【发布时间】：2016-04-14 18:22:49
【问题描述】：
我正在尝试通过 JSON 从我的 android 应用程序向我的数据库添加一些值。
我之前在 eclipse 中使用过以下代码并且运行良好，现在我使用 android studio 尝试它，但它不工作我不知道为什么！
代码：
public class Main2Activity extends AppCompatActivity {
private ProgressDialog pDialog;
JSONParser jsonParser = new JSONParser();
EditText ID;
EditText fname;
EditText lname;
EditText phone;
Button addbtn;
// url to create new product
private static String url_create_product = "http://www.lamia.byethost18.com/add_info.php";
// JSON Node names
private static final String TAG_SUCCESS = "success";
String H,Q,C,Ls;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
ID = (EditText) findViewById(R.id.ID);
lname = (EditText) findViewById(R.id.lname);
fname = (EditText) findViewById(R.id.fname);
phone = (EditText) findViewById(R.id.phone);
H = ID.getText().toString();
Q = lname.getText().toString();
C = fname.getText().toString();
Ls = phone.getText().toString();
addbtn = (Button) findViewById(R.id.addbtn);
addbtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View arg0) {
new CreateNewProduct().execute();
}
});
}
class CreateNewProduct extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(Main2Activity.this);
pDialog.setMessage("Creating Product..");
pDialog.setIndeterminate(false);
pDialog.setCancelable(true);
pDialog.show();
}
/**
* Creating product
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("ID", H));
params.add(new BasicNameValuePair("lname", Q));
params.add(new BasicNameValuePair("fname", C));
params.add(new BasicNameValuePair("phone", Ls));
// getting JSON Object
// Note that create product url accepts POST method
JSONObject json = jsonParser.makeHttpRequest(url_create_product,
"POST", params);
// check log cat fro response
Log.d("Create Response", json.toString());
// check for success tag
try {
int success = json.getInt(TAG_SUCCESS);
if (success == 1) {
// successfully created product
// Intent i = new Intent(getApplicationContext(), AdminExercise.class);
// startActivity(i);
// closing this screen
finish();
} else {
// failed to create product
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog once done
pDialog.dismiss();
}
}
}
我收到了这个错误：
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/JSON Parser: Error parsing data org.json.JSONException: Value <html><body><script of type java.lang.String cannot be converted to JSONObject
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: FATAL EXCEPTION: AsyncTask #4
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: Process: com.example.hatim.maps, PID: 1934
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: java.lang.RuntimeException: An error occurred while executing doInBackground()
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at android.os.AsyncTask$3.done(AsyncTask.java:309)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.FutureTask.setException(FutureTask.java:223)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:242)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String org.json.JSONObject.toString()' on a null object reference
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at com.example.hatim.maps.Main2Activity$CreateNewProduct.doInBackground(Main2Activity.java:113)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at com.example.hatim.maps.Main2Activity$CreateNewProduct.doInBackground(Main2Activity.java:77)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at android.os.AsyncTask$2.call(AsyncTask.java:295)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.FutureTask.run(FutureTask.java:237)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588)
04-14 21:08:36.214 1934-1980/com.example.hatim.maps E/AndroidRuntime: at java.lang.Thread.run(Thread.java:818)
我不明白是什么错误？
有人可以帮忙吗？谢谢！
【问题讨论】：
标签： java android json android-studio