com.example.androidthings.doorbell.DoorbellEntryAdapter.java Source code

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Here is the source code for com.example.androidthings.doorbell.DoorbellEntryAdapter.java

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/*
 * Copyright 2016, The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.androidthings.doorbell;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.drawable.Drawable;
import android.support.v4.content.ContextCompat;
import android.support.v7.widget.RecyclerView;
import android.text.TextUtils;
import android.text.format.DateUtils;
import android.util.Base64;
import android.view.View;
import android.widget.ImageView;
import android.widget.TextView;

import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.google.firebase.database.DatabaseReference;

import java.util.ArrayList;

/**
 * RecyclerView adapter to populate doorbell entries from Firebase.
 */
public class DoorbellEntryAdapter
        extends FirebaseRecyclerAdapter<DoorbellEntry, DoorbellEntryAdapter.DoorbellEntryViewHolder> {

    /**
     * ViewHolder for each doorbell entry
     */
    public static class DoorbellEntryViewHolder extends RecyclerView.ViewHolder {

        public final ImageView image;
        public final TextView time;
        public final TextView metadata;

        public DoorbellEntryViewHolder(View itemView) {
            super(itemView);

            this.image = (ImageView) itemView.findViewById(R.id.imageView1);
            this.time = (TextView) itemView.findViewById(R.id.textView1);
            this.metadata = (TextView) itemView.findViewById(R.id.textView2);
        }
    }

    private Context mApplicationContext;

    public DoorbellEntryAdapter(Context context, DatabaseReference ref) {
        super(DoorbellEntry.class, R.layout.doorbell_entry, DoorbellEntryViewHolder.class, ref);

        mApplicationContext = context.getApplicationContext();
    }

    @Override
    protected void populateViewHolder(DoorbellEntryViewHolder viewHolder, DoorbellEntry model, int position) {
        // Display the timestamp
        CharSequence prettyTime = DateUtils.getRelativeDateTimeString(mApplicationContext, model.getTimestamp(),
                DateUtils.SECOND_IN_MILLIS, DateUtils.WEEK_IN_MILLIS, 0);
        viewHolder.time.setText(prettyTime);

        // Display the image
        if (model.getImage() != null) {
            // Decode image data encoded by the Cloud Vision library
            byte[] imageBytes = Base64.decode(model.getImage(), Base64.NO_WRAP | Base64.URL_SAFE);
            Bitmap bitmap = BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length);
            if (bitmap != null) {
                viewHolder.image.setImageBitmap(bitmap);
            } else {
                Drawable placeholder = ContextCompat.getDrawable(mApplicationContext, R.drawable.ic_image);
                viewHolder.image.setImageDrawable(placeholder);
            }
        }

        // Display the metadata
        if (model.getAnnotations() != null) {
            ArrayList<String> keywords = new ArrayList<>(model.getAnnotations().keySet());

            int limit = Math.min(keywords.size(), 3);
            viewHolder.metadata.setText(TextUtils.join("\n", keywords.subList(0, limit)));
        } else {
            viewHolder.metadata.setText("no annotations yet");
        }
    }

}