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String url =「url.php」;如何發送帖子請求使用排球?
ProgressDialog pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
JsonObjectRequest jsonObjReq = new JsonObjectRequest(
Request.Method.POST, url, null,
new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
Log.d("Response", response.toString());
// pDialog.hide();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Eror", "Error: " + error.getMessage());
// pDialog.hide();
}
}) {
@Override
protected Map<String, String> getParams() {
Map<String, String> params = new HashMap<String, String>();
params.put("username", "prp");
params.put("password", "1234");
return params;
}
};
// Adding request to request queue
ApplicationController.getInstance().addToRequestQueue(jsonObjReq);
}
這段代碼有什麼問題?當我運行此代碼「空指針異常」時,「jsonObjReq」可能爲空。我如何解決這個問題?
這是我記錄錯誤
FATAL EXCEPTION: main
java.lang.NullPointerException
at com.sencide.AndroidLogin.signUp(AndroidLogin.java:96)
at com.sencide.AndroidLogin.onClick(AndroidLogin.java:172)
at android.view.View.performClick(View.java:4240)
at android.view.View$PerformClick.run(View.java:17721)
at android.os.Handler.handleCallback(Handler.java:730)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:5103)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:525)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
at dalvik.system.NativeStart.main(Native Method)
我是參考,該鏈接後的數據: - http://arnab.ch/blog/2013/08/asynchronous-http-requests-in-android-using-volley/
'當我運行這段代碼「空指針異常」'請出示日誌 – 2015-02-23 09:47:41
後完全錯誤的logcat。 – Sanket990 2015-02-23 09:53:58
當我調試指針去這行「ApplicationController.getInstance()。addToRequestQueue(jsonObjReq);」。 – 2015-02-23 11:02:27