Android(安卓)>> 19. AndroidViewModel

> 19. AndroidViewModel_第1张图片" width="650" height="629" style="border:1px solid black;">

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);    }}

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