android - 将 ImageView 平移到左上角

Question

我在寻找从 RelativeLayout 中心转换 ImageView 的解决方案时遇到问题，其方式是 ImageView 的左上角保持在布局的左上角。大多数选项都以 ImageView 的中心作为引用进行翻译，并且/或者在所有屏幕尺寸上都无法正常工作。

这是迄今为止最好的选择，除了 ImageView 的中心位于布局的左上角 (0,0) 之外:

TranslateAnimation anim = new TranslateAnimation(
    TranslateAnimation.RELATIVE_TO_PARENT,0.0f,
    TranslateAnimation.RELATIVE_TO_PARENT,-0.5f,
    TranslateAnimation.RELATIVE_TO_PARENT,0.0f,
    TranslateAnimation.RELATIVE_TO_PARENT,-0.5f
);
anim.setFillAfter(true);
anim.setDuration(1000);

image.startAnimation(anim);

Answer 1

您可以尝试使用 TranslateAnimation.ABSOLUTE。有了它，您可以更精确地计算增量值。

RelativeLayout relativeLayout = (RelativeLayout) findViewById(<R.id of your relative layout id>);
ImageView imageView = (ImageView) findViewById(<R.id of your image view id>);

int deltaX = (relativeLayout.getWidth() / 2) - (imageView.getWidth() / 2);
int deltaY = (relativeLayout.getHeight() / 2) - (imageView.getHeight() / 2);

TranslateAnimation anim = new TranslateAnimation(
    TranslateAnimation.ABSOLUTE, 0.0f, 
    TranslateAnimation.ABSOLUTE, -deltaX,
    TranslateAnimation.ABSOLUTE, 0.0f,
    TranslateAnimation.ABSOLUTE, -deltaY
);
anim.setFillAfter(true);
anim.setDuration(1000);

image.startAnimation(anim);