У меня есть 1 действие. Внутри этого действия у меня есть 4 фрагмента. Если я переключаюсь между этими фрагментами, я хочу обработать свой возврат.
Если я нахожусь в каком-либо фрагменте, я должен перейти непосредственно к основному действию, нажав кнопку «Назад» один раз. Как только я достигну активности дома, и если я снова нажму кнопку «Назад», она должна быть закрыта.
ниже моя домашняя деятельность
package com.fuzail.my_app.DatabaseSQLite;
import android.app.DatePickerDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.support.design.widget.NavigationView;
import android.support.v4.app.Fragment;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBar;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.DatePicker;
import android.widget.ImageButton;
import android.widget.TextView;
import com.fuzail.my_app.R;
import java.util.ArrayList;
import java.util.Calendar;
import static android.content.DialogInterface.BUTTON_NEGATIVE;
import static android.content.DialogInterface.BUTTON_POSITIVE;
import static com.fuzail.my_app.Constant.NO;
import static com.fuzail.my_app.Constant.YES;
public class MaccabiDrawerHome extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener,DialogInterface.OnClickListener {
private DrawerLayout mDrawer;
private Toolbar toolbar;
private Menu menu;
NavigationView navView;
private ArrayList<UserModel> list = new ArrayList<UserModel>();
private int currentYear, currentMonth, currentDay;
private SharedPreferenceMaccabi mSharedPreference;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drawer_home);
Fragment fragment = new FragViewProfile();
getSupportFragmentManager().beginTransaction().
add(R.id.content_frame, fragment).
commit();
// Set a Toolbar to replace the ActionBar.
toolbar = (Toolbar) findViewById(R.id.macaabi_myprofile_toolbar);
setSupportActionBar(toolbar);
setSupportActionBar(toolbar);
ActionBar actionBar = getSupportActionBar();
actionBar.setDisplayShowTitleEnabled(false);
toolbar.setNavigationIcon(R.drawable.ic_maccabi_menu);
toolbar.setTitle("My Profile");
// Find our drawer view
mDrawer = (DrawerLayout) findViewById(R.id.drawer_maccabi);
navView = findViewById(R.id.maccabi_navigation);
navView.setNavigationItemSelectedListener(this);
mSharedPreference = SharedPreferenceMaccabi.getInstance(this);
}
@Override
public void onBackPressed() {
Intent i = new Intent(this, MaccabiDrawerHome.class);
FragViewProfile test = (FragViewProfile) getSupportFragmentManager().findFragmentById(R.id.content_frame);
if (test != null && test.isVisible()) {
finish();
}
else {
startActivity(i);
}
}
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
String title = "";
Fragment fragment = null;
switch (id) {
case R.id.mallmemb:
fragment = new FragAllMembers();
toolbar.setTitle("All Members");
menu.findItem(R.id.item_cal).setVisible(false);
menu.findItem(R.id.item_edit).setVisible(false);
break;
case R.id.mlikes:
fragment = new FragLikes();
((FragLikes) fragment).getAllLikedByData(list);
toolbar.setTitle("likes");
menu.findItem(R.id.item_cal).setVisible(false);
menu.findItem(R.id.item_edit).setVisible(false);
break;
case R.id.mlogout:
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MaccabiDrawerHome.this);
alertDialogBuilder.setTitle("Logout");
alertDialogBuilder.setMessage("Are you sure you want to logout");
alertDialogBuilder.setCancelable(false);
alertDialogBuilder.setPositiveButton("YES", this);
alertDialogBuilder.setNegativeButton("NO", this);
AlertDialog alertDialog = alertDialogBuilder.create();
alertDialog.show();
return true;
}
if (fragment != null) {
getSupportFragmentManager().beginTransaction().
replace(R.id.content_frame, fragment).
commit();
getSupportActionBar().setTitle(title);
mDrawer.closeDrawers();
return true;
}
return false;
}
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case BUTTON_POSITIVE:
mSharedPreference.clearData();
startActivity(new Intent(MaccabiDrawerHome.this, MacaabiEmailHome.class));
break;
case BUTTON_NEGATIVE:
dialog.dismiss();
break;
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
this.menu = menu;
getMenuInflater().inflate(R.menu.menutoolbar, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
mDrawer.openDrawer(GravityCompat.START);
return true;
case R.id.item_edit:
menu.findItem(R.id.item_edit).setVisible(false);
menu.findItem(R.id.item_cal).setVisible(true);
toolbar.setTitle("Edit Profile");
getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, new FragEditProfile()).commit();
return true;
case R.id.item_cal:
DatePickerDialog datePickerDialog = new DatePickerDialog(this, new DatePickerDialog.OnDateSetListener() {
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
populateSetDate(year, month + 1, dayOfMonth);
}
}, currentYear, currentMonth, currentDay);
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.YEAR, currentYear - 4);
calendar.add(Calendar.MONTH, currentMonth);
datePickerDialog.getDatePicker().setMaxDate(calendar.getTimeInMillis());
datePickerDialog.setCancelable(false);
datePickerDialog.show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
return super.onPrepareOptionsMenu(menu);
}
/* populateSetDate method is used
to display the data in a textView
in edit profile fragment*/
public void populateSetDate(int year, int month, int day) {
TextView dob = (TextView) findViewById(R.id.dob);
dob.setText(month + "/" + day + "/" + year);
String a1 = getAge(year, month, day);
TextView agess = (TextView) findViewById(R.id.age);
agess.setText(a1);
}
/* getAge method is used to calculate
the age and then store in a textView
in edit profile fragment*/
private String getAge(int year, int month, int day) {
Calendar dob = Calendar.getInstance();
Calendar today = Calendar.getInstance();
dob.set(year, month, day);
int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);
if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)) {
age--;
}
Integer ageInt = new Integer(age);
String ageS = ageInt.toString();
Log.d("age", "getAge: " + ageS);
return ageS;
}
public void newcountFrag(){
Fragment fragment;
fragment = new FragLikes();
toolbar.setTitle("likes");
menu.findItem(R.id.item_cal).setVisible(false);
menu.findItem(R.id.item_edit).setVisible(false);
getSupportFragmentManager().beginTransaction().replace(R.id.content_frame, new FragLikes()).commit();
}
}