Android Volley post请求在点击时不起作用？

<uses-permission android:name="android.permission.INTERNET" />

RequestQueue queue = Volley.newRequestQueue(getApplicationContext());

StringRequest request = new StringRequest(Request.Method.POST, url,
    new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            // 处理响应
        }
    },
    new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            // 处理错误
        }
    }
) {
    @Override
    protected Map<String, String> getParams() {
        Map<String, String> params = new HashMap<>();
        params.put("key1", "value1");
        params.put("key2", "value2");
        return params;
    }
};
queue.add(request);

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
if (networkInfo != null && networkInfo.isConnected()) {
    // 网络可用
} else {
    // 网络不可用
}