Android：设置x和y位置

Question

我是android新手。我开始尝试构建一个方法库。我在java中更加舒适，并且由于运行时的所有内容似乎都发生在java中，我正在尝试构建处理java中GUI的方法。到目前为止，我没有太多的东西，我正在寻找定义在x和y位置绘制对象的位置。这是我到目前为止有：

//method to get width or Xpos that is a one size fits all 
public int widthRatio(double ratioIn){ 
    DisplayMetrics dm = new DisplayMetrics(); //gets screen properties 
    getWindowManager().getDefaultDisplay().getMetrics(dm); 
    double screenWidth = dm.widthPixels;  //gets screen height 
    double ratio = screenWidth/100;   //gets the ratio in terms of % 
    int displayWidth = (int)(ratio*ratioIn); //multiplies ratio desired % of screen 
    return displayWidth; 
} 

//method to get height or Ypos that is a one size fits all 
public int heightByRatio(double ratioIn){ 
    DisplayMetrics dm = new DisplayMetrics(); //gets screen properties 
    getWindowManager().getDefaultDisplay().getMetrics(dm); 
    double screenHeight = dm.heightPixels; //gets screen height 
    double ratio = screenHeight/100;   //gets the ratio in terms of % 
    int newHeight = (int)(ratio*ratioIn);  //multiplies ratio by desired % of screen 
    return newHeight; 
} 

//sets size of any view (button, text, ...) to a one size fits all screens 
public void setSizeByRatio(View object, int width, int height){ 
    ViewGroup.LayoutParams params = object.getLayoutParams(); // gets params of view 
    params.width = widthRatio(width);       // sets width by portion of screen 
    params.height = heightByRatio(height);     // sets height by portion of screen 
} 

所以，如果我有一个名为Button按钮，和我说 setSizeByRatio（按钮，25，50）;它将按钮高度设置为屏幕的25％，并将其高度设置为任何屏幕的50％。

我的主要问题是你如何设置你想要它开始绘制的x和y位置，就像你在注册java中一样？ 我跑过布局（l，t，r，b）;但它只设置相对于父项的x和y。

下一个问题是什么，至于我应该学习的GUI方法？我知道这会杀死很多人，但我如何评论XML？对于XML来说，我和android一样新。

Answer 1

这并不真正相关，但它清理了一行代码（如果你有更多这样的事情，可以用作清理更多代码行的参考）。

通过这种方式，DisplayMetrics适用于它们两个，而不是每次获得另一个轴时都必须输入它。

//method to get width or Xpos that is a one size fits all 
DisplayMetrics dm = new DisplayMetrics() { // This line now applies to both int and gets screen properties 
public int widthRatio(double ratioIn){ 
    getWindowManager().getDefaultDisplay().getMetrics(dm); 
    double screenWidth = dm.widthPixels;  //gets screen height 
    double ratio = screenWidth/100;   //gets the ratio in terms of % 
    int displayWidth = (int)(ratio*ratioIn); //multiplies ratio desired % of screen 
    return displayWidth; 
} 

//method to get height or Ypos that is a one size fits all 
public int heightByRatio(double ratioIn){ 
    getWindowManager().getDefaultDisplay().getMetrics(dm); 
    double screenHeight = dm.heightPixels; //gets screen height 
    double ratio = screenHeight/100;   //gets the ratio in terms of % 
    int newHeight = (int)(ratio*ratioIn);  //multiplies ratio by desired % of screen 
    return newHeight; 
    } 
}