Android learning --- Gallery View

Android learning --- Gallery View

Gallery and Spinner share the same parent class: AbsPinner, indicating that Gallery and Spinner are both a list box. The difference between them is that the Spinner displays a vertical list selection box, while the Gallery displays a horizontal list selection box. The role of the Spinner is to allow users to choose from, while Gallery allows users to drag to view the previous one and the next one.

The Gallery usage is similar to the usage of the Spinner. You only need to provide a content Adapter for it. The getView method of the Adapter returns the View as the list item of the Gallery list. If the program needs to monitor changes in the Gallery selection, you can add the OnItemSelectedListener listener.

Gallery xml attributes

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(2) MainActivity. java

Package com. example. gallery; import android. app. activity; import android. OS. bundle; import android. view. menu; import android. view. view; import android. view. viewGroup; import android. view. animation. animationUtils; import android. widget. adapterView; import android. widget. adapterView. onItemSelectedListener; import android. widget. baseAdapter; import android. widget. gallery; import android. widget. imageSwitcher; import android. widget. imageView; import android. widget. radioGroup. layoutParams; import android. widget. viewSwitcher. viewFactory; public class MainActivity extends Activity {// define the private ImageSwitcher imgSwt = null; private Gallery gallery = null; @ Overrideprotected void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. activity_main); // obtain the layout component imgSwt = (ImageSwitcher) findViewById (R. id. imgSwt); gallery = (Gallery) findViewById (R. id. gallery); // image final int images [] = new int [] {R. drawable. name01, R. drawable. name02, R. drawable. name03, R. drawable. name04, R. drawable. name05, R. drawable. name06, R. drawable. name07, R. drawable. name08, R. drawable. name09, R. drawable. name10, R. drawable. name11, R. drawable. name12}; // sets the image switching effect imgSwt. setInAnimation (AnimationUtils. loadAnimation (this, android. r. anim. fade_in); imgSwt. setOutAnimation (AnimationUtils. loadAnimation (this, android. r. anim. fade_out); // sets the ViewFactory object imgSwt. setFactory (new ViewFactory () {@ Overridepublic View makeView () {ImageView imageView = new ImageView (MainActivity. this); imageView. setScaleType (ImageView. scaleType. FIT_CENTER); imageView. setLayoutParams (new ImageSwitcher. layoutParams (350,350); return imageView ;}}); // creates a BaseAdapter object and provides the Gallery function to display all images. BaseAdapter adapter = new BaseAdapter () {@ Overridepublic View getView (int position, View convertView, ViewGroup parent) {// create imageviewImageView imageView = new ImageView (MainActivity. this); imageView. setImageResource (images [position]); imageView. setScaleType (ImageView. scaleType. FIT_XY); imageView. setLayoutParams (new Gallery. layoutParams (LayoutParams. WRAP_CONTENT, LayoutParams. WRAP_CONTENT); return imageView ;}@ Overridepublic long getItemId (int position) {return position ;}@ Overridepublic Object getItem (int position) {return position ;}@ Overridepublic int getCount () {return images. length ;}}; // set the adapter Gallery for gallery. setAdapter (adapter); // Add event gallery. setOnItemSelectedListener (new OnItemSelectedListener () {@ Overridepublic void onItemSelected (AdapterView
 Parent, View view, int position, long id) {imgSwt. setImageResource (images [position]) ;}@ Overridepublic void onNothingSelected (AdapterView
 Parent) {// TODO Auto-generated method stub }});}}

The running effect is as follows: