Learning android from scratch (GridView grid view. Twenty-eight .)

Learning android from scratch (GridView grid view. Twenty-eight .)
The GridView component displays all components in a grid. For example, when creating an album, all the images are displayed in different grids of the same size, the inheritance structure of this component is as follows: java. lang. object? Android. view. View? Android. view. ViewGroup? Android. widget. AdapterView ? Android. widget. AbsListView? Common android. widget. GridView Methods

1	Public GridView (Context context)	Structure		Create a GridView object
2	Public void setStretchMode (int stretchMode)	Normal	Android: stretchMode	Scaling Mode
3	Public void setVerticalSpacing (int verticalSpacing)	Normal	Android: verticalSpacing	Set Vertical spacing
4	Public void setHorizontalSpacing (int horizontalSpacing)	Normal	Android: horizontalSpacing	Set Horizontal spacing
5	Public void setNumColumns (int numColumns)	Normal	Android: numColumns	Sets the data volume displayed in each column. If it is set to auto_fit, it is automatically set.
6	Public void setSelection (int position)	Normal		Set the selected items by default
7	Public void setGravity (int gravity)	Normal	Android: gravity	Sets the alignment mode, which is specified by the Gravity class.
8	Public void setAdapter (ListAdapter adapter)	Normal		Set the display image set

Of course, to use the GridView, you must use the Adapter dataset class to configure image data.
You can use SimpleAdapter and BaseAdapter to configure the adapter. Today, I use BaseAdapter to configure the Adapter data.
XML file

JAVA files

Package com. example. gridview; import android. app. activity; import android. app. alertDialog; import android. content. dialogInterface; import android. content. dialogInterface. onClickListener; import android. OS. bundle; import android. view. view; import android. view. viewGroup; import android. view. viewGroup. layoutParams; import android. widget. adapterView; import android. widget. adapterView. onItemClickListener; import android. widget. baseAdapter; import android. widget. gridView; import android. widget. imageView; public class MainActivity extends Activity {private GridView gridView; // initialize GridViewprivate int images [] = {R. drawable. a1, R. drawable. a2, R. drawable. a3, R. drawable. a4, R. drawable. a5, R. drawable. a6, R. drawable. a7, R. drawable. a8, R. drawable. a9, R. drawable. a10, R. drawable. a11, R. drawable. a12, R. drawable. a13, R. drawable. a14, R. drawable. a15, R. drawable. a16}; // image data @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // obtain the GridView object gridView = (GridView) this. findViewById (R. id. gridview); // set AdptergridView. setAdapter (new MyAdapter (); // sets the listener event gridView. setOnItemClickListener (new OnItemClickListener () {@ Overridepublic void onItemClick (AdapterView
 AdapterView, View view, int position, long id) {// TODO Auto-generated method stub // set the view space ImageView image = new ImageView (MainActivity. this); // sets the image information. setImageResource (images [position]); // you can specify the image size alignment mode. setScaleType (ImageView. scaleType. CENTER); // set the image size. setLayoutParams (new LayoutParams (LayoutParams. WRAP_CONTENT, LayoutParams. WRAP_CONTENT); // create dialog box AlertDialog. builder builder = new AlertDialog. builder (MainActivity. this ). setTitle ("view image "). setView (image ). setIcon (android. r. drawable. btn_star_big_on ). setNegativeButton ("off", new OnClickListener () {@ Overridepublic void onClick (DialogInterface arg0, int arg1) {// TODO Auto-generated method stub }}); // create a dialog box builder. create (); // display the dialog box builder. show () ;}});} class MyAdapter extends BaseAdapter {@ Overridepublic int getCount () {// TODO Auto-generated method stubreturn images. length ;}@ Overridepublic Object getItem (int position) {// TODO Auto-generated method stubreturn position ;}@ Overridepublic long getItemId (int position) {// TODO Auto-generated method stubreturn position;} @ Overridepublic View getView (int position, View myView, ViewGroup parent) {// TODO Auto-generated method stub // return imageView object ImageView imageView = new ImageView (MainActivity. this); imageView. setImageResource (images [position]); imageView. setScaleType (ImageView. scaleType. CENTER); return imageView ;}}}

Effect
You can use the GridView component to achieve a colorful menu effect.

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