上拉加载,下拉刷新的列表控件,大家一定都封装过,或者使用过
源代码,我会在最后贴出来
这篇代码主要是为了解决两个问题
1.滑动冲突得问题
2.listview无数据时,无数据布局的展示问题
下方列出的代码,主要就是为了解决listview与父布局之间的滑动冲突
mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
private boolean mIsEnd = false;
@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(view, scrollState);
}
if (scrollState == SCROLL_STATE_IDLE) {
//1:到达底部 2:底部当前可以加载更多 3:顶部不在刷新中状态
Log.i("syntapp", mIsEnd + "===" + mLoadMoreStatus + "====" + isRefreshing());
if (mIsEnd && mLoadMoreStatus == LoadMoreStatus.CLICK_TO_LOAD && !isRefreshing()) {
setLoadMoreStatus(LoadMoreStatus.LOADING);
if (mLoadMoreStatus != null) {
mOnLoadListener.onLoad(false);
}
}
}
}
@Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(view, firstVisibleItem, visibleItemCount, totalItemCount);
}
mIsEnd = firstVisibleItem + visibleItemCount >= totalItemCount - 1;
if (mOnMyScrollListener != null) {
mOnMyScrollListener.onScrollItem(firstVisibleItem, visibleItemCount, totalItemCount);
}
}
});
super.setOnRefreshListener(new OnRefreshListener() {
@Override
public void onRefresh() {
if (mLoadMoreStatus != LoadMoreStatus.LOADING) {
if (mOnLoadListener != null) {
mOnLoadListener.onLoad(true);
// mEmptyView.setVisibility(GONE);
}
} else {
SimpleListView.super.setRefreshing(false);
}
}
});
那么接下来我们来解决listView的恐怖剧展示问题
//1.我们需要添加一个空布局的显示,这里的activity_no_data可以根据自己的实际需要去设计
mEmptyView = LayoutInflater.from(context).inflate(R.layout.activity_no_data, null);
mListView = new ListView(context, attrs);
FrameLayout rl = new FrameLayout(context);
rl.addView(mEmptyView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
rl.addView(mListView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
addView(rl);
//2.我们需要解决listview在上拉加载和下拉刷新的触摸事件,让我们想要的的触摸极致点位与代码上的判断重合
mListView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE) {
if (mListView.getChildAt(0) != null && mListView.getFirstVisiblePosition() == 0 &&
mListView.getChildAt(0).getTop() >= 0) {//或者 listView.getChildAt(0).getTop() >= listView.getListPaddingTop())
((ViewGroup) ((ViewGroup) mListView.getParent()).getParent()).setEnabled(true);
Log.d("TAG", "reach top!!!");
} else {
if (mListView.getAdapter().getCount() == 0) {
((ViewGroup) ((ViewGroup) mListView.getParent()).getParent()).setEnabled(true);
} else {
((ViewGroup) ((ViewGroup) mListView.getParent()).getParent()).setEnabled(false);
}
Log.d("TAG", "not reach top!!!");
}
}
return false;
}
});
接下来,我贴出来全部的代码段,当然了,这里面还是有很多无用的代码段,根据自己的实际需求去增删吧
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.DataSetObserver;
import android.os.Parcelable;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.LayoutInflater;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import com.avicsafety.lib.R;
public class SimpleListView extends SwipeRefreshLayout {
private ListView mListView;
private LoadMoreStatus mLoadMoreStatus = LoadMoreStatus.CLICK_TO_LOAD;
private OnLoadListener mOnLoadListener;
private OnMyScrollListener mOnMyScrollListener;
private TextView mLoadMoreView;
private AbsListView.OnScrollListener mOnScrollListener;
private View mEmptyView;
private ListAdapter mAdapter;
private float startY;
private float startX;
// 记录viewPager是否拖拽的标记
private boolean mIsVpDragger;
private int mTouchSlop;
/**
* 加载更多状态
*/
public enum LoadMoreStatus {
/**
* 点击加载更多
*/
CLICK_TO_LOAD,
/**
* 正在加载
*/
LOADING,
/**
* 没有更多内容了
*/
LOADED_ALL
}
/**
* 加载监听器
*/
public interface OnLoadListener {
/**
* 下来刷新或者加载更多时触发该回调
*
* @param isRefresh true为下拉刷新 false为加载更多
*/
void onLoad(boolean isRefresh);
}
public interface OnMyScrollListener {
void onScrollItem(int firstVisibleItem, int visibleItemCount, int totalItemCount);
}
public SimpleListView(Context context) {
super(context);
init(context, null);
mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop();
}
public SimpleListView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context, attrs);
}
private void init(Context context, AttributeSet attrs) {
mEmptyView = LayoutInflater.from(context).inflate(R.layout.activity_no_data, null);
emptyView = mEmptyView;
mListView = new ListView(context, attrs);
FrameLayout rl = new FrameLayout(context);
rl.addView(mEmptyView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
rl.addView(mListView, new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT