如何在android中创建自定义渐变？

int startColor=Color.parseColor("#a6c1de");
//you can add as many gradient colors as you want here
//and include it in the int array while initializing GradientDrawable 
int endColor=Color.parseColor("#aa82b7");
GradientDrawable mDrawable=new GradientDrawable(Orientation.LEFT_RIGHT,
                                    new int[] {startColor,endColor});

LinearLayout mLayout=(LinearLayout)findViewById(R.id.your_id);
mLayout.setBackgroundDrawable(mDrawable);