Folyd

public class LoadMoreView extends LinearLayout {
    private TextView mTipText;
    private ProgressBar mProgressBar;

    private boolean mIsLoading;
    private boolean mIsDone;

    private int mLimit = 20;
    private String mCursor = null;
    private int mPage = 1;

Folyd

public class Utils {
    /**
     * To record the user click time.
     */
    private static long sLastClickTime = 0L;

    /**
     * Get device unique identify.
     *
     * @param context

Folyd

import android.os.AsyncTask;
import android.text.TextUtils;
import android.util.Log;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

Folyd

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.support.annotation.NonNull;
import android.util.AttributeSet;
import android.view.View;

Folyd

import android.os.Handler;

/**
 * A helper class can toggle target object visibility automatically.
 * It is very useful for MediaController (or ActionBar) when play video in Activity.
 */
public abstract class ToggleVisibilityHelper {

    /**
     * Record the time while user lasted click.

Folyd

import android.content.Context;
import android.util.AttributeSet;
import android.widget.GridView;

/**
 * A custom GridView which can wrap content.
 */
public class WrapGridView extends GridView {

    public WrapGridView(Context context) {

Folyd

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.support.v4.view.ViewPager;
import android.util.AttributeSet;
import android.view.MotionEvent;

import com.folyd.app.R;

public class NonSwipeableViewPager extends ViewPager {

Folyd

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.util.AttributeSet;
import android.view.View;

import com.theonepiano.smartpiano.R;

Folyd

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;

import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class SimpleBitmapAsyncTask extends AsyncTask<String, Void, Bitmap> {

Folyd

import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;

public abstract class OnLastItemVisibleListener implements AbsListView.OnScrollListener {
    private boolean mLastItemVisible = false;

    @Override
    public void onScrollStateChanged(AbsListView view, int scrollState) {
        /**
         * Check that the scrolling has stopped, and that the last item is