我有一个带有ConstraintLayout的Android Activity。我想以编程方式获得ConstraintLayout的不同视图的高度和宽度,但是我得到0,因为我在onCreate()中执行它,我猜想还没有绘制布局。
我应该在哪里做?
先谢谢!
答案 0 :(得分:1)
int height;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
final View myView = findViewById(R.id.myView);
myView.post(new Runnable(){
@Override
public void run() {
//do the operations related to height here
//this method is asynchronous
height = myView.getHeight();
Log.d(TAG, "Height inside runnable is : "+height); //this will be correct height
}
});
Log.d(TAG, "Height is : "+height); //this will be zero because above method is asynchronous
}
使用post操作可确保在视图创建完成后调用其中的代码。