java - 一个按钮如何多次更改 textView 颜色？

Question

我正在尝试让一个按钮将 textView 的颜色更改为白色，但在第二次按下时将其更改为蓝色，第三次按下为红色，依此类推。当我尝试它时，它显然只选择了最后一个（红色）并且不会再改变。有人知道我该怎么做吗？真的卡住了。这是代码：

 protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
    setContentView(R.layout.activity_main);
    dc1 = (TextView)findViewById(R.id.digitalClock1);
    bt1 = (Button)findViewById(R.id.button1);

    Handler handler = new RandomMoveHandler((TextView) findViewById(R.id.digitalClock1));
    handler.sendEmptyMessage(0);

    bt1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            dc1.setTextColor(Color.WHITE);
            dc1.setTextColor(Color.BLUE);
            dc1.setTextColor(Color.RED);
        }
    });

}

Answer 1

private int count = 0;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
dc1 = (TextView)findViewById(R.id.digitalClock1);
bt1 = (Button)findViewById(R.id.button1);

Handler handler = new RandomMoveHandler((TextView) findViewById(R.id.digitalClock1));
handler.sendEmptyMessage(0);

  bt1.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        switch(count)
        {
         case 0: dc1.setTextColor(Color.WHITE); count++; break;
         case 1: dc1.setTextColor(Color.BLUE); count++; break;
         case 2: dc1.setTextColor(Color.RED); count = 0; break;
        }
    }
});

Answer 2

int[] colors = {Color.WHITE, Color.BLUE, Color.RED };

  bt1.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {

            Integer tag = (v.getTag() == null) ? 0 : (Integer)v.getTag();
            int color = colors[tag];
            dc1.setTextColor(color);
            v.setTag((tag+1)%colors.length);
        }
    });

我现在不能尝试。检查错字

Answer 3

尝试这个 ：

 int [] colors = new int[]{Color.WHITE, Color.BLUE, Color.RED};
    int index = 0;
    bt1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                dc1.setTextColor(colors[index]);
                index++;
                if(index == colors.length)
                  index = 0;
            }
        });

Answer 4

好吧，看起来像一个初学者的问题。您现在正在做的是，当您单击按钮时，onClick()会调用该方法，然后将颜色设置为白色，然后是蓝色，然后是红色。你想做的是更像其他答案

Answer 5

您需要计算点击次数，试试这个：

private int flag = 0;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        setContentView(R.layout.activity_main2);
        dc1 = (TextView) findViewById(R.id.digitalClock1);
        bt1 = (Button) findViewById(R.id.button1);

        bt1.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                // TODO Auto-generated method stub
                if (flag == 0)
                    dc1.setTextColor(Color.WHITE);
                else if (flag == 1)
                    dc1.setTextColor(Color.BLUE);
                else if (flag == 2)
                    dc1.setTextColor(Color.RED);

                if (flag++ >= 2)
                    flag = 0;
            }
        });