Gallery exercise (android)

Gallery is used to display images. You need to specify the source adapter of an image, which is inherited from BaseAdapter. The Code is as follows:

Xml Code

<? Xml version = "1.0" encoding = "UTF-8"?>
<Gallery
Xmlns: android = "http://schemas.android.com/apk/res/android"
Android: id = "@ + id/gallery"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
>


</Gallery>

 

Java code

Package zziss. android. gallerytest;

Import android. app. Activity;
Import android. app. AlertDialog;
Import android. OS. Bundle;
Import android. view. View;
Import android. widget. AdapterView;
Import android. widget. Gallery;

Public class GalleryTestActivity extends Activity {
/** Called when the activity is first created .*/
Private ImageAdapter2 ia;
Private Gallery iGallery;
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
SetContentView (R. layout. main );
IGallery = (Gallery) this. findViewById (R. id. gallery );
Try {
Ia = new ImageAdapter2 (this );
} Catch (IllegalArgumentException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
} Catch (IllegalAccessException e ){
// TODO Auto-generated catch block
E. printStackTrace ();
}
IGallery. setBackgroundResource (R. drawable. aa );
IGallery. setAdapter (ia );

IGallery. setOnItemClickListener (new AdapterView. OnItemClickListener ()
{

@ Override
Public void onItemClick (AdapterView <?> Arg0, View arg1, int arg2,
Long arg3 ){
AlertDialog dlg = new AlertDialog. Builder (GalleryTestActivity. this)
. SetTitle ("Gallery test ")
. SetMessage ("click" + Integer. toString (arg2) + "image ")
//. SetIcon (ia. mImageIds [arg2])
. SetPositiveButton ("OK", null)
. Create ();
Dlg. setCanceledOnTouchOutside (false );
Dlg. show ();


}

});
}
}

 

 

ImageAdapter code

Package zziss. android. gallerytest;

Import android. content. Context;
Import android. view. View;
Import android. view. ViewGroup;
Import android. widget. BaseAdapter;
Import android. widget. Gallery;
Import android. widget. ImageView;

Public class ImageAdapter extends BaseAdapter {

Private Context context;
Public Integer [] mImageIds =
{
R. drawable. phone,
R. drawable. tetris,
R. drawable. tetromino,
R. drawable. text,
R. drawable. videos
};



Public ImageAdapter (Context context ){

This. context = context;
}

@ Override
Public int getCount (){
// TODO Auto-generated method stub
Return mImageIds. length;
}

@ Override
Public Object getItem (int arg0 ){
// TODO Auto-generated method stub
Return arg0;
}

@ Override
Public long getItemId (int position ){
// TODO Auto-generated method stub
Return position;
}

@ Override
Public View getView (int position, View convertView, ViewGroup parent ){
// TODO Auto-generated method stub
ImageView iv = new ImageView (context );
Iv. setImageResource (mImageIds [position]);
Iv. setLayoutParams (new Gallery. LayoutParams (60, 60 ));
Iv. setScaleType (ImageView. ScaleType. FIT_CENTER );
Return iv;
}

}

ImageAdater2 code

This is all the images obtained from drawable and does not need to be encoded to specify image resources.

 

Package zziss. android. gallerytest;
Import java. lang. reflect. Field;
Import java. util. ArrayList;

Import zziss. android. gallerytest. R;

Import android. content. Context;
Import android. graphics. Bitmap;
Import android. graphics. BitmapFactory;
Import android. view. View;
Import android. view. ViewGroup;
Import android. widget. BaseAdapter;
Import android. widget. Gallery;
Import android. widget. ImageView;

Public class ImageAdapter2 extends BaseAdapter {

Private ArrayList <Integer> imgList;
Private ArrayList <Object> sizeList;
Private Context context;
Public ImageAdapter2 (Context context) throws IllegalArgumentException, IllegalAccessException
{
This. context = context;
ImgList = new ArrayList <Integer> ();
SizeList = new ArrayList <Object> ();
Field [] fields = R. drawable. class. getDeclaredFields ();
For (Field field: fields)
{
If (! ("Icon". equals (field. getClass ())))
{
Int index = field. getInt (R. drawable. class );
ImgList. add (index );

Int size [] = new int [2];
Bitmap bitmap = BitmapFactory. decodeResource (context. getResources (), index );
Size [0] = bitmap. getWidth ();
Size [1] = bitmap. getHeight ();
SizeList. add (size );
Bitmap = null;
}
}
}

@ Override
Public int getCount (){
// TODO Auto-generated method stub
Return imgList. size ();
}

@ Override
Public Object getItem (int position ){
// TODO Auto-generated method stub
Return position;
}

@ Override
Public long getItemId (int position ){
// TODO Auto-generated method stub
Return position;
}

@ Override
Public View getView (int position, View convertView, ViewGroup parent ){
// TODO Auto-generated method stub
ImageView iv = new ImageView (context );
Iv. setImageResource (imgList. get (position). intValue ());
Iv. setScaleType (ImageView. ScaleType. FIT_XY );
Int size [] = new int [2];
Size = (int []) sizeList. get (position );
Iv. setLayoutParams (new Gallery. LayoutParams (size [0], size [1]);
Return iv;
}

}