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

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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:

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

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

public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {

    public void book(View view)
    {
        Toast.makeText(this, "You tried to book", Toast.LENGTH_SHORT).show();
    }
    public void submit(View view)

    {
        EditText editText = (EditText) findViewById(R.id.feedbackText);
        if (editText.getText().toString().isEmpty())
        {
            Toast.makeText(this, "Please type something first", Toast.LENGTH_SHORT).show();
        }
        else
        {
            editText.setText("");

            Toast.makeText(this, "Thank You for your feedback", Toast.LENGTH_SHORT).show();

            closeKeyboard();
        }
    }

    private void closeKeyboard()
    {
        View view = this.getCurrentFocus();
        if (view != null)
        {
            InputMethodManager imm = (InputMethodManager)getSystemService(Context.INPUT_METHOD_SERVICE);
            imm.hideSoftInputFromWindow(view.getWindowToken(),0);
        }
    }


    DrawerLayout drawerLayout;
    ActionBarDrawerToggle actionBarDrawerToggle;
    Toolbar toolbar, searchToolbar;
    NavigationView navigationView;
    FragmentManager fragmentManager;
    FragmentTransaction fragmentTransaction;
    Menu search_menu;
    MenuItem item_search;
    Button submitBtn;
    MaterialSearchView searchView;
    EditText email;
    EditText password;
    TextView titleText;
    int counter = 0;

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.search, menu);
        MenuItem item  = menu.findItem(R.id.action_search);
        searchView.setMenuItem(item);
        return true;
    }

    public void guest(View view)
    {
        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container, new Home());
        fragmentTransaction.commit();
    }


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        toolbar = findViewById(R.id.toolbar);
        submitBtn = findViewById(R.id.submitBtn);
        titleText = findViewById(R.id.toolbarTitle);

        searchToolbar = (Toolbar)findViewById(R.id.search_toolbar);
        setSupportActionBar(toolbar);

        toolbar.setTitleTextColor(Color.parseColor("#FFFFFF"));
        searchView=(MaterialSearchView)findViewById(R.id.search_view);

        drawerLayout = findViewById(R.id.drawer);
        navigationView = findViewById(R.id.navigationView);
        navigationView.setNavigationItemSelectedListener(this);
        actionBarDrawerToggle = new ActionBarDrawerToggle(this, drawerLayout, toolbar, R.string.Open, R.string.Close);
        drawerLayout.addDrawerListener(actionBarDrawerToggle);
        actionBarDrawerToggle.setDrawerIndicatorEnabled(true);
        actionBarDrawerToggle.syncState();

        fragmentManager = getSupportFragmentManager();
        fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.container, new Home());
        fragmentTransaction.commit();
        titleText.setText(R.string.home);


    }


    @Override
    public boolean onNavigationItemSelected(@NonNull MenuItem item) {
        drawerLayout.closeDrawer(GravityCompat.START);
        if (item.getItemId() == R.id.home)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Home());
            fragmentTransaction.commit();
            titleText.setText(R.string.home);

        }
        if (item.getItemId() == R.id.myOrders)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new MyOrders());
            fragmentTransaction.commit();
            titleText.setText(R.string.myOrders);

        }
        if (item.getItemId() == R.id.refer)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Refer());
            fragmentTransaction.commit();
            titleText.setText(R.string.refer);

        }
        if (item.getItemId() == R.id.contact)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Contact());
            fragmentTransaction.commit();
            titleText.setText(R.string.contact);


        }
        if (item.getItemId() == R.id.feedback)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Feedback());
            fragmentTransaction.commit();
            titleText.setText(R.string.feedback);


        }
        if (item.getItemId() == R.id.settings)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Settings());
            fragmentTransaction.commit();
            titleText.setText(R.string.setting);


        }
        if (item.getItemId() == R.id.terms)
        {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Terms());
            fragmentTransaction.commit();
            titleText.setText(R.string.terms);


        }

        return true;
    }
        
}

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:

    @Override
    public void onBackPressed() {
        if (!(getSupportFragmentManager().findFragmentById(R.id.container) instanceof Home)) {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Home());
            fragmentTransaction.commit();
            titleText.setText(R.string.home);
        } else {
            super.onBackPressed();
        }
    }
英文:

using onBackPress inside your Activity try this

    @Override
    public void onBackPressed() {
        if (!(getSupportFragmentManager().findFragmentById(R.id.container) instanceof Home)) {
            fragmentManager = getSupportFragmentManager();
            fragmentTransaction = fragmentManager.beginTransaction();
            fragmentTransaction.replace(R.id.container, new Home());
            fragmentTransaction.commit();
            titleText.setText(R.string.home);
        } else {
            super.onBackPressed();
        }
    }

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
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