Android：使用片段交易获取白色屏幕 [英] Android: Getting white screen with fragment transaction

问题描述

我正在制作一个新闻应用程序，其中包含一个片段，用于保存列表中的所有新闻以及另一个包含视频列表的片段。当你触摸一个新的时候，它会调用一个名为openNewsCont的活动来替换当前片段的方法。

我遇到的问题是当我打电话给那个方法我得到一个空白屏幕，我看了很多其他的代码，但我找不到解决我的问题。

这是我从MainActivity调用的方法。 java

  public void openNewsCont（String text）{
 
 android。 support.v4.app.FragmentManager fm = getSupportFragmentManager（）; 
 android.support.v4.app.FragmentTransaction ft = fm.beginTransaction（）; 
 ft.replace（R.id.pager，new NewsContent（））; 
 ft.addToBackStack（null）; 
 ft.commit（）; 
 fm.executePendingTransactions（）; 
} 
  

这是Tab1.java，它包含消息并从MainActivity.java

package com.example.link_test;

导入android.os.Bundle;
导入android.support.v4.app.Fragment;
导入android.view.LayoutInflater;
导入android.view.View;
导入android.view.View.OnClickListener;
导入android.view.ViewGroup;
导入android.widget.LinearLayout;

public class Tab1 extends Fragment {

public View onCreateView（LayoutInflater inflater，ViewGroup container，
Bundle savedInstanceState）{

final View android = inflater.inflate（R.layout.tab1，container，false）;
LinearLayout newLink =（LinearLayout）android.findViewById（R.id.news1）;
newLink.setOnClickListener（new OnClickListener（）{

@Override
public void onClick（View v）{
String text =Text from fragment;
MainActivity ma =（MainActivity）getActivity（）;
ma.openNewsCont（text）;
}
}）;

return android;




这里是应该调用的片段并显示一个空白的屏幕NewsContent.java

  package com.example.link_test; 
 
导入android.os.Bundle; 
导入android.support.v4.app.Fragment; 
导入android.view.LayoutInflater; 
导入android.view.View; 
导入android.view.ViewGroup; 
 
公共类NewsContent延伸片段{
 @覆盖
公共视图onCreateView（LayoutInflater充气，ViewGroup中的容器中，
捆绑savedInstanceState）{
视图视图=充气.inflate（R.layout.news_content，container，false）; 
返回视图; 
} 
} 
  

解决方案

replace片段为：

 片段feeddetailFragment = new FeedDetailFragment（）; 
 feedFragment.getFragmentManager（）的BeginTransaction（）
 .replace（R.id.frame_container，feeddetailFragment，Constant.FRAGMENT_FEEDDETAIL）
 .addToBackStack（空）
 .commit（）; 
  

这会起作用..

如果仍然无法正常工作，然后尝试检查您要在替换后显示的片段，以确定该片段的视图是否为空

  if （view！= null）{
 ViewGroup parent =（ViewGroup）view.getParent（）; 
 if（parent！= null）
 parent.removeView（view）; 
} 
尝试{
 
 view = inflater.inflate（R.layout.fragment_business_details，
 container，false）; 
 
 initializeViewObjects（）; 
 setListeners（）; 
 
} catch（InflateException e）{
 
 return view; 
} 
 
返回视图; 
} 
  

I am making a news app where I have a fragment that holds all the news in a list and another fragment that have videos list. When you touch a new it will call a method from the activity named openNewsCont that will replace the current fragment with another one.

The proble I am having is when I call that method I get a blank screen, I have looked many other codes but I couldn't find the solution for my problem.

Here is the method I call from the MainActivity.java

public void openNewsCont(String text) {

    android.support.v4.app.FragmentManager fm = getSupportFragmentManager();
    android.support.v4.app.FragmentTransaction ft = fm.beginTransaction();
    ft.replace(R.id.pager, new NewsContent() );
    ft.addToBackStack(null);
    ft.commit();
    fm.executePendingTransactions();
 }

Here is the Tab1.java that hold the news and calls the method from the MainActivity.java

package com.example.link_test;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.widget.LinearLayout;

    public class Tab1 extends Fragment {

          public View onCreateView(LayoutInflater inflater, ViewGroup container,
                  Bundle savedInstanceState) {

              final View android = inflater.inflate(R.layout.tab1, container, false);             
              LinearLayout newLink = (LinearLayout) android.findViewById(R.id.news1);
              newLink.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    String text = "Text from fragment";
                    MainActivity ma = (MainActivity) getActivity();
                    ma.openNewsCont(text);
                }
                });

              return android;
    } 
}

And here is the fragment that should be called and shows a blank screen NewsContent.java

package com.example.link_test;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public class NewsContent extends Fragment {
      @Override
      public View onCreateView(LayoutInflater inflater, ViewGroup container,
              Bundle savedInstanceState) {
            View view = inflater.inflate(R.layout.news_content, container, false);
            return view;
    }
}

解决方案

replace fragment as:

    Fragment feeddetailFragment = new FeedDetailFragment();
feedFragment.getFragmentManager().beginTransaction()
.replace(R.id.frame_container, feeddetailFragment,Constant.FRAGMENT_FEEDDETAIL)
.addToBackStack(null)
.commit();

It will work..

If Still not working then try to check in the fragment which you want to show after replacement whether that fragment's view is null or not

if (view != null) {
        ViewGroup parent = (ViewGroup) view.getParent();
        if (parent != null)
            parent.removeView(view);
    }
    try {

        view = inflater.inflate(R.layout.fragment_business_details,
                container, false);

        initializeViewObjects();
        setListeners();

    } catch (InflateException e) {

        return view;
    }

    return view;
}

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