如何在android中处理checkbox ischecked和unchecked事件

How to Handle the checkbox ischecked and unchecked event in android

提问by Zala Janaksinh

i am new in android.i make a simple maths apps. i use the check box for select right option but problem is here the answer option is not only one but also two,three means multi select so i use the check box

我是 android.i 的新手。我制作了一个简单的数学应用程序。我使用复选框选择正确的选项，但问题是这里的答案选项不仅是一个而且是两个，三个意味着多选，所以我使用复选框

chkOption.setOnCheckedChangeListener(this);

event and try to handle this.and store the select value in one Arraylist.but when i select option the value is add in arrayList but when i do uncheck(Diselect) then also the event is occur and the value add in arraylist. my code is below

事件并尝试处理此事件。并将选择值存储在一个 Arraylist 中。但是当我选择选项时，该值将添加到 arrayList 中，但是当我取消选中（Diselect）时，也会发生该事件，并将值添加到 arraylist 中。我的代码在下面

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    {   
        CheckBox chk=(CheckBox) buttonView;
        if(chk.isChecked())
        {
            forMetchCheckBox.add(String.valueOf(chk.getText()));            
        }
    }   

forMetchCheckbow is my String ArrayList .So i can what to do? How to Handle this problem. if any user deselect the option then the checkbox select value is remove from ArrayList.it`s possible?

forMetchCheckbow 是我的 String ArrayList 。所以我该怎么办？如何处理这个问题。如果任何用户取消选择该选项，则复选框选择值将从 ArrayList 中删除。这可能吗？

回答by Lalit Poptani

It seems you are having more than one checkbox and you are setting global listener for every checkbox. So, in that case you need to identify the event for specific checkbox also.

似乎您有多个复选框，并且您正在为每个复选框设置全局侦听器。因此，在这种情况下，您还需要确定特定复选框的事件。

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked)
    {   
        int id = buttonView.getId();
        if(id == R.id.chk)
        {
          if(chk.isChecked()){
               forMetchCheckBox.add(String.valueOf(chk.getText()));
            }
           else{
               forMetchCheckBox.remove(String.valueOf(chk.getText()));
           }
        }
        else if(id == R.id.chk1){
           ....
        }
    }  

and so on, that will make your listener work perfect.

等等，这将使您的听众工作完美。

回答by Android

chk.setOnCheckedChangeListener(new OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                // TODO Auto-generated method stub

                      if(isChecked){
                          chetimeslot = (String)chk.getTag();
                            checkbox_timeslot.add(chetimeslot);

                        }
                       else{
                           chetimeslot = (String)chk.getTag();
                            checkbox_timeslot.remove(chetimeslot);


                       }

});

回答by ranjan

To Select Maximum 5 Checkbox at one Time or Count selected and unselected checkbox in Custom listview with CheckBox

一次选择最多 5 个复选框或使用 CheckBox 在自定义列表视图中计算选中和未选中的复选框

     package com.test;

 import java.util.ArrayList;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.ListActivity;
 import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;


public class ListViewCheckboxesActivity extends ListActivity {

    AlertDialog alertdialog = null;
    int i1, i2, i3 = 0;
    Country rowcheck;
    MyCustomAdapter dataAdapter = null;
    ListView listView = null;
    int k = 1;

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

        // Generate list View from ArrayList
        displayListView();
        checkButtonClick();

    }

    private void displayListView() {

        // Array list of countries Equipments
        ArrayList<Country> rowcheckList = new ArrayList<Country>();
        Country rowcheck = new Country("", "Hex Bolts", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Hex Cap Screw", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Round Head Bolt", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Slotted Head Hex Bolt", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Socket Cap Screw", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Sockets", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Square Head Bolt", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Carriage Bolt", false);
        rowcheckList.add(rowcheck);
        rowcheck = new Country("", "Plow Bolt", false);
        rowcheckList.add(rowcheck);

        rowcheck = new Country("", "Struts Clamp", false);
        rowcheckList.add(rowcheck);

        listView = getListView();

        dataAdapter = new MyCustomAdapter(this, R.layout.rowcheck_info,
                rowcheckList);

        // Assign adapter to ListView
        listView.setAdapter(dataAdapter);

        listView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView parent, View view,
                    int position, long id) {
                // When clicked, show a toast with the TextView text
                Country rowcheck = (Country) parent.getItemAtPosition(position);

            }

        });

    }

    private class MyCustomAdapter extends ArrayAdapter<Country> {
        private ArrayList<Country> rowcheckList;

        public MyCustomAdapter(Context context, int textViewResourceId,
                ArrayList<Country> rowcheckList) {
            super(context, textViewResourceId, rowcheckList);
            this.rowcheckList = new ArrayList<Country>();
            this.rowcheckList.addAll(rowcheckList);
        }

        private class ViewHolder {
            TextView code;
            CheckBox name;
        }

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

   ViewHolder holder = null;
   Log.v("ConvertView", String.valueOf(position));

   if (convertView == null) 
   {
   LayoutInflater vi = (LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
   convertView = vi.inflate(R.layout.rowcheck_info, null);

   holder = new ViewHolder();
   holder.code = (TextView) convertView.findViewById(R.id.code);
   holder.name = (CheckBox) convertView.findViewById(R.id.checkBox1);
   convertView.setTag(holder);

    holder.name.setOnClickListener( new View.OnClickListener()
    { 
     public void onClick(View v) 
     { 
      CheckBox cb = (CheckBox) v ; 
      Country rowcheck = (Country) cb.getTag(); 

      //To check maximum 5 Selection
      if(k>5)
      {

          if(!cb.isChecked())
          {


                  rowcheck.selected=true;
                  System.out.println(k--);


           }

          else
          {
              System.out.println("if block in-----");
              cb.setChecked(false);
              Toast.makeText(getApplicationContext(), "Maximum Selection", Toast.LENGTH_LONG).show();
          }


      }

      else
      {

          System.out.println("else block in-----");

          if(!cb.isChecked())
          {


                  rowcheck.selected=true;
                  System.out.println(k--);

           }


          else if(cb.isChecked())
          {


                     rowcheck.selected=false;
                     System.out.println(k++);



          }

      }





     Toast.makeText(getApplicationContext(),
       "Clicked on Checkbox: " + cb.getText() +
       " is " + cb.isChecked(),
       Toast.LENGTH_LONG).show()
       rowcheck.setSelected(cb.isChecked());
     } 
    }); 
   }
   else 
   {
    holder = (ViewHolder) convertView.getTag();
   }

   Country rowcheck = rowcheckList.get(position);
  // holder.code.setText(" (" +  rowcheck.getCode() + ")");
   holder.code.setText(rowcheck.getName());
  // holder.name.setText(rowcheck.getName());
   holder.name.setChecked(rowcheck.isSelected());
   holder.name.setTag(rowcheck);

   return convertView;

  }
    }

    private void checkButtonClick() {

        Button myButton = (Button) findViewById(R.id.findSelected);
        myButton.setOnClickListener(new OnClickListener() {
            public void onClick(View v) {
                StringBuffer responseText = new StringBuffer();
                responseText.append("The following were selected...\n");

                ArrayList<Country> rowcheckList = dataAdapter.rowcheckList;

                System.out.println("Size" + rowcheckList.size());
                int j = 0;
                ArrayList<String> stt = new ArrayList<String>();
                for (int i = 0; i < rowcheckList.size(); i++) {
                    Country rowcheck = rowcheckList.get(i);
                    // System.out.println(rowcheck.getName());

                    if (rowcheck.isSelected()) {
                        stt.add(rowcheck.getName());
                        // Country.st=new ArrayList<String>();
                        String s = rowcheck.getName();
                        System.out.println("String--" + rowcheck.getName());
                        Country.st.add(s);
                        j = j++;
                        System.out.println(j++);

                        responseText.append("\n" + rowcheck.getName());

                    }

                }
                for (int i = 0; i < stt.size(); i++) {
                    System.out.println("Names----" + stt.get(i).toString());
                }

                if (j >= 1 && j <= 5) {

                    Intent i = new Intent(ListViewCheckboxesActivity.this,
                            PickedItemListView.class);
                    i.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(i);
                } else {
                    Toast.makeText(ListViewCheckboxesActivity.this,
                            "Maximum 5 Selection Allowed", Toast.LENGTH_LONG)
                            .show();
                }

                Toast.makeText(ListViewCheckboxesActivity.this, responseText,
                        Toast.LENGTH_LONG).show();

            }
        });

    }
//Logout ALert Box
    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {

            LayoutInflater inflater = LayoutInflater
                    .from(ListViewCheckboxesActivity.this);
            View dialogview = inflater.inflate(R.layout.logout_popup, null);
            final Button ok = (Button) dialogview.findViewById(R.id.ok);
            final Button cancel = (Button) dialogview.findViewById(R.id.cancel);
            AlertDialog.Builder dialogbuilder = new AlertDialog.Builder(
                    (ListViewCheckboxesActivity.this));
            dialogbuilder.setView(dialogview);
            dialogbuilder.setInverseBackgroundForced(true);
            alertdialog = dialogbuilder.create();
            alertdialog.show();

            ok.setOnClickListener(new OnClickListener() {

                public void onClick(View paramView) {
                    alertdialog.dismiss();
                    final Intent intent = new Intent(
                            ListViewCheckboxesActivity.this,
                            LoginActivity.class);
                    intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(intent);
                    finish();
                }

            });

            cancel.setOnClickListener(new OnClickListener() {

                public void onClick(View paramView) {
                    alertdialog.cancel();
                }
            });

        }
        return super.onKeyDown(keyCode, event);
    }

}

回答by Stefano Ortisi

What's wrong is your if condition. It should be:

有什么问题是你的 if 条件。它应该是：

if( isChecked ) 

and not

并不是

if( chk.isChecked() )

回答by Dmitriy Shkregal

checkBox_sound.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {

            varBoolSoundOn = (isChecked) ? true : false;

        }
    });

It works Perfect...

它工作完美...