如何在 ArrayAdapter 中调用 getSupportFragmentManager()

Posted 2023-04-15

【中文标题】如何在 ArrayAdapter 中调用 getSupportFragmentManager()

【英文标题】：How to call getSupportFragmentManager() in ArrayAdapter

【发布时间】：2017-07-06 20:01:45

【问题描述】：

无法在此代码中从 CustomAdapter 和 setArguments(bundle) 调用 getSupportFragmentManager() 并在另一个片段中使用它。我无法在我的代码中解决这两种方法。我如何调用这些方法。请有人尝试帮助我

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;

public class CustomGridViewAdapter extends ArrayAdapter<CategoryPost> 
    private Context context;
    private int layoutResourceId;
    private ArrayList<CategoryPost> data = new ArrayList<CategoryPost>();
    private Fragment getquoteFrag;

    public CustomGridViewAdapter(Context context, int resource, ArrayList<CategoryPost> objects) 
        super(context, resource, objects);
        this.layoutResourceId = resource;
        this.context = context;
        this.data = objects;
    

    static class ViewHolder 
        TextView success, message, id, name;
    

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) 
        final ViewHolder holder;
        if (convertView == null)
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(layoutResourceId, parent, false);
            holder.id = (TextView)convertView.findViewById(R.id.tv_data_id);
            holder.name = (TextView)convertView.findViewById(R.id.tv_name_id);
            convertView.setTag(holder);
        
        else 
            holder = (ViewHolder) convertView.getTag();
        
        final CategoryPost post = data.get(position);
        holder.name.setText(post.getName());
        holder.name.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                Bundle bundle = new Bundle();
                getquoteFrag = new GetQuoteFragment();
                FragmentManager quote_fm = getSupportFragmentManager().beginTransaction();;
                FragmentTransaction quote_ft = quote_fm.beginTransaction();
                bundle.putString("pos", String.valueOf(post.getId()));
                quote_fm.setArguments(bundle);
            
        );
        return convertView;
    

【问题讨论】：

getSupportFragmentManager 是 FragmentActivity 的成员 ...所以很明显，如果你想调用它，你需要引用此类的实例

@Selvin 我仍然无法解决它。

为什么在适配器中需要它？

【参考方案1】：

试试下面的代码：

import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
public class CustomGridViewAdapter extends ArrayAdapter<CategoryPost> 
    private Context context;
    private int layoutResourceId;
    private ArrayList<CategoryPost> data = new ArrayList<CategoryPost>();
    private Fragment getquoteFrag;
    public CustomGridViewAdapter(Context context, int resource, ArrayList<CategoryPost> objects) 
        super(context, resource, objects);
        this.layoutResourceId = resource;
        this.context = context;
        this.data = objects;
    
    static class ViewHolder
    
        TextView success, message, id, name;
    
    @Override
    public View getView(final int position, View convertView, ViewGroup parent) 
        final ViewHolder holder;
        if (convertView == null)
            holder = new ViewHolder();
            convertView = LayoutInflater.from(context).inflate(layoutResourceId, parent, false);
            holder.id = (TextView)convertView.findViewById(R.id.tv_data_id);
            holder.name = (TextView)convertView.findViewById(R.id.tv_name_id);
            convertView.setTag(holder);
        
        else 
            holder = (ViewHolder) convertView.getTag();
        
        final CategoryPost post = data.get(position);
        holder.name.setText(post.getName());
        holder.name.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View v) 
                Bundle bundle = new Bundle();
                getquoteFrag = new GetQuoteFragment();
                FragmentManager quote_fm = ((MainActivity)context).getSupportFragmentManager().beginTransaction();;
                FragmentTransaction quote_ft = quote_fm.beginTransaction();
                bundle.putString("pos", String.valueOf(post.getId()));
                getquoteFrag.setArguments(bundle);
                quote_ft.replace(R.id.container,getquoteFrag)
                quote_ft.commit();

            
        );
        return convertView;
    

【讨论】：

不兼容的类型FragmentManager quote_fm = ((MainActivity)context).getSupportFragmentManager().beginTransaction(); 并且无法解析方法quote_fm.setArguments(bundle);

@MukeshPrajapati 你需要使用片段对象 getquoteFrag.setArguments(bundle);

【参考方案2】：

这样称呼

FragmentManager quote_fm = context.getSupportFragmentManager().beginTransaction();

或

FragmentManager quote_fm = ((MainActivity)context).getSupportFragmentManager().beginTransaction();

开始片段所需的代码是

            Bundle bundle = new Bundle();
            getquoteFrag = new GetQuoteFragment();
            FragmentManager quote_fm = ((MainActivity)context).getSupportFragmentManager().beginTransaction();;
            FragmentTransaction quote_ft = quote_fm.beginTransaction();
            bundle.putString("pos", String.valueOf(post.getId()));  // you can also send this value as an integer type
            getquoteFrag.setArguments(bundle);
            quote_ft.replace(R.id.your_main_activity_container, getquoteFrag)
            quote_ft.commit();

对于下面的问题，在调用它时获取另一个片段中的值。

  @Override
public void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    if (getArguments() != null) 
        String post_id= getArguments().getString("pos");

       // you can also pass values in int type.
       int pos = getArguments().getInt("pos"); 
    

【讨论】：

我无法得到它。实际上，我想将post.getId() 值存储在bundle 对象中，并在GetQuoteFragment 片段中获取该值。

这是不同的问题？

否，但添加FragmentManager quote_fm = ((GetQuoteFragment)context).getSupportFragmentManager().beginTransaction(); 行后我仍然无法解决它。然后我想在这个方法中获取捆绑值quote_ft.setArguments(bundle);.

@MukeshPrajapati 您可以检查如何在片段传递中获取值

@Override public void onCreate(Bundle savedInstanceState) super.onCreate(savedInstanceState); if (getArguments() != null) String post_id= getArguments().getString("pos"); // you can also pass values in int type. int pos = getArguments().getInt("pos"); 它正在工作。非常感谢您宝贵的时间。