android - 如何将数据从 Activity 发送到其父 fragment ？-6ren

android - 如何将数据从 Activity 发送到其父 fragment ？

转载作者：塔克拉玛干更新时间：2023-11-02 20:01:59

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我有一个主要 Activity ，其中有一个带有 ImageView 的 fragment 。单击此 ImageView 时，将启动一个包含 ListView 的新 Activity 。我想返回用户点击这个 ListView 的位置(索引)，返回到 fragment 。

fragment 代码

package com.example.kedee.testgradle;


import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;


/**
 * A simple {@link Fragment} subclass.
 */
public class ASKFragment extends Fragment implements View.OnClickListener{
    private Context context;
    private View rootView;
    private int pos;

    public ASKFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        rootView= inflater.inflate(R.layout.fragment_ask, container, false);
        context=inflater.getContext();
        setListeners();
        return  rootView;
    }

    void setListeners(){
        ImageView catIcon=(ImageView)rootView.findViewById(R.id.cat_icon);
        catIcon.setOnClickListener(this);



    }

    @Override
    public void onClick(View v) {
        int vID=v.getId();
        if(vID==R.id.cat_icon){
            Intent intent=new Intent(getActivity(),ASK.class);
            getActivity().startActivity(intent);
        }

    }
}

从此 fragment 中调用的 Activity 代码。 (提问 Activity )

package com.example.kedee.testgradle;

import android.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

public class ASK extends AppCompatActivity {
    private int index;
    private String[] catNames= {"Acad","Emer","Tech","Exam","Station","Finance","Medical","Place","Sports" ,
            "Others" };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_ask);
        ListView listView=(ListView)findViewById(R.id.ask_cat_listView);
        listView.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_list_item_multiple_choice,catNames));
        listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener(){
            public void onItemClick(AdapterView<?> listView, View v, int pos, long id){
                index=pos;
                //code to return back this index to the parent fragment?
            }
        });
    }


}