我正在Dialogfragment中进行一些修改。
val params = dialog.window!!.attributes
// params.width = (getWidth() * 0.7).toInt()
params.height = (getHeight() * 0.75).toInt()
dialog.window!!.attributes = params as android.view.WindowManager.LayoutParams
然后我将Swipehelper附加到recyclerview中。 我的SwipeHelper类
public abstract class SwipeHelper extends ItemTouchHelper.SimpleCallback implements View.OnTouchListener {
public int BUTTON_WIDTH = 90;//converted later inside construcor
private RecyclerView recyclerView;
private List<UnderlayButton> buttons;
private GestureDetector gestureDetector;
private int swipedPos = -1;
private float swipeThreshold = 0.5f;
private Map<Integer, List<UnderlayButton>> buttonsBuffer;
private Queue<Integer> recoverQueue;
private Context activity;
private int previousOrientationWidth = 0;
private View itemView;
private float convertForDisplay(float num) {
return selectedTapArea(activity, (int) num);
}
private float selectedTapArea(Context context, int unit) {
// TODO Auto-generated method stub
float tap_pixel = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, unit, context
.getResources().getDisplayMetrics());
return tap_pixel;
}
private GestureDetector.SimpleOnGestureListener gestureListener = new GestureDetector.SimpleOnGestureListener() {
@Override
public boolean onSingleTapConfirmed(MotionEvent e) {
for (UnderlayButton button : buttons) {
if (button.onClick(e.getX(), e.getY()))
break;
}
return true;
}
};
@Override
public boolean onTouch(View view, MotionEvent e) {
if (swipedPos < 0) return false;
Point point = new Point((int) e.getRawX(), (int) e.getRawY());
RecyclerView.ViewHolder swipedViewHolder = recyclerView.findViewHolderForAdapterPosition(swipedPos);
if (swipedViewHolder != null) {
View swipedItem = swipedViewHolder.itemView;
Rect rect = new Rect();
swipedItem.getGlobalVisibleRect(rect);
if (e.getAction() == MotionEvent.ACTION_DOWN || e.getAction() == MotionEvent.ACTION_UP || e.getAction() == MotionEvent.ACTION_MOVE) {
if (rect.top < point.y && rect.bottom > point.y) {
gestureDetector.onTouchEvent(e);
} else {
recoverQueue.add(swipedPos);
swipedPos = -1;
recoverSwipedItem();
}
}
}
return false;
}
public SwipeHelper(Context activity, RecyclerView recyclerView) {
super(0, ItemTouchHelper.LEFT);
this.recyclerView = recyclerView;
this.activity=activity;
this.buttons = new ArrayList<>();
this.gestureDetector = new GestureDetector(activity, gestureListener);
this.activity = activity;
this.recyclerView.setOnTouchListener(this);
buttonsBuffer = new HashMap<>();
recoverQueue = new LinkedList<Integer>() {
@Override
public boolean add(Integer o) {
if (contains(o))
return false;
else
return super.add(o);
}
};
BUTTON_WIDTH = ((int) convertForDisplay(90));
attachSwipe();
}
@Override
public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, RecyclerView.ViewHolder target) {
return false;
}
@Override
public void onSwiped(RecyclerView.ViewHolder viewHolder, int direction) {
int pos = viewHolder.getAdapterPosition();
if (swipedPos != pos)
recoverQueue.add(swipedPos);
swipedPos = pos;
if (buttonsBuffer.containsKey(swipedPos))
buttons = buttonsBuffer.get(swipedPos);
else
buttons.clear();
buttonsBuffer.clear();
swipeThreshold = 0.5f * buttons.size() * BUTTON_WIDTH;
recoverSwipedItem();
}
@Override
public float getSwipeThreshold(RecyclerView.ViewHolder viewHolder) {
return swipeThreshold;
}
@Override
public float getSwipeEscapeVelocity(float defaultValue) {
return defaultValue;
}
@Override
public float getSwipeVelocityThreshold(float defaultValue) {
return 5.0f * defaultValue;
}
@Override
public void onChildDraw(Canvas c, RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder, float dX, float dY, int actionState, boolean isCurrentlyActive) {
int pos = viewHolder.getAdapterPosition();
if(previousOrientationWidth != 0 && previousOrientationWidth == Math.abs(dX)){
dX = -itemView.getWidth();
}
float translationX = dX;
itemView = viewHolder.itemView;
/*if (recyclerView.getAdapter() instanceof MarkUpAdapter && pos >= 0) { //Bug 30781 - Application crashes repeatedly on deleting markups-By Rustam on 11th July 2018
MarkUpAdapter adapter = ((MarkUpAdapter) recyclerView.getAdapter());
if (!PermissionManager.getInstance().canDeleteMarkup(adapter.getItemAt(pos))) {
return;
}
}*/
if (pos < 0) {
swipedPos = pos;
return;
}
if (actionState == ItemTouchHelper.ACTION_STATE_SWIPE) {
if (dX < 0) {
List<UnderlayButton> buffer = new ArrayList<>();
if (!buttonsBuffer.containsKey(pos)) {
instantiateUnderlayButton(viewHolder, buffer);
buttonsBuffer.put(pos, buffer);
} else {
buffer = buttonsBuffer.get(pos);
}
translationX = dX * buffer.size() * BUTTON_WIDTH / itemView.getWidth();
drawButtons(c, itemView, buffer, pos, translationX);
}
}
super.onChildDraw(c, recyclerView, viewHolder, translationX, dY, actionState, isCurrentlyActive);
}
public synchronized void recoverSwipedItem() {
while (!recoverQueue.isEmpty()) {
int pos = recoverQueue.poll();
if (pos > -1) {
recyclerView.getAdapter().notifyItemChanged(pos);
}
}
}
private void drawButtons(Canvas c, View itemView, List<UnderlayButton> buffer, int pos, float dX) {
float right = itemView.getRight();
float dButtonWidth = (-1) * dX / buffer.size();
for (UnderlayButton button : buffer) {
float left = right - dButtonWidth;
button.onDraw(c, new RectF(left, itemView.getTop(), right, itemView.getBottom()), pos);
right = left;
}
}
ItemTouchHelper itemTouchHelper;
public void attachSwipe() {
itemTouchHelper = new ItemTouchHelper(this);
itemTouchHelper.attachToRecyclerView(recyclerView);
recyclerView.setOnTouchListener(this);
}
public void dettachSwipe() {
recoverSwipedItem();
itemTouchHelper.attachToRecyclerView(null);
recyclerView.clearOnChildAttachStateChangeListeners();
recyclerView.setOnTouchListener(null);
}
public void resetSwipePos() {
swipedPos = -1;
}
public int getSwipedPos() {
return swipedPos;
}
public void handleOrientationChange(){
if(itemView != null){
previousOrientationWidth = itemView.getWidth();
}
}
public abstract void instantiateUnderlayButton(RecyclerView.ViewHolder viewHolder, List<UnderlayButton> underlayButtons);
public static class UnderlayButton {
private float PADDING = 5;
private String text;
private int imageResId;
private int color;
private int pos;
private RectF clickRegion;
private Context activity;
private UnderlayButtonClickListener clickListener;
public UnderlayButton(Context activity, String text, int imageResId, int color, UnderlayButtonClickListener clickListener) {
this.text = text;
this.imageResId = imageResId;
this.color = color;
this.clickListener = clickListener;
this.activity=activity;
PADDING = convertForDisplay(5);
}
private float convertForDisplay(float num) {
return selectedTapArea(activity, (int) num);
}
private float selectedTapArea(Context context, int unit) {
// TODO Auto-generated method stub
float tap_pixel = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, unit, context
.getResources().getDisplayMetrics());
return tap_pixel;
}
public boolean onClick(float x, float y) {
if (clickRegion != null && clickRegion.contains(x, y)) {
clickListener.onClick(pos);
return true;
}
return false;
}
public void onDraw(Canvas c, RectF rect, int pos) {
Paint p = new Paint();
// Draw background
p.setColor(color);
c.drawRect(rect, p);
// Draw Text
p.setColor(Color.WHITE);
p.setTextSize(convertForDisplay(12));
Rect r = new Rect();
// float cHeight = rect.height();
// float cWidth = rect.width();
p.setTextAlign(Paint.Align.LEFT);
p.getTextBounds(text, 0, text.length(), r);
Bitmap image = getDrawableBitmap();
PointF textRect = getTextDisp(rect, r, image == null ? 0 : image.getHeight());
PointF imageRect = image == null ? new PointF() : getBitmapDisp(rect, r.height(), image);
c.drawText(text, rect.left + textRect.x, rect.top + textRect.y + PADDING / 2, p);
if (image != null) {
c.drawBitmap(image, rect.left + imageRect.x, rect.top + imageRect.y - PADDING / 2, new Paint());
}
clickRegion = rect;
this.pos = pos;
}
private PointF getBitmapDisp(RectF container, float textHeight, Bitmap bitmap) {
float width = bitmap.getWidth();
float height = bitmap.getHeight() + textHeight;
PointF bitmapPoint = new PointF();
bitmapPoint.x = (container.width() - width) / 2;
bitmapPoint.y = (container.height() - height) / 2;
return bitmapPoint;
}
private PointF getTextDisp(RectF container, Rect textRect, float bitmapHeight) {
float width = textRect.width();
float height = textRect.height() + bitmapHeight;
PointF textPoint = new PointF();
textPoint.x = (container.width() - width) / 2 - textRect.left;
textPoint.y = (container.height() + height) / 2 - textRect.bottom;
return textPoint;
}
private Bitmap getDrawableBitmap() {
if (imageResId > 0) {
Drawable drawable = activity.getResources().getDrawable(imageResId);
float aspectRatio = drawable.getIntrinsicHeight() / ((float) drawable.getIntrinsicWidth());
int width = ((int)convertForDisplay(20));
int height = (int) (width * aspectRatio);
Bitmap resultPhoto = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_4444);
Canvas canvas = new Canvas(resultPhoto);
drawable.setBounds(0, 0, width, height);
drawable.draw(canvas);
return resultPhoto;
} else {
return null;
}
}
}
public interface UnderlayButtonClickListener {
void onClick(int pos);
}
}
现在，recyclerview代码：-
object : SwipeHelper(fragment.context, view) {
override fun instantiateUnderlayButton(viewHolder: RecyclerView.ViewHolder, underlayButtons: MutableList<UnderlayButton>) {
underlayButtons.add(UnderlayButton(
activity,
"Delete",
0,
ActivityCompat.getColor(activity, R.color.bg_row_background),
UnderlayButtonClickListener {
onSwiped(swipedPos)
}
))
}
}
我面临的问题是，侦听器没有调用delete操作，而是在单击删除按钮时调用了underlayButtons.add()。
请注意，以上问题仅在下一行出现
params.height = (getHeight() * 0.75).toInt()
我无法在SwipeHelper类中找到需要更改的地方。