Android >> 19. AndroidViewModel
16lz
2021-01-23
public class MyViewModel extends AndroidViewModel { private SavedStateHandle handle; /* 获取应用资源，以提供此类访问权限 */ private String key = getApplication().getResources().getString(R.string.Key); private String shp_name = getApplication().getResources().getString(R.string.shp_name); public MyViewModel(@NonNull Application application, SavedStateHandle handle) { super(application); this.handle = handle; if (!handle.contains(key)) { load(); } } private LiveData<Integer> getNumber() { return handle.getLiveData(key); } private void load() { SharedPreferences shp = getApplication().getSharedPreferences(shp_name, Context.MODE_PRIVATE); int x = shp.getInt(key, 0); handle.set(key, x); } void save() { SharedPreferences shp = getApplication().getSharedPreferences(shp_name, Context.MODE_PRIVATE); SharedPreferences.Editor editor = shp.edit(); editor.putInt(key, (getNumber().getValue() == null ? 0 : getNumber().getValue())); editor.apply(); } void add(int x) { handle.set(key, (getNumber().getValue() == null ? 0 : getNumber().getValue()) + x); }}更多相关文章
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