Question

下面的代码列出了字符串[]练习中的项目。您也可以通过搜索过滤它。

问题是，我有两个需要过滤列表中项目的微调器。所以我的问题是，如何在以后的列表中添加/删除字符串？

public class CalExercises extends Activity {
        private ListView myListView;
        ArrayAdapter<String> myAdapter;
        EditText inputSearch;
        ArrayList<HashMap<String, String>> productList;
        @Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_calexercise);
            String exercises[] = { "Ola", "dolla" };
            myListView = (ListView) findViewById(R.id.exp_list);
            inputSearch = (EditText) findViewById(R.id.itemSearch);
            myAdapter = new ArrayAdapter<String>(this, R.layout.parent_layout, R.id.parent_txt, exercises);
            myListView.setAdapter(myAdapter);
            inputSearch.addTextChangedListener(new TextWatcher() {
                @Override
                public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                   CalExercises.this.myAdapter.getFilter().filter(cs);
                }
                @Override
                public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                              int arg3) {
                }
                @Override
                public void afterTextChanged(Editable arg0) {
                }
            });

            final Spinner spindif = (Spinner) findViewById((R.id.filterDif));
            final Spinner spinmus = (Spinner) findViewById((R.id.filterMus));
            final String diffilter = String.valueOf(spindif.getSelectedItem());
            final String musfilter = String.valueOf(spinmus.getSelectedItem());

            if (diffilter.equals("All Exercises")) {

            }


        }

    }

Answer 1

如果您需要创建一个仅包含与字符串匹配的项目的数组，请创建一个新数组并将其分配给练习：

exercises = filterArray(exercises, filter);  
myAdapter.notifyDataSetChanged();

String[] filterArray(String[] arr, String filter) {
  ArrayList<String> newArray = new ArrayList<String>();
  for (int i=0;i<arr.length()<i++) {
    if (arr[i].contains(filter) {
      newArray.add(arr[i]);
    }
  }
  return newArray.toArray();
}

如果你需要添加到数组......

exercises = addToArray(exercises, newString);
myAdapter.notifyDataSetChanged();

String[] addToArray(String[] arr, String newString) {
  ArrayList<String> newArray = new ArrayList<String>(arr);
  arr.add(newString);
  return newArray.toArray();
}

如果您需要从阵列中删除......

exercises = removeFromArray(exercises, newString);
myAdapter.notifyDataSetChanged();

String[] removeFromArray(String[] arr, String removeMe) {
  ArrayList<String> newArray = new ArrayList<String>(arr);
  for (String item: newArray) {
    if (item.equals(removeMe) {
      newArray.remove(item);
    }
  }
  return newArray.toArray();
}

添加/删除列表视图中的项目？

1 个答案: