滚动列表视图BaseAdapter上CheckBox的选中/未选中状态更改 [英] CheckBox checked/unchecked state changes on scroll listview BaseAdapter
本文介绍了滚动列表视图BaseAdapter上CheckBox的选中/未选中状态更改的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我有一个列表视图，其中带有一些预先选中的复选框.当我用来取消选中已选中的复选框并再次滚动时，它会被选中；如果我选中未选中的复选框然后再滚动，它会变为未选中状态.
I have the list view with some pre-checked checked boxes. When I use to uncheck the checked checkbox and scroll it again, it gets checked, and if I check the unchecked the checkbox then scroll it, it changed to the unchecked state.
当我
-
选中该复选框，然后滚动它，它不会被选中
check the checkbox and then scroll it, it gets unchecked
取消选中预先选中的复选框并滚动它，它将被选中
uncheck the pre checked checkbox and scroll it, it gets checked
代码:
public class Adapter extends BaseAdapter {
private Context activity;
private ArrayList<Data> data;
private static LayoutInflater inflater = null;
private View vi;
TextView roll;
TextView menu;
CheckBox checkBox;
CheckBox cb;
boolean[] checkBoxState;//maintain a local boolean array to store the checked status of checkboxes positionwise
public Adapter(Context context, ArrayList<Data> items) {
this.activity = context;
this.data = items;
checkBoxState=new boolean[items.size()];//initializing the local boolean array inside the constructor
inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public int getCount() {
return data.size();
}
@Override
public Object getItem(int i) {
return data.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int position, View view, ViewGroup viewGroup) {
vi = view;
final int pos = position;
final Data items = data.get(pos);
vi = inflater.inflate(R.layout.list_row, null);
checkBox = (CheckBox) vi.findViewById(R.id.cb);
menu = (TextView) vi.findViewById(R.id.nama_menu);
roll = (TextView) vi.findViewById(R.id.roll);
menu.setText(items.getMenu());
roll.setText(items.getRoll());
if (items.getRoll().equals(items.getRollBlocked())) {
checkBox.setChecked(true);
checkBoxState[position] = true;
items.setCheckbox(true);//maintaining boolean check status according to conditions
notifyDataSetChanged();
vi.setEnabled(false);
}
else if (items.getRoll().equals(items.getRollLate())) {
checkBox.setChecked(true);
checkBoxState[position] = true;//maintaining boolean check status according to conditions
items.setCheckbox(true);
notifyDataSetChanged();
vi.setEnabled(false);
}
else if (items.getRoll().equals(items.getRollCheck())) {
checkBox.setChecked(true);
checkBoxState[position] = true;
items.setCheckbox(true);//maintaining boolean check status according to conditions
} else if (items.getRollBlocked().equals("-")&& items.getRollCheck().equals("-") && items.getRollLate().equals("-")) {
checkBox.setChecked(false);
items.setCheckbox(false);
checkBoxState[position] = false;//maintaining boolean check status according to conditions
}
checkBox.setChecked(checkBoxState[position]);//checkbox is finally checked depending upon the local boolean array which u just created according to ur needs
vi.setTag(checkBox);
vi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
final Data items = data.get(pos);
cb = (CheckBox) v.getTag();
if(items.getRoll().equals(items.getRollBlocked())){
if(((CheckBox)v).isChecked()) {
checkBoxState[position] = true; //explicitly making it true
vi.setEnabled(false);
cb.setChecked(true);
}
else {
checkBoxState[position] = false;//explicitly making it false
}
}
else if(items.getRoll().equals(items.getRollLate())){
if(((CheckBox)v).isChecked()) {
checkBoxState[position] = true; //explicitly making it true
vi.setEnabled(false);
cb.setChecked(true);
}
else {
checkBoxState[position] = false;//explicitly making it false
}
}
else if(items.getRoll().equals(items.getRollCheck())){
if(((CheckBox)v).isChecked()) {
checkBoxState[position] = true; //explicitly making it true
cb.setChecked(false);
items.setCheckbox(false);
}
else {
cb.setChecked(true);
items.setCheckbox(true);
checkBoxState[position] = false;//explicitly making it false
}
}else if (items.getRollBlocked().equals("-") && items.getRollCheck().equals("-") && items.getRollLate().equals("-")){
if(((CheckBox)v).isChecked()) {
checkBoxState[position] = true; //explicitly making it true
cb.setChecked(false);
items.setCheckbox(false);
}
else {
cb.setChecked(true);
items.setCheckbox(true);
checkBoxState[position] = false;//explicitly making it false
}
}else{
}
}
});
return vi;
}
public ArrayList<Data> getAllData(){
return data;
}
}
Logcat:
FATAL EXCEPTION: main
Process: , PID: 1366
java.lang.ArrayIndexOutOfBoundsException: length=0; index=0
at com.mark_attendance.list.adapter.Adapter.getView(Adapter.java:78)
at android.widget.AbsListView.obtainView(AbsListView.java:2360)
at android.widget.ListView.measureHeightOfChildren(ListView.java:1326)
at android.widget.ListView.onMeasure(ListView.java:1233)
at android.view.View.measure(View.java:19731)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1391)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19731)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:687)
at android.view.View.measure(View.java:19731)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2271)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1358)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1607)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1246)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6301)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:871)
at android.view.Choreographer.doCallbacks(Choreographer.java:683)
at android.view.Choreographer.doFrame(Choreographer.java:619)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:857)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)
数据.java
public class Data {
private String roll;
private String menu;
private boolean check;
private String roll_check;
private String roll_blocked;
private String roll_late;
private String studentID;
private int blockedposition;
private int blockedposition2;
public Data() {}
public Data(String roll,String menu, boolean check,String roll_check,int blockedposition,String roll_blocked,int blockedposition2,String roll_late,String studentID) {
this.roll=roll;
this.menu = menu;
this.check = check;
this.roll_check = roll_check;
this.blockedposition=blockedposition;
this.blockedposition2=blockedposition2;
this.roll_blocked=roll_blocked;
this.roll_late=roll_late;
this.studentID=studentID;
}
public String getRoll() {
return roll;
}
public void setRoll(String roll) {
this.roll = roll;
}
//-----------------------Studentid---------------------------------------
public String getStudentID() {
return studentID;
}
public void setStudentID(String studentID) {
this.studentID = studentID;
}
//--------------------------------------
//------------------------------------------------------------
public int getBlockedPosition() {
return blockedposition;
}
public void setBlockedPosition(int blockedposition) {
this.blockedposition = blockedposition;
}
//------------------------------------------------------------
//------------------------------------------------------------
public int getBlockedPosition2() {
return blockedposition2;
}
public void setBlockedPosition2(int blockedposition2) {
this.blockedposition2 = blockedposition2;
}
//------------------------------------------------------------
public String getRollCheck() {
return roll_check;
}
public void setRollCheck(String roll_check) {
this.roll_check = roll_check;
}
//------------------------------------------------------------
public String getRollBlocked() {
return roll_blocked;
}
public void setRollBlocked(String roll_blocked) {
this.roll_blocked = roll_blocked;
}
//-----------------------LATE-----------------------------------------------------
public String getRollLate() {
return roll_late;
}
public void setRollLate(String roll_late) {
this.roll_late = roll_late;
}
//--------------------------------------------------------------------------
public String getMenu() {
return menu;
}
public void setMenu(String menu) {
this.menu = menu;
}
public boolean isCheckbox() {
return check;
}
public void setCheckbox(boolean check) {
this.check = check;
}
}
推荐答案
在适配器类中覆盖此方法
override this method in adapter class
@Override
public int getItemViewType(int position) {
return position;
}
这篇关于滚动列表视图BaseAdapter上CheckBox的选中/未选中状态更改的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
