我已经成功地实现了onRetainNonConfigurationInstance()为我的主活动保存和恢复某些关键组件跨屏幕方向的变化。

但看起来,当方向改变时,我的自定义视图正在从头重新创建。这是有意义的,尽管在我的例子中不方便,因为所讨论的自定义视图是一个X/Y图形,并且绘制的点存储在自定义视图中。

是否有一种巧妙的方法来实现类似于onRetainNonConfigurationInstance()的自定义视图,或者我只需要在自定义视图中实现方法,允许我获得和设置其“状态”?


当前回答

用kotlin很容易

@Parcelize
class MyState(val superSavedState: Parcelable?, val loading: Boolean) : View.BaseSavedState(superSavedState), Parcelable


class MyView : View {

    var loading: Boolean = false

    override fun onSaveInstanceState(): Parcelable? {
        val superState = super.onSaveInstanceState()
        return MyState(superState, loading)
    }

    override fun onRestoreInstanceState(state: Parcelable?) {
        val myState = state as? MyState
        super.onRestoreInstanceState(myState?.superSaveState ?: state)

        loading = myState?.loading ?: false
        //redraw
    }
}

其他回答

我发现这个答案在Android版本9和10上导致了一些崩溃。我认为这是一个很好的方法,但当我在看一些Android代码时,我发现它缺少一个构造函数。答案是相当古老的,所以在当时可能没有必要。当我添加了缺失的构造函数并从创建者调用它时,崩溃就修复了。

下面是编辑后的代码:

public class CustomView extends LinearLayout {

    private int stateToSave;

    ...

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

        // your custom state
        ss.stateToSave = this.stateToSave;

        return ss;
    }

    @Override
    protected void dispatchSaveInstanceState(SparseArray<Parcelable> container)
    {
        dispatchFreezeSelfOnly(container);
    }

    @Override
    public void onRestoreInstanceState(Parcelable state) {
        SavedState ss = (SavedState) state;
        super.onRestoreInstanceState(ss.getSuperState());

        // your custom state
        this.stateToSave = ss.stateToSave;
    }

    @Override
    protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container)
    {
        dispatchThawSelfOnly(container);
    }

    static class SavedState extends BaseSavedState {
        int stateToSave;

        SavedState(Parcelable superState) {
            super(superState);
        }

        private SavedState(Parcel in) {
            super(in);
            this.stateToSave = in.readInt();
        }

        // This was the missing constructor
        @RequiresApi(Build.VERSION_CODES.N)
        SavedState(Parcel in, ClassLoader loader)
        {
            super(in, loader);
            this.stateToSave = in.readInt();
        }

        @Override
        public void writeToParcel(Parcel out, int flags) {
            super.writeToParcel(out, flags);
            out.writeInt(this.stateToSave);
        }    
        
        public static final Creator<SavedState> CREATOR =
            new ClassLoaderCreator<SavedState>() {
          
            // This was also missing
            @Override
            public SavedState createFromParcel(Parcel in, ClassLoader loader)
            {
                return Build.VERSION.SDK_INT >= Build.VERSION_CODES.N ? new SavedState(in, loader) : new SavedState(in);
            }

            @Override
            public SavedState createFromParcel(Parcel in) {
                return new SavedState(in, null);
            }

            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };
    }
}

我有一个问题,onRestoreInstanceState恢复了我所有的自定义视图与最后一个视图的状态。我通过向我的自定义视图添加这两个方法来解决这个问题:

@Override
protected void dispatchSaveInstanceState(SparseArray<Parcelable> container) {
    dispatchFreezeSelfOnly(container);
}

@Override
protected void dispatchRestoreInstanceState(SparseArray<Parcelable> container) {
    dispatchThawSelfOnly(container);
}

你可以通过实现view# onSaveInstanceState和view# onRestoreInstanceState并扩展视图来实现这一点。BaseSavedState类。

public class CustomView extends View {

  private int stateToSave;

  ...

  @Override
  public Parcelable onSaveInstanceState() {
    //begin boilerplate code that allows parent classes to save state
    Parcelable superState = super.onSaveInstanceState();

    SavedState ss = new SavedState(superState);
    //end

    ss.stateToSave = this.stateToSave;

    return ss;
  }

  @Override
  public void onRestoreInstanceState(Parcelable state) {
    //begin boilerplate code so parent classes can restore state
    if(!(state instanceof SavedState)) {
      super.onRestoreInstanceState(state);
      return;
    }

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

    this.stateToSave = ss.stateToSave;
  }

  static class SavedState extends BaseSavedState {
    int stateToSave;

    SavedState(Parcelable superState) {
      super(superState);
    }

    private SavedState(Parcel in) {
      super(in);
      this.stateToSave = in.readInt();
    }

    @Override
    public void writeToParcel(Parcel out, int flags) {
      super.writeToParcel(out, flags);
      out.writeInt(this.stateToSave);
    }

    //required field that makes Parcelables from a Parcel
    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];
          }
    };
  }
}

该工作在视图和视图的SavedState类之间进行分割。您应该在SavedState类中完成对Parcel进行读写的所有工作。然后,您的View类可以执行提取状态成员的工作,并执行将类恢复到有效状态所需的工作。

注意:如果View#getId返回值>= 0,则View#onSavedInstanceState和View#onRestoreInstanceState将自动为您调用。当您在xml中给它一个id或手动调用setId时,就会发生这种情况。否则,您必须调用view# onSaveInstanceState并将Parcelable返回到您在活动#onSaveInstanceState中获得的包中以保存状态,随后读取它并将其传递给活动#onRestoreInstanceState中的view# onRestoreInstanceState。

另一个简单的例子是CompoundButton

我认为这是一个更简单的版本。Bundle是实现Parcelable的内置类型

public class CustomView extends View
{
  private int stuff; // stuff

  @Override
  public Parcelable onSaveInstanceState()
  {
    Bundle bundle = new Bundle();
    bundle.putParcelable("superState", super.onSaveInstanceState());
    bundle.putInt("stuff", this.stuff); // ... save stuff 
    return bundle;
  }

  @Override
  public void onRestoreInstanceState(Parcelable state)
  {
    if (state instanceof Bundle) // implicit null check
    {
      Bundle bundle = (Bundle) state;
      this.stuff = bundle.getInt("stuff"); // ... load stuff
      state = bundle.getParcelable("superState");
    }
    super.onRestoreInstanceState(state);
  }
}

除了使用onSaveInstanceState和onRestoreInstanceState,你还可以使用ViewModel。让你的数据模型扩展ViewModel,然后你可以在每次Activity被重新创建时使用ViewModelProviders来获得你的模型的相同实例:

class MyData extends ViewModel {
    // have all your properties with getters and setters here
}

public class MyActivity extends FragmentActivity {
    @Override
    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // the first time, ViewModelProvider will create a new MyData
        // object. When the Activity is recreated (e.g. because the screen
        // is rotated), ViewModelProvider will give you the initial MyData
        // object back, without creating a new one, so all your property
        // values are retained from the previous view.
        myData = ViewModelProviders.of(this).get(MyData.class);

        ...
    }
}

要使用ViewModelProviders,在app/build.gradle中添加以下依赖项:

implementation "android.arch.lifecycle:extensions:1.1.1"
implementation "android.arch.lifecycle:viewmodel:1.1.1"

注意你的MyActivity扩展了FragmentActivity而不仅仅是扩展了Activity。

你可以在这里阅读更多关于ViewModels的信息:

Android开发者指南,处理配置更改 Android开发者指南,保存UI状态,使用ViewModel处理配置更改 教程视图模型:一个简单的例子