如何獲得buttonclick上的所有listview選中項目？

Question

setContentView(R.layout.activity_violation); 
    db = new DatabaseHelper(this); 
    sqLiteDatabase = db.getReadableDatabase(); 
    spinner = (Spinner) findViewById(R.id.spinner1); 
    loadspinnerdata(); 
    txtTexts = (TextView) findViewById(R.id.texts); 
    btnBack = (Button) findViewById(R.id.btnBack); 
    btnSave = (Button) findViewById(R.id.btnSave); 
    btnSave.setOnClickListener(new View.OnClickListener() { 
     @Override 
     public void onClick(View view) { 
      listviewData(); 
     } 


    }); 

    strSelectedItem = spinner.getSelectedItem().toString(); 


    listview = (ListView) findViewById(R.id.listView); 
    LayoutInflater inflater = getLayoutInflater(); 
    ViewGroup header = (ViewGroup) inflater.inflate(R.layout.list_header, listview, false); 
    listview.addHeaderView(header, null, false); 
    listview.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); 

    list_query = "select _id,section,offence,fine from tblSection"; 
    Cursor clistview = sqLiteDatabase.rawQuery(list_query, null); 


    listadapter = new ListAdapter(this, clistview, 0); 



    listview.setAdapter(listadapter);private void listviewData() { 
    int cntChoice = listview.getCount(); 

    String checked = ""; 

    String unchecked = ""; 
    SparseBooleanArray sparseBooleanArray = listview.getCheckedItemPositions(); 

    for(int i = 0; i < cntChoice; i++) 
    { 

     if(sparseBooleanArray.get(i)) 
     { 
      checked += listview.getItemAtPosition(i).toString() + "\n"; 
     } 
     else if(!sparseBooleanArray.get(i)) 
     { 
      unchecked+= listview.getItemAtPosition(i).toString() + "\n"; 
     } 

    } 

我以填充從數據庫列表視圖中使用的CursorAdapter？所以，我沒有得到的位置，因爲我在arrayAdapter從getView方法得到

public class ListAdapter extends CursorAdapter{ 

TextView tvSection,tvOffence,tvId,tvFine; 
CheckBox chkBox; 
ArrayAdapter<String> objects; 
private boolean chkItem; 
CompoundButton.OnCheckedChangeListener myCheckChangList; 


public ListAdapter(Context context, Cursor c, int _id) { 
    super(context, c,_id); 
} 

@Override 
public View newView(Context context, Cursor cursor, ViewGroup viewGroup) { 
    return LayoutInflater.from(context).inflate(R.layout.listview_item,viewGroup,false); 
} 
public class ViewHolder{ 
    TextView tvSection,tvOffence,tvId,tvFine; 
    CheckBox chkBox; 
    boolean chkItem; 
    boolean selected = false; 
    public ViewHolder(boolean chkItem){ 
     super(); 
     this.chkItem=chkItem; 
    } 

    public ViewHolder() { 

    } 

    public boolean isSelected() { 
     return selected; 
    } 
    public void setSelected(boolean selected) { 
     this.selected = selected; 
    } 
} 

@Override 
public void bindView(View view, Context context, Cursor cursor) { 
    ViewHolder holder=null; 


      holder = new ViewHolder(); 
      holder.tvSection = (TextView) view.findViewById(R.id.txtSection); 
      holder.tvOffence = (TextView) view.findViewById(R.id.txtOffence); 
      holder.tvId = (TextView) view.findViewById(R.id.txtId); 
      holder.tvFine = (TextView) view.findViewById(R.id.txtFine); 
      holder.chkBox = (CheckBox) view.findViewById(R.id.checkBox); 
      holder.chkBox.setOnCheckedChangeListener(myCheckChangList); 
      view.setTag(holder); 
      strFine=cursor.getInt(cursor.getColumnIndexOrThrow("_id")); 
      String strSection = cursor.getString(cursor.getColumnIndexOrThrow("section")); 
      String strOffence = cursor.getString(cursor.getColumnIndexOrThrow("offence")); 
      int strFine = cursor.getInt(cursor.getColumnIndexOrThrow("fine")); 



      holder.tvSection.setText(strSection); 
      holder.tvOffence.setText(strOffence); 
      holder.tvFine.setText(String.valueOf(strFine)); 

    final ViewHolder finalHolder = holder; 

}

我試過，但這個沒有工作。我試過checkbox.setOnclicklistener，它給了我檢查行值單個項目，但沒有多個檢查item.I嘗試sparseboolean數組也。

Answer 1

如果你正試圖從使用複選框上市獲得選擇的值，嘗試這種方式，將工作

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(); 
    } 
    }); 

} 

} 

http://android-pratap.blogspot.in/2015/01/recyclerview-with-checkbox-example.html

Answer 2

在點擊適配器之外，使用下面的代碼。 「ListAdapter」應該是Adapter類名稱。

ListAdapter.unCheck((ViewGroup)view.getParent()); 

如果您點擊是在適配器內部，則忽略上述代碼並使用下面的代碼。

unCheck((ViewGroup)view.getParent()); 

在Adapter中做出以下功能。

public static void unCheck(ViewGroup vg) { 
    for (int i = 0; i < vg.getChildCount(); i++) { 
     View v = vg.getChildAt(i); 
     if (v instanceof CheckBox) { 
      ((CheckBox) v).setChecked(true); 
     } else if (v instanceof ViewGroup) { 
      unCheck((ViewGroup) v); 
     } 
    } 
} 

上面的函數將檢查列表視圖的所有複選框。玩的開心。保重。