Android里用代码设置View的相关属性

1.setPading

 Button btn1 = (Button) findViewById(R.id.magic);
 btn1.setPadding(10, 10, 10, 10);

2.setMargin

 Button btn1 = (Button) findViewById(R.id.magic);
 LinearLayout.LayoutParams  lp = new LinearLayout.LayoutParams(btn1.getLayoutParams());
 lp.setMargins(10, 10, 10, 10);
 lp.leftMargin=10;
 lp.rightMargin=10;
 lp.topMargin=10;
 lp.bottomMargin=10;

这个 LayoutParams是根据该view在不同的GroupView而不同的

可以把设置margin的方式封装成方法，只要是GroupView里面的LayoutParams 即可。

 public static void setMargins (View v, int l, int t, int r, int b) {
     if (v.getLayoutParams() instanceof ViewGroup.MarginLayoutParams) {
         ViewGroup.MarginLayoutParams p = (ViewGroup.MarginLayoutParams) v.getLayoutParams();
         p.setMargins(l, t, r, b);
         v.requestLayout();
     }
 }

3.set Width Height

 Button btn1 = (Button) findViewById(R.id.magic);
 btn1.getLayoutParams().width=100;

 btn1.getLayoutParams().height=100;

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