在 RecyclerView 适配器中使用 onActivityResult

Question

我正在尝试在我的RecyclerViewAdapter 中使用onActivityResult。但是我得到了“方法没有从它的超类覆盖”的错误。我尝试实现接口，但 onActivityResult 永远不会被调用。我已经在 StackOverflow 问题like this one 上进行了足够多的搜索，但找不到任何有用的信息。

RecyclerViewAdapter.java

package com.example.waheed.telegramchat;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;

import java.util.List;

public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.RecyclerViewHolder> {
    //String arrays to store user data
    static String[] contact_name, Phone_no, user_id;
    Context context;

    public RecyclerAdapter(String[] contact_name, String[] Phone_no, String[] user_id, Context context) {

        //Getting the data from MainActivity.java
        this.context = context;
        this.user_id = user_id;
        this.contact_name = contact_name;
        this.Phone_no = Phone_no;
    }

    @NonNull
    @Override
    public RecyclerAdapter.RecyclerViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        //Setting the row layout for Recyclerview
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_layout, parent, false);
        RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view, this.context);

        return recyclerViewHolder;
    }

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


        holder.tx_contact.setText(contact_name[position]);
        holder.tx_phone.setText(Phone_no[position]);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    @Override
    public int getItemCount() {
        return contact_name.length;

    }

    public static class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {


        Context context;
        TextView tx_contact, tx_phone;
        ImageButton message_btn;
        static ImageView img_profile;

        public RecyclerViewHolder(View itemView, Context context) {
            super(itemView);
            tx_contact = (TextView) itemView.findViewById(R.id.txt_contactname);
            tx_phone = (TextView) itemView.findViewById(R.id.phonenumber);
            message_btn = (ImageButton) itemView.findViewById(R.id.chat_icon);
            img_profile = (ImageView) itemView.findViewById(R.id.profile_pic);
            this.context = context;
            //Calling onclick function
            message_btn.setOnClickListener(this);
            img_profile.setOnClickListener(this);

        }

        public void makeCall(String ID, String name, String packageName, String className) {

            //
            String data = "content://com.android.contacts/data/" + ID;
            // Build the intent
            Intent intent = new Intent();
            intent.setAction(Intent.ACTION_VIEW);
            // the _ids you save goes here at the end of /data/id
            intent.setData(Uri.parse("content://com.android.contacts/data/" + ID));
            intent.setDataAndType(Uri.parse(data), className);
            intent.setPackage(packageName);
            // Verify it resolves
            PackageManager packageManager = context.getPackageManager();
            List<ResolveInfo> activities = packageManager.queryIntentActivities(intent, 0);
            boolean isIntentSafe = activities.size() > 0;
            Log.d("See this " + ID, activities.size() + "");
            // Start an activity if it's safe
            if (isIntentSafe) {
                try {
                    //Toast to show which user is being called
                    context.startActivity(intent);
                    Toast.makeText(context, "Opening chat with " + name + " on Telegram", Toast.LENGTH_SHORT).show();
                } catch (Exception e) {
                    Toast.makeText(context, "OOPS!,Something went wrong\nPlease grant app permissions in setting or send feedback.", Toast.LENGTH_LONG).show();
                }
            }

        }

        @Override
        public void onClick(View v) {

            //Getting the position of the item clicked
            int i = getAdapterPosition();
            //Storing the selected items in Strings
            String name = RecyclerAdapter.contact_name[i];
            String phone = RecyclerAdapter.Phone_no[i];
            String ID = RecyclerAdapter.user_id[i];
            String mimeType = "vnd.android.cursor.item/vnd.org.telegram.messenger.android.profile";


            String packageName = "org.telegram.messenger";

            switch (v.getId()) {
                case R.id.chat_icon:
                    makeCall(ID, name, packageName, mimeType);
                    break;
                case R.id.profile_pic:
                    Intent intent = new Intent(this.context, showImages.class);
                    ((Activity) context).startActivityForResult(intent, 1);
                    break;

            }
        }

        @Override
        public void onActivityResult(int requestCode, int resultCode, Intent data) {
            Bitmap bitmap;
            if (requestCode == 1) {
                if (resultCode == showImages.RESULT_OK) {
                    String result = data.getStringExtra("result");
                    Toast.makeText(this.context, "Clicked item is " + result, Toast.LENGTH_SHORT).show();
                    bitmap = BitmapFactory.decodeFile(result);
                    RecyclerViewHolder.img_profile.setImageBitmap(bitmap);
                }
                if (resultCode == showImages.RESULT_CANCELED) {
                    //Write your code if there's no result
                }
            }
        }

    }
}

showImages.java

package com.example.waheed.telegramchat;

import android.content.Intent;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.GridView;

import com.ImageAdapter;

import java.io.File;
import java.util.ArrayList;

public class showImages extends AppCompatActivity {

    ImageAdapter myImageAdapter;
    GridView gridView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_show_images);
        gridView = (GridView) findViewById(R.id.gridview);
        myImageAdapter = new ImageAdapter(this);
        gridView.setAdapter(myImageAdapter);

        String ExternalStorageDirectoryPath = Environment
                .getExternalStorageDirectory()
                .getAbsolutePath();

        String targetPath = ExternalStorageDirectoryPath + "/Android/data/org.telegram.messenger/cache/";

        File targetDirector = new File(targetPath);

        final ArrayList<String> imagePaths = new ArrayList<String>();
        final File[] files = targetDirector.listFiles();
        for (File file : files) {
            if (file.getName().toLowerCase().endsWith(".jpg") ||
                    file.getName().toLowerCase().endsWith(".png")) {
                imagePaths.add(file.getAbsolutePath());
                myImageAdapter.add(file.getAbsolutePath());
            }
        }

        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                String result = imagePaths.get(position);
                Intent returnIntent = new Intent();
                returnIntent.putExtra("result", result);
                setResult(showImages.RESULT_OK, returnIntent);
                finish();
            }
        });
    }
}

Answer 1

RecyclerView.ViewHolder 类不包含它可以覆盖的 onActivityResult 方法的定义。

onActivityResult，据我了解，仅作为Activity & Fragment 类的方法出现。

移动代码

@Override
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    Bitmap bitmap;
    if (requestCode == 1) {
        if (resultCode == showImages.RESULT_OK) {
            String result = data.getStringExtra("result");
            Toast.makeText(this.context, "Clicked item is " + result, Toast.LENGTH_SHORT).show();
            bitmap = BitmapFactory.decodeFile(result);
            RecyclerViewHolder.img_profile.setImageBitmap(bitmap);
        }
        if (resultCode == showImages.RESULT_CANCELED) {
            //Write your code if there's no result
        }
    }
}

到发起对showImages 的调用的类。我注意到showImages 在单击项目时关闭。

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        String result = imagePaths.get(position);
        Intent returnIntent = new Intent();
        returnIntent.putExtra("result", result);
        setResult(showImages.RESULT_OK, returnIntent);
        finish();
    }
});

Answer 2

您必须在您的活动中覆盖 onActivityResult，其中包含不在 viewholder 类中的 recyclerview

Answer 3

您必须在活动类中实现onActivityResult，而不是在 RecyclerViewAdapter 中。此方法用于从您的活动中检索从您的活动开始且通常正常的其他意图/活动的数据 它在 RecyclerViewAdapter 中没有位置。

Answer 4

你应该在活动中使用onActivityForResult，并创建接口来处理动作，逻辑-适配器只显示视图。