Fragment.replace不删除一个片段，与多个其他片段一起使用
编辑：以下问题出现在我的三星Galaxy S3上，但是，当我在索尼Xperia Z3 +上运行相同的应用时，它根本不显示WIFI列表。 ： - /
我的应用程序有一种奇怪的情况。我目前有五个不同的片段。除了一个FragmentTransaction之外，所有这些都按预期工作
最初，当我启动我的应用时，我使用了其中一个Android Studio模板，但这似乎严重过度，因为它使用Fragments代替ListView来列出我的WIFI项目。我用Android开发了一段时间已经有一段时间了，所以我正在追赶。
我将代码留在原地并继续开发界面。当我最终决定删除使用Fragment“items”填充主容器的代码并将其替换为包含Fragment的{{1}}时，出现了麻烦。
当我从菜单中选择一个新项目时，我的所有ListView按预期工作并按预期更换，但新的Fragments除外，一旦我选择它，它将保留在后台。
在我选择之后，如果我选择其他ListView Fragment，他们会按照自己的意愿进行更改，但第一个会保留原位。
我发现最接近我的情况的问题是this one，但它对我没有帮助。
选择问题Fragments和另一个Fragment之后，这就是我的屏幕的样子：
我的Fragment MainActivity方法：
onCreate()我的 @Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
setupWifiScan();
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Scanning for devices...", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
scanForNetworks(view);
}
});
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
if(findViewById(R.id.fragment_container) != null){
if(savedInstanceState != null){
return;
}
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
WifiFragment wifiFragment = new WifiFragment();
wifiFragment.setArguments(getIntent().getExtras());
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, wifiFragment);
transaction.commit();
}else{
Log.i("MAIN_ACTIVITY", "fragment_container is NULL");
}
}
MainActivity方法：
@覆盖 public boolean onNavigationItemSelected（MenuItem item）{ //处理导航视图项目单击此处。 int id = item.getItemId（）;
onNavigationItemSelected()问题if (id == R.id.nav_settings) {
GeneralSettings generalSettings = new GeneralSettings();
Bundle args = new Bundle();
args.putInt(GeneralSettings.ARG_POSITON, 0);
generalSettings.setArguments(args);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, generalSettings);
transaction.addToBackStack(null);
int stackId = transaction.commit();
Log.i(this.getClass().getSimpleName(), "Stack ID: " + stackId);
}else if(id == R.id.nav_wlan_setting){
WifiSettings wifiSettings = new WifiSettings();
Bundle args = new Bundle();
args.putInt(GeneralSettings.ARG_POSITON, 0);
wifiSettings.setArguments(args);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, wifiSettings);
transaction.addToBackStack(null);
int stackId = transaction.commit();
Log.i(this.getClass().getSimpleName(), "Stack ID: " + stackId);
}else if(id == R.id.nav_led_settings){
UvLedSettings uvLedSettings = new UvLedSettings();
Bundle args = new Bundle();
args.putInt(GeneralSettings.ARG_POSITON,0);
uvLedSettings.setArguments(args);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, uvLedSettings);
transaction.addToBackStack(null);
int stackId = transaction.commit();
Log.i(this.getClass().getSimpleName(), "Stack ID: " + stackId);
}else if(id == R.id.nav_server_settings){
ServerSettings serverSettings = new ServerSettings();
Bundle args = new Bundle();
// TODO: Fix Args Settings for all Fragments
args.putInt(GeneralSettings.ARG_POSITON, 0);
serverSettings.setArguments(args);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, serverSettings);
transaction.addToBackStack(null);
int stackId = transaction.commit();
Log.i(this.getClass().getSimpleName(), "Stack ID: " + stackId);
} else if (id == R.id.nav_current_device) {
} else if (id == R.id.nav_available_devices){
WifiFragment wifi = new WifiFragment();
Bundle args = new Bundle();
args.putInt(GeneralSettings.ARG_POSITON, 0);
wifi.setArguments(args);
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container, wifi);
transaction.addToBackStack(null);
int stackId = transaction.commit();
Log.i(this.getClass().getSimpleName(), "Stack ID: " + stackId);
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
：
Fragment问题package com.myapp.serviceapplication.fragments;
import android.content.Context;
import android.net.wifi.ScanResult;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.RelativeLayout;
import com.myapp.serviceapplication.R;
import com.myapp.serviceapplication.adapters.WifiItemListAdapter;
import java.util.ArrayList;
/**
* A fragment representing a list of Items.
* <p>
* Activities containing this fragment MUST implement the {@link OnListFragmentInteractionListener}
* interface.
*/
public class WifiFragment extends Fragment {
// TODO: Customize parameter argument names
private static final String ARG_COLUMN_COUNT = "column-count";
// TODO: Customize parameters
private int mColumnCount = 1;
private OnListFragmentInteractionListener mListener;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public WifiFragment() {
// Required empty public constructor
}
// TODO: Customize parameter initialization
@SuppressWarnings("unused")
public static WifiFragment newInstance(int columnCount) {
WifiFragment fragment = new WifiFragment();
Bundle args = new Bundle();
args.putInt(ARG_COLUMN_COUNT, columnCount);
fragment.setArguments(args);
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mColumnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_wifi_list, container, false);
if(view instanceof RelativeLayout){
Context context = view.getContext();
RelativeLayout relativeLayout = (RelativeLayout) view;
ListView listView = (ListView) relativeLayout.findViewById(R.id.lst_wifi_items);
listView.setAdapter(new WifiItemListAdapter(this.getContext(), new ArrayList<ScanResult>()));
}
return view;
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
// TODO: This needs to be modified to the correct listener type
if (context instanceof OnListFragmentInteractionListener) {
mListener = (OnListFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnListFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnListFragmentInteractionListener {
// TODO: Update argument type and name
void onListFragmentInteraction(View item);
}
}
布局文件：
Fragment <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.WifiFragment"
>
<ListView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/lst_wifi_items"
android:background="#ffffff"/>
</RelativeLayout>
：
content_main.xml <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context=".activities.MainActivity"
tools:showIn="@layout/app_bar_main">
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/fragment_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
：
activity_main.xml我花了太多时间试图解决这个问题，但我看不出这个问题。
2 个答案:
答案 0 :(得分：4)
这是因为你的片段容器在listview之上，默认情况下如果你不在ViewGroup中使用背景（LinearLayout，RelativeLayout，...）那么那将是透明的，所以，你需要做的只是放入一个背景你的片段容器：
fragment_wifi_list.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".fragments.WifiFragment"
android:background="#ffffff"
>
...
提示：
android:clickable="true"
这可以避免并发点击问题
答案 1 :(得分：2)
将以下行添加到有问题的片段
的顶部相对布局中android:background="#ffffff"
android:clickable="true"
希望它有效。
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