Android Open Source - BuildingForAndroidTV T V Grid Fragment

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License

The source code is released under:
MIT License
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Java Source Code

package com.sgottard.tvdemoapp;
/*ww w .  j  a  va2  s  .  co m*/
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.support.v17.leanback.app.BackgroundManager;
import android.support.v17.leanback.app.VerticalGridFragment;
import android.support.v17.leanback.widget.ArrayObjectAdapter;
import android.support.v17.leanback.widget.OnItemClickedListener;
import android.support.v17.leanback.widget.OnItemSelectedListener;
import android.support.v17.leanback.widget.Row;
import android.support.v17.leanback.widget.VerticalGridPresenter;
import android.util.DisplayMetrics;

import com.squareup.picasso.Picasso;
import com.squareup.picasso.Target;

import java.net.URI;
import java.util.Timer;
import java.util.TimerTask;

/**
 * Created by Sebastiano Gottardo on 19/10/14.
 */
public class TVGridFragment extends VerticalGridFragment {

  private Drawable mDefaultBackground;
  private Target mBackgroundTarget;
  private DisplayMetrics mMetrics;
  private Timer mBackgroundTimer;
  private final Handler mHandler = new Handler();
  private URI mBackgroundURI;

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    VerticalGridPresenter presenter = new VerticalGridPresenter();
    presenter.setNumberOfColumns(3);
    setGridPresenter(presenter);

    loadRows();
  }

  private void loadRows() {
    ArrayObjectAdapter adapter = new ArrayObjectAdapter(new CardPresenter());
    adapter.addAll(0, MovieList.list);
    setAdapter(adapter);
  }

  private void prepareBackgroundManager() {
    BackgroundManager backgroundManager = BackgroundManager.getInstance(getActivity());
    backgroundManager.attach(getActivity().getWindow());
    mBackgroundTarget = new PicassoBackgroundManagerTarget(backgroundManager);

    mDefaultBackground = getResources().getDrawable(R.drawable.default_background);

    mMetrics = new DisplayMetrics();
    getActivity().getWindowManager().getDefaultDisplay().getMetrics(mMetrics);
  }

  private void setupUIElements() {
    setTitle("TVGridFragment");
  }

  private void startBackgroundTimer() {
    if (null != mBackgroundTimer) {
      mBackgroundTimer.cancel();
    }
    mBackgroundTimer = new Timer();
    mBackgroundTimer.schedule(new UpdateBackgroundTask(), 300);
  }

  protected void updateBackground(Drawable drawable) {
    BackgroundManager.getInstance(getActivity()).setDrawable(drawable);
  }

  protected void clearBackground() {
    BackgroundManager.getInstance(getActivity()).setDrawable(mDefaultBackground);
  }

  protected void updateBackground(URI uri) {
    Picasso.with(getActivity())
        .load(uri.toString())
        .resize(mMetrics.widthPixels, mMetrics.heightPixels)
        .centerInside()
        .error(mDefaultBackground)
        .into(mBackgroundTarget);
  }

  private void setupEventListeners() {
    setOnItemSelectedListener(getDefaultItemSelectedListener());
    setOnItemClickedListener(getDefaultItemClickedListener());
  }

  protected OnItemSelectedListener getDefaultItemSelectedListener() {
    return new OnItemSelectedListener() {
      @Override
      public void onItemSelected(Object item, Row row) {
        // item is selected
      }
    };
  }

  protected OnItemClickedListener getDefaultItemClickedListener() {
    return new OnItemClickedListener() {
      @Override
      public void onItemClicked(Object item, Row row) {
        Utils.showToast(getActivity(), "Item clicked");
      }
    };
  }

  /*****************
   * PRIVATE CLASSES
   *****************/

  private class UpdateBackgroundTask extends TimerTask {
    @Override
    public void run() {
      mHandler.post(new Runnable() {
        @Override
        public void run() {
          if (mBackgroundURI != null) {
            updateBackground(mBackgroundURI);
          }
        }
      });
    }
  }
}
Java Source Code List
