Select only one checkbox

问题

I have a multiple checkboxes, but I want user to select one checkbox only. I try if-else statement but it is not useable. So, I want to know, how to be like that.

Thanks

回答1:

Why don't you use Radio Buttons instead? They are meant exactly for that.

But if you insist on using check boxes, modify the event of on select of any check box such that when it is selected it disables the other check boxes.

回答2:

I made this:

public void check_checkbox(){

    int CB_count=0;
    if (CB_1.isChecked()) {
        CB_count=CB_count+1;
    }if (CB_2.isChecked()) {
        CB_count=CB_count+1;
    }if (CB_3.isChecked()) {
            CB_count=CB_count+1;}

        if (CB_count == 1) {

            //do your magic

        } else {
            Toast.makeText(getActivity(), "you only can select 1 checkbox", Toast.LENGTH_SHORT).show();
        }
}

I improve it, on the onCreateView=

CB_1.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if (b) {
                    CB_2.setChecked(false);
                    CB_3.setChecked(false);
                }
            }
        });
        CB_2.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if (b) {
                    CB_1.setChecked(false);
                    CB_3.setChecked(false);
                }
            }
        });
        CB_3.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                if (b) {
                    CB_2.setChecked(false);
                    CB_1.setChecked(false);
                }
            }
        });

回答3:

I did this:

- In my layout:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:alignmentMode="alignBounds"
    android:columnCount="1"
    android:background="#ff99f6ff"
  >

    <ImageView
        android:id="@+id/escudo"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_gravity="center_horizontal|fill_vertical"
        android:src="@drawable/dicon2"
        android:contentDescription="foto logo"
        android:layout_marginTop="30dp"
        android:layout_alignParentTop="false"
        android:layout_centerInParent="true" />

    <Button
        style="?android:attr/buttonStyleSmall"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Button"
        android:id="@+id/button"
        android:layout_gravity="top"
        android:layout_below="@+id/radioGroup"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="48dp" />

    <RadioGroup
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/radioGroup"
        android:orientation="horizontal"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_marginTop="34dp"
        android:gravity="center_horizontal"
        android:checkedButton="1"
        >

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/check_a"
            android:id="@+id/checkBoxA"
            android:layout_above="@+id/escudo"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:onClick="onCheckboxClicked" />

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/check_b"
            android:id="@+id/checkBoxB"
            android:layout_alignTop="@+id/checkBoxA"
            android:layout_toRightOf="@+id/checkBoxA"
            android:layout_toEndOf="@+id/checkBoxA"
            android:onClick="onCheckboxClicked"/>

        <CheckBox
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/check_c"
            android:id="@+id/checkBoxC"
            android:layout_alignTop="@+id/checkBoxB"
            android:layout_toRightOf="@+id/checkBoxB"
            android:layout_toEndOf="@+id/checkBoxB"
            android:onClick="onCheckboxClicked"/>

    </RadioGroup>
</RelativeLayout>


import android.support.v7.app.ActionBarActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.CheckBox;

public class MainActivity extends ActionBarActivity {

    private CheckBox checkBoxA, checkBoxB, checkBoxC;

    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        checkBoxA = (CheckBox) findViewById(R.id.checkBoxA);
        checkBoxB = (CheckBox) findViewById(R.id.checkBoxB);
        checkBoxC = (CheckBox) findViewById(R.id.checkBoxC);
    }

    public void onCheckboxClicked(View view) {

        switch(view.getId()) {

            case R.id.checkBoxA:

                    checkBoxB.setChecked(false);
                    checkBoxC.setChecked(false);

                break;

            case R.id.checkBoxB:

                    checkBoxC.setChecked(false);
                    checkBoxA.setChecked(false);

                break;

            case R.id.checkBoxC:

                    checkBoxA.setChecked(false);
                    checkBoxB.setChecked(false);

                break;
        }
    }
}

来源：https://stackoverflow.com/questions/4844190/select-only-one-checkbox