ProgramsAdapter.java

package macbury.pod.adapters;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.koushikdutta.ion.Ion;


import java.util.ArrayList;
import java.util.List;

import macbury.pod.R;
import macbury.pod.db.models.Program;

/**
 * Created by macbury on 12.09.14.
 */
public class ProgramsAdapter extends BaseAdapter {
  private static final String TAG = "ProgramsAdapter";
  private final Context context;
  private final ArrayList<Program> programs;
  private final ProgramsAdapterListener listener;

  public ProgramsAdapter(Context context, List<Program> programs, ProgramsAdapterListener listener) {
    this.context  = context;
    this.listener = listener;
    this.programs = new ArrayList<Program>();
    set(programs);
  }


  public void set(List<Program> nprogs) {
    this.programs.clear();
    this.programs.addAll(nprogs);
    this.notifyDataSetChanged();
  }

  @Override
  public int getCount() {
    return programs.size();
  }

  @Override
  public Program getItem(int position) {
    return programs.get(position);
  }

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

  @Override
  public View getView(int position, View convertView, ViewGroup parent) {
    ProgramHolder holder;

    if (convertView == null) {
      holder                      = new ProgramHolder();
      LayoutInflater inflater     = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
      convertView                 = inflater.inflate(R.layout.program_grid_item, parent, false);
      holder.programPreview       = (ImageView)convertView.findViewById(R.id.program_preview);
      holder.programTitle         = (TextView)convertView.findViewById(R.id.program_title);
      holder.convertView          = convertView;

      holder.convertView.setOnTouchListener(holder);
      convertView.setTag(holder);
    } else {
      holder                      = (ProgramHolder)convertView.getTag();
    }

    Program program = getItem(position);
    holder.position = position;
    Ion.with(context).load(program.image).withBitmap().placeholder(R.drawable.placeholder).intoImageView(holder.programPreview);
    holder.programTitle.setText(program.name);
    return convertView;
  }

  public class ProgramHolder implements View.OnTouchListener {
    public ImageView programPreview;
    public TextView programTitle;
    public View convertView;
    public int position;

    @Override
    public boolean onTouch(View v, MotionEvent event) {

      switch (event.getAction()) {
        case MotionEvent.ACTION_DOWN: {
          convertView.setAlpha(0.6f);
          convertView.invalidate();
          break;
        }
        case MotionEvent.ACTION_UP:
          listener.onProgramSelect(getItem(position));
        case MotionEvent.ACTION_CANCEL: {
          convertView.setAlpha(1f);
          convertView.invalidate();
          break;
        }
      }
      return true;
    }
  }

  public interface ProgramsAdapterListener {
    public void onProgramSelect(Program program);
  }
}