TextView中onSaveInstanceState()方法

@Override
public Parcelable onSaveInstanceState() {
    Parcelable superState = super.onSaveInstanceState();

    // Save state if we are forced to
    final boolean freezesText = getFreezesText();
    boolean hasSelection = false;
    int start = -1;
    int end = -1;

    if (mText != null) {
        start = getSelectionStart();
        end = getSelectionEnd();
        if (start >= 0 || end >= 0) {
            // Or save state if there is a selection
            hasSelection = true;
        }
    }

    if (freezesText || hasSelection) {
        SavedState ss = new SavedState(superState);

        if (freezesText) {
            if (mText instanceof Spanned) {
                final Spannable sp = new SpannableStringBuilder(mText);

                if (mEditor != null) {
                    removeMisspelledSpans(sp);
                    sp.removeSpan(mEditor.mSuggestionRangeSpan);
                }

                ss.text = sp;
            } else {
                ss.text = mText.toString();
            }
        }

        if (hasSelection) {
            // XXX Should also save the current scroll position!
            ss.selStart = start;
            ss.selEnd = end;
        }

        if (isFocused() && start >= 0 && end >= 0) {
            ss.frozenWithFocus = true;
        }

        ss.error = getError();

        if (mEditor != null) {
            ss.editorState = mEditor.saveInstanceState();
        }
        return ss;
    }

    return superState;
}

從上述源碼可以看出适篙，TextView保存了自己的文本選中狀態(tài)和文本內(nèi)容碳抄，并且通過(guò)查看器onRestoreInstanceState方法源碼,可以發(fā)現(xiàn)它的確恢復(fù)了這些數(shù)據(jù)。

TextView中onRestoreInstanceState源碼

 @Override
public void onRestoreInstanceState(Parcelable state) {
    if (!(state instanceof SavedState)) {
        super.onRestoreInstanceState(state);
        return;
    }

    SavedState ss = (SavedState)state;
    super.onRestoreInstanceState(ss.getSuperState());

    // XXX restore buffer type too, as well as lots of other stuff
    if (ss.text != null) {
        setText(ss.text);
    }

    if (ss.selStart >= 0 && ss.selEnd >= 0) {
        if (mText instanceof Spannable) {
            int len = mText.length();

            if (ss.selStart > len || ss.selEnd > len) {
                String restored = "";

                if (ss.text != null) {
                    restored = "(restored) ";
                }

                Log.e(LOG_TAG, "Saved cursor position " + ss.selStart +
                      "/" + ss.selEnd + " out of range for " + restored +
                      "text " + mText);
            } else {
                Selection.setSelection((Spannable) mText, ss.selStart, ss.selEnd);

                if (ss.frozenWithFocus) {
                    createEditorIfNeeded();
                    mEditor.mFrozenWithFocus = true;
                }
            }
        }
    }

    if (ss.error != null) {
        final CharSequence error = ss.error;
        // Display the error later, after the first layout pass
        post(new Runnable() {
            public void run() {
                if (mEditor == null || !mEditor.mErrorWasChanged) {
                    setError(error);
                }
            }
        });
    }

    if (ss.editorState != null) {
        createEditorIfNeeded();
        mEditor.restoreInstanceState(ss.editorState);
    }
}