Report")) {
activityChangedListener.onActivityChanged();
context.startActivity(new Intent(context, DailyWorkReportListActivity.class));
} else if (arraylist.get(i).getSUB_MODULE_LIST().get(i1).getMLINK_NAME().equals("Employee Contacts")) {
activityChangedListener.onActivityChanged();
context.startActivity(new Intent(context, EmployeeContactsActivity.class));
}
剩下的唯一事情是编辑MenuAdapter的构造函数调用并传递ActivityChangedListener的实例，在这种情况下它将是this，因为我们的{{1 }}实现接口：
Activity建议此处使用接口以保持抽象性，可扩展性和透明性。