Android以编程方式更改按钮的文本颜色

Question

我在linearlayout horizo​​ntalscrollview中动态创建按钮,然后单击我获得选定的按钮位置.

我想知道如何更改所选按钮的文字颜色？

这是我的代码.

String[] categories = {"SUN","MON", "TUS", "WED", "THU", "FRI", "SAT", "SUN","MON", "TUS", "WED", "THU", "FRI", "SAT"};
private LinearLayout ll;
Button btn;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    ll = (LinearLayout) findViewById(R.id.hsvLinearLayout);

    for(int i = 0; i < categories.length; i++) {
        btn = new Button(this);
        btn.setText(categories[i]);
        btn.setBackgroundColor(Color.parseColor("#ffffff"));
        btn.setOnClickListener(buttonClick);
        ll.addView(btn);
        int idx = ll.indexOfChild(btn);
        btn.setTag(Integer.toString(idx));
       // btn.setId(idx);
    }
}

OnClickListener buttonClick = new OnClickListener() {
    public void onClick(View v) {
        String idxStr = Integer.toString(ll.indexOfChild(v));
        //(String)v.getTag();
        Toast.makeText(MainActivity.this, idxStr, 6000).show();
    }
};

Answer 1

检查类型并指定文本颜色

 OnClickListener buttonClick = new OnClickListener() {
        public void onClick(View v) {
            String idxStr = Integer.toString(ll.indexOfChild(v));
            if(v instanceof Button){
               ((Button)v).setTextColor(Color.parseColor("#000000"));
            }
            Toast.makeText(MainActivity.this, idxStr, 6000).show();
        }
    };