Android自定义视图保存和恢复状态
我有自定义组件扩展了ImageView。方法onSaveInstanceState和onRestoreInstanceState工作正常,但不幸的是,当我单击查看mIsSelectedState=false时 我怎样才能解决这个问题Android自定义视图保存和恢复状态,android,android-view,android-custom-view,Android,Android View,Android Custom View,我有自定义组件扩展了ImageView。方法onSaveInstanceState和onRestoreInstanceState工作正常,但不幸的是,当我单击查看mIsSelectedState=false时 我怎样才能解决这个问题 public class CustomImageView extends ImageView { private boolean mIsSelectedState; ... public CustomImageView(Context context, Attr
public class CustomImageView extends ImageView {
private boolean mIsSelectedState;
...
public CustomImageView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
init(context, attrs, defStyleAttr);
}
private void init(Context context, AttributeSet attrs, int defStyleAttr) {
setSaveEnabled(true);
TypedArray attributes = context.obtainStyledAttributes(attrs, R.styleable.CustomImageView, defStyleAttr, 0);
...
attributes.recycle();
mPaintImage = new Paint(Paint.ANTI_ALIAS_FLAG);
...
}
@Override
public boolean dispatchTouchEvent(MotionEvent event) {
if (!isClickable()) {
mIsSelectedState = false;
return super.onTouchEvent(event);
}
...
invalidate();
return super.dispatchTouchEvent(event);
}
...
@Override
protected Parcelable onSaveInstanceState() {
Parcelable superState = super.onSaveInstanceState();
SavedState savedState = new SavedState(superState);
savedState.mSelected = mIsSelectedState;
return savedState;
}
@Override
protected void onRestoreInstanceState(Parcelable state) {
if(!(state instanceof SavedState)) {
super.onRestoreInstanceState(state);
return;
}
SavedState savedState = (SavedState)state;
super.onRestoreInstanceState(savedState.getSuperState());
setSelectedState(savedState.mSelected);
setBorderColor(mBorderSelectedColor);
}
private void setSelectedState(boolean isSelected) {
mIsSelectedState = isSelected;
}
...
private static class SavedState extends BaseSavedState {
boolean mSelected;
SavedState(Parcelable superState) {
super(superState);
}
private SavedState(Parcel in) {
super(in);
mSelected = in.readByte() != 0;
}
@Override
public void writeToParcel(Parcel out, int flags) {
super.writeToParcel(out, flags);
out.writeByte((byte) (mSelected ? 1 : 0));
}
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];
}
};
}
公共类CustomImageView扩展了ImageView{
私有布尔未选状态;
...
公共CustomImageView(上下文上下文、属性集属性、int defStyleAttr){
super(上下文、attrs、defStyleAttr);
init(上下文、attrs、defStyleAttr);
}
私有void init(上下文上下文、属性集attrs、int defStyleAttr){
setSaveEnabled(真);
TypedArray attributes=context.ActainStyledAttributes(attrs,R.styleable.CustomImageView,defStyleAttr,0);
...
attributes.recycle();
mpaimpigage=新油漆(油漆.防油漆别名\u标志);
...
}
@凌驾
公共布尔dispatchTouchEvent(MotionEvent){
如果(!isClickable()){
mIsSelectedState=false;
返回super.onTouchEvent(事件);
}
...
使无效();
返回super.dispatchTouchEvent(事件);
}
...
@凌驾
受保护的地块onSaveInstanceState(){
可包裹的超级状态=super.onSaveInstanceState();
SavedState SavedState=新的SavedState(超级状态);
savedState.mSelected=mIsSelectedState;
返回savedState;
}
@凌驾
RestoreInstanceState上的受保护无效(可包裹状态){
如果(!(保存状态的状态实例)){
super.onRestoreInstanceState(状态);
返回;
}
SavedState SavedState=(SavedState)状态;
super.onRestoreInstanceState(savedState.getSuperState());
setSelectedState(savedState.mSelected);
setOrderColor(mBorderSelectedColor);
}
私有void setSelectedState(布尔值isSelected){
MissectedState=isSelected;
}
...
私有静态类SavedState扩展了BaseSavedState{
选择布尔值;
保存状态(可包裹的超级状态){
超级(超级国家);
}
私有存储状态(包裹在中){
超级(in),;
mSelected=in.readByte()!=0;
}
@凌驾
公共无效写入包(包出,内部标志){
super.writeToParcel(输出,标志);
out.writeByte((字节)(mSelected?1:0));
}
公共静态最终包裹。创建者=
新建Parcelable.Creator(){
public SavedState createFromParcel(中的地块){
返回新的SavedState(in);
}
public SavedState[]新数组(整数大小){
返回新的SavedState[大小];
}
};
}
保存状态的正确方法如下所示:
第一个覆盖onSaveInstanceState()
然后,无论何时恢复,都应覆盖:
@Override
public void onRestoreInstanceState(Bundle savedInstanceState) {
// Always call the superclass so it can restore the view hierarchy
super.onRestoreInstanceState(savedInstanceState);
// Restore state members from saved instance
mIsSelectedState = savedInstanceState.getInt("myconstantKey");
}
如果要在活动之间切换,也可以在onCreate
上执行此操作
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
mIsSelectedState = savedInstanceState.getBoolean("myconstantKey");
}
...
}
请记住,Android活动生命周期很棘手,但一旦掌握了窍门,一切都会变得更好:)
希望能有帮助。如果(!isClickable())可能会进入内部{mIsSelectedState=false;这就是为什么您得到的结果是false。您调试过吗?仅供参考:在我看来,没有必要创建您自己的包裹。在大多数情况下,它会给您的代码添加大量的垃圾。只需使用内置的Bundle类,并在其上设置属性。@ShadabAnsari是的,我检查了它。我还对其进行了更详细的借记。在nDraw()调用了onRestoreInstantState并将mIsSelectedState设置为正确的值,但不幸的是,在onDraw()期间,我遇到了不正确的错误data@Matt为什么您认为这个捆绑包更好?例如在View super.onSaveInstanceState()中返回Parcelable对象。当我们谈论示例活动时,我同意你的看法。主要是因为你不能搞乱包裹上的包裹。自定义包裹总是有可能编码错误。这是活动的正确方式,但我认为他希望在视图级别处理它。是的,我希望保存和恢复da视像层的电讯局长
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState != null) {
mIsSelectedState = savedInstanceState.getBoolean("myconstantKey");
}
...
}