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Asked: 2026-06-09T22:04:58+00:00

After i implement my login codes into the async task doInBackground method, my application

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After i implement my login codes into the async task doInBackground method, my application crashes. I needed this help because if i dont implement async task for login, my application in the real device will crash due to policy issue. Can i konw where my errors is?

Below is my doInBackground task:

// Checking login in background
    protected String doInBackground(String... params) {
        String email = inputEmail.getText().toString();
        String password = inputPassword.getText().toString();
        UserFunctions userFunction = new UserFunctions();
        JSONObject json = userFunction.loginUser(email, password);

        // check for login response
        try {
            if (json.getString(KEY_SUCCESS) != null) {
                loginErrorMsg.setText("");
                String res = json.getString(KEY_SUCCESS);
                if (Integer.parseInt(res) == 1) {
                    // user successfully logged in
                    // Store user details in SQLite Database
                    DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                    JSONObject json_user = json.getJSONObject("user");

                    // Clear all previous data in database
                    userFunction.logoutUser(getApplicationContext());
                    db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));

                    // Launch HomePage Screen
                    Intent homepage = new Intent(getApplicationContext(), HomepageActivity.class);

                    // Close all views before launching HomePage
                    homepage.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                    startActivity(homepage);

                    // Close Login Screen
                    finish();
                } else {
                    // Error in login
                    loginErrorMsg.setText("Incorrect username/password");
                }
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return null;
    }

And here is my logcat:

08-18 22:34:59.088: E/JSON(382): {"tag":"login","success":1,"error":0,"uid":"502cfeb2e60004.54904838","user":{"name":"user1","email":"user1@gmail.com","created_at":"2012-08-16 22:07:46","updated_at":null}}
08-18 22:34:59.137: E/AndroidRuntime(382): FATAL EXCEPTION: AsyncTask #1
08-18 22:34:59.137: E/AndroidRuntime(382): java.lang.RuntimeException: An error occured while executing doInBackground()
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.os.AsyncTask$3.done(AsyncTask.java:200)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.FutureTask.run(FutureTask.java:137)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.lang.Thread.run(Thread.java:1096)
08-18 22:34:59.137: E/AndroidRuntime(382): Caused by: android.view.ViewRoot$CalledFromWrongThreadException: Only the original thread that created a view hierarchy can touch its views.
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.view.ViewRoot.checkThread(ViewRoot.java:2802)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.view.ViewRoot.invalidateChild(ViewRoot.java:607)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.view.ViewRoot.invalidateChildInParent(ViewRoot.java:633)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.view.ViewGroup.invalidateChild(ViewGroup.java:2505)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.view.View.invalidate(View.java:5139)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.widget.TextView.checkForRelayout(TextView.java:5364)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.widget.TextView.setText(TextView.java:2688)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.widget.TextView.setText(TextView.java:2556)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.widget.TextView.setText(TextView.java:2531)
08-18 22:34:59.137: E/AndroidRuntime(382):  at com.stts.sparetimetradingsystem.LoginActivity$Login.doInBackground(LoginActivity.java:119)
08-18 22:34:59.137: E/AndroidRuntime(382):  at com.stts.sparetimetradingsystem.LoginActivity$Login.doInBackground(LoginActivity.java:1)
08-18 22:34:59.137: E/AndroidRuntime(382):  at android.os.AsyncTask$2.call(AsyncTask.java:185)
08-18 22:34:59.137: E/AndroidRuntime(382):  at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
08-18 22:34:59.137: E/AndroidRuntime(382):  ... 4 more
08-18 22:35:01.867: E/WindowManager(382): Activity com.stts.sparetimetradingsystem.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f0a510 that was originally added here
08-18 22:35:01.867: E/WindowManager(382): android.view.WindowLeaked: Activity com.stts.sparetimetradingsystem.LoginActivity has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@44f0a510 that was originally added here
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewRoot.<init>(ViewRoot.java:247)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.Window$LocalWindowManager.addView(Window.java:424)
08-18 22:35:01.867: E/WindowManager(382):   at android.app.Dialog.show(Dialog.java:241)
08-18 22:35:01.867: E/WindowManager(382):   at com.stts.sparetimetradingsystem.LoginActivity$Login.onPreExecute(LoginActivity.java:106)
08-18 22:35:01.867: E/WindowManager(382):   at android.os.AsyncTask.execute(AsyncTask.java:391)
08-18 22:35:01.867: E/WindowManager(382):   at com.stts.sparetimetradingsystem.LoginActivity$1.onClick(LoginActivity.java:60)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.View.performClick(View.java:2408)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.View.onKeyUp(View.java:4121)
08-18 22:35:01.867: E/WindowManager(382):   at android.widget.TextView.onKeyUp(TextView.java:4431)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.KeyEvent.dispatch(KeyEvent.java:1061)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.View.dispatchKeyEvent(View.java:3740)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
08-18 22:35:01.867: E/WindowManager(382):   at android.widget.ScrollView.dispatchKeyEvent(ScrollView.java:318)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:788)
08-18 22:35:01.867: E/WindowManager(382):   at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:1667)
08-18 22:35:01.867: E/WindowManager(382):   at com.android.internal.policy.impl.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1102)
08-18 22:35:01.867: E/WindowManager(382):   at android.app.Activity.dispatchKeyEvent(Activity.java:2063)
08-18 22:35:01.867: E/WindowManager(382):   at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:1643)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewRoot.deliverKeyEventToViewHierarchy(ViewRoot.java:2471)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewRoot.handleFinishedEvent(ViewRoot.java:2441)
08-18 22:35:01.867: E/WindowManager(382):   at android.view.ViewRoot.handleMessage(ViewRoot.java:1735)
08-18 22:35:01.867: E/WindowManager(382):   at android.os.Handler.dispatchMessage(Handler.java:99)
08-18 22:35:01.867: E/WindowManager(382):   at android.os.Looper.loop(Looper.java:123)
08-18 22:35:01.867: E/WindowManager(382):   at android.app.ActivityThread.main(ActivityThread.java:4627)
08-18 22:35:01.867: E/WindowManager(382):   at java.lang.reflect.Method.invokeNative(Native Method)
08-18 22:35:01.867: E/WindowManager(382):   at java.lang.reflect.Method.invoke(Method.java:521)
08-18 22:35:01.867: E/WindowManager(382):   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
08-18 22:35:01.867: E/WindowManager(382):   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
08-18 22:35:01.867: E/WindowManager(382):   at dalvik.system.NativeStart.main(Native Method)
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1 Answer

  1. Editorial Team

    You are updating the view in the doInBackground function which happens in the background thread. View should always be updated in the UI thread. To solve this, you can return the JSONObject from the doInBackground function and do the processing in the onPostExecute method.

    Move the try block after userFunction.loginUser(email, password); to onPostExecute.

    protected String doInBackground(String... params) {
    String email = inputEmail.getText().toString();
    String password = inputPassword.getText().toString();
    UserFunctions userFunction = new UserFunctions();
    JSONObject json = userFunction.loginUser(email, password);

    return json;
}

protected void onPostExecute(JSONObject json) {

    // check for login response
    try {
        if (json.getString(KEY_SUCCESS) != null) {
            loginErrorMsg.setText("");
            String res = json.getString(KEY_SUCCESS);
            if (Integer.parseInt(res) == 1) {
                // user successfully logged in
                // Store user details in SQLite Database
                DatabaseHandler db = new DatabaseHandler(getApplicationContext());
                JSONObject json_user = json.getJSONObject("user");

                // Clear all previous data in database
                userFunction.logoutUser(getApplicationContext());
                db.addUser(json_user.getString(KEY_NAME), json_user.getString(KEY_EMAIL), json.getString(KEY_UID), json_user.getString(KEY_CREATED_AT));

                // Launch HomePage Screen
                Intent homepage = new Intent(getApplicationContext(), HomepageActivity.class);

                // Close all views before launching HomePage
                homepage.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
                startActivity(homepage);

                // Close Login Screen
                finish();
            } else {
                // Error in login
                loginErrorMsg.setText("Incorrect username/password");
            }
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}
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