How to group a 3x3 grid of radio buttons?

Question

As the title describes, I'm trying to group up a grid of 3x3 radio buttons into a single radio group. In a previous question asked I learned that for radio buttons to correspond to a single group they had to be the immediate children of the radio group to which they will correspond. I learned this the hard way when I attempted to encapsulate an entire table layout (with the radio buttons in the table rows) in a radio group.

Running into that wall, I tried the following:

<TableLayout android:id="@+id/table_radButtons"          android:layout_width="wrap_content"          android:layout_height="wrap_content"         android:layout_below="@+id/title_radGroup_buffer">          <TableRow>             <RadioGroup android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:orientation="horizontal"                 android:id="@+id/radGroup1">                    <RadioButton android:id="@+id/rad1"                      android:text="Button1"                      android:layout_width="105px"                      android:layout_height="wrap_content"                      android:textSize="13px"></RadioButton>                 <RadioButton android:id="@+id/rad2"                      android:text="Button2"                      android:layout_width="105px"                      android:textSize="13px"                      android:layout_height="wrap_content"></RadioButton>                 <RadioButton android:id="@+id/rad3"                      android:text="Button3"                      android:layout_width="105px"                      android:textSize="13px"                      android:layout_height="wrap_content"></RadioButton>             </RadioGroup>         </TableRow>         <TableRow>             <RadioGroup android:layout_width="fill_parent"                  android:layout_height="wrap_content"                  android:orientation="horizontal"                 android:id="@+id/radGroup1">                   <!-- snippet -->         </TableRow>         <!-- snippet ---> </TableLayout> 

Obviously I didn't learn the first time because I ran into a wall again. I was hoping that the radio buttons in different table rows would notice that they were part of the same radio group (gave each group the same ID) but this didn't work.

Is there any way I can group all of these buttons into a single radio group and still maintain my 3x3 structure (3 rows, 3 radio buttons in each row)?

Answer 1

Actually it's not that hard if you subclass TableLayout like in this example

/**  *   */ package com.codtech.android.view;  import android.content.Context; import android.util.AttributeSet; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.RadioButton; import android.widget.TableLayout; import android.widget.TableRow;  /**  * @author diego  *  */ public class ToggleButtonGroupTableLayout extends TableLayout  implements OnClickListener {      private static final String TAG = "ToggleButtonGroupTableLayout";     private RadioButton activeRadioButton;      /**       * @param context      */     public ToggleButtonGroupTableLayout(Context context) {         super(context);         // TODO Auto-generated constructor stub     }      /**      * @param context      * @param attrs      */     public ToggleButtonGroupTableLayout(Context context, AttributeSet attrs) {         super(context, attrs);         // TODO Auto-generated constructor stub     }      @Override     public void onClick(View v) {         final RadioButton rb = (RadioButton) v;         if ( activeRadioButton != null ) {             activeRadioButton.setChecked(false);         }         rb.setChecked(true);         activeRadioButton = rb;     }      /* (non-Javadoc)      * @see android.widget.TableLayout#addView(android.view.View, int, android.view.ViewGroup.LayoutParams)      */     @Override     public void addView(View child, int index,             android.view.ViewGroup.LayoutParams params) {         super.addView(child, index, params);         setChildrenOnClickListener((TableRow)child);     }       /* (non-Javadoc)      * @see android.widget.TableLayout#addView(android.view.View, android.view.ViewGroup.LayoutParams)      */     @Override     public void addView(View child, android.view.ViewGroup.LayoutParams params) {         super.addView(child, params);         setChildrenOnClickListener((TableRow)child);     }       private void setChildrenOnClickListener(TableRow tr) {         final int c = tr.getChildCount();         for (int i=0; i < c; i++) {             final View v = tr.getChildAt(i);             if ( v instanceof RadioButton ) {                 v.setOnClickListener(this);             }         }     }      public int getCheckedRadioButtonId() {         if ( activeRadioButton != null ) {             return activeRadioButton.getId();         }          return -1;     } } 

and create a layout like this (of course you need to clean it up but you got the idea)

<?xml version="1.0" encoding="utf-8"?> <com.codtech.android.view.ToggleButtonGroupTableLayout     xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="wrap_content" android:layout_height="wrap_content"     android:id="@+id/radGroup1">     <TableRow>             <RadioButton android:id="@+id/rad1" android:text="Button1"                 android:layout_width="105px" android:layout_height="wrap_content"                 android:textSize="13px" />             <RadioButton android:id="@+id/rad2" android:text="Button2"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />             <RadioButton android:id="@+id/rad3" android:text="Button3"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />     </TableRow>     <TableRow>             <RadioButton android:id="@+id/rad1" android:text="Button1"                 android:layout_width="105px" android:layout_height="wrap_content"                 android:textSize="13px" />             <RadioButton android:id="@+id/rad2" android:text="Button2"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />             <RadioButton android:id="@+id/rad3" android:text="Button3"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />     </TableRow>     <TableRow>             <RadioButton android:id="@+id/rad1" android:text="Button1"                 android:layout_width="105px" android:layout_height="wrap_content"                 android:textSize="13px" />             <RadioButton android:id="@+id/rad2" android:text="Button2"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />             <RadioButton android:id="@+id/rad3" android:text="Button3"                 android:layout_width="105px" android:textSize="13px"                 android:layout_height="wrap_content" />     </TableRow> </com.codtech.android.view.ToggleButtonGroupTableLayout> 

Answer 2

After above https://stackoverflow.com/a/2383978/5567009 answer I got another solution for this question, I added some other functionality like, to save the state of the group and also functionality to clear the check functionality like in radio group.

import android.content.Context; import android.os.Parcel; import android.os.Parcelable; import android.support.annotation.IdRes; import android.util.AttributeSet; import android.view.View; import android.widget.RadioButton; import android.widget.TableLayout; import android.widget.TableRow;  public class RadioGridGroup extends TableLayout implements View.OnClickListener {      private static final String TAG = "ToggleButtonGroupTableLayout";     private int checkedButtonID = -1;      /**      * @param context      */     public RadioGridGroup(Context context) {         super(context);         // TODO Auto-generated constructor stub     }      /**      * @param context      * @param attrs      */     public RadioGridGroup(Context context, AttributeSet attrs) {         super(context, attrs);         // TODO Auto-generated constructor stub     }      @Override     public void onClick(View v) {         if (v instanceof RadioButton) {             int id = v.getId();             check(id);         }     }      private void setCheckedStateForView(int viewId, boolean checked) {         View checkedView = findViewById(viewId);         if (checkedView != null && checkedView instanceof RadioButton) {             ((RadioButton) checkedView).setChecked(checked);         }     }      /* (non-Javadoc)      * @see android.widget.TableLayout#addView(android.view.View, int, android.view.ViewGroup.LayoutParams)      */     @Override     public void addView(View child, int index,                         android.view.ViewGroup.LayoutParams params) {         super.addView(child, index, params);         setChildrenOnClickListener((TableRow) child);     }       /* (non-Javadoc)      * @see android.widget.TableLayout#addView(android.view.View, android.view.ViewGroup.LayoutParams)      */     @Override     public void addView(View child, android.view.ViewGroup.LayoutParams params) {         super.addView(child, params);         setChildrenOnClickListener((TableRow) child);     }       private void setChildrenOnClickListener(TableRow tr) {         final int c = tr.getChildCount();         for (int i = 0; i < c; i++) {             final View v = tr.getChildAt(i);             if (v instanceof RadioButton) {                 v.setOnClickListener(this);             }         }     }       /**      * @return the checked button Id      */     public int getCheckedRadioButtonId() {         return checkedButtonID;     }       /**      * Check the id      *      * @param id      */     public void check(@IdRes int id) {         // don't even bother         if (id != -1 && (id == checkedButtonID)) {             return;         }         if (checkedButtonID != -1) {             setCheckedStateForView(checkedButtonID, false);         }         if (id != -1) {             setCheckedStateForView(id, true);         }         setCheckedId(id);     }      /**      * set the checked button Id      *      * @param id      */     private void setCheckedId(int id) {         this.checkedButtonID = id;     }      public void clearCheck() {         check(-1);     }      @Override     protected void onRestoreInstanceState(Parcelable state) {         if (!(state instanceof SavedState)) {             super.onRestoreInstanceState(state);             return;         }          SavedState ss = (SavedState) state;         super.onRestoreInstanceState(ss.getSuperState());          this.checkedButtonID = ss.buttonId;         setCheckedStateForView(checkedButtonID, true);     }      @Override     protected Parcelable onSaveInstanceState() {         Parcelable superState = super.onSaveInstanceState();         SavedState savedState = new SavedState(superState);         savedState.buttonId = checkedButtonID;         return savedState;     }      static class SavedState extends BaseSavedState {         int buttonId;          /**          * Constructor used when reading from a parcel. Reads the state of the superclass.          *          * @param source          */         public SavedState(Parcel source) {             super(source);             buttonId = source.readInt();         }          /**          * Constructor called by derived classes when creating their SavedState objects          *          * @param superState The state of the superclass of this view          */         public SavedState(Parcelable superState) {             super(superState);         }          @Override         public void writeToParcel(Parcel out, int flags) {             super.writeToParcel(out, flags);             out.writeInt(buttonId);         }          public static final Parcelable.Creator<SavedState> CREATOR =                 new Parcelable.Creator<SavedState>() {                     public SavedState createFromParcel(Parcel in) {                         return new SavedState(in);                     }                      public SavedState[] newArray(int size) {                         return new SavedState[size];                     }                 };     } } 

and use this in XML as follows

<com.test.customviews.RadioGridGroup xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="wrap_content"     android:layout_height="wrap_content">      <TableRow android:layout_marginTop="@dimen/preview_five">          <RadioButton             android:id="@+id/rad1"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button1" />          <RadioButton             android:id="@+id/rad2"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button2" />     </TableRow>      <TableRow android:layout_marginTop="@dimen/preview_five">          <RadioButton             android:id="@+id/rad3"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button3" />          <RadioButton             android:id="@+id/rad4"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button4" />     </TableRow>      <TableRow android:layout_marginTop="@dimen/preview_five">          <RadioButton             android:id="@+id/rad5"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button5" />          <RadioButton             android:id="@+id/rad6"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button6" />     </TableRow>      <TableRow android:layout_marginTop="@dimen/preview_five">          <RadioButton             android:id="@+id/rad7"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button7" />          <RadioButton             android:id="@+id/rad8"             android:layout_width="wrap_content"             android:layout_height="wrap_content"             android:text="Button8" />     </TableRow> </com.test.customviews.RadioGridGroup> 

For any other improvements, please comment.