Question

我创建了一个自定义列表视图，其中包含一个复选框和两行文本。我想在单击列表项时更改复选框状态（这意味着如果单击列表项的任何部分复选框或文本，复选框将更改状态）。为此，我在custom_list_row xml文件中添加了这个：

<RelativeLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
android:descendantFocusability="blocksDescendants" >

<CheckBox
    android:id="@+id/checkbox"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:focusable="false"
    android:clickable="false" />

在java类中我做了这些：

    listview.setAdapter(adapter);

    listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            final CheckBox checkBox;
            checkBox = (CheckBox)view.findViewById(R.id.checkbox);


            if(checkBox.isChecked()){
                checkBox.setChecked(false);
            }
            else {
                checkBox.setChecked(true);
            }
        }
    });

这很好用。但唯一的问题是，当我选择一些项目并向下滚动时 - ＆gt;返回所选项目 - ＆gt;所选项目将被取消选中。

我没有对setOnCheckedChangeListener

做任何事情

出了什么问题？任何解决这个问题的建议都会有所帮助。

由于

Answer 1

我建议你需要使用recyclerview

public class CardViewActivity extends AppCompatActivity {

 private Toolbar toolbar;

 private RecyclerView mRecyclerView;
 private RecyclerView.Adapter mAdapter;
 private RecyclerView.LayoutManager mLayoutManager;

 private List<Student> studentList;

 private Button btnSelection;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  toolbar = (Toolbar) findViewById(R.id.toolbar);
  btnSelection = (Button) findViewById(R.id.btnShow);

  studentList = new ArrayList<Student>();

  for (int i = 1; i <= 15; i++) {
   Student st = new Student("Student " + i, "androidstudent" + i
     + "@gmail.com", false);

   studentList.add(st);
  }

  if (toolbar != null) {
   setSupportActionBar(toolbar);
   getSupportActionBar().setTitle("Android Students");

  }

  mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);

  // use this setting to improve performance if you know that changes
  // in content do not change the layout size of the RecyclerView
  mRecyclerView.setHasFixedSize(true);

  // use a linear layout manager
  mRecyclerView.setLayoutManager(new LinearLayoutManager(this));

  // create an Object for Adapter
  mAdapter = new CardViewDataAdapter(studentList);

  // set the adapter object to the Recyclerview
  mRecyclerView.setAdapter(mAdapter);

  btnSelection.setOnClickListener(new OnClickListener() {

   @Override
   public void onClick(View v) {
    String data = "";
    List<Student> stList = ((CardViewDataAdapter) mAdapter)
      .getStudentist();

    for (int i = 0; i < stList.size(); i++) {
     Student singleStudent = stList.get(i);
     if (singleStudent.isSelected() == true) {

      data = data + "\n" + singleStudent.getName().toString();
      /*
       * Toast.makeText( CardViewActivity.this, " " +
       * singleStudent.getName() + " " +
       * singleStudent.getEmailId() + " " +
       * singleStudent.isSelected(),
       * Toast.LENGTH_SHORT).show();
       */
     }

    }

    Toast.makeText(CardViewActivity.this,
      "Selected Students: \n" + data, Toast.LENGTH_LONG)
      .show();
   }
  });

 }

}

有关详情，请参阅http://android-pratap.blogspot.in/2015/01/recyclerview-with-checkbox-example.html

或

如果你想使用listview试试这种方式

public class CustomAdapter extends BaseAdapter { private final LayoutInflater inflater; private final Context context; private List<Modelclass> listData; public CustomAdapter(Context mainActivity, List<Modelclass> listData) { context = mainActivity; this.listData = listData; inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); } @Override public int getCount() { return listData.size(); } @Override public Object getItem(int position) { return listData.get(position); } @Override public long getItemId(int position) { return 0; } @Override public View getView(final int position, View convertView, ViewGroup parent) { final ViewHolder holder; if (convertView == null) { holder = new ViewHolder(); convertView = inflater.inflate(R.layout.list_item_poojaselection, null); holder.tv = (TextView) convertView.findViewById(R.id.list_item_poojaname); holder.checks = (CheckBox) convertView.findViewById(R.id.list_item_poojacheck); convertView.setTag(holder); }else { holder = (ViewHolder) convertView.getTag(); } holder.checks.setOnCheckedChangeListener(null); holder.checks.setFocusable(false); if (listData.get(position).isselected) { holder.checks.setChecked(true); } else { holder.checks.setChecked(false); } holder.checks.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton cb, boolean b) { if (checkMaxLimit()) { if (listData.get(position).isselected && b) { holder.checks.setChecked(false); listData.get(position).isselected = false; } else { holder.checks.setChecked(false); listData.get(position).isselected = false; Toast.makeText(context, "Max limit reached", Toast.LENGTH_SHORT).show(); } } else { if (b) { listData.get(position).isselected = true; } else { listData.get(position).isselected = false; } } } }); holder.tv.setText(listData.get(position).getLISTING_NAME()); return convertView; } public boolean checkMaxLimit() { int countermax = 0; for(Modelclass item : listData){ if(item.isselected){ countermax++; } } return countermax >= 5; } public class ViewHolder { TextView tv; public CheckBox checks; } }

Answer 2

请在选中/取消选中复选框时进行更改

listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {

        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            final CheckBox checkBox;
            checkBox = (CheckBox)view.findViewById(R.id.checkbox);


            if(checkBox.isChecked()){
                checkBox.setChecked(false);

                    // Reset the checkbox in array list/Bean  like 

                    list.set(); // set new value of list 

                    adapter.notifyChange();

            }
            else {
                checkBox.setChecked(true);

                 // Reset the checkbox in array list/Bean  like 

                    list.set(); // set new value of list 

                    adapter.notifyChange();
            }
        }
    });

这一改变解决了我的这个问题。

向下滚动时，Listview复选框变为未选中状态

2 个答案: