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

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1. 364     @Override  
2. 365     public Parcelable onSaveInstanceState() {  
3. 366         // Force our ancestor class to save its state  
4. 367         setFreezesText(true);  
5. 368         Parcelable superState = super.onSaveInstanceState();  
6. 369   
7. 370         SavedState ss = new SavedState(superState);  
8. 371   
9. 372         ss.checked = isChecked();  
10. 373         return ss;  
11. 374     }  
12. 375   
13. 376     @Override  
14. 377     public void onRestoreInstanceState(Parcelable state) {  
15. 378         SavedState ss = (SavedState) state;  
16. 379   
17. 380         super.onRestoreInstanceState(ss.getSuperState());  
18. 381         setChecked(ss.checked);  
19. 382         requestLayout();  
20. 383     }  

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。

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1. public class CheckedTextView2 extends CheckedTextView {  
2.   
3.     public CheckedTextView2(Context context) {  
4.         super(context);  
5.     }  
6.   
7.     public CheckedTextView2(Context context, AttributeSet attrs) {  
8.         super(context, attrs);  
9.     }  
10.   
11.     public CheckedTextView2(Context context, AttributeSet attrs, int defStyle) {  
12.         super(context, attrs, defStyle);  
13.     }  
14.   
15.     static class SavedState extends BaseSavedState {  
16.         boolean checked;  
17.   
18.         /** 
19.          * Constructor called from {@link CompoundButton#onSaveInstanceState()} 
20.          */  
21.         SavedState(Parcelable superState) {  
22.             super(superState);  
23.         }  
24.   
25.         /** 
26.          * Constructor called from {@link #CREATOR} 
27.          */  
28.         private SavedState(Parcel in) {  
29.             super(in);  
30.             checked = (Boolean) in.readValue(null);  
31.         }  
32.   
33.         @Override  
34.         public void writeToParcel(Parcel out, int flags) {  
35.             super.writeToParcel(out, flags);  
36.             out.writeValue(checked);  
37.         }  
38.   
39.         @Override  
40.         public String toString() {  
41.             return "CheckedTextView2.SavedState{"  
42.                     + Integer.toHexString(System.identityHashCode(this))  
43.                     + " checked=" + checked + "}";  
44.         }  
45.   
46.         public static final Parcelable.Creator<SavedState> CREATOR  
47.              = new Parcelable.Creator<SavedState>() {  
48.             public SavedState createFromParcel(Parcel in) {  
49.                 return new SavedState(in);  
50.             }  
51.   
52.             public SavedState[] newArray(int size) {  
53.                 return new SavedState[size];  
54.             }  
55.         };  
56.     }  
57.   
58.     @Override  
59.     public Parcelable onSaveInstanceState() {  
60.         // Force our ancestor class to save its state  
61.         setFreezesText(true);  
62.         Parcelable superState = super.onSaveInstanceState();  
63.   
64.         SavedState ss = new SavedState(superState);  
65.   
66.         ss.checked = isChecked();  
67.         return ss;  
68.     }  
69.   
70.     @Override  
71.     public void onRestoreInstanceState(Parcelable state) {  
72.         SavedState ss = (SavedState) state;  
73.   
74.         super.onRestoreInstanceState(ss.getSuperState());  
75.         setChecked(ss.checked);  
76.         requestLayout();  
77.     }  
78. }  

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(); } }