Question

当我在listview中有更多项目时，我选择了一些复选框并向下滚动以选择更多复选框，然后在上面选中的复选框取消选择。

Plz帮助。在哪里我可以保存检查状态和位置，当我做刷新列表。代码如下。

     protected void onCreate(Bundle savedInstanceState) {

     dladapter = new DifferenceListAdapter(this,
                prodCodeArr, prodDescArr, serialBatchArr, expDtArr, qtyArr, serialNo, 0);
        diffeneceLv.setAdapter(dladapter);}

     static class ViewHolder {
    TextView srNotv, prodCodetv, prodDesctv, serialBatchNotv, expDatetv, qtytv;
    CheckBox consCheckBox;
}

     public class DifferenceListAdapter extends BaseAdapter{        
    Context c;
    String[] prodCode, prodDesc, expDate, qty, serialNo, serialBatchNo;
    //TextView srNotv, prodCodetv, prodDesctv, serialBatchNotv, expDatetv, qtytv;
    EditText consumedEt, disputeEt, OTCEt, patientnameEt;
    //final ArrayList<String> chkList = new ArrayList<String>();
    ArrayList<Boolean> chkState;
    //CheckBox consCheckBox;
    private boolean checked = false;
    ViewHolder viewHolder;
    View row;
    int f=0;


public DifferenceListAdapter(Context c, String[] prodCode, String[] prodDesc, String[] serialBatchNo, String[] expDate, String[] qty, String[] serialNo, int f){


        this.c = c;
        this.prodCode= prodCode;
        this.prodDesc= prodDesc;
        this.serialBatchNo= serialBatchNo;
        this.expDate = expDate;
        this.qty=qty;
        this.serialNo= serialNo;
        this.f= f;



        chkState = new ArrayList<Boolean>();

    }

public String[] getChecked(){


    return chkList.toArray(new String[chkList.size()]);
}   

    public int getCount() {
        // TODO Auto-generated method stub
        return prodCode.length;
    }

    public Object getItem(int arg0) {
        // TODO Auto-generated method stub

        return serialBatchNo[arg0];
    }

    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }
    public CheckBox getCheckBox() {
        return viewHolder.consCheckBox;
    }

    public void toggleChecked() {
        checked = !checked;

    }

    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

        final int p= position;
        //if (convertView == null) {
        viewHolder=new ViewHolder();
        LayoutInflater inflater= (LayoutInflater) c.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row= inflater.inflate(R.layout.consumedstockitemrow, null);     
        viewHolder.consCheckBox = (CheckBox) row.findViewById(R.id.conschkbx);
        viewHolder.srNotv=(TextView) row.findViewById(R.id.rowcdiffSrNoTv);
        viewHolder.prodCodetv=(TextView) row.findViewById(R.id.rowcdiffProductCodeTv);
        viewHolder.prodDesctv=(TextView) row.findViewById(R.id.rowcdiffProdDescTv);
        viewHolder.serialBatchNotv=(TextView) row.findViewById(R.id.rowcdiffSerialBatchTv);
        viewHolder.expDatetv=(TextView) row.findViewById(R.id.rowcdiffExpDtTv);
        viewHolder.qtytv=(TextView) row.findViewById(R.id.rowcdiffQtyTv);

        viewHolder.consCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub
                 CheckBox cb = (CheckBox) buttonView;

                    if(cb.isChecked()== true)
                    {


                        if(chkList.contains(serialBatchNo[p]))
                        {

                        }
                        else
                        {
                        chkList.add(serialBatchNo[p]);
                        }

                    }
                    else
                    {

                        if(chkList.contains(serialBatchNo[p]))
                        {
                            chkList.remove(serialBatchNo[p]);
                        }


                    }

            }
        });


        viewHolder.srNotv.setText(String.valueOf(p+1));
        viewHolder.prodCodetv.setText(prodCode[p].toString());
        viewHolder.prodDesctv.setText(prodDesc[p].toString());
        viewHolder.serialBatchNotv.setText(serialBatchNo[p].toString());
        viewHolder.expDatetv.setText(expDate[p].toString());
        viewHolder.qtytv.setText(qty[p].toString());



        return row;
    }

}

Answer 1

只需覆盖适配器的getView方法：

    @Override
    public View getView(final int position, View convertView, ViewGroup parent)
    {
        if (convertView == null)
        {
            convertView = inflater.inflate(R.layout.row, parent, false);
            wrapper = new YourWrapper(convertView);
            convertView.setTag(wrapper);
        }
        else
        {
            wrapper = (YourWrapper) convertView.getTag();
        }

        wrapper.getChecker().setOnCheckedChangeListener(
                new OnCheckedChangeListener()
                {
                    @Override
                    public void onCheckedChanged(CompoundButton buttonView,
                            boolean isChecked)
                    {
                        // Get the position that set for the checkbox using setTag.
                        int getPosition = (Integer) buttonView.getTag();
                        // Set the value of checkbox to maintain its state.
                        list.get(getPosition).setCheck(buttonView.isChecked());
                    }
                });
        wrapper.getChecker().setTag(position);
        wrapper.getTags().setText(list.get(position).getTitle());
        wrapper.getChecker().setChecked(list.get(position).getCheck());

        return convertView;
    }

Answer 2

下面是我用于

的工作代码

在列表视图中显示带有数组适配器的复选框。

<强> MainActivity.java

package com.rdc.activity;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

    private ListView mainListView = null;
    private Planet[] planets = null;
    private ArrayAdapter<Planet> listAdapter = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        mainListView = (ListView) findViewById(R.id.mainListView);

        // When item is tapped, toggle checked properties of 
            //   CheckBox and Planet.

        mainListView.setOnItemClickListener(new
                         AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View item,
            int position, long id) {
        Planet planet = listAdapter.getItem(position);
        planet.toggleChecked();
        PlanetViewHolder viewHolder = 
                           (PlanetViewHolder) item
               .getTag();
                viewHolder.getCheckBox()
                     .setChecked(planet.isChecked());
                }
                });

        // Create and populate planets.
        planets = (Planet[]) getLastNonConfigurationInstance();
        if (planets == null) {
            planets = new Planet[] { new Planet("Mercury"),
                    new Planet("Venus"), new Planet("Earth"),
                    new Planet("Mars"), new Planet("Jupiter"),
                    new Planet("Saturn"), new Planet("Uranus"),
                    new Planet("Neptune"), new Planet("Ceres"),
                    new Planet("Pluto"), new Planet("Haumea"),
                    new Planet("Makemake"), new Planet("Eris") };
        }
        ArrayList<Planet> planetList = new ArrayList<Planet>();
        planetList.addAll(Arrays.asList(planets));

        // Set our custom array adapter as the ListView's adapter.
        listAdapter = new PlanetArrayAdapter(this, planetList);
        mainListView.setAdapter(listAdapter);
    }

    /** Holds planet data. */
    private static class Planet {
        private String name = "";
        private boolean checked = false;

        public Planet() {
        }

        public Planet(String name) {
            this.name = name;
        }

        public Planet(String name, boolean checked) {
            this.name = name;
            this.checked = checked;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public boolean isChecked() {
            return checked;
        }

        public void setChecked(boolean checked) {
            this.checked = checked;
        }

        public String toString() {
            return name;
        }

        public void toggleChecked() {
            checked = !checked;
        }
    }

    /** Holds child views for one row. */
    private static class PlanetViewHolder {
        private CheckBox checkBox;
        private TextView textView;

        public PlanetViewHolder() {
        }

        public PlanetViewHolder(TextView textView, CheckBox checkBox) {
            this.checkBox = checkBox;
            this.textView = textView;
        }

        public CheckBox getCheckBox() {
            return checkBox;
        }

        public void setCheckBox(CheckBox checkBox) {
            this.checkBox = checkBox;
        }

        public TextView getTextView() {
            return textView;
        }

        public void setTextView(TextView textView) {
            this.textView = textView;
        }
    }

    /** Custom adapter for displaying an array of Planet objects. */
    private static class PlanetArrayAdapter extends ArrayAdapter<Planet> {

        private LayoutInflater inflater;

        public PlanetArrayAdapter(Context context, List<Planet> planetList) {
            super(context, R.layout.simplerow, R.id.rowTextView, planetList);
            // Cache the LayoutInflate to avoid asking for a new one each time.
            inflater = LayoutInflater.from(context);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            Planet planet = (Planet) this.getItem(position);
            CheckBox checkBox;
            TextView textView;

            // Create a new row view
            if (convertView == null) {
                convertView = inflater.inflate(R.layout.simplerow, null);

                textView = (TextView) convertView
                        .findViewById(R.id.rowTextView);
                checkBox = (CheckBox) convertView.findViewById(R.id.CheckBox01);

                convertView.setTag(new PlanetViewHolder(textView, checkBox));

                // If CheckBox is toggled, update the planet it is tagged with.
                checkBox.setOnClickListener(new View.OnClickListener() {
                    public void onClick(View v) {
                        CheckBox cb = (CheckBox) v;
                        Planet planet = (Planet) cb.getTag();
                        planet.setChecked(cb.isChecked());
                    }
                });
            }
            // Re-use existing row view
            else {

                PlanetViewHolder viewHolder = (PlanetViewHolder) convertView
                        .getTag();
                checkBox = viewHolder.getCheckBox();
                textView = viewHolder.getTextView();
            }

            // Tag the CheckBox with the Planet it is displaying, so that we can
            // access the planet in onClick() when the CheckBox is toggled.
            checkBox.setTag(planet);

            // Display planet data
            checkBox.setChecked(planet.isChecked());
            textView.setText(planet.getName());

            return convertView;
        }

    }

    public Object onRetainNonConfigurationInstance() {
        return planets;
    }
}

main.xml （用于列表视图）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <ListView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:id="@+id/mainListView">
    </ListView>

</LinearLayout>

simplerow.xml （对于列表视图＆＃39; s行）

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <TextView
        android:id="@+id/rowTextView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:textSize="16sp">
    </TextView>

    <CheckBox
        android:id="@+id/CheckBox01"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:layout_alignParentRight="true"
        android:layout_marginRight="6sp"
        android:focusable="false">
    </CheckBox>

</RelativeLayout>

以下是结果屏幕 ..

enter image description here

如果您对此仍有任何疑问，请与我们联系！

这是complete tutorial

Answer 3

我找到了一些解决方法不是最好的，而是做他的工作如果视图（CheckBox）不再可见，它在checkBox监听器上执行的操作它不能改变复选框状态所以当你滚动它不会取消选中你的复选框仍然需要提供选中复选框的位置列表并在getView设置状态的复选框

@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

    if(buttonView.isShown()) // chek if checkbox is visible 
    {
        int position = buttonView.getId();  // get position of check box 
        _selected[position] = buttonView.isChecked(); // set true or false  in list of seleted checkboxes 

    }

}

getView看起来像这样

 @Override
public View getView(int position, View convertView, ViewGroup parentView) {

    View view = convertView;
    if (view == null) {
        LayoutInflater inflater = activity.getLayoutInflater();
        view = inflater.inflate(R.layout.layout, null);
        ViewHolder viewHolder = new ViewHolder();
        viewHolder.tv = (TextView) rowView.findViewById(R.id.text);
        viewHolder.cb = (CheckBox) rowView.findViewById(R.id.check_box);
        viewHolder.cb.setOnCheckedChangeListener(this);
        view.setTag(viewHolder);
    }

    ViewHolder holder = (ViewHolder) view.getTag();
    holder.tv.setText("Text");
    holder.cb.setChecked(_selected[position]); //Geting state of check box from array
    holder.cb.setId(position); // set check box ID(position in adapter)

    return view;


}

ViewHolder

class ViewHolder
{
    TextView tv;
    CheckBox cb;

}

Answer 4

无论你在BaseAdapter中返回getItem的对象是什么，都要确保在每个项目上取一个未选中的布尔对象。对于每个选中的项目，你可以设置check boolean true..and在getView中检查项目是否为检查比检查复选框。

Answer 5

我有一个解决您问题的方法。在我的项目中，我使用自定义适配器扩展基础适配器，在getview方法中使用此代码：

public View getView(final int position, View convertView,
                ViewGroup parent) {

        if (convertView == null) {

            LayoutInflater li = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = li.inflate(R.layout.contact_row, null);

        }

        TextView tv_name = (TextView) convertView
                .findViewById(R.id.contactnameid);
        TextView tv_no = (TextView) convertView
                .findViewById(R.id.contactnoid);

        tv_name.setText(names[position]);
        tv_no.setText(numbers[position]);

        final CheckBox ch_bx = (CheckBox) convertView
                .findViewById(R.id.contactchkboxid);

        ch_bx.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub

                CheckBox ch = (CheckBox) v
                        .findViewById(R.id.contactchkboxid);

                if (ch.isChecked()) {
                    itemchecked.set(position, true);
                    Final_SMS_Nos.add(numbers[position]);
                    Log.v("SMS No adding", "" + Final_SMS_Nos);

                } else if (!ch.isChecked()) {
                    itemchecked.set(position, false);
                    Final_SMS_Nos.remove(numbers[position]);
                    Log.v("SMS No deleting", "" + Final_SMS_Nos);
                }

            }
        });

        ch_bx.setChecked(itemchecked.get(position));

        return convertView;

    }

Answer 6

尝试将library(lubridate) library(dplyr) library(tibble) d <- tibble("ID" = 1:9, "Date1" = as_date(c("2019-08-05", "2019-08-26", "2019-08-26", "2019-08-26", "2019-07-29", "2019-08-12", "2019-08-19", "2019-08-26", "2019-08-26")), "Date2" = as_date(c("2019-08-12", "2019-09-02", "2019-09-02", "2019-09-02", "2019-08-05", "2019-08-19", "2019-08-26", "2019-09-02", "2019-09-02"))) d %>% select("Date1") %>% replace(. > today(), NA) #This line doesn't work放在setChecked()之后。

当我滚动自定义列表视图时，复选框被取消选中

6 个答案:

在列表视图中显示带有数组适配器的复选框。

当我滚动自定义列表视图时，复选框被取消选中

6 个答案:

在列表视图中显示带有数组适配器的复选框 。

在列表视图中显示带有数组适配器的复选框。