CODEWITHSUNDEEP
androidgridview
Hellekin
Hellekin

Reputation: 113

Android update GridView in another activity

I'm relativly new in the world of Android programming and I ran into some trouble. The problem is that I have defined a gridview in my MainActivity which consists of several imageViews. Those ImageViews have an onClicklistener which opens another Activity with another gridView. When selecting an element (image) in this grid I want to update the gridview in my MainActivity to adopt the selected Element but actually i have no Idea how to implement this.

I found the following code to update the gridView which is working if I try to update my Grid in the same Activity:

adapter.notifyDataChanged();
grid.invalidateViews();
grid.setAdapter(adapter);

The onClickListener in my second Activity:

mGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

ResolveInfo info = mApps.get(position);

//sets the new drawable
Helper.selectedAppImages[0]=getResources().getDrawable(R.drawable.ic_launcher);

//UPDATE THE GRIDVIEW IN MY MAINACTIVITY     

AppView.this.finish() ;
}
});

Upvotes: 1

Views: 751

Answers (2)

vipul mittal
vipul mittal

Reputation: 17401

Second activity:

mGrid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View v, int position, long id) {

ResolveInfo info = mApps.get(position);

//sets the new drawable
Helper.selectedAppImages[0]=getResources().getDrawable(R.drawable.ic_launcher);

//UPDATE THE GRIDVIEW IN MY MAINACTIVITY     
Intent returnIntent = new Intent();
 returnIntent.putExtra("info",info);//<-- or set the image that you want to change
 AppView.this.setResult(RESULT_OK,returnIntent);     
AppView.this.finish() ;
}
});

Start second activity as:

startActivityForResult(intent,1);

And in main activity override following function:

protected void onActivityResult(int requestCode, int resultCode, Intent data) {

  if (requestCode == 1) {

     if(resultCode == RESULT_OK){      
         String result=data.getStringExtra("info"); 
         adapter.notifyDataChanged();         

     }
     if (resultCode == RESULT_CANCELED) {    
         //Write your code if there's no result
     }
  }
}//onActivityResult

Upvotes: 0

Tepes Lucian
Tepes Lucian

Reputation: 906

In your MainActivity use startActivityForResult to display the second Activity passing down data which you need in your second Activity and also override in your MainActivity onActivityResult. When selecting an image from your second Activity use setResult(RESULT_OK, data) followed by finish(). You'll get the result code and data Intent in the MainActivity onActivityResult.

You can take a look here for more info : http://developer.android.com/training/basics/intents/result.html

Upvotes: 1

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