Java DragEvent.ACTION_DRAG_STARTED属性代码示例

/**
 * Handles drag event.
 */
@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            // Only handle plain text drag and drop.
            return event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN);
        case DragEvent.ACTION_DRAG_ENTERED:
            requestFocus();
            return true;
        case DragEvent.ACTION_DROP:
            handlePasteClip(event.getClipData());
            return true;
    }
    return false;
}
 

@Override
public boolean onDrag(View view, DragEvent event) {
    if (mLauncher == null || mDragController == null) {
        postCleanup();
        return false;
    }
    if (event.getAction() == DragEvent.ACTION_DRAG_STARTED) {
        if (onDragStart(event)) {
            return true;
        } else {
            postCleanup();
            return false;
        }
    }
    return mDragController.onDragEvent(mDragStartTime, event);
}
 

/**
 * Same as {@link #recordMotionEvent}. It creates a temporary {@link MotionEvent} object
 * using {@param event} for tracking velocity.
 */
void recordDragEvent(long dragStartTime, DragEvent event) {
    final int motionAction;
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            motionAction = MotionEvent.ACTION_DOWN;
            break;
        case DragEvent.ACTION_DRAG_LOCATION:
            motionAction = MotionEvent.ACTION_MOVE;
            break;
        case DragEvent.ACTION_DRAG_ENDED:
            motionAction = MotionEvent.ACTION_UP;
            break;
        default:
            return;
    }
    MotionEvent emulatedEvent = MotionEvent.obtain(dragStartTime, SystemClock.uptimeMillis(),
            motionAction, event.getX(), event.getY(), 0);
    recordMotionEvent(emulatedEvent);
    emulatedEvent.recycle();
}
 

@Override
public boolean onDrag(View view, DragEvent dragEvent) {
    switch (dragEvent.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            AttachmentsProvider provider =
                    AttachmentsProviderFactory.getAttachmentProvider(getContext());
            return mCallback != null && provider.isSupported();
        case DragEvent.ACTION_DRAG_ENTERED:
            setBackgroundColor(ContextCompat.getColor(getContext(), R.color.attachmentOverlay));
            return isValidDragEvent(dragEvent.getClipData());
        case DragEvent.ACTION_DRAG_ENDED:
            setBackgroundColor(ContextCompat.getColor(getContext(), android.R.color.transparent));
            return true;
        case DragEvent.ACTION_DRAG_EXITED:
        case DragEvent.ACTION_DRAG_LOCATION:
            return true;
        case DragEvent.ACTION_DROP:
            if (isValidDragEvent(dragEvent.getClipData())) {
                final List<Attachment> attachments = extractAttachments(dragEvent.getClipData());
                post(() -> mCallback.onAttachmentsDropped(attachments));
                return true;
            }
            // Fallback
    }
    return false;
}
 

@Override
public boolean dispatchDragEvent(DragEvent ev) {
    final DragEvent event = ev;
    boolean r = super.dispatchDragEvent(ev);
    if (r && (ev.getAction() == DragEvent.ACTION_DRAG_STARTED || ev.getAction() == DragEvent.ACTION_DRAG_ENDED)) {
        // If we got a start or end and the return value is true, our
        // onDragEvent wasn't called by ViewGroup.dispatchDragEvent
        // So we do it here.
        this.post(new Runnable() {
            @Override
            public void run() {
                onDragEvent(event);
            }
        });


        // fix crash on older versions of android
        try {
            super.dispatchDragEvent(ev);
        } catch (NullPointerException e) {
            e.printStackTrace();
        }
    }
    return r;
}
 

private boolean handleDragEvent(final View v, final DragEvent event) {
    switch(event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
        case DragEvent.ACTION_DRAG_ENTERED:
        case DragEvent.ACTION_DRAG_LOCATION:
        case DragEvent.ACTION_DRAG_EXITED:
        case DragEvent.ACTION_DRAG_ENDED:
            return true;

        case DragEvent.ACTION_DROP:
            final String phrase = event.getClipData().getItemAt(0).getText().toString();
            moveViewToCorrectLocationFromDrag(v, phrase);
            return true;

        default:
            return false;
    }
}
 

@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            return mEditor != null && mEditor.hasInsertionController();

        case DragEvent.ACTION_DRAG_ENTERED:
            TextView.this.requestFocus();
            return true;

        case DragEvent.ACTION_DRAG_LOCATION:
            final int offset = getOffsetForPosition(event.getX(), event.getY());
            Selection.setSelection((Spannable)mText, offset);
            return true;

        case DragEvent.ACTION_DROP:
            if (mEditor != null) mEditor.onDrop(event);
            return true;

        case DragEvent.ACTION_DRAG_ENDED:
        case DragEvent.ACTION_DRAG_EXITED:
        default:
            return true;
    }
}
 

public boolean onDrag(View v, DragEvent event) {
  final int action = event.getAction();

  switch (action) {
    case DragEvent.ACTION_DRAG_STARTED:
      return dragStart(v, event);
    case DragEvent.ACTION_DRAG_ENTERED:
      return true;
    case DragEvent.ACTION_DRAG_LOCATION:
      return this.dragLocation(v, event);
    case DragEvent.ACTION_DRAG_EXITED:
      return true;
    case DragEvent.ACTION_DROP:
      return this.dragDrop(v, event);
    case DragEvent.ACTION_DRAG_ENDED:
      return true;
    default:
      Log.e("MarkerDragEventListener", "Unknown action type received by OnDragListener.");
      break;
  }
  return false;
}
 

private TableRow createNewTableRow() {
	TableRow row = new TableRow(getActivity()) {
		@Override
		public boolean dispatchDragEvent(DragEvent ev) {
			boolean r = super.dispatchDragEvent(ev);
			if (r && (ev.getAction() == DragEvent.ACTION_DRAG_STARTED || ev.getAction() == DragEvent.ACTION_DRAG_ENDED)) {
				// If we got a start or end and the return value is true,
				// our
				// onDragEvent wasn't called by ViewGroup.dispatchDragEvent
				// So we do it here.
				onDragEvent(ev);
			}
			return r;
		}
	};
	row.setLayoutParams(new TableRow.LayoutParams(TableRow.LayoutParams.WRAP_CONTENT, TableRow.LayoutParams.WRAP_CONTENT));
	row.setPadding(2, 5, 5, 2);
	return row;
}
 

@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
    case DragEvent.ACTION_DRAG_STARTED:
        //Log.i(TAG, "Drag Started.");
        return onDragStarted(event);
    case DragEvent.ACTION_DRAG_ENTERED:
        Log.i(TAG, "Drag entered ADDV");
        return onDragEntered(event);
    case DragEvent.ACTION_DRAG_LOCATION:
        return onDragMoveOn(event);
    case DragEvent.ACTION_DRAG_EXITED:
        Log.i(TAG, "Drag exited ADDV");
        return onDragExited(event);
    case DragEvent.ACTION_DROP:
        Log.i(TAG, "Drag droped ADDV");
        return onDrop(event);
    case DragEvent.ACTION_DRAG_ENDED:
        //Log.i(TAG, "Drag ended ADDV.");
        return onDragEnded(event);
    }

    return super.onDragEvent(event);
}
 

@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
    case DragEvent.ACTION_DRAG_STARTED:
        //Log.i(TAG, "DropLV Drag Started.");
        return onDragStarted(event);
    case DragEvent.ACTION_DRAG_ENTERED:
        Log.i(TAG, "Drag entered DropLV.");
        return onDragEntered(event);
    case DragEvent.ACTION_DRAG_LOCATION:
        return onDragMoveOn(event);
    case DragEvent.ACTION_DRAG_EXITED:
        Log.i(TAG, "Drag exited DropLV.");
        return onDragExited(event);
    case DragEvent.ACTION_DROP:
        Log.i(TAG, "Drag droped DropLV.");
        return onDrop(event);
    case DragEvent.ACTION_DRAG_ENDED:
        //Log.i(TAG, "DropLV Drag ended.");
        return onDragEnded(event);
    }

    return super.onDragEvent(event);
}
 

@Override
public boolean onDragEvent(DragEvent event) {
    switch (event.getAction()) {
    case DragEvent.ACTION_DRAG_STARTED:
        //Log.i(TAG, "DropGV Drag Started.");
        return onDragStarted(event);
    case DragEvent.ACTION_DRAG_ENTERED:
        Log.i(TAG, "Drag entered DropGV.");
        return onDragEntered(event);
    case DragEvent.ACTION_DRAG_LOCATION:
        return onDragMoveOn(event);
    case DragEvent.ACTION_DRAG_EXITED:
        Log.i(TAG, "Drag exited DropGV");
        return onDragExited(event);
    case DragEvent.ACTION_DROP:
        Log.i(TAG, "Drag droped DropGV");
        return onDrop(event);
    case DragEvent.ACTION_DRAG_ENDED:
        //Log.i(TAG, "Drag ended DropGV.");
        return onDragEnded(event);
    }

    return super.onDragEvent(event);
}
 

@Override
public boolean onDragEvent (DragEvent event) {
    final int action = event.getAction();

    switch (action) {
        case DragEvent.ACTION_DRAG_STARTED:
            mLastX = event.getX();
            mLastY = event.getY();
            return true;

        case DragEvent.ACTION_DRAG_ENTERED:
            return true;

        case DragEvent.ACTION_DRAG_LOCATION:
            mLastX = event.getX();
            mLastY = event.getY();
            mEventListener.onDriverDragMove(event.getX(), event.getY());
            return true;

        case DragEvent.ACTION_DROP:
            mLastX = event.getX();
            mLastY = event.getY();
            mEventListener.onDriverDragMove(event.getX(), event.getY());
            mEventListener.onDriverDragEnd(mLastX, mLastY);
            return true;
        case DragEvent.ACTION_DRAG_EXITED:
            mEventListener.onDriverDragExitWindow();
            return true;

        case DragEvent.ACTION_DRAG_ENDED:
            mEventListener.onDriverDragCancel();
            return true;

        default:
            return false;
    }
}
 

public boolean onDrag(View v, DragEvent event) {
    int action = event.getAction();
    switch (event.getAction()) {
        case DragEvent.ACTION_DRAG_STARTED:
            v.setBackgroundColor(LIGHT_BLUE);
            v.invalidate();
            return true;
        case DragEvent.ACTION_DRAG_ENTERED:
            v.setBackgroundColor(LIGHT_GREEN);
            v.invalidate();
            return true;
        case DragEvent.ACTION_DRAG_EXITED:
            v.setBackgroundColor(LIGHT_BLUE);
            v.invalidate();
            return true;
        case DragEvent.ACTION_DRAG_ENDED:
            v.setBackgroundColor(Color.WHITE);
            v.invalidate();
            return true;
        case DragEvent.ACTION_DROP:
            // Dropped, reassign Tile to the target Layout
            LetterTile tile = (LetterTile) event.getLocalState();
            tile.moveToViewGroup((ViewGroup) v);
            if (stackedLayout.empty()) {
                TextView messageBox = (TextView) findViewById(R.id.message_box);
                messageBox.setText(word1 + " " + word2);
            }
            /**
             **
             **  YOUR CODE GOES HERE
             **
             **/
            return true;
    }
    return false;
}
 

@Override
public boolean onDrag(View v, DragEvent event) {
	switch (event.getAction()) {
	case DragEvent.ACTION_DRAG_STARTED:
		// Do nothing
		break;
	case DragEvent.ACTION_DRAG_ENTERED:
		v.setAlpha(0.5F);
		break;
	case DragEvent.ACTION_DRAG_EXITED:
		v.setAlpha(1F);
		break;
	case DragEvent.ACTION_DROP:
		View view = (View) event.getLocalState();
		View item = (View) view.getParent().getParent();
		for (int i = 0, j = videosScroll.getChildCount(); i < j; i++) {
			if (videosScroll.getChildAt(i).findViewById(R.id.editor_image) == v) {
				// 当前位置
				videosScroll.removeView(item);
				videosScroll.addView(item, i);
				break;
			}
		}
		RefreshVideosScroll(true);
		break;
	case DragEvent.ACTION_DRAG_ENDED:
		v.setAlpha(1F);
	default:
		break;
	}
	return true;
}