【问题讨论】：
【讨论】：
更新了适应单元格大小调整的新代码。
您的问题涉及GridView，但您提供的代码没有提及GridView，而是使用GridLayout，所以我假设GridLayout 是正确的布局。
我已经使用带有一个 2x2 磁贴的模拟布局制作了一个演示。我已经修改了您提供的代码以适应 2x2 磁贴。除了我为实现 2x2 磁贴而添加的代码之外，对 MainAcitivity 的唯一其他更改是 calculateNextIndex 方法，该方法使用不同的方法来计算 (x, y) 位置处的索引。布局和 LongPressListener 类也被模拟了，因为它们没有提供。
这是演示视频：
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static final int ITEMS = 10;
private GridLayout mGrid;
private ScrollView mScrollView;
private ValueAnimator mAnimator;
private Boolean isScroll = false;
private GridLayout.Spec m1xSpec = GridLayout.spec(GridLayout.UNDEFINED, 1);
private GridLayout.Spec m2xSpec = GridLayout.spec(GridLayout.UNDEFINED, 2);
private int mBaseWidth;
private int mBaseHeight;
private int mBaseMargin;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mScrollView = (ScrollView) findViewById(R.id.scrollView);
mScrollView.setSmoothScrollingEnabled(true);
mGrid = (GridLayout) findViewById(R.id.grid);
mGrid.setOnDragListener(new DragListener());
final LayoutInflater inflater = LayoutInflater.from(this);
GridLayout.LayoutParams lp;
DisplayMetrics displayMetrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(displayMetrics);
float dpiToPx = displayMetrics.density;
View view = inflater.inflate(R.layout.item, mGrid, false);
lp = (GridLayout.LayoutParams) view.getLayoutParams();
mBaseWidth = lp.width;
mBaseHeight = lp.height;
mBaseMargin = lp.rightMargin;
for (int i = 0; i < ITEMS; i++) {
final View itemView = inflater.inflate(R.layout.item, mGrid, false);
final TextView text = (TextView) itemView.findViewById(R.id.text);
text.setText(String.valueOf(i + 1));
itemView.setOnLongClickListener(new LongPressListener());
lp = (i == 0) ? make2x2LayoutParams(itemView) : make1x1LayoutParams(itemView);
mGrid.addView(itemView, lp);
}
}
private GridLayout.LayoutParams make2x2LayoutParams(View view) {
GridLayout.LayoutParams lp = (GridLayout.LayoutParams) view.getLayoutParams();
lp.width = mBaseWidth * 2 + 2 * mBaseMargin;
lp.height = mBaseHeight * 2 + 2 * mBaseMargin;
lp.rowSpec = m2xSpec;
lp.columnSpec = m2xSpec;
lp.setMargins(mBaseMargin, mBaseMargin, mBaseMargin, mBaseMargin);
return lp;
}
private GridLayout.LayoutParams make1x1LayoutParams(View view) {
GridLayout.LayoutParams lp = (GridLayout.LayoutParams) view.getLayoutParams();
lp.width = mBaseWidth;
lp.height = mBaseHeight;
lp.setMargins(mBaseMargin, mBaseMargin, mBaseMargin, mBaseMargin);
lp.rowSpec = m1xSpec;
lp.columnSpec = m1xSpec;
return lp;
}
private int mDraggedIndex;
class DragListener implements View.OnDragListener {
@Override
public boolean onDrag(View v, DragEvent event) {
final View view = (View) event.getLocalState();
int index = calculateNextIndex(event.getX(), event.getY());
View child;
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
mDraggedIndex = index;
break;
case DragEvent.ACTION_DRAG_LOCATION:
if (view == v) return true;
// get the new list index
final Rect rect = new Rect();
mScrollView.getHitRect(rect);
final int scrollY = mScrollView.getScrollY();
if (event.getY() - scrollY > mScrollView.getBottom() - 250) {
startScrolling(scrollY, mGrid.getHeight());
} else if (event.getY() - scrollY < mScrollView.getTop() + 250) {
startScrolling(scrollY, 0);
} else {
stopScrolling();
}
child = mGrid.getChildAt(0);
if (index == 0) {
child.setLayoutParams(make1x1LayoutParams(child));
view.setLayoutParams(make2x2LayoutParams(view));
} else if (mDraggedIndex == 0) {
view.setLayoutParams(make1x1LayoutParams(view));
child.setLayoutParams(make2x2LayoutParams(child));
} else {
child.setLayoutParams(make2x2LayoutParams(child));
view.setLayoutParams(make1x1LayoutParams(view));
}
mGrid.removeView(view);
mGrid.addView(view, index);
break;
case DragEvent.ACTION_DROP:
for (int i = 0; i < mGrid.getChildCount(); i++) {
child = mGrid.getChildAt(i);
child.setLayoutParams(make1x1LayoutParams(child));
}
mGrid.removeView(view);
if (index == 0) {
view.setLayoutParams(make2x2LayoutParams(view));
}
mGrid.addView(view, index);
view.setVisibility(View.VISIBLE);
mGrid.getChildAt(0).setLayoutParams(make2x2LayoutParams(mGrid.getChildAt(0)));
break;
case DragEvent.ACTION_DRAG_ENDED:
if (!event.getResult()) {
view.setVisibility(View.VISIBLE);
}
break;
}
return true;
}
}
private void startScrolling(int from, int to) {
if (from != to && mAnimator == null) {
isScroll = true;
mAnimator = new ValueAnimator();
mAnimator.setInterpolator(new OvershootInterpolator());
mAnimator.setDuration(Math.abs(to - from));
mAnimator.setIntValues(from, to);
mAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator valueAnimator) {
mScrollView.smoothScrollTo(0, (int) valueAnimator.getAnimatedValue());
}
});
mAnimator.addListener(new AnimatorListenerAdapter() {
@Override
public void onAnimationEnd(Animator animation) {
isScroll = false;
mAnimator = null;
}
});
mAnimator.start();
}
}
private void stopScrolling() {
if (mAnimator != null) {
mAnimator.cancel();
}
}
private int calculateNextIndexOld(float x, float y) {
// calculate which column to move to
final float cellWidth = mGrid.getWidth() / mGrid.getColumnCount();
final int column = (int) (x / cellWidth);
final float cellHeight = mGrid.getHeight() / mGrid.getRowCount();
final int row = (int) Math.floor(y / cellHeight);
int index = row * mGrid.getColumnCount() + column;
if (index >= mGrid.getChildCount()) {
index = mGrid.getChildCount() - 1;
}
Log.d("MainActivity", "<<<<index=" + index);
return index;
}
private int calculateNextIndex(float x, float y) {
// calculate which column to move to
int index;
for (index = 0; index < mGrid.getChildCount(); index++) {
View child = mGrid.getChildAt(index);
Rect rect = new Rect();
child.getHitRect(rect);
if (x >= rect.left && x <= rect.right && y >= rect.top && y <= rect.bottom) {
break;
}
}
if (index >= mGrid.getChildCount()) {
// Move into empty cell? Calculate based upon uniform cell sizes.
index = calculateNextIndexOld(x, y);
}
if (index >= mGrid.getChildCount()) {
// Can't determine where to put it? Add it to the end.
index = mGrid.getChildCount() - 1;
}
return index;
}
}
如果您稍微使用一下演示，您会发现可以移动瓷砖以打开 1x1 瓷砖间隙。这可能没问题，但如果不是，代码可能需要重新编写。
【讨论】：