我们如何从另一个不包含该片段的类中调用一个片段？ [英] How can we call one fragment from another class that doesn't contain that fragment?

问题描述

我有一个活动类： IdeaBoxActivity
这是活动的布局代码-

 <？xml version = 1.0 encoding = utf-8？> 
< android.support.design.widget.CoordinatorLayout 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 
工具：context = com.asif047> 
 
 
< android.support.v4.widget.DrawerLayout 
 android：layout_width = match_parent 
 android：layout_height = match_parent 
 android ：id = @ + id / dl 
> 
 
< LinearLayout 
 android：id = @ + id / flcontent 
 android：layout_width = match_parent 
 android：layout_height = match_parent 
 android：orientation = vertical> 
 
< android.support.v7.widget.Toolbar 
 android：id = @ + id / toolbar_idea_box 
 android：layout_width = match_parent 
 android ：layout_height = wrap_content 
 android：background =？attr / colorPrimary 
 android：minHeight =？attr / actionBarSize 
 app：contentInsetLeft = 0dp 
应用程序：contentInsetStart = 16dp 
 app：popupTheme = @ style / ThemeOverlay.AppCompat.Light 
 app：theme = @ style / ThemeOverlay.AppCompat.Dark.ActionBar /> 
 
 
 
< android.support.design.widget.TabLayout 
 android：id = @ + id / tabs_idea 
 android：layout_width =  match_parent 
 android：layout_height = wrap_content 
 android：background =？attr / colorPrimary 
 app：tabTextColor =＃ffffff 
 /> 
 
 
< android.support.v4.view.ViewPager 
 android：id = @ + id / container_idea 
 android：layout_width = match_parent 
 android：layout_height = match_parent 
 app：layout_behavior = @ string / appbar_scrolling_view_behavior /> 
 
 
 
< / LinearLayout> 
 
< android.support.design.widget.NavigationView 
 
 android：id = @ + id / nv 
 android：layout_width = wrap_content 
 android：layout_height = match_parent 
 android：layout_gravity = start 
 android：background =＃ffffff 
 app：headerLayout = @ layout / header 
 app：itemIconTint =＃000000 
 app：itemTextColor =＃000000 
 app：menu = @ menu / drawermenu 
 
> 
 
 
< /android.support.design.widget.NavigationView> 
 
 
< /android.support.v4.widget.DrawerLayout> 
 
 
 
< /android.support.design.widget.CoordinatorLayout> 
  

我在 IdeaBoxActivity 中添加了一些片段。

我使用以下方法添加了片段-

  private void setupViewPager（ViewPager viewPager） {
 SectionPageadapter sectionPageadapter = new SectionPageadapter（getSupportFragmentManager（））; 
 sectionPageadapter.addFragment（new IdeasFragment（）， Ideas）; 
 sectionPageadapter.addFragment（new WriteIdeaFragment（），写点子）; 
 sectionPageadapter.addFragment（new MyIdeasFragment（），我的想法）； 
 
 viewPager.setAdapter（sectionPageadapter）; 
} 
  

在这些片段中，一个是： IdeasFragment p>

我还有另一个活动，名为： HappyWallActivity
在此活动中，我调用了一个适配器类，名为： RecyclerAdapterSeeAll

 公共类RecyclerAdapterSeeAll扩展了RecyclerView.Adapter< RecyclerAdapterSeeAll.MyViewHolder> {
 
私有列表< ModelHappySeeAll> ; modelHappySeeAlls; 
私有上下文上下文； 
 private int id = 0; 
 private String status =; 
 
 public RecyclerAdapterSeeAll（Context context，List< ModelHappySeeAll> modelHappySeeAlls）{
 this.modelHappySeeAlls = modelHappySeeAlls; 
 this.context =上下文； 
} 
 
 
 @Override 
 public MyViewHolder onCreateViewHolder（ViewGroup parent，int viewType）{
 View view = LayoutInflater.from（parent.getContext（） ）.inflate（R.layout.row_item_see_all，parent，false）; 
返回新的MyViewHolder（view）; 
} 
 
 @Override 
 public void onBindViewHolder（MyViewHolderholder，int position）{
 
holder.tvName.setText（modelHappySeeAlls.get（position）） .getName（））; 
holder.tvDetails.setText（modelHappySeeAlls.get（position）.getDetails（））; 
 
holder.setItemClickListener（new ItemClickListener（）{
 @Override 
 public void onItemClick（int pos）{
 
 
} 
}）; 
 
 
 
} 
 
 @Override 
 public int getItemCount（）{
 return modelHappySeeAlls.size（）; 
} 
 
 
公共类MyViewHolder扩展了RecyclerView.ViewHolder实现的View.OnClickListener {
 TextView tvName，tvDetails; 
 ItemClickListener itemClickListener; 
 
 public MyViewHolder（View itemView）{
 super（itemView）; 
 tvName = itemView.findViewById（R.id.textview_name_see_all）; 
 tvDetails = itemView.findViewById（R.id.textview_happy_post_see_all）; 
} 
 
 public void setItemClickListener（ItemClickListener itemClickListener）{
 this.itemClickListener = itemClickListener; 
 itemView.setOnClickListener（this）; 
} 
 
 @Override 
 public void onClick（View view）{
 this.itemClickListener.onItemClick（this.getLayoutPosition（））; 
} 
} 
 
} 
  

holder.setItemClickListener 内的类我想调用 IdeaBoxActivity 的 IdeasFragment 。

有什么办法吗？如果是，那么请帮助我使用应该起作用的代码。

解决方案

您必须使用相同的Ideas片段实例可能将在 new IdeasFragment（）上创建的原始实例存储到全局变量，或者在执行 new RecyclerAdapterSeeAll（IdeasFragment instance）时可以传递该实例并像这样使用它。无论哪种方式，这里的想法都是在两个类上使用相同的实例。

java中的全局变量

 公共静态IdeasFragment myInstance = new IdeasFragment（）; 
 
 private void setupViewPager（ViewPager viewPager）{
 SectionPageadapter sectionPageadapter = new 
 SectionPageadapter（getSupportFragmentManager（））; 
 sectionPageadapter.addFragment（myInstance，我的想法）; 
 
 viewPager.setAdapter（sectionPageadapter）; 
} 
  

在点击监听器上：

  public void setItemClickListener（ItemClickListener itemClickListener）{
 
 IdeaBoxActivity.myInstance.start（）; //在此处调用启动IdeasFragment所需的函数
} 
  

I am having one activity class : IdeaBoxActivity Here is the layout code of the activity-

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout 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"
    tools:context="com.asif047">


    <android.support.v4.widget.DrawerLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/dl"
        >

        <LinearLayout
            android:id="@+id/flcontent"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar_idea_box"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="?attr/colorPrimary"
                android:minHeight="?attr/actionBarSize"
                app:contentInsetLeft="0dp"
                app:contentInsetStart="16dp"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
                app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar" />



            <android.support.design.widget.TabLayout
                android:id="@+id/tabs_idea"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="?attr/colorPrimary"
                app:tabTextColor="#ffffff"
                />


        <android.support.v4.view.ViewPager
            android:id="@+id/container_idea"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:layout_behavior="@string/appbar_scrolling_view_behavior" />



        </LinearLayout>

        <android.support.design.widget.NavigationView

            android:id="@+id/nv"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_gravity="start"
            android:background="#ffffff"
            app:headerLayout="@layout/header"
            app:itemIconTint="#000000"
            app:itemTextColor="#000000"
            app:menu="@menu/drawermenu"

            >


        </android.support.design.widget.NavigationView>


    </android.support.v4.widget.DrawerLayout>



</android.support.design.widget.CoordinatorLayout>

I have added some fragments in the IdeaBoxActivity .

I have added the fragments using following method-

private void setupViewPager(ViewPager viewPager) {
    SectionPageadapter sectionPageadapter = new SectionPageadapter(getSupportFragmentManager());
    sectionPageadapter.addFragment(new IdeasFragment(), "Ideas");
    sectionPageadapter.addFragment(new WriteIdeaFragment(), "Write Idea");
    sectionPageadapter.addFragment(new MyIdeasFragment(), "My Ideas");

    viewPager.setAdapter(sectionPageadapter);
}

Among these fragments one is : IdeasFragment

I have another activity which named: HappyWallActivity From this Activity I have called one adapter class named: RecyclerAdapterSeeAll

public class RecyclerAdapterSeeAll extends RecyclerView.Adapter<RecyclerAdapterSeeAll.MyViewHolder>{

    private List<ModelHappySeeAll> modelHappySeeAlls;
    private Context context;
    private int id = 0;
    private String status = "";

    public RecyclerAdapterSeeAll( Context context, List<ModelHappySeeAll> modelHappySeeAlls) {
        this.modelHappySeeAlls = modelHappySeeAlls;
        this.context = context;
    }


    @Override
    public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_item_see_all, parent, false);
        return  new MyViewHolder(view);
    }

    @Override
    public void onBindViewHolder(MyViewHolder holder, int position) {

        holder.tvName.setText(modelHappySeeAlls.get(position).getName());
        holder.tvDetails.setText(modelHappySeeAlls.get(position).getDetails());

        holder.setItemClickListener(new ItemClickListener() {
            @Override
            public void onItemClick(int pos) {


            }
        });



    }

    @Override
    public int getItemCount() {
        return modelHappySeeAlls.size();
    }


    public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
        TextView tvName, tvDetails;
        ItemClickListener itemClickListener;

        public MyViewHolder(View itemView) {
            super(itemView);
            tvName = itemView.findViewById(R.id.textview_name_see_all);
            tvDetails = itemView.findViewById(R.id.textview_happy_post_see_all);
        }

        public void setItemClickListener ( ItemClickListener itemClickListener){
            this.itemClickListener = itemClickListener;
            itemView.setOnClickListener(this);
        }

        @Override
        public void onClick(View view) {
            this.itemClickListener.onItemClick(this.getLayoutPosition());
        }
    }

}

In this class inside holder.setItemClickListener I want to call IdeasFragment of the IdeaBoxActivity.

Is there any way of doing this? If yes, then please help me with the code that should work.

解决方案

You have to use the same instance of Ideas fragment by probably storing the original instance made on new IdeasFragment() to a global variable, or you could pass the instance when you do new RecyclerAdapterSeeAll(IdeasFragment instance) and use it like that. Either way the idea here is to use the same instances on both classes.

Globals in java

public static IdeasFragment myInstance= new IdeasFragment(); 

private void setupViewPager(ViewPager viewPager) {
    SectionPageadapter sectionPageadapter = new 
    SectionPageadapter(getSupportFragmentManager());
    sectionPageadapter.addFragment(myInstance, "My Ideas");

    viewPager.setAdapter(sectionPageadapter);
} 

And on the click listener:

public void setItemClickListener ( ItemClickListener itemClickListener){

    IdeaBoxActivity.myInstance.start(); // call the function needed to start the IdeasFragment here
}

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