Develop Reference

How to unselect an item in gridview on second click in android?

I was trying to give background colour to selected items on GridView and I did it successfully using the following code-
gv.setOnItemClickListener(new OnItemClickListener() { // gv is object of GridView
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
gv.getChildAt(arg2).setBackgroundColor(Color.rgb(125, 125, 125));
}
});
Now I want to remove the given background colour when clicked on each item the next time. How can I do it ? Also, when clicked again the background colour should appear and on next click background colour should be removed.

You can check the current color background and then perform some conditional operation to update the view accordingly.
gv.setOnItemClickListener(new OnItemClickListener() { // gv is object of GridView
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
View view = gv.getChildAt(arg2);
int desiredBackgroundColor = android.graphics.Color.rgb(125, 125, 125);
ColorDrawable viewColor = (ColorDrawable) view.getBackground();
if(viewColor == null) {
view.setBackgroundColor(desiredBackgroundColor);
return;
}
int currentColorId = viewColor.getColor();
if(currentColorId == desiredBackgroundColor) {
view.setBackgroundColor(Color.TRANSPARENT);
} else {
view.setBackgroundColor(desiredBackgroundColor);
}
}
});

Android How can I change image on gridview by position?

I have a slide puzzle game.
I want to change image on GridView by position(id).
How could I do that?

Try this
gridView.setOnItemClickListener(new OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position, long arg3)
{
// You can get position of item or imageView and again you can set new image
// by setBackGround() by getting this position
}
});

OnClick Listner of images in Grid View Android

I have a Grid View that have 4 images .So i want to identify which image has been clicked so that corresponding to that i can start a new activity .
So please help me how can i get this
I have tried this
dataView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
}
});

getView can be used for this purpose.for this in getView find View and apply onClicklistner their.to make all views clickable you need to setFocusable(false) on all focusable views.

I have got the solution
dataView.setOnItemClickListener(new OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> arg0, View v, int arg2,
long arg3) {
// TODO Auto-generated method stub
Toast.makeText(
getApplicationContext(),
links[arg2], Toast.LENGTH_SHORT).show();
}
});

int arg2 in the OnItemClick method specifies the position.Using that you can get the item clicked.

Spinner on Button click not responding to Click events:

I have a spinner which drops down when a button is clicked. But when I am trying to set onItemSelectedListener, it is not taking the click events.
spnrLocation.setOnItemSelectedListener(new OnItemSelectedListener() {
#Override
public void onItemSelected(AdapterView<?> parent, View arg1,
int arg2, long arg3) {
System.out.println("location clicked" + arg2);
edtLocation.setText(parent.getItemAtPosition(arg2).toString());
System.out.println("wfefe"
+ parent.getItemAtPosition(arg2).toString());
}
#Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});

// try this
spnrLocation.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
System.out.println("location clicked" + i);
edtLocation.setText(spnrLocation.getSelectedItem().toString());
System.out.println("wfefe"
+ spnrLocation.getSelectedItem().toString());
}
});

Any View supports the android:clickable attribute (which lets you make any View behave like a Button).
There is also android:focusable.

android image gallery-swapping is not working

I am new to android. I am using Intent to show full screen image and swipe between the images. The code is like:
(I am using grid to display images, Once I click on Image in grid I am calling intent)
Gridview_sponsor = (GridView) findViewById(R.id.gridViewSponsor);
Gridview_sponsor
.setOnItemLongClickListener(new OnItemLongClickListener() {
public boolean onItemLongClick(AdapterView<?> arg0,
View arg1, int pos, long id) {
AlertDialog diaBox = AskOption(imagesName.get(pos)
.toString());
diaBox.show();
return true;
}
});
Gridview_sponsor.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> arg0, View arg1,
int position, long arg3) {
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(
Uri.parse("file://" + imagesName.get(position)),
"image/*");
startActivity(intent);
}
});
Previously it was working properly. But after uninstalling existing app it stop swapping.
In above code imagesName.get(position) contains the image path which I am assigning to ACTION_VIEW intent. But it is only showing the image in full screen and zoom in ,zoom out functionality is working fine.But the images are not getting swipe from that folder