Develop Reference

Radio Button checking and unchecking programmatically in android

My requirement is to be able to be able to check only 1 radio button from the no of options available.
My layout is simple
User should be able to select only one of p1, p2 and p3.
The IDs for for the buttons are rB1,rB2 and rB3.
PS: I know it is possible to achieve the same with RadioGroup , but in this particular instance I want to go with Radio Button hence the query

Try this..
r1.setOnCheckedChangeListener(this);
r2.setOnCheckedChangeListener(this);
r3.setOnCheckedChangeListener(this);
And CheckedChangeListener
#Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
if (isChecked) {
if (buttonView.getId() == R.id.rB1) {
r2.setChecked(false);
r3.setChecked(false);
}
if (buttonView.getId() == R.id.rB2) {
r1.setChecked(false);
r3.setChecked(false);
}
if (buttonView.getId() == R.id.rB3) {
r1.setChecked(false);
r2.setChecked(false);
}
}
}
and don't forget to implements OnCheckedChangeListener in your activity or fragment.

Try this way:
<RadioGroup
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="#+id/p1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P1" />
<RadioButton
android:id="#+id/p2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P2" />
<RadioButton
android:id="#+id/p3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P3" />
</RadioGroup>

Use Radio group
XML:
<RadioGroup
android:id="#+id/radiogroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="#+id/rB1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P1"
android:checked="true" />
<RadioButton
android:id="#+id/rB2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P2" />
<RadioButton
android:id="#+id/rB3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="P3" />
</RadioGroup>

try below code:-
java
public class MyAndroidAppActivity extends Activity {
private RadioGroup radioSexGroup;
private RadioButton radioSexButton;
private Button btnDisplay;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnButton();
}
public void addListenerOnButton() {
radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
btnDisplay = (Button) findViewById(R.id.btnDisplay);
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();
}
});
}
}
xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<RadioGroup
android:id="#+id/radioSex"
android:layout_width="wrap_content"
android:layout_height="wrap_content" >
<RadioButton
android:id="#+id/radioMale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/radio_male"
android:checked="true" />
<RadioButton
android:id="#+id/radioFemale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/radio_female" />
</RadioGroup>
<Button
android:id="#+id/btnDisplay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/btn_display" />
</LinearLayout>
for more detail see below link:-
http://www.mkyong.com/android/android-radio-buttons-example/
http://www.tutorialspoint.com/android/android_radiogroup_control.htm

The solution can be achieved by setting a android:onClick="onRadioButtonClick" in the layout.xml file and creating a onRadioButtonClick method in Activity.java
public void onRadioButtonClick(View v)
{
boolean checked = ((RadioButton) v).isChecked();
RadioButton r1 = (RadioButton) findViewById(R.id.rB1);
RadioButton r2 = (RadioButton) findViewById(R.id.rB2);
RadioButton r3 = (RadioButton) findViewById(R.id.rB3);
switch(v.getId()) {
case R.id.rB1:
if (checked){
r2.setChecked(false);
r3.setChecked(false);
}
break;
case R.id.rB2:
if (checked){
r1.setChecked(false);
r3.setChecked(false);
}
break;
case R.id.rB2:
if (checked){
r1.setChecked(false);
r2.setChecked(false);
}
break;
}
I am posting this soulution because I couldn't find the solution to this query on this site(when I was looking for it earlier in the day) and had to figure it out myself. This might be useful for someone else looking for a similar solution.

Problems with Radio Button Group

Am trying to use radio button group widget to select gender in my application. Now here is the thing. The user will select a gender and on clicking the button the user will be guided to the respective activity. I wrote the code . The second problem is that my program does nothing though am launching new activities in the if part. I debugged my program to see if the if condition is satisfied seems to me it does. Here is the xml and the .java file
public class Gender extends Activity{
private RadioGroup radioSexGroup;
private RadioButton radioSexButton;
private Button btnDisplay;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.gender_asking);
addListenerOnButton();
}
public void addListenerOnButton() {
radioSexGroup = (RadioGroup) findViewById(R.id.radioSex);
btnDisplay = (Button) findViewById(R.id.gender_button);
btnDisplay.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
//****************************
int selectedId = radioSexGroup.getCheckedRadioButtonId();
// find the radiobutton by returned id
radioSexButton = (RadioButton) findViewById(selectedId);
if("Iam a Guy!".equals(radioSexButton.getText()))
{
Intent male_activity = new Intent(Gender.this, Meter.class);
startActivity(male_activity);
}
if("Iam a Girl!".equals(radioSexButton.getText()))
{
Intent male_activity = new Intent(Gender.this, For_Girl.class);
startActivity(male_activity);
}
//********************************
}
});
}
}
and the associated xml is:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/hyu_bg"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context=".KissingMeter" >
<TextView
android:id="#+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="34dp"
android:text="Tell Us Your Gender!"
android:textSize="30dp" />
<RadioGroup
android:id="#+id/radioSex"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/gender_button"
android:layout_below="#+id/textView1"
android:layout_marginTop="30dp" >
<RadioButton
android:id="#+id/radioMale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/radioFemale"
android:layout_alignLeft="#+id/radioFemale"
android:layout_marginBottom="34dp"
android:checked="true"
android:text="Iam a Guy!" />
<RadioButton
android:id="#+id/radioFemale"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/gender_button"
android:layout_centerHorizontal="true"
android:layout_marginBottom="44dp"
android:text="Iam a Girl!" />
</RadioGroup>
<Button
android:id="#+id/gender_button"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/radioSex"
android:layout_centerHorizontal="true"
android:layout_marginTop="18dp"
android:text="Lol" />
</RelativeLayout>

First of all, don't rely on the text of a View in this situation. If you decide to change it later then it will create problems. Most likely, you won't change the id of it so just use that. Change it to something like this
btnDisplay.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v)
{
int selectedId = radioSexGroup.getCheckedRadioButtonId(); / get the id
switch (selectedId) // switch on the button selected
{
case R.id.radioMale:
Intent male_activity = new Intent(Gender.this, Meter.class);
startActivity(male_activity);
break;
case R.id.radioFemale:
Intent male_activity = new Intent(Gender.this, For_Girl.class);
startActivity(male_activity);
break;
default:
Toast.makeText(v.getContext(), "No gender selected",
Toast.LENGTH_SHORT).show();
break;
}
//********************************
}
});

RadioButton does not switch from "true" to "false"

I have a problem with my RadioButton which I declerate in my activity_main.xml:
<RadioButton
android:id="#+id/RadioButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/RadioButton00"
android:layout_alignBottom="#+id/RadioButton00"
android:layout_marginLeft="9dp"
android:layout_toRightOf="#+id/RadioButton00" />
<RadioButton
android:id="#+id/RadioButton02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/RadioButton01"
android:layout_alignBottom="#+id/RadioButton01"
android:layout_marginLeft="7dp"
android:layout_toRightOf="#+id/RadioButton01" />
Some of this RadioButtons are set programaticly to "true". But the user should have the right to make it to "false" if he clicks on it. At the moment it doesn't. If I click on it, it just still be true and does not switch to false.
public class MainActivity extends Activity {
private RadioButton RB1, RB2;
int[][] RBTrue = new int[3][16];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
RB1 = (RadioButton) findViewById(R.id.RadioButton00);
RB2 = (RadioButton) findViewById(R.id.RadioButton01);
}
public void setRadioButtons()
{
steine sander = new steine();
sander.setSteine();
RBTrue = sander.getSteine();
if(RBTrue[0][0] == 1)
RB1.setChecked(true);
if(RBTrue[0][1] == 1)
RB2.setChecked(true);
}
So it's pretty easy. I gonna give an array and check it if it's 1 or not. If it is the RadioButton switching to true. But sometimes the user need to switch it back to false. At the moment it's not possible.

Declare the RadioButtons inside a RadioGroup(details here).

<RadioGroup
android:id="#+id/radio_group"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="#+id/RadioButton01"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="...."
android:textSize="15sp" />
<RadioButton
android:id="#+id/RadioButton02"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="....."
android:textSize="15sp" />
</RadioGroup>
then inside activity,,,
RadioGroup rgGroup=(RadioGroup)findViewById(R.id.radio_group);
int selectedId = rgGroup.getCheckedRadioButtonId();
RadioButton rBtn1 =(RadioButton)findViewById(selectedId);
Toast.makeText(MyAndroidAppActivity.this,
rBtn1.getText(), Toast.LENGTH_SHORT).show();

EditText with delete option

Hi please lead me some examples which demonstrate how to create editText with "delete" button , when click on the delete option it will remove the created editText . Thanks in advance ...
code for creating textEdit dynamically..
LinearLayout rAlign = (LinearLayout)findViewById(R.id.lId);
EditText newPass = new EditText(getApplicationContext());
allEds.add(newPass);
newPass.setHint("Name of Label");
newPass.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
newPass.setWidth(318);
newPass.setTextColor(Color.parseColor("#333333"));
newPass.setId(MY_BUTTON);
//newPass.
//newPass.setOnClickListener(this);
rAlign.addView(newPass);
MY_BUTTON ++;
addSpinner(); //Function for adding spinner

The layout could be something like this:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<EditText
android:id="#+id/editText1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_marginTop="50dp"
android:ems="10" >
<requestFocus />
</EditText>
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="#+id/editText1"
android:layout_alignBottom="#+id/editText1"
android:layout_toRightOf="#+id/editText1"
android:text="Button" />
And the Java could be like this:
public class MainActivity extends Activity implements OnClickListener {
TextView tv;
Button btn;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btn = (Button) findViewById(R.id.button1);
tv = (TextView) findViewById(R.id.editText1);
btn.setOnClickListener(this);
}
#Override
public void onClick(View v) {
tv.setVisibility(View.GONE);
}
}

Hide a EditText & make it visible by clicking a menu

I have a layout having the contact deatils of the phone. When i click the option menu i need make an edittext visible in that screen. I have done it. But there is problem facing that the edit text height is occupied in the screen when its made invisible. How can i remove the space occupied by edit text, while its invisible in the screen(layout).. My code is given below
My xml is:
<?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" android:paddingLeft="10dp"
android:paddingRight="10dp">
<ListView android:id="#id/android:list" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:layout_weight="1"
android:drawSelectorOnTop="false">
</ListView>
<TextView android:id="#id/android:empty" android:layout_width="fill_parent"
android:layout_height="fill_parent" android:text="No Entries available">
</TextView>
<TableRow android:id="#+id/TableRow001"
android:layout_width="wrap_content" android:background="#C0C0C0"
android:layout_height="wrap_content">
<EditText android:id="#+id/NumberEditText01"
android:layout_width="wrap_content"
android:paddingLeft="20dip"
android:layout_height="wrap_content">
</EditText>
<Button android:layout_width="wrap_content" android:id="#+id/callNow01"
android:layout_height="wrap_content"
android:text="Call now"
>
</Button>
</TableRow>
</LinearLayout>
and class:
public class ListContacts extends ListActivity {
TableRow tableRow;
EditText phoneNumber;
Button callNow;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Associate the xml with the activity
setContentView(R.layout.activitylist);
tableRow = (TableRow) findViewById(R.id.TableRow001);
tableRow.setVisibility(View.INVISIBLE);
phoneNumber = (EditText) findViewById(R.id.NumberEditText01);
phoneNumber.setVisibility(View.INVISIBLE);
phoneNumber.setKeyListener(DialerKeyListener.getInstance());
callNow = (Button) findViewById(R.id.callNow01);
callNow.setVisibility(View.INVISIBLE);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case FIRST:
tableRow.setVisibility(View.VISIBLE);
phoneNumber.setVisibility(View.VISIBLE);
callNow.setVisibility(View.VISIBLE);
break;
}
}
}

Try phoneNumber.setVisibility(View.GONE);

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.waist2height); {
final EditText edit = (EditText)findViewById(R.id.editText);
final RadioButton rb1 = (RadioButton) findViewById(R.id.radioCM);
final RadioButton rb2 = (RadioButton) findViewById(R.id.radioFT);
if(rb1.isChecked()){
edit.setVisibility(View.VISIBLE);
}
else if(rb2.isChecked()){
edit.setVisibility(View.INVISIBLE);
}
}