BaseAdapter for Android GridView lattice View

① Create a project
② Images named a.png---p.png In the res/drawabledirectory
③ Modify the main. xml layout and add a GridView and an ImageView.
<? Xml version = "1.0" encoding = "UTF-8"?>
<AbsoluteLayout
Android: id = "@ + id/widget0"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Xmlns: android = "http://schemas.android.com/apk/res/android">
<GridView
Android: id = "@ + id/grid"
Android: layout_width = "fill_parent"
Android: padding = "30dip"
Android: columnWidth = "52px"
Android: layout_height = "210px"
Android: numColumns = "5">
<! -- Set GridView to 30pid with the Five-column margin -->
</GridView>
<ImageView
Android: id = "@ + id/ImageView_Big"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: layout_x = "95px"
Android: layout_y = "250px">
</ImageView>
</AbsoluteLayout>
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④ Definition and instantiation of GridView
/* Define class object */
Private GridView my_gridview;
/* Get the UI resource object from xml */
My_gridview = (GridView) findViewById (R. id. grid );
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⑤ Set the image content in the GridView and ImageAdapter

/* Create a custom ImageAdapter */
MyImageViewAdapter = new ImageAdapter (this );
/* Set an ImageAdapter for the GridView object */
My_gridview.setAdapter (myImageViewAdapter );
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6 internal class ImageAdapter, implements BaseAdapter
Private class myImageAdapter extends BaseAdapter {
@ Override
Public int getCount (){
// TODO Auto-generated method stub
Return 0;
}
@ Override
Public Object getItem (int position ){
// TODO Auto-generated method stub
Return null;
}
@ Override
Public long getItemId (int position ){
// TODO Auto-generated method stub
Return 0;
}
@ Override
Public View getView (int position,
View convertView, ViewGroup parent ){
// TODO Auto-generated method stub
Return null;
}
}
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7. process the Items Click Event of the image in the GridView
/* Add an Items Click Event listener for the GridView */
My_gridview.setOnItemClickListener (this );
@ Override
Public void onItemClick (AdapterView <?> Arg0,
View arg1, int arg2, long arg3 ){
// TODO Auto-generated method stub
/* Click Items event processing for images in the GridView */
}
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Processing of the selected image Items event after moving the processed GridView
/* Add an image Items to move the selected event listener for the GridView */
My_gridview.setOnItemSelectedListener (this );
@ Override
Public void onItemSelected (AdapterView <?> Arg0,
View arg1, int arg2, long arg3 ){
// TODO Auto-generated method stub
/* Process the selected current event in the move focus of the image in the GridView */
}
/* Image Items event processing in the GridView is not selected */
@ Override
Public void onNothingSelected (AdapterView <?> Arg0 ){
// TODO Auto-generated method stub
}
----------------------------- The code is as follows --------------------------------
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Modify mainActivity. java to achieve the effects of image clicking and Image Moving.
Package zyf. GridViewTest;
/* Import the package to be used */
Import android. app. Activity;
Import android. app. AlertDialog;
Import android. content. Context;
Import android. content. DialogInterface;
Import android. content. DialogInterface. OnClickListener;
Import android. OS. Bundle;
Import android. view. View;
Import android. view. ViewGroup;
Import android. widget. AdapterView;
Import android. widget. BaseAdapter;
Import android. widget. GridView;
Import android. widget. ImageView;
Public class GridViewTest extends Activity implements
GridView. OnItemClickListener,
GridView. OnItemSelectedListener {
/** Called when the activity is first created .*/
/* Define class object */
Private GridView my_gridview;
Private ImageView big_imageView;
Private ImageAdapter myImageViewAdapter;
/* Internal class to implement an image adapter */
Public class ImageAdapter extends BaseAdapter {
/* MyContext is the context */
Private Context myContext;
/* The ImageView used by the GridView to load the image */
Private ImageView the_imageView;
// This is an array of image resource IDs.
Private Integer [] mImageIds = {
R. drawable. a, R. drawable. B, R. drawable. c, R. drawable. d,
R. drawable. e, R. drawable. f, R. drawable. g, R. drawable. h,
R. drawable. I, R. drawable. j, R. drawable. k, R. drawable. l,
R. drawable. m, R. drawable. n, R. drawable. o, R. drawable. p
};
/* Constructor */
Public ImageAdapter (Context myContext ){
// TODO Auto-generated constructor stub
This. myContext = myContext;
/* Input a Context. In this example, the input is GridViewTest */
}
/* Return the length of the resource ID array */
@ Override
Public int getCount (){
// TODO Auto-generated method stub
Return mImageIds. length;
}
/* Get Item */
@ Override
Public Object getItem (int position ){
// TODO Auto-generated method stub
Return position;
}
/* Get the Items ID */
@ Override
Public long getItemId (int position ){
// TODO Auto-generated method stub
Return position;
}

 
// Process each item in the gridview
/* Get the View object to be displayed */
@ Override
Public View getView (int position,
View convertView, ViewGroup parent ){
// TODO Auto-generated method stub
/* Create an ImageView */
The_imageView = new ImageView (myContext );
// Set the image source from the resource ID.
The_imageView.setImageResource (mImageIds [position]);
/* Adapt the ImageView to the boundary */
The_imageView.setAdjustViewBounds (true );
/* Set the style of the background image */
The_imageView.setBackgroundResource (
Android. R. drawable. picture_frame );
/* Return the ImageView with multiple image IDs */
Return the_imageView;
}
/* Obtain the image ID at the specified position */
Public Integer getcheckedImageIDPostion (int theindex ){
Return mImageIds [theindex];
}
}
@ Override
Public void onCreate (Bundle savedInstanceState ){
Super. onCreate (savedInstanceState );
/* Set the homepage Layout */
SetContentView (R. layout. main );
/* Get the UI resource object from xml */
My_gridview = (GridView) findViewById (R. id. grid );
Big_imageView =
(ImageView) findViewById (R. id. ImageView_Big );
/* Create a custom ImageAdapter */
MyImageViewAdapter = new ImageAdapter (this );
/* Set an ImageAdapter for the GridView object */
My_gridview.setAdapter (myImageViewAdapter );
/* Add an Items Click Event listener for the GridView */
My_gridview.setOnItemClickListener (this );
/* Add an image Items to move the selected event listener for the GridView */
My_gridview.setOnItemSelectedListener (this );
}
@ Override
Public void onItemClick (AdapterView <?> Arg0,
View arg1, int arg2, long arg3 ){
/* Click the Items icon in the GridView and an AlterDialog prompt box is displayed */
New AlertDialog. Builder (this)
. SetTitle ("Image Browsing ")
/* Obtain the corresponding image and display it */
. SetIcon (myImageViewAdapter. getcheckedImageIDPostion (arg2 ))
/* Add a button */
. SetPositiveButton ("return", new OnClickListener (){
@ Override
Public void onClick (DialogInterface dialog,
Int which ){
}
/* Display prompt box */
}). Show ();
}
@ Override
Public void onItemSelected (AdapterView <?> Arg0,
View arg1, int arg2, long arg3 ){
// TODO Auto-generated method stub
/* When the move focus of an image in the GridView is selected,
* The Image view in the big image below shows the corresponding large image */
Big_imageView.setImageResource (myImageViewAdapter
. GetcheckedImageIDPostion (arg2 ));
}
/* Image Items event processing in the GridView is not selected */
@ Override
Public void onNothingSelected (AdapterView <?> Arg0 ){
// TODO Auto-generated method stub
}
}
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Author: t80t90s