private SeekBar seekBarA,seekBarR,seekBarG,seekBarB;
    private TextView tvRGB,tvHex,tvColor;

    int a=255,r=255,g=255,b=255;

        //實做
        initView();

    private void initView() {
        seekBarA = findViewById(R.id.seekBarA);
        seekBarR = findViewById(R.id.seekBarR);
        seekBarG = findViewById(R.id.seekBarG);
        seekBarB = findViewById(R.id.seekBarB);
        seekBarA.setOnSeekBarChangeListener(this);
        seekBarR.setOnSeekBarChangeListener(this);
        seekBarG.setOnSeekBarChangeListener(this);
        seekBarB.setOnSeekBarChangeListener(this);

        tvRGB = findViewById(R.id.tvRGB);
        tvHex = findViewById(R.id.tvHex);
        tvColor = findViewById(R.id.tvColor);
    }