Android – 随机生成背景色

        final LinearLayout layout= (LinearLayout) findViewById(R.id.id_ll);
        Button btnChangeColor= (Button) findViewById(R.id.id_btn_change_color);
        btnChangeColor.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Random random = new Random();
                int color = Color.argb(255, random.nextInt(256), random.nextInt(256), random.nextInt(256));
                layout.setBackgroundColor(color);
            }
        });