How to set a radio button in Android

问题

I have an app that uses radio buttons. The default for this button is set in the main.xml file, ie:

android:id="@+id/rb_sat1E"
android:checked="true"

In the Java file I have:

final RadioButton radio1 = (RadioButton)findViewById(R.id.rb_sat1E);

I have also created a 'Reset' button in the main Java file and can use the following code to reset TextView information ie.

pos1_deg.setText("0.0");

But how do I reset a radio button? I would have thought it to be something like

radio1.setBoolean("TRUE");

But that does not work at all.

Any help greatly appreciated. Thanks.

回答1:

For radioButton use

radio1.setChecked(true);

It does not make sense to have just one RadioButton. If you have more of them you need to uncheck others through

radio2.setChecked(false); ...

If your setting is just on/off use CheckBox.

回答2:

If you want to do it in code, you can call the check member of RadioGroup:

radioGroup.check(R.id.radioButtonId);

This will check the button you specify and uncheck the others.

回答3:

Or you can do it in the XML file :

In the RadioGroup using : android:checkedButton="id_button_to_check"

or in the RadioButton : android:checked="true"

回答4:

Just to clarify this: if we have a RadioGroup with several RadioButtons and need to activate one by index, implies that:

radioGroup.check(R.id.radioButtonId)

and

radioGroup.getChildAt(index)`

We can to do:

radioGroup.check(radioGroup.getChildAt(index).getId());

回答5:

if you have done the design in XML and want to show one of the checkbox in the group as checked when loading the page below solutions can help you

    <RadioGroup
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtLastNameSignUp"
        android:layout_margin="20dp"
        android:orientation="horizontal"
        android:id="@+id/radioGroup">
<RadioButton
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:checked="true"
    android:id="@+id/Male"
    android:text="Male"/>
        <RadioButton
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:id="@+id/Female"
            android:text="Female"/>
        </RadioGroup>

回答6:

Many times if your radio buttons belong to the same radioGroup then

radioButton.setChecked(true)

will not select the radio button properly. So to solve this problem try using your radioGroup.

radioGroup.check(R.id.radioButtonId)

回答7:

I have multiple RadioButtons without Group and setChecked(true) works, but setChecked(false) don't works. But this code works:

RadioButton switcher = (RadioButton) view.findViewById(R.id.active);
                        switcher.setOnClickListener(new RadioButton.OnClickListener(){
                            @Override
                            public void onClick(View v) {
                                if(((RadioButton)v).isSelected()){
                                    ((RadioButton)v).setChecked(false);
                                    ((RadioButton)v).setSelected(false);
                                } else {
                                    ((RadioButton)v).setChecked(true);
                                    ((RadioButton)v).setSelected(true);
                                }
                            }

                        });

回答8:

btnDisplay.setOnClickListener(new OnClickListener() {

    @Override
    public void onClick(View v) {

            // get selected radio button from radioGroup
        int selectedId = radioSexGroup.getCheckedRadioButtonId();

        // find the radiobutton by returned id
            radioSexButton = (RadioButton) findViewById(selectedId);

        Toast.makeText(MyAndroidAppActivity.this,
            radioSexButton.getText(), Toast.LENGTH_SHORT).show();

    }

});

来源：https://stackoverflow.com/questions/4134582/how-to-set-a-radio-button-in-android

标签

android

radio-button