Android view 数据缓存

Android中经常需要用到view数据的缓存，比如我们希望EditText 在被切到别的界面的时候，输入的数据要仍保持不变。

参考代码：

/*
   缓存textview
 */
public class CPComplexDatePicker extends FrameLayout {

    private Context mContext;
    /**
     * 日期展示
     */
    private TextView mExpireTxt;
    /**
     * 选中的日期
     */
    private String mSelectedDate;
    /**
     * 布局
     */
    private View mContentView;

    public CPComplexDatePicker(Context context) {
        super(context);
        mContext = context;
        init();
    }

    public CPComplexDatePicker(Context context, AttributeSet attrs) {
        super(context, attrs);
        mContext = context;
        init();
    }

    /**
     * 设置日期
     *
     * @param text
     */
    public void setText(String text) {
        if (mExpireTxt != null) {
            mExpireTxt.setText(text);
        }
    }

    @SuppressLint("InflateParams")
    private void init() {
        mContentView = LayoutInflater.from(mContext).inflate(
                R.layout.realname_complex_date_picker,
                (ViewGroup) getRootView());
        mExpireTxt = (TextView) mContentView
                .findViewById(R.id.pid_card_expire_txt);
    }

    /**
     * 保存
     */
    @Override
    public Parcelable onSaveInstanceState() {
        Parcelable parcelable = super.onSaveInstanceState();
        SavedState ss = new SavedState(parcelable);
        ss.mCacheDate = mSelectedDate;
        return ss;
    }

    /**
     * 恢复
     */
    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState ss = (SavedState) state;
        mSelectedDate = ss.mCacheDate;
        // 恢复文本内容
        setText(ss.mCacheDate);
        super.onRestoreInstanceState(ss.getSuperState());
    }

    /**
     * 数据恢复
     *
     * @author wangmingxian
     *
     */
    public static class SavedState extends BaseSavedState {

        /**
         * 缓存日期
         */
        String mCacheDate;
        SavedState(Parcelable superState) {
            super(superState);
        }

        @Override
        public void writeToParcel(Parcel out, int flags) {
            super.writeToParcel(out, flags);
            out.writeString(mCacheDate);
        }

        private SavedState(Parcel in) {
            super(in);
            mCacheDate = in.readString();
        }

        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];
            }
        };
    }
}