按钮幻灯片取决于分辨率

Question

我的目标是点击每颗星时出现一个红色圆圈。一切都以完全分辨率运行。问题在于，当以其他分辨率运行应用程序时，按钮以较小的分辨率向下滑动，甚至在小分辨率中使圆形不规则，如两个示例图像中所示。我知道问题的来源，但我不知道如何解决它：它是一个高度问题。宽度总是受到尊重，但不是高度。我假装通过在定位按钮时改变高度和宽度来解决它，但是比例也没有保持不同的分辨率。我已经尝试解决这个问题一段时间，但我不能。我很感激你的帮助。这是代码：

public class MainActivity extends AppCompatActivity {
View pulsado;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    //Full screen
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);

    setContentView(R.layout.activity_main);
    //Width and height of the screen
    DisplayMetrics metrics = new DisplayMetrics();
    WindowManager windowManager = (WindowManager) MainActivity.this.getSystemService(Context.WINDOW_SERVICE);
    if (windowManager != null) {
        windowManager.getDefaultDisplay().getMetrics(metrics);
    }
    int width = metrics.widthPixels;
    int height = metrics.heightPixels;
    RelativeLayout layout = (RelativeLayout) findViewById(R.id.layout1); // id del XML
    for (int i = 1; i < 8; i++) {
        RelativeLayout.LayoutParams rel_btn = new RelativeLayout.LayoutParams(
                RelativeLayout.LayoutParams.WRAP_CONTENT, RelativeLayout.LayoutParams.WRAP_CONTENT);
        // Size of BUTTONs
        rel_btn.width = Math.round((float) (3.6*width/100)); rel_btn.height = Math.round((float) (5.8*height/100));
        // Position of BUTTONs
        switch(i) {
            case 1: rel_btn.leftMargin = Math.round((float) (9.9*width/100)); rel_btn.topMargin = Math.round((float) (24.75*height/100)); break;
            case 2: rel_btn.leftMargin = Math.round((float) (25.45*width/100)); rel_btn.topMargin = Math.round((float) (22.0*height/100)); break;
            case 3: rel_btn.leftMargin = Math.round((float) (38.75*width/100)); rel_btn.topMargin = Math.round((float) (31.7*height/100)); break;
            case 4: rel_btn.leftMargin = Math.round((float) (53.2*width/100)); rel_btn.topMargin = Math.round((float) (44.4*height/100)); break;
            case 5: rel_btn.leftMargin = Math.round((float) (79.5*width/100)); rel_btn.topMargin = Math.round((float) (49.2*height/100)); break;
            case 6: rel_btn.leftMargin = Math.round((float) (57.8*width/100)); rel_btn.topMargin = Math.round((float) (66.2*height/100)); break;
            case 7: rel_btn.leftMargin = Math.round((float) (74.3*width/100)); rel_btn.topMargin = Math.round((float) (69.45*height/100)); break;
        }
        Button btnTag = new Button(this);
        btnTag.setLayoutParams(rel_btn);
        btnTag.setBackgroundColor(Color.TRANSPARENT);
        btnTag.setId(0+1); // writes the ID
        btnTag.setOnClickListener(prueba);
        layout.addView(btnTag);
    }
}
private View.OnClickListener prueba = new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (pulsado != null) {
            Button button1 = (Button) pulsado;
            button1.setBackgroundColor(Color.TRANSPARENT);
        }

        //Width of the screen
        DisplayMetrics metrics = new DisplayMetrics();
        WindowManager windowManager = (WindowManager) MainActivity.this.getSystemService(Context.WINDOW_SERVICE);
        if (windowManager != null) {
            windowManager.getDefaultDisplay().getMetrics(metrics);
        }
        int width = metrics.widthPixels;
        Button button = (Button) view;
        GradientDrawable drawable = new GradientDrawable();
        drawable.setShape(GradientDrawable.OVAL);
        drawable.setStroke(Math.round((float) (0.6*width/100)), Color.RED);
        drawable.setColor(Color.TRANSPARENT);
        button.setBackgroundDrawable(drawable);
        pulsado = view;
    }
    };

}