我有列表视图，其中包含一些预先选中的复选框。当我使用取消选中已选中的复选框并再次滚动它时，它会被检查，如果我选中未选中复选框，则滚动它，它会更改为未选中状态。
当我
选中该复选框，然后滚动它，取消选中
取消选中预先选中的复选框并滚动它，它会被检查
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的：
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;
}
}
答案 0 :(得分：0)
尝试这样做，请阅读评论，因为我试图详细解释： 在您的数据类中，只需添加此布尔标志，该标志将成为已检查或未选中的主要标志：
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;
public boolean isBoolStorage() {
return boolStorage;
}
public void setBoolStorage(boolean boolStorage) {
this.boolStorage = boolStorage;
}
private boolean boolStorage;//Boolean flag is maintained at object level with getters and setters
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;
}
}
现在根据你的条件修改你的数据集，运行一个基本的for-each循环，并根据你的条件设置布尔状态： 假设你的数据集是ArrayList数据;
循环遍历数据集并在条件成功的任何地方放置布尔标志
for(Data data :datas){
if (data.getRoll().equals(data.getRollBlocked())) {
data.setBoolStorage(true);//setting flags to true and false respectively according to conditions and modifying basic data set before sending it to the adapter
}
else if (data.getRoll().equals(data.getRollLate())) {
data.setBoolStorage(true);
}
else if (data.getRoll().equals(data.getRollCheck())) {
data.setBoolStorage(true);
} else if (data.getRollBlocked().equals("-")&& data.getRollCheck().equals("-") && data.getRollLate().equals("-")) {
data.setBoolStorage(false);
}
}
//Now call ur adapter with modified data set
Adapter adapter = new Adapter(MainActivity.this,datas);
你的适配器类，U必须这样写：
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[data.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.isBoolStorage()) {
checkBox.setChecked(true);
checkBoxState[position] = true;
items.setCheckbox(true);//maintaining boolean check status according to conditions
vi.setEnabled(false);
}
else if (items.isBoolStorage()) {
checkBox.setChecked(true);
checkBoxState[position] = true;//maintaining boolean check status according to conditions
items.setCheckbox(true);
vi.setEnabled(false);
}
else if (items.isBoolStorage()) {
checkBox.setChecked(true);
checkBoxState[position] = true;
items.setCheckbox(true);//maintaining boolean check status according to conditions
} else if (!items.isBoolStorage()) {
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
items.setBoolStorage(true);// changing boolean flag of the object accordingly
vi.setEnabled(false);
cb.setChecked(true);
}
else {
items.setBoolStorage(false);
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
items.setBoolStorage(true);
vi.setEnabled(false);
cb.setChecked(true);
}
else {
items.setBoolStorage(false);
checkBoxState[position] = false;//explicitly making it false
}
}
else if(items.getRoll().equals(items.getRollCheck())){
if(((CheckBox)v).isChecked()) {
items.setBoolStorage(false);
checkBoxState[position] = false; //explicitly making it true
cb.setChecked(false);
items.setCheckbox(false);
}
else {
items.setBoolStorage(true);
cb.setChecked(true);
items.setCheckbox(true);
checkBoxState[position] = true;//explicitly making it true
}
}else if (items.getRollBlocked().equals("-") && items.getRollCheck().equals("-") && items.getRollLate().equals("-")){
if(((CheckBox)v).isChecked()) {
checkBoxState[position] = false; //explicitly making it true
items.setBoolStorage(false);
cb.setChecked(false);
items.setCheckbox(false);
}
else {
items.setBoolStorage(true);
cb.setChecked(true);
items.setCheckbox(true);
checkBoxState[position] = true;//explicitly making it false
}
}else{
}
}
});
return vi;
}
public ArrayList<Data> getAllData(){
return data;
}
答案 1 :(得分：0)
我会在尽可能少地更改您的代码时回答。此外，在您根据其他答案进行更改之前，我从您的上一次修订开始。
但是，您的逻辑可能存在一些问题。您希望根据项目的内容和用户输入来控制复选框。没关系，但你怎么知道使用哪个？我的回答使用内容，直到用户点击该项目，然后从该点开始是手动的。要在单击后返回使用内容，需要有一种方法来告诉视图返回使用内容。可能是你在vi.setEnabled()做的事情，我不确定。
1，将其添加到Data类。您可以重新使用已有的boolean变量，但为了安全起见，我只是创建了另一个变量。
// add these 4 lines near the top
public static int NO_MANUAL_CHECK = 1;
public static int MANUAL_CHECK_TRUE = NO_MANUAL_CHECK + 1;
public static int MANUAL_CHECK_FALSE = MANUAL_CHECK_TRUE + 1;
int manualCheck;
// and the getter & setter
public int isManualCheck() {
return manualCheck;
}
public void setManualCheck(int check) {
this.manualCheck = check;
}
这里是getView()方法，包括OnClickListener()。
@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.manualCheck == Data.NO_MANUAL_CHECK) {
if (items.getRoll().equals(items.getRollBlocked())) {
checkBox.setChecked(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);
items.setCheckbox(true);
notifyDataSetChanged();
//vi.setEnabled(false);
} else if (items.getRoll().equals(items.getRollCheck())) {
checkBox.setChecked(true);
items.setCheckbox(true);//maintaining boolean check status according to conditions
} else { /*** notice here I've changed this condition to account for unknown content of item ***/
checkBox.setChecked(false);
items.setCheckbox(false);
}
} else {
boolean manualChecked = (items.isManualCheck() == Data.MANUAL_CHECK_TRUE);
checkBox.setChecked(manualChecked);
}
vi.setTag(checkBox);
vi.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d("TAG", "pos = " + pos);
final Data items = data.get(pos);
cb = (CheckBox) v.getTag();
// toggle manual check
if(items.isManualCheck() == Data.MANUAL_CHECK_TRUE) {
items.setManualCheck(Data.MANUAL_CHECK_FALSE);
} else {
items.setManualCheck(Data.MANUAL_CHECK_TRUE);
}
// you don't need to do all the display logic again, just tell the Adapter & getView() will be called
notifyDataSetChanged();
}
});
return vi;
}
一般来说，有一些事情会以另一种方式做得更好。在getView()中，您每次都会对视图进行充气。有关更有效的方法，请参阅ListView。此外，将OnItemClickListener()用于ListView更常见。如果您使用ViewHolder作为ListView，那么onClickListener()会更好。无论如何，我不想在你的代码中做太多改变。我希望这能解决你的问题。
答案 2 :(得分：0)
尝试从checkBox.setChecked()子句中删除if并将其设置为checkBox.setChecked(items.getRoll().equals(items.getRollLate()))。它应该完成这项工作。
答案 3 :(得分：0)
我可以在您的代码中看到的问题是您没有以标准方式制作适配器。检查此代码，以这种方式制作适配器或更好地复制并粘贴您的代码。它会正常工作。
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;
import java.util.ArrayList;
/**
* Created by Zohaib Hassan on 11/28/2016.
*/
public class InboxAdapter extends ArrayAdapter<InboxRow> {
ArrayList<InboxRow> items;
Context context;
public InboxAdapter(Context context, int resource, ArrayList<InboxRow> items) {
super(context , resource , items);
this.context = context;
this.items = items;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// Get the data item for this position
InboxRow rowItem = getItem(position);
// Check if an existing view is being reused, otherwise inflate the view
ViewHolder viewHolder; // view lookup cache stored in tag
if (convertView == null) {
viewHolder = new ViewHolder();
LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(R.layout.inbox_row, null);
viewHolder.tvUserName = (TextView) convertView.findViewById(R.id.tv_user_name_inbox);
viewHolder.tvMessage = (TextView) convertView.findViewById(R.id.tv_message_inbox);
viewHolder.tvTimeCount = (TextView) convertView.findViewById(R.id.tv_time_count_inbox);
viewHolder.userProfilePic = (CircleImageView) convertView.findViewById(R.id.inbox_profile_image);
convertView.setTag(viewHolder);
} else {
viewHolder = (ViewHolder) convertView.getTag();
}
// Set Your data here!
return convertView;
}
private static class ViewHolder {
TextView tvUserName , tvMessage , tvTimeCount;
CircleImageView userProfilePic;
}
}
此适配器的主要部分是ViewHolder类，ViewHolder类将确保您的数据数组值不会相互混淆。
答案 4 :(得分：0)
在适配器类
中覆盖此方法@Override
public int getItemViewType(int position) {
return position;
}