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返回零我知道这是一种重复,但其他问题的答案没有帮助我。总是我的ImageView
高度返回零。这里是我的尝试:ImageView高度始终在android
dart.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
int finalHeight = dart.getMeasuredHeight();
int finalWidth = dart.getMeasuredWidth();
Toast.makeText(MainActivity.this," "+finalHeight,Toast.LENGTH_SHORT).show();
return true;
}
});
而且 -
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
height = dart.getHeight();
width = dart.getWidth();
Toast.makeText(MainActivity.this," "+height,Toast.LENGTH_SHORT).show();
}
而且我也试过dart.getHeight()
的onCreate
内,但我的理解是不能工作。我能做什么?
它显示正确的高度,但我想在我的onCreate方法来使用它拨打
dart.getViewTreeObserver().removeOnPreDrawListener(this);
,能不能做到?如果我在onPreDraw()之外使用它,它仍然为零.. – DavidBalas2好吧我在onPreDraw():)中使用它 – DavidBalas2