LoadingFeedItemView.java

package io.github.froger.instamaterial.ui.view;

import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.annotation.TargetApi;
import android.content.Context;
import android.os.Build;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewTreeObserver;
import android.widget.FrameLayout;

import butterknife.BindView;
import butterknife.ButterKnife;
import io.github.froger.instamaterial.R;

/**
 * Created by Miroslaw Stanek on 09.12.2015.
 */
public class LoadingFeedItemView extends FrameLayout {

    @BindView(R.id.vSendingProgress)
    SendingProgressView vSendingProgress;
    @BindView(R.id.vProgressBg)
    View vProgressBg;

    private OnLoadingFinishedListener onLoadingFinishedListener;

    public LoadingFeedItemView(Context context) {
        super(context);
        init();
    }

    public LoadingFeedItemView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public LoadingFeedItemView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    @TargetApi(Build.VERSION_CODES.LOLLIPOP)
    public LoadingFeedItemView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
        super(context, attrs, defStyleAttr, defStyleRes);
        init();
    }

    private void init() {
        LayoutInflater.from(getContext()).inflate(R.layout.item_feed_loader, this, true);
        ButterKnife.bind(this);
    }

    public void startLoading() {
        vSendingProgress.getViewTreeObserver().addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
            @Override
            public boolean onPreDraw() {
                vSendingProgress.getViewTreeObserver().removeOnPreDrawListener(this);
                vSendingProgress.simulateProgress();
                return true;
            }
        });
        vSendingProgress.setOnLoadingFinishedListener(new SendingProgressView.OnLoadingFinishedListener() {
            @Override
            public void onLoadingFinished() {
                vSendingProgress.animate().scaleY(0).scaleX(0).setDuration(200).setStartDelay(100);
                vProgressBg.animate().alpha(0.f).setDuration(200).setStartDelay(100)
                        .setListener(new AnimatorListenerAdapter() {
                            @Override
                            public void onAnimationEnd(Animator animation) {
                                vSendingProgress.setScaleX(1);
                                vSendingProgress.setScaleY(1);
                                vProgressBg.setAlpha(1);
                                if (onLoadingFinishedListener != null) {
                                    onLoadingFinishedListener.onLoadingFinished();
                                    onLoadingFinishedListener = null;
                                }
                            }
                        }).start();
            }
        });
    }

    public void setOnLoadingFinishedListener(OnLoadingFinishedListener onLoadingFinishedListener) {
        this.onLoadingFinishedListener = onLoadingFinishedListener;
    }

    public interface OnLoadingFinishedListener {
        void onLoadingFinished();
    }
}