如何多次更新TextView

TextView textView = findViewById(R.id.textView);
textView.setText("Hello World");

TextView textView = findViewById(R.id.textView);
textView.append("Hello ");
textView.append("World");

TextView textView = findViewById(R.id.textView);
SpannableString spannableString = new SpannableString("Hello World");
spannableString.setSpan(new ForegroundColorSpan(Color.RED), 0, 5, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
spannableString.setSpan(new ForegroundColorSpan(Color.BLUE), 6, 11, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(spannableString);

TextView textView = findViewById(R.id.textView);
Handler handler = new Handler(Looper.getMainLooper()) {
    @Override
    public void handleMessage(Message msg) {
        textView.setText("Hello World");
    }
};

Thread thread = new Thread(new Runnable() {
    @Override
    public void run() {
        // 模拟耗时操作
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        
        // 发送消息给Handler
        handler.sendEmptyMessage(0);
    }
});
thread.start();