CustomProgressFlipLoadingLayout.java

package com.handmark.pulltorefresh.library.internal;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.LinearInterpolator;
import android.view.animation.RotateAnimation;
import android.widget.ImageView;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
import com.handmark.pulltorefresh.library.R;

/**
 * Uses a custom icon to show loading state instead of the indetermindate ProgressBar.
 *
 * @author Will Hou (will@ezi.am)
 * @date Nov 18, 2012
 */
public class CustomProgressFlipLoadingLayout extends FlipLoadingLayout {

	private ImageView mCustomImageView;
	private Animation mSpinAnimation;

	public CustomProgressFlipLoadingLayout(Context context, final Mode mode, final Orientation scrollDirection, TypedArray attrs) {
		super(context, mode, scrollDirection, attrs);

		mSpinAnimation = new RotateAnimation(-359, 0, Animation.RELATIVE_TO_SELF, 0.5f,
				Animation.RELATIVE_TO_SELF, 0.5f);
		mSpinAnimation.setInterpolator(new LinearInterpolator());
		mSpinAnimation.setRepeatMode(Animation.INFINITE);
		mSpinAnimation.setRepeatCount(Animation.INFINITE);
		mSpinAnimation.setDuration(500);

		mCustomImageView = (ImageView) findViewById(R.id.pull_to_refresh_progress_custom);

		if (attrs.hasValue(R.styleable.PullToRefresh_ptrCustomProgressDrawable)) {
			Drawable src = attrs.getDrawable(R.styleable.PullToRefresh_ptrCustomProgressDrawable);
			mCustomImageView.setImageDrawable(src);
		} else {
			throw new IllegalArgumentException("Need to provide a custom drawable in XML to use CustomFlipLoadingLayout");
		}
	}

	@Override
	protected void refreshingImpl() {
		super.refreshingImpl();
		mHeaderProgress.setVisibility(View.GONE);
		if (mCustomImageView != null) {
			mCustomImageView.setVisibility(View.VISIBLE);
			mCustomImageView.startAnimation(mSpinAnimation);
		}
	}

	@Override
	protected void resetImpl() {
		super.resetImpl();
		mHeaderProgress.setVisibility(View.GONE);
		if (mCustomImageView != null) {
			mCustomImageView.clearAnimation();
			mCustomImageView.setVisibility(View.GONE);
		}
	}
}