如何让 onBackPressed()
从每个 fragment 继续 HomeFragment 或转到上一个 fragment 。
这是默认情况下设置 fragment 的代码 Home fragment 在应用程序启动时打开但在返回时按下应用程序关闭。 需要帮助解决,谢谢 这是我的 MainActivityDrawer 类
private Toolbar mToolbar;
private FragmentDrawer drawerFragment;
GpsTrackerAlarmReceiver alarm = new GpsTrackerAlarmReceiver();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_drawer);
mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayShowHomeEnabled(true);
drawerFragment = (FragmentDrawer)
getSupportFragmentManager().findFragmentById(R.id.fragment_navigation_drawer);
drawerFragment.setUp(R.id.fragment_navigation_drawer, (DrawerLayout) findViewById(R.id.drawer_layout), mToolbar);
drawerFragment.setDrawerListener(this);
alarm.setAlarm(this);
// display the first navigation drawer view on app launch
displayView(0);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_help) {
return true;
}
if(id == R.id.action_search){
Toast.makeText(getApplicationContext(), "Search action is selected!", Toast.LENGTH_SHORT).show();
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public void onDrawerItemSelected(View view, int position) {
displayView(position);
}
private void displayView(int position) {
Fragment fragment = null;
String title = getString(R.string.app_name);
switch (position) {
case 0:
fragment = new HomeFragment();
title = getString(R.string.title_home);
break;
case 1:
fragment = new ProfileFragment();
title = getString(R.string.title_profile);
break;
case 2:
fragment = new ContactsFragment();
title = getString(R.string.title_contacts);
break;
case 3:
fragment = new GeoFencFragment();
title = getString(R.string.title_geofence);
break;
case 4:
fragment = new HistoryFragment();
title = getString(R.string.title_history);
break;
case 5:
fragment = new SettingFragment();
title = getString(R.string.title_settimg);
break;
default:
break;
}
if (fragment != null) {
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
fragmentTransaction.replace(R.id.container_body, fragment);
fragmentTransaction.commit();
// set the toolbar title
getSupportActionBar().setTitle(title);
}
}
@Override
public void onResume() {
Log.d(TAG, "onResume");
super.onResume();
}
@Override
protected void onStop() {
super.onStop();
}}
最佳答案
试试这个
getFragmentManager().beginTransaction().
remove(this).commit();
或使用popBackStackImmediate()
在 commit() 之前使用 addToBackstack()
。在您的 Activity 中
当你想删除 fragment 时使用popBackStackImmediate()
关于android - 以编程方式返回到上一个 fragment ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/38971283/