在 RecyclerView Adapter 中使用 onActivityResult

Question

我正在尝试在 RecyclerViewAdapter 中使用 onActivityResult。但是我得到 'The method does not override from its superclass' 的错误。我尝试实现接口，但 onActivityResult 从未被调用。我已经对 Whosebug 问题进行了充分的搜索 like this one，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

您必须覆盖 activity 中的 onActivityResult，它包含不在 viewholder 中的 recyclerview class

Answer 2

您必须在 activity class 而不是 RecyclerViewAdapter 中实施 onActivityResult。您的 activity 使用此方法从其他 intents/activities 检索数据，这些数据从您的 activity 开始并且通常它在 RecyclerViewAdapter 中没有位置。

Answer 3

RecyclerView.ViewHolder class 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 classes 的一种方法出现。

移码

@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
        }
    }
}

发送给发起对 showImages 的调用的 class。我注意到单击项目时 showImages 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 4

您应该在 activity 中使用 onActivityForResult，并创建接口来处理操作、逻辑 - 适配器仅显示视图。

在 RecyclerView Adapter 中使用 onActivityResult

Use onActivityResult in RecyclerViewAdapter

java

android

onactivityresult

android-recyclerview