Android CheckedTextViewでチェック状態を保持させる

CheckBoxやRadioButtonはチェック状態を保持するけどCheckedTextViewはしてくれません。

CheckBoxやRadioButtonはCompoundButtonを継承しているのですが、このコードを見ると以下のようにonSaveInstanceState()とonRestoreInstanceState()できちんと処理されています。

http://tools.oesf.biz/android-4.4.2_r1.0/xref/frameworks/base/core/java/android/widget/CompoundButton.java#364 364 @Override 365 public Parcelable onSaveInstanceState() { 366 // Force our ancestor class to save its state 367 setFreezesText(true); 368 Parcelable superState = super.onSaveInstanceState(); 369 370 SavedState ss = new SavedState(superState); 371 372 ss.checked = isChecked(); 373 return ss; 374 } 375 376 @Override 377 public void onRestoreInstanceState(Parcelable state) { 378 SavedState ss = (SavedState) state; 379 380 super.onRestoreInstanceState(ss.getSuperState()); 381 setChecked(ss.checked); 382 requestLayout(); 383 } 一方、CheckedTextViewではそのような処理は見あたりません。
http://tools.oesf.biz/android-4.4.2_r1.0/xref/frameworks/base/core/java/android/widget/CheckedTextView.java

なのでCheckedTextViewを継承して上記の処理を移植すれば、チェック状態を保持してくれるようになります。 public class CheckedTextView2 extends CheckedTextView { public CheckedTextView2(Context context) { super(context); } public CheckedTextView2(Context context, AttributeSet attrs) { super(context, attrs); } public CheckedTextView2(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); } static class SavedState extends BaseSavedState { boolean checked; /** * Constructor called from {@link CompoundButton#onSaveInstanceState()} */ SavedState(Parcelable superState) { super(superState); } /** * Constructor called from {@link #CREATOR} */ private SavedState(Parcel in) { super(in); checked = (Boolean) in.readValue(null); } @Override public void writeToParcel(Parcel out, int flags) { super.writeToParcel(out, flags); out.writeValue(checked); } @Override public String toString() { return "CheckedTextView2.SavedState{" + Integer.toHexString(System.identityHashCode(this)) + " checked=" + checked + "}"; } 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]; } }; } @Override public Parcelable onSaveInstanceState() { // Force our ancestor class to save its state setFreezesText(true); Parcelable superState = super.onSaveInstanceState(); SavedState ss = new SavedState(superState); ss.checked = isChecked(); return ss; } @Override public void onRestoreInstanceState(Parcelable state) { SavedState ss = (SavedState) state; super.onRestoreInstanceState(ss.getSuperState()); setChecked(ss.checked); requestLayout(); } }