Android一些小技巧

1:设置选中图片的背景颜色
this. gridviewToolbar = (GridView) super.findViewById(R.id.gridviewbar);
this. gridviewToolbar.setSelector(new ColorDrawable(Color.TRANSPARENT));

2:通过屏幕的长度，宽度来定义控件的长宽
this.width = super.getWindowManager().getDefaultDisplay().getWidth()
/ this.menu_img.length;
this.height = super.getWindowManager().getDefaultDisplay().getHeight() / 8;


4:取消标题,必须在设置布局文件之前取消掉
super.requestWindowFeature(Window.FEATURE_NO_TITLE);