吴小龙同學

Android之LoadMoreListView

java

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/**
* Android load more ListView when scroll down.
*
* @author Charon Chui
*/
public class LoadMoreListView extends ListView {
protected static final String TAG = "LoadMoreListView";
private View mFooterView;
private OnScrollListener mOnScrollListener;
private OnLoadMoreListener mOnLoadMoreListener;
/**
* If is loading now.
*/
private boolean mIsLoading;
private int mCurrentScrollState;
public LoadMoreListView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
public LoadMoreListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public LoadMoreListView(Context context) {
super(context);
init(context);
}
private void init(Context context) {
mFooterView = View.inflate(context, R.layout.load_more_footer, null);
addFooterView(mFooterView);
hideFooterView();
/*
* Must use super.setOnScrollListener() here to avoid override when call
* this view's setOnScrollListener method
*/
super.setOnScrollListener(superOnScrollListener);
}
/**
* Hide the load more view(footer view)
*/
private void hideFooterView() {
mFooterView.setVisibility(View.GONE);
}
/**
* Show load more view
*/
private void showFooterView() {
mFooterView.setVisibility(View.VISIBLE);
}
@Override
public void setOnScrollListener(OnScrollListener l) {
mOnScrollListener = l;
}
/**
* Set load more listener, usually you should get more data here.
*
* @param listener
* OnLoadMoreListener
* @see OnLoadMoreListener
*/
public void setOnLoadMoreListener(OnLoadMoreListener listener) {
mOnLoadMoreListener = listener;
}
/**
* When complete load more data, you must use this method to hide the footer
* view, if not the footer view will be shown all the time.
*/
public void onLoadMoreComplete() {
mIsLoading = false;
hideFooterView();
}
private OnScrollListener superOnScrollListener = new OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
mCurrentScrollState = scrollState;
// Avoid override when use setOnScrollListener
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(view, scrollState);
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(view, firstVisibleItem,
visibleItemCount, totalItemCount);
}
// The count of footer view will be add to visibleItemCount also are
// added to totalItemCount
if (visibleItemCount == totalItemCount) {
// If all the item can not fill screen, we should make the
// footer view invisible.
hideFooterView();
} else if (!mIsLoading
&& (firstVisibleItem + visibleItemCount >= totalItemCount)
&& mCurrentScrollState != SCROLL_STATE_IDLE) {
showFooterView();
mIsLoading = true;
if (mOnLoadMoreListener != null) {
mOnLoadMoreListener.onLoadMore();
}
}
}
};
/**
* Interface for load more
*/
public interface OnLoadMoreListener {
/**
* Load more data.
*/
void onLoadMore();
}
`

load_more_footer.xml

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:orientation="horizontal" >
<ProgressBar
android:id="@+id/load_more_pb"
style="@android:style/Widget.ProgressBar.Small"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp" />
<TextView
android:id="@+id/load_more_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingBottom="5dp"
android:paddingTop="5dp"
android:text="正在加载..."
tools:ignore="HardcodedText" />
</LinearLayout>

调用

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mListView.setOnLoadMoreListener(new OnLoadMoreListener() {
@Override
public void onLoadMore() {
}
});


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