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"Non-static method cannot be referenced from a static context" error（4个答案）
3小时前关门了。
我正在尝试创建一个类，它获取我的虚拟Android屏幕的尺寸，然后在终端中打印宽度和高度。
ScreenDimensions.java:

class ScreenDimensions {

    Context context;
    WindowManager windowManager = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    WindowMetrics metrics = windowManager.getMaximumWindowMetrics();
    Rect bounds = metrics.getBounds();
    private int dWidth = bounds.width();
    private int dHeight = bounds.height();

    public void showDisplayDimensions() {
            Log.i("DISPLAY HEIGHT", String.valueOf(dWidth));
            Log.i("DISPLAY WIDTH", String.valueOf(dHeight));
        }

}

MainActivity.java:

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.activity_main);

        ScreenDimensions.showDisplayDimensions();

        setContentView(new Menu(this));

    }
}

它说非静态方法（showDisplayDimensions）不能从静态上下文引用，但我不明白为什么我的MainActivity类被认为是静态的。