--在開發類似新聞功能的App過程中需要在新聞頁面展示新聞附件，附件一多的話一行展示不完，換行又不好看，為此需要做像今日頭條導航欄那樣可以橫向滑動的列表，不同點在于附件數量是動態添加的 可能有一個 也可能是十個，所以做成ListView方式最好。下面是網上橫向ListView的例子，很好用，拿來借鑒一下：

public class HorizontalListView extends AdapterView<ListAdapter> { 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<View> mRemovedViewQueue = new LinkedList<View>(); 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() {@Overridepublic void onChanged() {synchronized (HorizontalListView.this) {mDataChanged = true;}invalidate();requestLayout();}@Overridepublic void onInvalidated() {reset();invalidate();requestLayout();}};@Override public ListAdapter getAdapter() {return mAdapter; }@Override public View getSelectedView() {//TODO: implementreturn 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() {@Overridepublic 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 < getChildCount(); i++) {View child = getChildAt(i);int childWidth = child.getMeasuredWidth();child.layout(left, 0, left + childWidth, child.getMeasuredHeight());left += childWidth + child.getPaddingRight();}} }public synchronized void scrollTo(int x) {mScroller.startScroll(mNextX, 0, x - mNextX, 0);requestLayout(); }@Override public boolean dispatchTouchEvent(MotionEvent ev) {boolean handled = super.dispatchTouchEvent(ev);handled |= mGesture.onTouchEvent(ev);return handled; }protected boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {synchronized (HorizontalListView.this) {mScroller.fling(mNextX, 0, (int) -velocityX, 0, 0, mMaxX, 0, 0);}requestLayout();return true; }protected boolean onDown(MotionEvent e) {mScroller.forceFinished(true);return true; }private OnGestureListener mOnGesture = new GestureDetector.SimpleOnGestureListener() {@Overridepublic boolean onDown(MotionEvent e) {return HorizontalListView.this.onDown(e);}@Overridepublic boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,float velocityY) {return HorizontalListView.this.onFling(e1, e2, velocityX, velocityY);}@Overridepublic boolean onScroll(MotionEvent e1, MotionEvent e2,float distanceX, float distanceY) {synchronized (HorizontalListView.this) {mNextX += (int) distanceX;}requestLayout();return true;}@Overridepublic boolean onSingleTapConfirmed(MotionEvent e) {for (int i = 0; i < getChildCount(); i++) {View child = getChildAt(i);if (isEventWithinView(e, child)) {if (mOnItemClicked != null) {mOnItemClicked.onItemClick(HorizontalListView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId(mLeftViewIndex + 1 + i));}if (mOnItemSelected != null) {mOnItemSelected.onItemSelected(HorizontalListView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId(mLeftViewIndex + 1 + i));}break;}}return true;}@Overridepublic void onLongPress(MotionEvent e) {int childCount = getChildCount();for (int i = 0; i < childCount; i++) {View child = getChildAt(i);if (isEventWithinView(e, child)) {if (mOnItemLongClicked != null) {mOnItemLongClicked.onItemLongClick(HorizontalListView.this, child, mLeftViewIndex + 1 + i, mAdapter.getItemId(mLeftViewIndex + 1 + i));}break;}}}private boolean isEventWithinView(MotionEvent e, View child) {Rect viewRect = new Rect();int[] childPosition = new int[2];child.getLocationOnScreen(childPosition);int left = childPosition[0];int right = left + child.getWidth();int top = childPosition[1];int bottom = top + child.getHeight();viewRect.set(left, top, right, bottom);return viewRect.contains((int) e.getRawX(), (int) e.getRawY());} }; } 復制代碼

--界面引用如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#dddd" android:gravity="center_horizontal" android:orientation="vertical"><com.hundsun.gildata.downloadpdf.HorizontalListViewandroid:id="@+id/list"android:layout_width="match_parent"android:layout_height="40dp"/> </LinearLayout> 復制代碼

--適配器

public class HorizontalListViewAdapter extends BaseAdapter { List<String> mData; Context mContext; public HorizontalListViewAdapter(Context mContext, List<String> mData) {this.mData = mData;this.mContext=mContext; }@Override public int getCount() {return mData.size(); }@Override public Object getItem(int position) {return position; }private ViewHolder vh = new ViewHolder();private static class ViewHolder {private TextView file; }@Override public long getItemId(int position) {return position; }@Override public View getView(int position, View convertView, ViewGroup parent) {if (convertView == null) {convertView = LayoutInflater.from(mContext).inflate(R.layout.hor_list_item, null);vh.file = (TextView) convertView.findViewById(R.id.file);convertView.setTag(vh);} else {vh = (ViewHolder) convertView.getTag();}return convertView; } } 復制代碼

--適配器很簡單，只需要一個TextView就行了,自定義是為了給他添加附件類型圖標。 適配器用到的hor_list_item.xml如下：

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:layout_width="match_parent"android:layout_height="match_parent"android:background="@xml/attch"android:gravity="center"android:layout_margin="4dp"android:orientation="horizontal"android:padding="4dp"><TextViewandroid:id="@+id/file"android:layout_width="match_parent"android:layout_height="match_parent"android:drawableLeft="@drawable/file"android:drawableStart="@drawable/file"android:gravity="center"android:focusable="false"android:padding="4dp"android:text="附件"android:textColor="#6f6f6f"/></LinearLayout> 復制代碼

--在MainActivity中可以這么用：

public class MainActivity extends AppCompatActivity implements AdapterView.OnItemClickListener { HorizontalListView mHorizontalListView; HorizontalListViewAdapter mAdapter; List<String> mData;@Override protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);mHorizontalListView = (HorizontalListView) findViewById(R.id.list);initView(); } private void initView() {mData = new ArrayList<>();mData.add("504540");mData.add("457662");mData.add("502690");mData.add("457669");mData.add("457672");mData.add("481660");mData.add("479358");mAdapter = new HorizontalListViewAdapter(this, mData);mHorizontalListView.setAdapter(mAdapter);mHorizontalListView.setOnItemClickListener(this);mWifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);WifiInfo wifiInfo = mWifiManager.getConnectionInfo();editPort.setText(int2ip(wifiInfo.getIpAddress()) + ":55555"); } @Override public void onItemClick(AdapterView<?> view, View view1, final int i, long l) {Toast.makeText(this, "id=" + mData.get(i), Toast.LENGTH_SHORT).show(); } } 復制代碼

轉載于:https://juejin.im/post/5a31dc4b6fb9a0451f30f332

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