[英]savedInstanceState is not null but has no data
我有一个片段活动,在该活动中,我导航到搜索页面,然后返回结果列表。 有时需要重新创建活动,因此我像这样保存实例数据:
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
System.out.println("Saving instance state!");
// Save the instance data
// Filter data
Intent mIntent = new Intent(this, BasicMapDemoActivity.class);
filter.addFilterToIntent(mIntent);
outState = mIntent.getExtras();
// Save date data
int year = currentDate.getYear();
int month = currentDate.getMonth();
int day = currentDate.getDay();
outState.putInt("YEAR",year);
outState.putInt("MONTH",month);
outState.putInt("DAY",day);
// Location data
double latitude = mapLocation.latitude;
double longitude = mapLocation.longitude;
outState.putDouble("LATITUDE",latitude);
outState.putDouble("LONGITUDE",longitude);
// Other
outState.putString("VIEW_MODE",viewMode.toString());
outState.putString("SORT_TYPE",sortType);
outState.putInt("ZOOM", mapZoom);
}
然后,我尝试还原onCreate中的数据,但是当我到达那里时,捆绑包不为null,但是它不包含我保存到其中的任何数据。 以下所有get函数均返回零(在上述代码块的末尾,我确认数据为非零):
Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// If we are 're-creating', then get the old instance data, otherwise set defaults
if(savedInstanceState == null)
{
// Set up default instance data
currentDate = new Date(115,4,1);
filter = new ObajoFilter();
filter.start = currentDate;
filter.end = new Date(115,4,1,23,59,0);
viewMode = ViewMode.MAP;
sortType = "Distance";
mapLocation = userLocation;
mapZoom = 16;
} else {
// Get date data
int year = savedInstanceState.getInt("YEAR");
int month = savedInstanceState.getInt("MONTH");
int day = savedInstanceState.getInt("DAY");
currentDate = new Date(year,month,day);
关于什么可以清空捆绑包的任何想法? 据我了解,仅当应用程序完全销毁后,savevedInstanceData才为空。
由于这一行, 所以outState = mIntent.getExtras();
您的outState指向不同的地址mIntent.getExtras() ,因此为空
您应该直接使用outState.putXX而不创建新对象。
您是否要在onSaveInstanceState
存储要保留的信息,如下所示
@Override
public void onSaveInstanceState(Bundle outState) {
outState.putParcelable("someobject", someobject);
outState.putBoolean("someboolean", someBoolean);
outState.putInt("someint", someInt);
super.onSaveInstanceState(outState);
}
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