方向改变时手势会清除

发布于 2024-11-02 00:33:18 字数 919 浏览 0 评论 0原文

我的布局中有一个gestureOverlayView，用于绘制数字签名。当我以某个方向（例如横向）绘制然后更改方向时，问题就出现了——overlayView 就被清除了。我尝试过包括 onConfigurationChanged(); 但没有效果。我还尝试使用 onSaveInstance 和 onRestoreInstance 进行以下操作，但它没有给我解决方案：

@Override
protected void onSaveInstanceState(Bundle outState) {
    Gesture gesture = overlay.getGesture();
    outState.putParcelable("gesture", (Parcelable) gesture);
    super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    Gesture gesture = (Gesture) savedInstanceState.getParcelable("gesture");
    overlay.setGesture(gesture);
    mDoneButton.setEnabled(true);
    super.onRestoreInstanceState(savedInstanceState);
}

我也尝试过包括：

  android:configChanges="fontScale|uiMode|screenLayout|navigation|touchscreen|mcc|mnc|orientation|keyboardHidden|keyboard">

但即使这样也没有用。

有人有解决这个问题的办法吗？

原文

I have a gestureOverlayView in my layout which I am using for drawing digital Signature. The problem arises when I draw in a certain orientation (say landscape) and then change the orientation - the overlayView just clears. I have tried including onConfigurationChanged();but no effect. I have also attempted the following with onSaveInstance and onRestoreInstance, but it gives me no solution:

@Override
protected void onSaveInstanceState(Bundle outState) {
    Gesture gesture = overlay.getGesture();
    outState.putParcelable("gesture", (Parcelable) gesture);
    super.onSaveInstanceState(outState);
}

@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
    Gesture gesture = (Gesture) savedInstanceState.getParcelable("gesture");
    overlay.setGesture(gesture);
    mDoneButton.setEnabled(true);
    super.onRestoreInstanceState(savedInstanceState);
}

I have also tried including:

  android:configChanges="fontScale|uiMode|screenLayout|navigation|touchscreen|mcc|mnc|orientation|keyboardHidden|keyboard">

But even this is of no use.

Does anyone have a solution for this problem?

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就像说晚安 2024-11-09 00:33:18

我在我的应用程序中尝试了您的代码并遇到了同样的问题。 getGesture() 的结果在 onSaveInstanceState、onStop 和 onPause 中为 null，因此我猜测 GestureOverlayView 在屏幕旋转和调用这些方法之间的某个位置无效。

解决方法是重写 onGesturePerformed，假设您的 Activity 实现 OnGesturePerformedListener 并且您在叠加层上调用 addOnGesturePerformedListener(this)，并保存最近手势的成员实例。类似于：

    @Override
public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    mCurrentGesture = gesture;
    }

然后在 onSaveInstanceState 中，只需获取并打包成员实例，而不是调用 getGesture()。现在，当 Activity 重新创建自身时，setGesture() 应该按预期工作。

I tried your code in my application and had the same issue. The result of getGesture() is null within onSaveInstanceState, onStop, and onPause, so I'm guessing that the GestureOverlayView is invalidated somewhere between the screen rotation and the calling of those methods.

A workaround is to override onGesturePerformed, assuming your Activity implements OnGesturePerformedListener and you call addOnGesturePerformedListener(this) on your overlay, and save a member instance of the most recent Gesture. Something like:

    @Override
public void onGesturePerformed(GestureOverlayView overlay, Gesture gesture) {
    mCurrentGesture = gesture;
    }

Then in your onSaveInstanceState, simply get and package the member instance instead of calling getGesture(). Now setGesture() should work as expected when the Activity recreates itself.

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