问题描述
限时送ChatGPT账号..我有一个 GridView
和附加的适配器.适配器在网格中填充图像.我已在 Activity
中将 setOnTouchLister
设置为 GridView
并仅在适配器中实现.在适配器中,我有一个 Integer[] imageIDs
,其中包含添加的所有图像的资源 IDArrayList
扩展了 ImageView
&设置了其他属性.
I have a GridView
and attached adapter to it. Adapter populates images in the grid. I have set setOnTouchLister
to GridView
in my Activity
and implemented in the adapter only. In adapter I have an Integer[] imageIDs
that contains resource ids of all images that are added & an ArrayList<ImageSourceObject> imgObjsArr
that extends ImageView
& has other properties set.
现在onTouch()
,我想将所选图像的图像更改为其他图像.这是我的代码:在 onCreate
中的 Activity
中设置网格的适配器:
Now onTouch()
, I want to change the image of the selected image to other one. Here's my code :
SEtting adapter of grid in Activity
in onCreate
:
// Set Objects in Game View
gameView = (GridView) this.findViewById(R.id.game_gridView);
gameObjAdapter = new GameObjectsAdapter(this, R.id.game_gridView, null);
gameView.setAdapter(gameObjAdapter);
适配器:
public class GameObjectsAdapter extends BaseAdapter implements OnTouchListener {
super();
mContext = c;
this.layoutResourceId = layoutResourceId;
objects = data;
gridViewResAdap = (GridView) mContext.findViewById(this.layoutResourceId);
createObjectsArray();
Log.d("GOA", "Created Objects Array");
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ImageSourceObject imgView;
if (convertView == null) {
imgView = new ImageSourceObject(mContext);
imgView.setLayoutParams(new GridView.LayoutParams(20, 20));
imgView.getScaleType();
imgView.setScaleType(ScaleType.FIT_XY);
imgView.setPadding(0, 0, 0, 0);
} else {
imgView = (ImageSourceObject) convertView;
}
// Chk status of touched of imgView & set image accordingly
if (imgView.isTouched())
imgView.setImage(R.drawable.droid_touched2);
else
imgView.setImage(imageIds[position]);
return imgView;
}
@Override
public boolean onTouch(View v, MotionEvent event) {
// TODO Auto-generated method stub
int action = event.getActionMasked();
float currentXPos = event.getX();
float currentYPos = event.getY();
int position = gridViewResAdap.pointToPosition((int)currentXPos, (int) currentYPos);
// Key was Pressed Here
if (action == MotionEvent.ACTION_UP) {
if (position > 0) {
// Get the object which is clicked
ImageSourceObject isb = this.imgObjsArr.get(position);
Log.d("GA", " Postion ID " + isb.getId() + " [] ID : " + imageIds[position]);
// Change the status of touched & set image
isb.setTouched(true);
isb.setImage(R.drawable.droid_touched2);
// Update the ArrayList & Integer[] with this updated obj
this.imgObjsArr.set(position, isb);
imageIds[position] = R.drawable.droid_touched2;
Log.d("ISB", "++++ Object ID : " + isb.getId() + " [] ID : " + imageIds[position] + " ISB Touched :" + isb.isTouched());
Toast.makeText(mContext, "Postion Pressed : " + (position+1),
Toast.LENGTH_SHORT).show();
//this.gridViewResAdap.invalidate();
}
return true;
}
return false;
}
日志:
02-19 15:19:11.615: D/GA(2046): Postion ID 2130837556 [] ID : 2130837556
02-19 15:19:11.617: D/ISB(2046): ++++ Object ID : 2130837559 [] ID : 2130837559 ISB Touched :true
日志说 Integer[]
中的对象 &ArrayList
都更新了 &有正确的价值观.毕竟,屏幕上的图像也不会更新.gridViewResAdap
也是从活动传递过来的网格对象.我也尝试在其上调用 invalidate()
,但没有结果.和我的 getView()
一样,我使用的是 imageIDs
,所以我也保持更新.
The logs say that the object in Integer[]
& ArrayList
both are updated & have right values. After all this also the image is not updated on the screen. The gridViewResAdap
is also the object of grid that is passed from the activity. I tried calling invalidate()
on it also, but yet no results. As in my getView()
, I am using imageIDs
, so I have kept that also updated.
图像源对象:
public class ImageSourceObject extends ImageView {
public void setImage(int resourceId) {
super.setImageResource(resourceId);
this.setId(resourceId);
}
此外,onTouch()
调用 onPerformClick()
时出错,我不确定在哪里调用 &为什么要打电话.我还没有在适配器中实现 onClickListener
.在这种情况下可以做什么&当事情在 onTouch()
中管理时,在 onClickListener
中写什么.
Also, onTouch()
gives error to call onPerformClick()
, I am not sure where to call & why to call. I have alos not implemented onClickListener
in the adapter. What can be done in this case & what to write in onClickListener
when things are manged in onTouch()
.
你能帮我知道为什么图像对象没有更新以及我哪里出错了吗?我以为我必须刷新网格,所以也调用了 invalidate(),但没有结果.
Can you help me know why the image object is not updating and where am I going wrong ? I thought I have to refresh the grid, so have also called invalidate(), but no results.
非常感谢任何帮助.
谢谢
推荐答案
在您的 ImageView
开始处理 TouchEvent 之后,它是唯一允许使用该触摸手势执行任何操作的视图.您希望您的 GridView
拦截 TouchEvent,检查 TouchEvent 的 X 和 Y 坐标(event.getX(); event.getY()
)并查看这些坐标是否落在您的 ImageView
对象之一的范围内.如果是,请在 ImageView
或可以触发您的 setImageDrawable()
方法的东西上设置一个标志.我能够在我的一个项目中实现类似的效果,但我必须创建一个自定义 GridView 类(public class yourGridView extends GridView
),然后覆盖以下内容:
After your ImageView
begins handling the TouchEvent, it is the only view allowed to do anything with that touch gesture. You want your GridView
to intercept the TouchEvent, check the X and Y coordinates of the TouchEvent (event.getX(); event.getY()
) and see if those coordinates fall within the bounds of one of your ImageView
objects. If yes, set a flag on the ImageView
or something that can trigger your setImageDrawable()
method. I was able to achieve a similar effect in one of my projects but I had to create a custom GridView class (public class yourGridView extends GridView
), then override the following:
@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action) {
case MotionEvent.ACTION_DOWN:
Log.i(AGL, "InterceptAction = DOWN");
break;
case MotionEvent.ACTION_MOVE:
Log.i(AGL, "InterceptAction = MOVE");
break;
case MotionEvent.ACTION_CANCEL:
Log.i(AGL, "InterceptAction = CANCEL");
return false;
}
return true; //returning true tells your main Activity that you want the custom GridView to handle this TouchEvent; It will then send the TouchEvent to your GridView's onTouchEvent() method for handling.
}
@Override
public boolean onTouchEvent(MotionEvent event) {
int action = event.getAction();
switch(action) {
case MotionEvent.ACTION_MOVE:
int xCoord = (int) event.getX();
int yCoord = (int) event.getY();
Log.i(AGL, "MOVE EVENT;" + "
" + "Touch X = " + Integer.toString(xCoord) + "
" +
"Touch Y = " + Integer.toString(yCoord));
for(int i = 0; i < this.getChildCount(); i++) {
ImageView suspect = (ImageView) this.getChildAt(i);
if(suspect.getBounds().contains(xCoord, yCoord)) {
suspect.CHANGE_YOUR_IMAGE_HERE();
suspect.invalidate();
}
}
break;
}
return true;
}
请注意:getBounds() 是我在自定义 ImageView
类中编写的方法.此方法返回一个 Rect 对象,该对象表示 ImageView
对象的边界框.您必须使用自己的逻辑来获取 ImageView
的边界.
PLEASE NOTE: getBounds() is a method I wrote in my custom ImageView
class. This method returns a Rect object that represents the bounding box of the ImageView
object. You will have to use your own logic for fetching the bounds of your ImageView
.
另请注意:当我在我的项目中运行此逻辑时,我的 ImageView
在触摸手势期间快速更改图像.我还没有想出如何将其限制为每个 MotionEvent.ACTION_MOVE 一次图像更改.
ALSO NOTE: When I run this logic in my project, my ImageView
s change images rapidly during the touch gesture. I haven't figured out yet how to limit it to one image change per MotionEvent.ACTION_MOVE.
我希望这会有所帮助.
这篇关于Android:在适配器中的触摸事件上更新 GridView 中的图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
更多推荐
[db:关键词]
发布评论