Android--HorizontalListView实现横向滑动
原理：继承AdapterView
效果图：
下面看源码：
这是Activity的布局文件:activity_main.xml
横向listview的每个item的布局
month_seltctor.xml
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主程序:MainActivity.java
public class meterRateActivity extends Activity {
private final static String TAG = meterRateActivity.class.getName();
private meterrateAdapter mMeterrateAdapter;
private HorizontalListViewAdapter hListViewAdapter;
private View olderSelectView = null;
@BindView(R.id.iv_return)
ImageView ivReturn;
@BindView(R.id.sp_year)
Spinner spYear;
@BindView(R.id.tv_total)
TextView tvTotal;
@BindView(R.id.tv_reality)
TextView tvReality;
@BindView(R.id.tv_incomplete)
TextView tvIncomplete;
@BindView(R.id.tv_rate)
TextView tvRate;
@BindView(R.id.rv_workrate)
RecyclerView rvWorkrate;
@BindView(R.id.hl_month)
HorizontalListView hlMonth;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_meterrate);
ButterKnife.bind(this);
initData();
}
private void initData() {
//years
List years = new ArrayList<>();
int year = Integer.parseInt(timeUtils.getyear());
for (int i = year - 10; i <= year + 10; i++) {
years.add(i);
}
ArrayAdapter adapter = new ArrayAdapter<>(meterRateActivity.this,
android.R.layout.simple_list_item_1, years);
spYear.setAdapter(adapter);
int position = adapter.getPosition(year);
spYear.setSelection(position, true);
//months
String[] months = {"1月","2月","3月","4月","5月","6月","7月","8月","9月","10月","11月","12月"};
hListViewAdapter = new HorizontalListViewAdapter(getApplicationContext(),months);
hlMonth.setAdapter(hListViewAdapter);
hlMonth.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
hListViewAdapter.setSelectIndex(position);
hListViewAdapter.notifyDataSetChanged();
}
});
}
@OnClick({R.id.iv_return, R.id.tv_total, R.id.tv_reality, R.id.tv_incomplete, R.id.tv_rate})
public void onViewClicked(View view) {
switch (view.getId()) {
case R.id.iv_return:
startActivity(new Intent(meterRateActivity.this, HomeActivity.class));
finish();
break;
case R.id.tv_total:
break;
case R.id.tv_reality:
break;
case R.id.tv_incomplete:
break;
case R.id.tv_rate:
break;
}
}
} HorizontalListView.java 这就是自定义的横向listview
package view;
import java.util.LinkedList;
import java.util.Queue;
import android.content.Context;
import android.database.DataSetObserver;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.GestureDetector;
import android.view.GestureDetector.OnGestureListener;
import android.view.MotionEvent;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.Scroller;
/**
* Created by Administrator on 2019/5/23
*
* desc:横向滑动
*/
public class HorizontalListView extends AdapterView{
public boolean mAlwaysOverrideTouch = true;
protected ListAdapter mAdapter;
private int mLeftViewIndex = -1;
private int mRightViewIndex = 0;
protected int mCurrentX;
protected int mNextX;
private int mMaxX = Integer.MAX_VALUE;
private int mDisplayOffset = 0;
protected Scroller mScroller;
private GestureDetector mGesture;
private Queue mRemovedViewQueue = new LinkedList();
private OnItemSelectedListener mOnItemSelected;
private OnItemClickListener mOnItemClicked;
private OnItemLongClickListener mOnItemLongClicked;
private boolean mDataChanged = false;
public HorizontalListView(Context context, AttributeSet attrs) {
super(context, attrs);
initView();
}
private synchronized void initView() {
mLeftViewIndex = -1;
mRightViewIndex = 0;
mDisplayOffset = 0;
mCurrentX = 0;
mNextX = 0;
mMaxX = Integer.MAX_VALUE;
mScroller = new Scroller(getContext());
mGesture = new GestureDetector(getContext(), mOnGesture);
}
@Override
public void setOnItemSelectedListener(AdapterView.OnItemSelectedListener listener) {
mOnItemSelected = listener;
}
@Override
public void setOnItemClickListener(AdapterView.OnItemClickListener listener){
mOnItemClicked = listener;
}
@Override
public void setOnItemLongClickListener(AdapterView.OnItemLongClickListener listener) {
mOnItemLongClicked = listener;
}
private DataSetObserver mDataObserver = new DataSetObserver() {
@Override
public void onChanged() {
synchronized(HorizontalListView.this){
mDataChanged = true;
}
invalidate();
requestLayout();
}
@Override
public void onInvalidated() {
reset();
invalidate();
requestLayout();
}
};
@Override
public ListAdapter getAdapter() {
return mAdapter;
}
@Override
public View getSelectedView() {
//TODO: implement
return null;
}
@Override
public void setAdapter(ListAdapter adapter) {
if(mAdapter != null) {
mAdapter.unregisterDataSetObserver(mDataObserver);
}
mAdapter = adapter;
mAdapter.registerDataSetObserver(mDataObserver);
reset();
}
private synchronized void reset(){
initView();
removeAllViewsInLayout();
requestLayout();
}
@Override
public void setSelection(int position) {
//TODO: implement
}
private void addAndMeasureChild(final View child, int viewPos) {
LayoutParams params = child.getLayoutParams();
if(params == null) {
params = new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT);
}
addViewInLayout(child, viewPos, params, true);
child.measure(MeasureSpec.makeMeasureSpec(getWidth(), MeasureSpec.AT_MOST),
MeasureSpec.makeMeasureSpec(getHeight(), MeasureSpec.AT_MOST));
}
@Override
protected synchronized void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
if(mAdapter == null){
return;
}
if(mDataChanged){
int oldCurrentX = mCurrentX;
initView();
removeAllViewsInLayout();
mNextX = oldCurrentX;
mDataChanged = false;
}
if(mScroller.computeScrollOffset()){
int scrollx = mScroller.getCurrX();
mNextX = scrollx;
}
if(mNextX <= 0){
mNextX = 0;
mScroller.forceFinished(true);
}
if(mNextX >= mMaxX) {
mNextX = mMaxX;
mScroller.forceFinished(true);
}
int dx = mCurrentX - mNextX;
removeNonVisibleItems(dx);
fillList(dx);
positionItems(dx);
mCurrentX = mNextX;
if(!mScroller.isFinished()){
post(new Runnable(){
@Override
public void run() {
requestLayout();
}
});
}
}
private void fillList(final int dx) {
int edge = 0;
View child = getChildAt(getChildCount()-1);
if(child != null) {
edge = child.getRight();
}
fillListRight(edge, dx);
edge = 0;
child = getChildAt(0);
if(child != null) {
edge = child.getLeft();
}
fillListLeft(edge, dx);
}
private void fillListRight(int rightEdge, final int dx) {
while(rightEdge + dx < getWidth() && mRightViewIndex < mAdapter.getCount()) {
View child = mAdapter.getView(mRightViewIndex, mRemovedViewQueue.poll(), this);
addAndMeasureChild(child, -1);
rightEdge += child.getMeasuredWidth();
if(mRightViewIndex == mAdapter.getCount()-1) {
mMaxX = mCurrentX + rightEdge - getWidth();
}
if (mMaxX < 0) {
mMaxX = 0;
}
mRightViewIndex++;
}
}
private void fillListLeft(int leftEdge, final int dx) {
while(leftEdge + dx > 0 && mLeftViewIndex >= 0) {
View child = mAdapter.getView(mLeftViewIndex, mRemovedViewQueue.poll(), this);
addAndMeasureChild(child, 0);
leftEdge -= child.getMeasuredWidth();
mLeftViewIndex--;
mDisplayOffset -= child.getMeasuredWidth();
}
}
private void removeNonVisibleItems(final int dx) {
View child = getChildAt(0);
while(child != null && child.getRight() + dx <= 0) {
mDisplayOffset += child.getMeasuredWidth();
mRemovedViewQueue.offer(child);
removeViewInLayout(child);
mLeftViewIndex++;
child = getChildAt(0);
}
child = getChildAt(getChildCount()-1);
while(child != null && child.getLeft() + dx >= getWidth()) {
mRemovedViewQueue.offer(child);
removeViewInLayout(child);
mRightViewIndex--;
child = getChildAt(getChildCount()-1);
}
}
private void positionItems(final int dx) {
if(getChildCount() > 0){
mDisplayOffset += dx;
int left = mDisplayOffset;
for(int i=0;i
HorizontalListViewAdapter.java 横向listview的适配器
package adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.TextView;
import com.example.water.R;
/**
* Created by Administrator on 2019/5/23
*
* desc:月份水平滑动适配
*/
public class HorizontalListViewAdapter extends BaseAdapter {
private String[] mMonth;
private Context mContext;
private LayoutInflater mInflater;
private int selectIndex = -1;
public HorizontalListViewAdapter(Context context, String[] month) {
this.mContext = context;
this.mMonth = month;
mInflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);//LayoutInflater.from(mContext);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.item_month, null);
holder.mMonth = (TextView) convertView.findViewById(R.id.tv_month);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
if (position == selectIndex) {
convertView.setSelected(true);
} else {
convertView.setSelected(false);
}
holder.mMonth.setText(mMonth[position]);
return convertView;
}
@Override
public int getCount() {
return mMonth.length;
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
private static class ViewHolder {
private TextView mMonth ;
}
public void setSelectIndex(int i){
selectIndex = i;
}
}