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Linux教程網 >> Linux編程 >> Linux編程 >> Android ListView內容無限循環顯示

Android ListView內容無限循環顯示

日期:2017/3/1 10:13:19   编辑:Linux編程

其實要達到Android ListView無限循環顯示,主要就是實現繼承Adapter的類。

我這裡用到的是BaseAdapter

  1. private class MyAdapter extends BaseAdapter{
  2. private Context context;
  3. private String[] strs = null;
  4. LayoutInflater inflater = null;
  5. public MyAdapter(Context context){
  6. this.context = context;
  7. //listview中循環顯示的數據
  8. strs = new String[]{"0","1","2","3","4","5","6","7","8","9"};
  9. inflater = LayoutInflater.from(context);
  10. }
  11. public MyAdapter(){
  12. }
  13. @Override
  14. public int getCount() {
  15. // TODO Auto-generated method stub
  16. //返回int可以保存的最大值,此值為2147483647
  17. return Integer.MAX_VALUE;
  18. }
  19. @Override
  20. public Object getItem(int position) {
  21. // TODO Auto-generated method stub
  22. return position;
  23. }
  24. @Override
  25. public long getItemId(int position) {
  26. // TODO Auto-generated method stub
  27. return position;
  28. }
  29. @Override
  30. public View getView(int position, View view, ViewGroup parent) {
  31. // TODO Auto-generated method stub
  32. ViewHolder holder = null;
  33. if(view == null){
  34. holder = new ViewHolder();
  35. view = inflater.inflate(R.layout.textview, null);
  36. holder.text = (TextView) view.findViewById(R.id.text);
  37. view.setTag(holder);
  38. }else{
  39. holder = (ViewHolder) view.getTag();
  40. }
  41. //strs[position%strs.length]實現listview中數據的循環
  42. holder.text.setText(strs[position%strs.length]);
  43. return view;
  44. }
  45. }
  46. class ViewHolder{
  47. public TextView text;
  48. }
在onCreate方法中將adapter賦值給listview
  1. @Override
  2. public void onCreate(Bundle savedInstanceState) {
  3. super.onCreate(savedInstanceState);
  4. setContentView(R.layout.main);
  5. listView = (ListView) findViewById(R.id.listview);
  6. MyAdapter adapter = new MyAdapter(this);
  7. listView.setAdapter(adapter);
  8. listView.setSelection(Integer.MAX_VALUE/2+1);
  9. //設置listview初始化以後的默認選中項,要不然listview初始化以後只能向上拖動而不能向下拖動。
  10. }
其實,嚴格來說,此程序並不是無限循環,只不過listview內數據太多,達到20多個億,所以也可以算作是無限循環。
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