有人可以帮我编写一个程序,用于创建可拖动的图像吗?能否给我提供一个示例代码。非常感谢。还有,怎样才能为它制作一个游戏得分呢?期待您的回复。
有人可以帮我编写一个程序,用于创建可拖动的图像吗?能否给我提供一个示例代码。非常感谢。还有,怎样才能为它制作一个游戏得分呢?期待您的回复。
imageView.setOnLongClickListener(new OnLongClickListener() {
public boolean onLongClick(View v) {
modeEdit = false;
ClipData.Item item = new ClipData.Item((CharSequence) v.getTag());
String[] mimeTypes = {ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData dragData = new ClipData(v.getTag().toString(), mimeTypes, item);
// Instantiates the drag shadow builder.
DragShadowBuilder myShadow = new MyDragShadowBuilder(treeBitmap);
v.startDrag(dragData, // the data to be dragged
myShadow, // the drag shadow builder
treeBitmap, // no need to use local data
0 // flags (not currently used, set to 0)
);
return true;
}
});
以下代码是用于设置拖动监听器的:
MyDragEventListener mDragListen = new MyDragEventListener();
protected class MyDragEventListener implements OnDragListener {
public boolean onDrag(View v, DragEvent event) {
final int action = event.getAction();
switch(action) {
case DragEvent.ACTION_DRAG_STARTED:
Log.d(TAG, "FIELD ACTION_DRAG_STARTED");
if (event.getClipDescription().hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN)) {
v.invalidate();
return(true);
}
else {
return(false);
}
case DragEvent.ACTION_DRAG_ENTERED:
Log.d(TAG, "FIELD ACTION_DRAG_ENTERED");
treePresentInMyView = true;
//Toast.makeText(getApplicationContext(), "Dragged data entered", Toast.LENGTH_LONG).show();
v.invalidate();
return(true);
case DragEvent.ACTION_DRAG_LOCATION:
Log.d(TAG, "FIELD ACTION_DRAG_LOCATION");
positionX = event.getX();
positionY = event.getY();
layoutParams = v.getLayoutParams();
return(true);
case DragEvent.ACTION_DRAG_EXITED:
Log.d(TAG, "FIELD ACTION_DRAG_EXITED");
modeEdit = false;
treePresentInMyView = false;
//Toast.makeText(getApplicationContext(), "Dragged data exited", Toast.LENGTH_LONG).show();
v.invalidate();
return(true);
case DragEvent.ACTION_DROP:
Log.d(TAG, "FIELD ACTION_DROP");
keyOfTree = event.getClipDescription().getLabel().toString();
Log.d(TAG, "KEY VALUE = "+keyOfTree);
final ImageView view = new ImageView(getApplicationContext());
String treeWidth = getResources().getString(R.string.treeWidth);
String treeHeight = getResources().getString(R.string.treeHeight);
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(Integer.parseInt(treeWidth), Integer.parseInt(treeHeight));
view.setLayoutParams(params);
view.setImageResource(R.drawable.tree1);
//to get image width and height:
BitmapFactory.Options o = new BitmapFactory.Options();
o.inTargetDensity = DisplayMetrics.DENSITY_DEFAULT;
Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.tree1, o);
int w = bmp.getWidth();
int h = bmp.getHeight();
Log.d(TAG, "width = " + w + " height = " +h);
params.leftMargin = (int) positionX - w;//-w and -h so dragged image placed not at mouse
params.topMargin = (int) positionY - h;// but where actual image is on map
view.setVisibility(View.VISIBLE);
openField.addView(view);
LinearLayout.LayoutParams paramsOpenField = new LinearLayout.LayoutParams(openFieldWidth, openFieldHeight);
openField.setLayoutParams(paramsOpenField);
try {
Thread.sleep(1000);
}
catch (InterruptedException e) {
e.printStackTrace();
}
v.invalidate();
return true;
case DragEvent.ACTION_DRAG_ENDED:
Log.d(TAG, "FIELD ACTION_DRAG_ENDED");
v.invalidate();
if (event.getResult() & treePresentInMyView) {
Log.d(TAG, "(x,y) = ("+positionX+", "+positionY+")");
int subSubPlot = 0;
if (positionX > openField.measuredWidth/2) { //3 and 4
if (positionY > openField.measuredHeight/2) {
subSubPlot = 4;
}
else {
subSubPlot = 3;
}
}
else {
if (positionY > openField.measuredHeight/2) {
subSubPlot = 1;
}
else {
subSubPlot = 2;
}
}
double latitudeOfTree = mValues[0] + (Math.abs(mValues[0] - mValues[2]) / openField.measuredWidth) * positionX;
double longitudeOfTree = mValues[1] + (Math.abs(mValues[1] - mValues[3])/ openField.measuredHeight) * positionY;
// openField.drawTreeCoordinated(latitudeOfTree, longitudeOfTree, positionX, positionY);
return true;
}
else {
return false;
}
default:
Log.e(TAG,"Unknown action type received by OnDragListener.");
break;
};
return false;
}
};