Sets the selection to the radio button whose identifier is passed in 122 | * parameter. Using -1 as the selection identifier clears the selection; 123 | * such an operation is equivalent to invoking {@link #clearCheck()}.
124 | * 125 | * @param id the unique id of the radio button to select in this group 126 | * 127 | * @see #getCheckedRadioButtonId() 128 | * @see #clearCheck() 129 | */ 130 | public void check(@IdRes int id) { 131 | // don't even bother 132 | if (id != -1 && (id == mCheckedId)) { 133 | return; 134 | } 135 | 136 | if (mCheckedId != -1) { 137 | setCheckedStateForView(mCheckedId, false); 138 | } 139 | 140 | if (id != -1) { 141 | setCheckedStateForView(id, true); 142 | } 143 | 144 | setCheckedId(id); 145 | } 146 | 147 | private void setCheckedId(@IdRes int id) { 148 | mCheckedId = id; 149 | if (mOnCheckedChangeListener != null) { 150 | mOnCheckedChangeListener.onCheckedChanged(this, mCheckedId); 151 | } 152 | } 153 | 154 | private void setCheckedStateForView(int viewId, boolean checked) { 155 | View checkedView = findViewById(viewId); 156 | if (checkedView != null && checkedView instanceof CompoundViewGroup) { 157 | ((CompoundViewGroup) checkedView).setChecked(checked); 158 | } 159 | } 160 | 161 | /** 162 | *Returns the identifier of the selected radio button in this group. 163 | * Upon empty selection, the returned value is -1.
164 | * 165 | * @return the unique id of the selected radio button in this group 166 | * 167 | * @see #check(int) 168 | * @see #clearCheck() 169 | * 170 | */ 171 | @IdRes 172 | public int getCheckedRadioButtonId() { 173 | return mCheckedId; 174 | } 175 | 176 | /** 177 | *Clears the selection. When the selection is cleared, no radio button 178 | * in this group is selected and {@link #getCheckedRadioButtonId()} returns 179 | * null.
180 | * 181 | * @see #check(int) 182 | * @see #getCheckedRadioButtonId() 183 | */ 184 | public void clearCheck() { 185 | check(-1); 186 | } 187 | 188 | /** 189 | *Register a callback to be invoked when the checked radio button 190 | * changes in this group.
191 | * 192 | * @param listener the callback to call on checked state change 193 | */ 194 | public void setOnCheckedChangeListener(OnGroupCheckedChangeListener listener) { 195 | mOnCheckedChangeListener = listener; 196 | } 197 | 198 | /** 199 | * {@inheritDoc} 200 | */ 201 | @Override 202 | public LayoutParams generateLayoutParams(AttributeSet attrs) { 203 | return new RadioGroup2.LayoutParams(getContext(), attrs); 204 | } 205 | 206 | /** 207 | * {@inheritDoc} 208 | */ 209 | @Override 210 | protected boolean checkLayoutParams(ViewGroup.LayoutParams p) { 211 | return p instanceof RadioGroup2.LayoutParams; 212 | } 213 | 214 | @Override 215 | protected LinearLayout.LayoutParams generateDefaultLayoutParams() { 216 | return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 217 | } 218 | 219 | @Override 220 | public CharSequence getAccessibilityClassName() { 221 | return RadioGroup2.class.getName(); 222 | } 223 | 224 | /** 225 | *This set of layout parameters defaults the width and the height of 226 | * the children to {@link #WRAP_CONTENT} when they are not specified in the 227 | * XML file. Otherwise, this class ussed the value read from the XML file.
228 | * 229 | */ 230 | public static class LayoutParams extends LinearLayout.LayoutParams { 231 | /** 232 | * {@inheritDoc} 233 | */ 234 | public LayoutParams(Context c, AttributeSet attrs) { 235 | super(c, attrs); 236 | } 237 | 238 | /** 239 | * {@inheritDoc} 240 | */ 241 | public LayoutParams(int w, int h) { 242 | super(w, h); 243 | } 244 | 245 | /** 246 | * {@inheritDoc} 247 | */ 248 | public LayoutParams(int w, int h, float initWeight) { 249 | super(w, h, initWeight); 250 | } 251 | 252 | /** 253 | * {@inheritDoc} 254 | */ 255 | public LayoutParams(ViewGroup.LayoutParams p) { 256 | super(p); 257 | } 258 | 259 | /** 260 | * {@inheritDoc} 261 | */ 262 | public LayoutParams(MarginLayoutParams source) { 263 | super(source); 264 | } 265 | 266 | /** 267 | *Fixes the child's width to 268 | * {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} and the child's 269 | * height to {@link android.view.ViewGroup.LayoutParams#WRAP_CONTENT} 270 | * when not specified in the XML file.
271 | * 272 | * @param a the styled attributes set 273 | * @param widthAttr the width attribute to fetch 274 | * @param heightAttr the height attribute to fetch 275 | */ 276 | @Override 277 | protected void setBaseAttributes(TypedArray a, 278 | int widthAttr, int heightAttr) { 279 | 280 | if (a.hasValue(widthAttr)) { 281 | width = a.getLayoutDimension(widthAttr, "layout_width"); 282 | } else { 283 | width = WRAP_CONTENT; 284 | } 285 | 286 | if (a.hasValue(heightAttr)) { 287 | height = a.getLayoutDimension(heightAttr, "layout_height"); 288 | } else { 289 | height = WRAP_CONTENT; 290 | } 291 | } 292 | } 293 | 294 | /** 295 | *Interface definition for a callback to be invoked when the checked 296 | * radio button changed in this group.
297 | */ 298 | public interface OnGroupCheckedChangeListener { 299 | /** 300 | *Called when the checked radio button has changed. When the 301 | * selection is cleared, checkedId is -1.
302 | * 303 | * @param group the group in which the checked radio button has changed 304 | * @param checkedId the unique identifier of the newly checked radio button 305 | */ 306 | void onCheckedChanged(RadioGroup2 group, @IdRes int checkedId); 307 | } 308 | 309 | private class CheckedStateTracker implements OnCheckedChangeListener { 310 | @Override 311 | public void onCheckedChanged(CompoundViewGroup compoundView, boolean isChecked) { 312 | // prevents from infinite recursion 313 | if (mProtectFromCheckedChange) { 314 | return; 315 | } 316 | 317 | mProtectFromCheckedChange = true; 318 | if (mCheckedId != -1) { 319 | setCheckedStateForView(mCheckedId, false); 320 | } 321 | mProtectFromCheckedChange = false; 322 | 323 | int id = compoundView.getId(); 324 | setCheckedId(id); 325 | } 326 | } 327 | 328 | /** 329 | *A pass-through listener acts upon the events and dispatches them 330 | * to another listener. This allows the table layout to set its own internal 331 | * hierarchy change listener without preventing the user to setup his.
332 | */ 333 | private class PassThroughHierarchyChangeListener implements 334 | ViewGroup.OnHierarchyChangeListener { 335 | private ViewGroup.OnHierarchyChangeListener mOnHierarchyChangeListener; 336 | 337 | /** 338 | * {@inheritDoc} 339 | */ 340 | public void onChildViewAdded(View parent, View child) { 341 | if (parent == RadioGroup2.this && child instanceof CompoundViewGroup) { 342 | int id = child.getId(); 343 | // generates an id if it's missing 344 | if (id == View.NO_ID) { 345 | id = child.hashCode(); 346 | child.setId(id); 347 | } 348 | ((CompoundViewGroup) child).setOnCheckedChangeWidgetListener( 349 | mChildOnCheckedChangeListener); 350 | } 351 | 352 | if (mOnHierarchyChangeListener != null) { 353 | mOnHierarchyChangeListener.onChildViewAdded(parent, child); 354 | } 355 | } 356 | 357 | /** 358 | * {@inheritDoc} 359 | */ 360 | public void onChildViewRemoved(View parent, View child) { 361 | if (parent == RadioGroup2.this && child instanceof CompoundViewGroup) { 362 | ((CompoundViewGroup) child).setOnCheckedChangeWidgetListener(null); 363 | } 364 | 365 | if (mOnHierarchyChangeListener != null) { 366 | mOnHierarchyChangeListener.onChildViewRemoved(parent, child); 367 | } 368 | } 369 | } 370 | } 371 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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