Hi i have 2 activities one called login and other one select_company
The login works fine but i cant seem to get it to change activities
This is class is called with the following code:
public class Check_Login extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", Username));
params.add(new BasicNameValuePair("password", Password));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest("http://mobirep.co.za/server_scripts/check_login/check_login.php", "GET", params);
// Check your log cat for JSON reponse
Log.d("Status: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt("success");
TAG_SUCCESS = json.getString("success");
if (success == 1) {
JSONArray login_details_onj = json.getJSONArray("login");
JSONObject login_details = login_details_onj.getJSONObject(0);
// Get The Data
Name = login_details.getString(TAG_NAME);
ID = login_details.getString(TAG_ID);
Company_ID = login_details.getString(TAG_COMPANY);
}
else
{
TAG_NAME = json.getString("success");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
// dismiss the dialog after getting all products
//pDialog.dismiss();
// updating UI from Background Thread
runOnUiThread(new Runnable() {
public void run() {
pDialog.dismiss();
Intent Select_company = new Intent(Login.this, Select_Company.class);
startActivity(Select_company);
}
});
}
}
As soon as the doinbackground is finished it give me errors.
Whene the success = 1, the thread must stop, send data and load the select_company activity
Here is my LogCat:
05-14 13:39:51.863: E/Trace(4070): error opening trace file: No such file or directory (2)
05-14 13:39:53.273: D/dalvikvm(4070): GC_FOR_ALLOC freed 70K, 7% free 2598K/2792K, paused 154ms, total 161ms
05-14 13:39:53.422: I/dalvikvm-heap(4070): Grow heap (frag case) to 7.192MB for 4760016-byte allocation
05-14 13:39:53.752: D/dalvikvm(4070): GC_FOR_ALLOC freed 3K, 3% free 7243K/7444K, paused 228ms, total 228ms
05-14 13:39:54.082: D/dalvikvm(4070): GC_CONCURRENT freed <1K, 3% free 7251K/7444K, paused 10ms+53ms, total 291ms
05-14 13:39:55.083: I/Choreographer(4070): Skipped 42 frames! The application may be doing too much work on its main thread.
05-14 13:39:55.452: D/gralloc_goldfish(4070): Emulator without GPU emulation detected.
05-14 13:39:56.082: I/Choreographer(4070): Skipped 33 frames! The application may be doing too much work on its main thread.
05-14 13:40:04.203: I/Choreographer(4070): Skipped 65 frames! The application may be doing too much work on its main thread.
05-14 13:40:04.443: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:04.982: I/Choreographer(4070): Skipped 47 frames! The application may be doing too much work on its main thread.
05-14 13:40:05.673: I/Choreographer(4070): Skipped 144 frames! The application may be doing too much work on its main thread.
05-14 13:40:05.823: I/Choreographer(4070): Skipped 36 frames! The application may be doing too much work on its main thread.
05-14 13:40:05.962: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:06.162: I/Choreographer(4070): Skipped 45 frames! The application may be doing too much work on its main thread.
05-14 13:40:06.334: I/Choreographer(4070): Skipped 40 frames! The application may be doing too much work on its main thread.
05-14 13:40:07.313: I/Choreographer(4070): Skipped 77 frames! The application may be doing too much work on its main thread.
05-14 13:40:07.453: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:07.672: I/Choreographer(4070): Skipped 52 frames! The application may be doing too much work on its main thread.
05-14 13:40:08.244: I/Choreographer(4070): Skipped 35 frames! The application may be doing too much work on its main thread.
05-14 13:40:08.382: I/Choreographer(4070): Skipped 34 frames! The application may be doing too much work on its main thread.
05-14 13:40:08.853: I/Choreographer(4070): Skipped 98 frames! The application may be doing too much work on its main thread.
05-14 13:40:09.052: I/Choreographer(4070): Skipped 33 frames! The application may be doing too much work on its main thread.
05-14 13:40:09.644: I/Choreographer(4070): Skipped 35 frames! The application may be doing too much work on its main thread.
05-14 13:40:10.083: I/Choreographer(4070): Skipped 39 frames! The application may be doing too much work on its main thread.
05-14 13:40:10.413: I/Choreographer(4070): Skipped 48 frames! The application may be doing too much work on its main thread.
05-14 13:40:10.582: I/Choreographer(4070): Skipped 38 frames! The application may be doing too much work on its main thread.
05-14 13:40:10.922: I/Choreographer(4070): Skipped 42 frames! The application may be doing too much work on its main thread.
05-14 13:40:11.062: I/Choreographer(4070): Skipped 34 frames! The application may be doing too much work on its main thread.
05-14 13:40:11.312: I/Choreographer(4070): Skipped 58 frames! The application may be doing too much work on its main thread.
05-14 13:40:11.452: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:11.634: I/Choreographer(4070): Skipped 44 frames! The application may be doing too much work on its main thread.
05-14 13:40:12.072: I/Choreographer(4070): Skipped 36 frames! The application may be doing too much work on its main thread.
05-14 13:40:12.222: I/Choreographer(4070): Skipped 35 frames! The application may be doing too much work on its main thread.
05-14 13:40:12.422: I/Choreographer(4070): Skipped 48 frames! The application may be doing too much work on its main thread.
05-14 13:40:12.622: I/Choreographer(4070): Skipped 47 frames! The application may be doing too much work on its main thread.
05-14 13:40:12.763: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:13.033: I/Choreographer(4070): Skipped 42 frames! The application may be doing too much work on its main thread.
05-14 13:40:13.193: I/Choreographer(4070): Skipped 37 frames! The application may be doing too much work on its main thread.
05-14 13:40:13.532: I/Choreographer(4070): Skipped 54 frames! The application may be doing too much work on its main thread.
05-14 13:40:13.682: I/Choreographer(4070): Skipped 36 frames! The application may be doing too much work on its main thread.
05-14 13:40:13.882: I/Choreographer(4070): Skipped 47 frames! The application may be doing too much work on its main thread.
05-14 13:40:14.092: I/Choreographer(4070): Skipped 45 frames! The application may be doing too much work on its main thread.
05-14 13:40:14.573: I/Choreographer(4070): Skipped 59 frames! The application may be doing too much work on its main thread.
05-14 13:40:14.922: I/Choreographer(4070): Skipped 47 frames! The application may be doing too much work on its main thread.
05-14 13:40:15.292: I/Choreographer(4070): Skipped 32 frames! The application may be doing too much work on its main thread.
05-14 13:40:16.284: I/Choreographer(4070): Skipped 44 frames! The application may be doing too much work on its main thread.
05-14 13:40:16.442: I/Choreographer(4070): Skipped 33 frames! The application may be doing too much work on its main thread.
05-14 13:40:16.632: D/Status:(4070): {"success":1,"login":[{"id":"1","company_id":"1","name":"Andre"}]}
05-14 13:40:16.852: I/Choreographer(4070): Skipped 33 frames! The application may be doing too much work on its main thread.
05-14 13:40:17.103: D/AndroidRuntime(4070): Shutting down VM
05-14 13:40:17.133: W/dalvikvm(4070): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
05-14 13:40:17.222: E/AndroidRuntime(4070): FATAL EXCEPTION: main
05-14 13:40:17.222: E/AndroidRuntime(4070): java.lang.NullPointerException
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.content.ContextWrapper.getPackageName(ContextWrapper.java:135)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.content.ComponentName.<init>(ComponentName.java:75)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.content.Intent.<init>(Intent.java:3491)
05-14 13:40:17.222: E/AndroidRuntime(4070): at com.mobirep.app.Login$Check_Login$1.run(Login.java:170)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.os.Handler.handleCallback(Handler.java:725)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.os.Handler.dispatchMessage(Handler.java:92)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.os.Looper.loop(Looper.java:137)
05-14 13:40:17.222: E/AndroidRuntime(4070): at android.app.ActivityThread.main(ActivityThread.java:5041)
05-14 13:40:17.222: E/AndroidRuntime(4070): at java.lang.reflect.Method.invokeNative(Native Method)
05-14 13:40:17.222: E/AndroidRuntime(4070): at java.lang.reflect.Method.invoke(Method.java:511)
05-14 13:40:17.222: E/AndroidRuntime(4070): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
05-14 13:40:17.222: E/AndroidRuntime(4070): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
05-14 13:40:17.222: E/AndroidRuntime(4070): at dalvik.system.NativeStart.main(Native Method)
Here is my login.java:
package com.mobirep.app;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.NameValuePair;
import org.apache.http.message.BasicNameValuePair;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import android.support.v7.app.ActionBarActivity;
import android.support.v4.app.Fragment;
import android.app.ProgressDialog;
import android.content.Intent;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
public class Login extends ActionBarActivity {
//
private static ProgressDialog pDialog;
// Creating JSON Parser object
JSONParser jParser = new JSONParser();
static String TAG_SUCCESS = "success";
String TAG_ID = "id";
String TAG_NAME = "name";
String TAG_COMPANY = "company_id";
//buttons
public static String Username;
public static String Password;
static String Name, Company_ID, ID;
//
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_login);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment()).commit();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.login, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_login,
container, false);
Button btnLogin = (Button) rootView.findViewById(R.id.btnLogin);
btnLogin.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
EditText edtUsername = (EditText)getActivity().findViewById(R.id.edtUsername);
Username = edtUsername.getText().toString();
EditText edtPassword = (EditText)getActivity().findViewById(R.id.edtPassword);
Password = edtPassword.getText().toString();
// Toast for debugging purposes
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Checking Details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
Login myActivity = new Login();
Login.Check_Login asyncTask = myActivity.new Check_Login();
asyncTask.execute();
}
});
return rootView;
}
}
public class Check_Login extends AsyncTask<String, String, String> {
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", Username));
params.add(new BasicNameValuePair("password", Password));
// getting JSON string from URL
JSONObject json = jParser.makeHttpRequest("http://mobirep.co.za/server_scripts/check_login/check_login.php", "GET", params);
// Check your log cat for JSON reponse
Log.d("Status: ", json.toString());
try {
// Checking for SUCCESS TAG
int success = json.getInt("success");
TAG_SUCCESS = json.getString("success");
if (success == 1) {
JSONArray login_details_onj = json.getJSONArray("login");
JSONObject login_details = login_details_onj.getJSONObject(0);
// Get The Data
Name = login_details.getString(TAG_NAME);
ID = login_details.getString(TAG_ID);
Company_ID = login_details.getString(TAG_COMPANY);
}
else
{
TAG_NAME = json.getString("success");
}
} catch (JSONException e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
runOnUiThread(new Runnable() {
public void run() {
pDialog.dismiss();
Intent Select_company = new Intent(Login.this, Select_Company.class);
startActivity(Select_company);
}
});
}
}
}
解決
public class Login extends ActionBarActivity {
Login is a Activity class. You are instantiating a Activity class Login myActivity = new Login(); which is wrong
You have
Intent Select_company = new Intent(Login.this, Select_Company.class);
startActivity(Select_company);
You need a valid Context as the first param for the Intent constructor and also startActivity is a method of Activity.
What you need to do is pass valid context from the Activity to the constructor of the class and use the context as the first param for intent and use context.startActivtiy
Edit:
Just have this in Fragment
new Check_Login(getActivity()).execute(Username,Password);
Then Move AsyncTask class out of Login class to a separate .java file
public class Check_Login extends AsyncTask<String, String, String> {
Context context;
ProgressDialog pDialog;
static String TAG_SUCCESS = "success";
String TAG_ID = "id";
String TAG_NAME = "name";
String TAG_COMPANY = "company_id";
static String Name, Company_ID, ID;
public Check_Login(Context context) {
// TODO Auto-generated constructor stub
this.context =context;
pDialog = new ProgressDialog(context);
pDialog.setMessage("Checking Details. Please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
/**
* Before starting background thread Show Progress Dialog
* */
@Override
protected void onPreExecute() {
super.onPreExecute();
}
/**
* getting All products from url
* */
protected String doInBackground(String... args) {
// Building Parameters
try {
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username", args[0]));
params.add(new BasicNameValuePair("password", args[1]));
// getting JSON string from URL
HttpClient client = new DefaultHttpClient();
HttpPost httpGet = new HttpPost("http://mobirep.co.za/server_scripts/check_login/check_login.php");
httpGet.setEntity(new UrlEncodedFormEntity(params));
HttpResponse res = client.execute(httpGet);
String jsonres = EntityUtils.toString(res.getEntity());
JSONObject json = new JSONObject(jsonres);
// Check your log cat for JSON reponse
Log.d("Status: ", json.toString());
// Checking for SUCCESS TAG
int success = json.getInt("success");
TAG_SUCCESS = json.getString("success");
if (success == 1) {
JSONArray login_details_onj = json.getJSONArray("login");
JSONObject login_details = login_details_onj.getJSONObject(0);
// Get The Data
Name = login_details.getString(TAG_NAME);
ID = login_details.getString(TAG_ID);
Company_ID = login_details.getString(TAG_COMPANY);
}
else
{
TAG_NAME = json.getString("success");
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
/**
* After completing background task Dismiss the progress dialog
* **/
protected void onPostExecute(String file_url) {
{
pDialog.dismiss();
Intent Select_company = new Intent(context, Select_Company.class);
context.startActivity(Select_company);
}
}
}
https://stackoverflow.com/questions/23656505
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