java - 如何使 ImageView 大小为屏幕分辨率的两倍

Question

我试图将 ImageView 的高度和宽度设置为屏幕高度和宽度的两倍，这显然会根据使用的设备而变化。这就是我尝试过的(但 ImageView 只是不可见):

public class MainActivity extends AppCompatActivity {
private ImageView Geoline;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Geoline = findViewById(R.id.Geoline);

//Fetching the Device Resolution
    Display display = getWindowManager().getDefaultDisplay();
    Point size = new Point();
    display.getSize(size);
    int scrWidth = size.x;
    int scrHeight = size.y;

 //Creating variables that are twice the size of screen resolutions
    int scalex = 2 * scrWidth;
    int scaley = 2 * scrHeight;


 //Setting the screen width and height to equal that of variables "scalex" and "scaley"
    Geoline.setScaleX(scalex);
    Geoline.setScaleY(scaley);
}

Answer 1

您尝试在 View 尚未呈现的 onCreate() 中执行此操作，尝试将代码移至 onResume() 或更好地这样做

mBinding.parentView.getViewTreeObserver().addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {

            }
        });

将代码移入其中，它将起作用。