Need Each fragment to return to home screen when user presess back(without any button in app)

huangapple
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英文:

Need Each fragment to return to home screen when user presess back(without any button in app)

问题

你好，以下是代码的翻译部分：

  1. SO，我正在创建这个包含不同片段的基本应用程序，并且我希望当用户在他的手机上按下返回按钮时，应用程序返回到主页片段。
  3. 主活动

如果您需要更多帮助，请随时提出具体问题。

英文:

SO, I'm creating this basic app that contains different fragments and I want that when the user presses the back button on his phone, The app returns to the home fragment.

Main Activity

  1. public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
  3.     public void book(View view)
  4.     {
  5.         Toast.makeText(this, "You tried to book", Toast.LENGTH_SHORT).show();
  6.     }
  7.     public void submit(View view)
  9.     {
  10.         EditText editText = (EditText) findViewById(R.id.feedbackText);
  11.         if (editText.getText().toString().isEmpty())
  12.         {
  13.             Toast.makeText(this, "Please type something first", Toast.LENGTH_SHORT).show();
  14.         }
  15.         else
  16.         {
  17.             editText.setText("");
  19.             Toast.makeText(this, "Thank You for your feedback", Toast.LENGTH_SHORT).show();
  21.             closeKeyboard();
  22.         }
  23.     }
  25.     private void closeKeyboard()
  26.     {
  27.         View view = this.getCurrentFocus();
  28.         if (view != null)
  29.         {
  30.             InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
  31.             imm.hideSoftInputFromWindow(view.getWindowToken(),0);
  32.         }
  33.     }
  36.     DrawerLayout drawerLayout;
  37.     ActionBarDrawerToggle actionBarDrawerToggle;
  38.     Toolbar toolbar, searchToolbar;
  39.     NavigationView navigationView;
  40.     FragmentManager fragmentManager;
  41.     FragmentTransaction fragmentTransaction;
  42.     Menu search_menu;
  43.     MenuItem item_search;
  44.     Button submitBtn;
  45.     MaterialSearchView searchView;
  46.     EditText email;
  47.     EditText password;
  48.     TextView titleText;
  49.     int counter = 0;
  51.     @Override
  52.     public boolean onCreateOptionsMenu(Menu menu) {
  53.         getMenuInflater().inflate(R.menu.search, menu);
  54.         MenuItem item  = menu.findItem(R.id.action_search);
  55.         searchView.setMenuItem(item);
  56.         return true;
  57.     }
  59.     public void guest(View view)
  60.     {
  61.         fragmentManager = getSupportFragmentManager();
  62.         fragmentTransaction = fragmentManager.beginTransaction();
  63.         fragmentTransaction.replace(R.id.container, new Home());
  64.         fragmentTransaction.commit();
  65.     }
  68.     @Override
  69.     protected void onCreate(Bundle savedInstanceState) {
  70.         super.onCreate(savedInstanceState);
  71.         setContentView(R.layout.activity_main);
  72.         toolbar = findViewById(R.id.toolbar);
  73.         submitBtn = findViewById(R.id.submitBtn);
  74.         titleText = findViewById(R.id.toolbarTitle);
  76.         searchToolbar = (Toolbar)findViewById(R.id.search_toolbar);
  77.         setSupportActionBar(toolbar);
  79.         toolbar.setTitleTextColor(Color.parseColor("#FFFFFF"));
  80.         searchView=(MaterialSearchView)findViewById(R.id.search_view);
  82.         drawerLayout = findViewById(R.id.drawer);
  83.         navigationView = findViewById(R.id.navigationView);
  84.         navigationView.setNavigationItemSelectedListener(this);
  85.         actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.Open, R.string.Close);
  86.         drawerLayout.addDrawerListener(actionBarDrawerToggle);
  87.         actionBarDrawerToggle.setDrawerIndicatorEnabled(true);
  88.         actionBarDrawerToggle.syncState();
  90.         fragmentManager = getSupportFragmentManager();
  91.         fragmentTransaction = fragmentManager.beginTransaction();
  92.         fragmentTransaction.replace(R.id.container, new Home());
  93.         fragmentTransaction.commit();
  94.         titleText.setText(R.string.home);
  97.     }
  100.     @Override
  101.     public boolean onNavigationItemSelected(@NonNull MenuItem item) {
  102.         drawerLayout.closeDrawer(GravityCompat.START);
  103.         if (item.getItemId() == R.id.home)
  104.         {
  105.             fragmentManager = getSupportFragmentManager();
  106.             fragmentTransaction = fragmentManager.beginTransaction();
  107.             fragmentTransaction.replace(R.id.container, new Home());
  108.             fragmentTransaction.commit();
  109.             titleText.setText(R.string.home);
  111.         }
  112.         if (item.getItemId() == R.id.myOrders)
  113.         {
  114.             fragmentManager = getSupportFragmentManager();
  115.             fragmentTransaction = fragmentManager.beginTransaction();
  116.             fragmentTransaction.replace(R.id.container, new MyOrders());
  117.             fragmentTransaction.commit();
  118.             titleText.setText(R.string.myOrders);
  120.         }
  121.         if (item.getItemId() == R.id.refer)
  122.         {
  123.             fragmentManager = getSupportFragmentManager();
  124.             fragmentTransaction = fragmentManager.beginTransaction();
  125.             fragmentTransaction.replace(R.id.container, new Refer());
  126.             fragmentTransaction.commit();
  127.             titleText.setText(R.string.refer);
  129.         }
  130.         if (item.getItemId() == R.id.contact)
  131.         {
  132.             fragmentManager = getSupportFragmentManager();
  133.             fragmentTransaction = fragmentManager.beginTransaction();
  134.             fragmentTransaction.replace(R.id.container, new Contact());
  135.             fragmentTransaction.commit();
  136.             titleText.setText(R.string.contact);
  139.         }
  140.         if (item.getItemId() == R.id.feedback)
  141.         {
  142.             fragmentManager = getSupportFragmentManager();
  143.             fragmentTransaction = fragmentManager.beginTransaction();
  144.             fragmentTransaction.replace(R.id.container, new Feedback());
  145.             fragmentTransaction.commit();
  146.             titleText.setText(R.string.feedback);
  149.         }
  150.         if (item.getItemId() == R.id.settings)
  151.         {
  152.             fragmentManager = getSupportFragmentManager();
  153.             fragmentTransaction = fragmentManager.beginTransaction();
  154.             fragmentTransaction.replace(R.id.container, new Settings());
  155.             fragmentTransaction.commit();
  156.             titleText.setText(R.string.setting);
  159.         }
  160.         if (item.getItemId() == R.id.terms)
  161.         {
  162.             fragmentManager = getSupportFragmentManager();
  163.             fragmentTransaction = fragmentManager.beginTransaction();
  164.             fragmentTransaction.replace(R.id.container, new Terms());
  165.             fragmentTransaction.commit();
  166.             titleText.setText(R.string.terms);
  169.         }
  171.         return true;
  172.     }
  173.         
  174. }

Please help me to figure this out.

答案1

得分: 1

在您的Activity内部使用onBackPress，请尝试以下方法：

  1.     @Override
  2.     public void onBackPressed() {
  3.         if (!(getSupportFragmentManager().findFragmentById(R.id.container) instanceof Home)) {
  4.             fragmentManager = getSupportFragmentManager();
  5.             fragmentTransaction = fragmentManager.beginTransaction();
  6.             fragmentTransaction.replace(R.id.container, new Home());
  7.             fragmentTransaction.commit();
  8.             titleText.setText(R.string.home);
  9.         } else {
  10.             super.onBackPressed();
  11.         }
  12.     }
英文:

using onBackPress inside your Activity try this

  1.     @Override
  2.     public void onBackPressed() {
  3.         if (!(getSupportFragmentManager().findFragmentById(R.id.container) instanceof Home)) {
  4.             fragmentManager = getSupportFragmentManager();
  5.             fragmentTransaction = fragmentManager.beginTransaction();
  6.             fragmentTransaction.replace(R.id.container, new Home());
  7.             fragmentTransaction.commit();
  8.             titleText.setText(R.string.home);
  9.         } else {
  10.             super.onBackPressed();
  11.         }
  12.     }

huangapple
  • 本文由 发表于 2020年8月13日 09:16:42
  • 转载请务必保留本文链接：https://go.coder-hub.com/63386733.html
  • android
  • android-fragments
  • back
  • java
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