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57 changes: 50 additions & 7 deletions
57
app/src/main/java/tech/salroid/filmy/customs/RecyclerviewEndlessScrollListener.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,72 +1,115 @@ | ||
| package tech.salroid.filmy.customs; | ||
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| import android.support.v7.widget.GridLayoutManager; | ||
| import android.support.v7.widget.LinearLayoutManager; | ||
| import android.support.v7.widget.RecyclerView; | ||
| import android.support.v7.widget.StaggeredGridLayoutManager; | ||
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| public abstract class RecyclerviewEndlessScrollListener extends RecyclerView.OnScrollListener { | ||
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| // The minimum amount of items to have below your current scroll position | ||
| // before loading more. | ||
| private int visibleThreshold = 5; | ||
| // The current offset index of data you have loaded | ||
| private int currentPage = 0; | ||
| // The total number of items in the dataset after the last load | ||
| private int previousTotalItemCount = 0; | ||
| // True if we are still waiting for the last set of data to load. | ||
| private boolean loading = true; | ||
| // Sets the starting page index | ||
| private int startingPageIndex = 0; | ||
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| RecyclerView.LayoutManager mLayoutManager; | ||
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| public RecyclerviewEndlessScrollListener(StaggeredGridLayoutManager layoutManager) { | ||
| public RecyclerviewEndlessScrollListener(LinearLayoutManager layoutManager) { | ||
| this.mLayoutManager = layoutManager; | ||
| } | ||
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| public int getLastVisibleItem(int[] lastVisibleItemPositions) { | ||
| public RecyclerviewEndlessScrollListener(GridLayoutManager layoutManager) { | ||
| this.mLayoutManager = layoutManager; | ||
| visibleThreshold = 2; | ||
| } | ||
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| protected RecyclerviewEndlessScrollListener(StaggeredGridLayoutManager layoutManager) { | ||
| this.mLayoutManager = layoutManager; | ||
| visibleThreshold = visibleThreshold * layoutManager.getSpanCount(); | ||
| } | ||
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| private int getLastVisibleItem(int[] lastVisibleItemPositions) { | ||
| int maxSize = 0; | ||
| for (int i = 0; i < lastVisibleItemPositions.length; i++) { | ||
| if (i == 0) { | ||
| maxSize = lastVisibleItemPositions[i]; | ||
| } | ||
| else if (lastVisibleItemPositions[i] > maxSize) { | ||
| } else if (lastVisibleItemPositions[i] > maxSize) { | ||
| maxSize = lastVisibleItemPositions[i]; | ||
| } | ||
| } | ||
| return maxSize; | ||
| } | ||
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| // This happens many times a second during a scroll, so be wary of the code you place here. | ||
| // We are given a few useful parameters to help us work out if we need to load some more data, | ||
| // but first we check if we are waiting for the previous load to finish. | ||
| @Override | ||
| public void onScrolled(RecyclerView view, int dx, int dy) { | ||
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| //Log.d("", "onScrolled: "+dx+" "+dy); | ||
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| int lastVisibleItemPosition = 0; | ||
| int totalItemCount = mLayoutManager.getItemCount(); | ||
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| if (mLayoutManager instanceof LinearLayoutManager) { | ||
| lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition(); | ||
| if (mLayoutManager instanceof StaggeredGridLayoutManager) { | ||
| int[] lastVisibleItemPositions = ((StaggeredGridLayoutManager) mLayoutManager).findLastVisibleItemPositions(null); | ||
| // get maximum element within the list | ||
| lastVisibleItemPosition = getLastVisibleItem(lastVisibleItemPositions); | ||
| } else if (mLayoutManager instanceof GridLayoutManager) { | ||
| lastVisibleItemPosition = ((GridLayoutManager) mLayoutManager).findLastVisibleItemPosition(); | ||
| } else if (mLayoutManager instanceof LinearLayoutManager) { | ||
| lastVisibleItemPosition = ((LinearLayoutManager) mLayoutManager).findLastVisibleItemPosition(); | ||
| } | ||
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| // If the total item count is zero and the previous isn't, assume the | ||
| // list is invalidated and should be reset back to initial state | ||
| if (totalItemCount < previousTotalItemCount) { | ||
| this.currentPage = this.startingPageIndex; | ||
| this.previousTotalItemCount = totalItemCount; | ||
| if (totalItemCount == 0) { | ||
| this.loading = true; | ||
| } | ||
| } | ||
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| // If it’s still loading, we check to see if the dataset count has | ||
| // changed, if so we conclude it has finished loading and update the current page | ||
| // number and total item count. | ||
| if (loading && (totalItemCount > previousTotalItemCount)) { | ||
| loading = false; | ||
| previousTotalItemCount = totalItemCount; | ||
| } | ||
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| // If it isn’t currently loading, we check to see if we have breached | ||
| // the visibleThreshold and need to reload more data. | ||
| // If we do need to reload some more data, we execute onLoadMore to fetch the data. | ||
| // threshold should reflect how many total columns there are too | ||
| if (!loading && (lastVisibleItemPosition + visibleThreshold) > totalItemCount) { | ||
| currentPage++; | ||
| onLoadMore(currentPage, totalItemCount, view); | ||
| loading = true; | ||
| } | ||
| } | ||
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| // Call this method whenever performing new searches | ||
| public void resetState() { | ||
| this.currentPage = this.startingPageIndex; | ||
| this.previousTotalItemCount = 0; | ||
| this.loading = true; | ||
| } | ||
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| public void setCurrentPage(int page) { | ||
| this.currentPage = page; | ||
| } | ||
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| // Defines the process for actually loading more data based on page | ||
| public abstract void onLoadMore(int page, int totalItemsCount, RecyclerView view); | ||
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| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,6 +1,6 @@ | ||
| #Fri Jun 23 08:30:12 IST 2017 | ||
| #Tue Oct 10 22:17:55 IST 2017 | ||
| distributionBase=GRADLE_USER_HOME | ||
| distributionPath=wrapper/dists | ||
| zipStoreBase=GRADLE_USER_HOME | ||
| zipStorePath=wrapper/dists | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-3.4.1-all.zip | ||
| distributionUrl=https\://services.gradle.org/distributions/gradle-4.1-all.zip |