Attempt to invoke virtual method 'int android.text.Layout.getLineCount()' on a null object reference

Question

I am getting null pointer exception randomly, usually it works and sometime it crashes, I had searched a lot but didn't get any help as it there is no proper line from where I get any help,

I am also using handler with it.

My logcat error is as follows and code is added below it,

 java.lang.NullPointerException: Attempt to invoke virtual method 'int android.text.Layout.getLineCount()' on a null object reference
 at android.widget.TextView.onMeasure(TextView.java:6703)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
 at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
 at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
 at android.view.View.measure(View.java:17547)
 at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727)
 at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
 at android.support.v7.internal.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436)
 at android.widget.LinearLayout.measureVertical(LinearLayout.java:722)
 at android.widget.LinearLayout.onMeasure(LinearLayout.java:613)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535)
 at android.widget.FrameLayout.onMeasure(FrameLayout.java:436)
 at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615)
 at android.view.View.measure(View.java:17547)
 at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015)
 at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173)
 at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379)
 at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061)
 at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885)
 at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767)
 at android.view.Choreographer.doCallbacks(Choreographer.java:580)
 at android.view.Choreographer.doFrame(Choreographer.java:550)
 at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753)
 at android.os.Handler.handleCallback(Handler.java:739)
 at android.os.Handler.dispatchMessage(Handler.java:95)
 at android.os.Looper.loop(Looper.java:135)
 at android.app.ActivityThread.main(ActivityThread.java:5254)
 at java.lang.reflect.Method.invoke(Native Method)
 at java.lang.reflect.Method.invoke(Method.java:372)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

This is my code as follows, here it usually crash on click of register or forget button on first install and after that it usually works fine but sometime it gives me error,

 public class Login extends AppCompatActivity implements View.OnClickListener,ProcessedResult
 {
    private Handler uiThreadHandler;
    private Context context;
    private EditText ed_password,ed_Username;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_login);

      StorageManager storageManager=new StorageManager(this,"abc");
                    String accessTokenCheck=storageManager.getValue(Constants.SharedPreferences.LACCESSTOKEN, null);
      if(accessTokenCheck!=null)
                        GeneralFunctions.moveToNextActivity(MainActivity.class,this);

      uiThreadHandler = new UIThreadHandler();
      new Thread(new Runnable() {
         @Override
         public void run() {
             init();
         }
        }).start();
       }

       //Initialization part
       private final void init()
       {
          context=this;

          FontsManager.initFormAssets(this, "fonts/Lato-Regular.ttf");
          FontsManager.changeFonts(this);

          TextView myTextView =  GeneralFunctions.findViewByIdAndCast(this, R.id.login_tv_noAccount);
          myTextView.setMovementMethod(new LinkTouchMovementMethod());
                    myTextView.setHighlightColor(getResources().getColor(android.R.color.transparent));
          SpannableString mySpannable = new SpannableString(myTextView.getText().toString());

          TouchableSpan touchableSpan = new TouchableSpan(Color.parseColor("#606060"),getResources().getColor(R.color.colorBlue),Color.TRANSPARENT) {
          @Override
          public void onClick(View textView) {
                            GeneralFunctions.simpleMoveToNextActivity(Register.class, context);
                        }
                    };

          mySpannable.setSpan(touchableSpan, GeneralFunctions.getText(myTextView).indexOf("Register"), GeneralFunctions.getText(myTextView).length(), 0);
          myTextView.setText(mySpannable, TextView.BufferType.SPANNABLE);

          TextView tv_forgetPassword =  GeneralFunctions.findViewByIdAndCast(this,R.id.login_tv_foregetPassword);
                    GeneralFunctions.setTextColorSelector(Color.parseColor("#606060"),getResources().getColor(R.color.colorBlue),tv_forgetPassword);
                    tv_forgetPassword.setOnClickListener(this);

          ed_password = (EditText) findViewById(R.id.login_ed_password);
          ed_Username = (EditText) findViewById(R.id.login_ed_usrName);
          ed_password.setTransformationMethod(new AsteriskPasswordTransformationMethod());

          Button bt_Login= GeneralFunctions.findViewByIdAndCast(this,R.id.login_bt_signin);
                    setSelector(R.drawable.big_green_btn_normal, bt_Login);

          Button bt_linkedInd= GeneralFunctions.findViewByIdAndCast(this,R.id.login_bt_linkedin);
                    setSelector(R.drawable.big_blue_btn_normal, bt_linkedInd);
          }

          private final void setSelector(final int resourceId,final Button button)
          {
              button.setOnClickListener(this);
              try
              {
                String name = getNameofResyrce(activity,resourceId);
                String newString=name.replace("normal","pressed");

                StateListDrawable states = new StateListDrawable();
                states.addState(new int[] {android.R.attr.state_pressed}, getDrawablebyName(activity,newString));
                states.addState(new int[] {android.R.attr.state_focused},getDrawablebyName(activity, newString));
                states.addState(new int[]{}, getDrawablebyName(activity, name));
                if(view instanceof Button)
                   ((Button)view).setBackground(states);
                else
                   if(view instanceof ImageView)
                       ((ImageView)view).setImageDrawable(states);
               } catch (Exception e)
               {
               }
          }


                public static synchronized Drawable getDrawablebyName(Context context,String name)
                {
                    Resources resources = context.getResources();
                    final int resourceId = resources.getIdentifier(name, "drawable", context.getPackageName());
                    return resources.getDrawable(resourceId);
                }

                @Override
                public void onClick(View v) {
                    switch (v.getId())
                    {
                        case R.id.login_bt_linkedin:
                        {
                            DWebView transparentDialog = DWebView.newInstance();
                            showProgressDialog(transparentDialog, Constants.DialogConstants.WEB);
                        }
                        break;
                        case R.id.login_bt_signin:
                            uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.VALIDATION);
                            break;
                        case R.id.login_tv_foregetPassword:
                            GeneralFunctions.simpleMoveToNextActivity_Without_history(ForgetPassword.class, context);
                            break;
                    }
                }

        //Listener part
                @Override
                public <IResponse, IMethod> void processedResult(IResponse iResponse, IMethod iMethod) {
                    switch (iMethod.toString())
                    {
                        case "back":
                            finish();
                            break;
                        case "showProgress":
                         uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.SHOWDIALOG);
                            break;
                        case "hideProgress":
                            uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.HIDEDIALOG);
                            break;
                    }
                }


        //Handler part
                private class UIThreadHandler extends Handler {
                    @Override
                    public void handleMessage(Message msg)
                    {
                        switch (msg.what) {
                            case Constants.ActivityBasicsCode.SETERROR:
                            {
                                CustomException exception=(CustomException)msg.obj;
                                TextView editText=exception.getTextView();
                                editText.setError(exception.getMessage());
                                editText.setFocusable(true);
                                editText.requestFocus();
                            }
                            break;
                            case Constants.ActivityBasicsCode.HIDEDIALOG:
                                hideProgressDialog(Constants.DialogConstants.Transparent);
                                break;
                            case Constants.ActivityBasicsCode.SHOWDIALOG: {
                                DTDialog dtDialog=DTDialog.newInstance();
                                showProgressDialog(dtDialog,Constants.DialogConstants.Transparent);
                            }
                            break;
                            case Constants.ActivityBasicsCode.VALIDATION: {
    //Here validation is done in separate thread
                                new Thread(new Runnable() {
                                    @Override
                                    public void run() {
                                        try
                                        {
                                            if (Validation.validate(Login.this))
                                                GeneralFunctions.moveToNextActivity(MainActivity.class, context);
                                        } catch (CustomException e)
                                            {
    //Catch exception for validation is thrown here
                                                Message message = uiThreadHandler.obtainMessage(Constants.ActivityBasicsCode.SETERROR);
                                                message.obj=e;
                                                uiThreadHandler.sendMessage(message);
                                            }finally {
                                                uiThreadHandler.sendEmptyMessage(Constants.ActivityBasicsCode.HIDEDIALOG);
                                            }
                                        }
                                    }).start();
                                    break;
                                }
                            }
                            super.handleMessage(msg);
                        }
                    }

                public final<T extends DialogFragment> void showProgressDialog(T currentDialog,String tagName)
                {
                    FragmentManager fragmentManager =getSupportFragmentManager();
                    currentDialog.show(fragmentManager, tagName);
                }

                public final void hideProgressDialog(String tagName)
                {
                    FragmentManager fragmentManager =getSupportFragmentManager();
                    DialogFragment transparentDialog = (DialogFragment)fragmentManager.findFragmentByTag(tagName);
                    if (transparentDialog == null) {
                        return;
                    }
                    transparentDialog.dismiss();
                }
            }

XML file

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:layout_gravity="center"
    android:gravity="center">

    <ImageView style="@style/imageview"
        android:layout_marginTop="@dimen/_7sdp"
        android:src="@mipmap/ic_launcher"/>

    <EditText
        android:tag="@string/login_emailId_phone"
        android:layout_marginTop="@dimen/_12sdp"
        style="@style/edittext"
        android:drawableLeft="@drawable/user_icon"
        android:id="@+id/login_ed_emailPhone"
        android:inputType="text"/>

    <EditText
        android:tag="@string/login_password"
        android:layout_marginTop="@dimen/_12sdp"
        android:drawableLeft="@drawable/password_icon"
        android:id="@+id/login_ed_password"
        android:inputType="textPassword"
        android:hint="@string/login_password"
        style="@style/edittext"/>

    <TextView
        android:layout_marginTop="@dimen/_11sdp"
        android:id="@+id/login_tv_foregetPassword"
        android:text="@string/login_forgetPassword"
        style="@style/textView"
        android:textColor="#606060"
        android:textStyle="normal"/>

    <Button
        android:layout_marginTop="@dimen/_30sdp"
        android:id="@+id/login_bt_signin"
        style="@style/button"
        android:text="@string/login_singin"
        android:background="@drawable/big_green_btn_normal"
        />

    <cl.tempclick.ui.custom_view.LineThroughTextView
        android:layout_marginTop="@dimen/_12sdp"
        app:android_textColor="#606060"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:lineHeight="@dimen/_2sdp"
        app:lineColor="@color/colorGray"
        app:android_textSize="@dimen/_15sdp"
        app:android_text="@string/login_or"
        app:textPadding="@dimen/_10sdp"/>

    <Button
        android:layout_marginTop="@dimen/_12sdp"
        android:id="@+id/login_bt_linkedin"
        style="@style/button"
        android:text="@string/login_linkedin"
        android:background="@drawable/big_blue_btn_normal"
        />

    <TextView
        android:layout_marginTop="@dimen/_12sdp"
        android:id="@+id/login_tv_noAccount"
        android:text="@string/login_noAccount"
        style="@style/textView"
        android:textStyle="normal"
        android:textColor="#606060"
        android:layout_marginBottom="@dimen/_7sdp"/>

</LinearLayout>
<ViewStub
    android:id="@+id/login_vs_empty"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="center"
    android:gravity="center"
    android:layout="@layout/empty_view" />

its a `java.lang.NullPointerException` which means the you are trying to use a object or widget which is not yet initialized. show your code. — Murtaza Khursheed Hussain, Nov 23 '15 at 05:37
@mangusta,@AnswerDroid, i had shared my code and sorry as the code is not well formatted and thanks for your help .. — Reprator, Nov 23 '15 at 05:50
@Survivor, i am made my all effort to paste it here but failed so u can acces it from the following link, https://drive.google.com/a/studiotamba.com/file/d/0BwiBPe16lODTdS1CVFloZXR5T1U/view?usp=sharing — Reprator, Nov 26 '15 at 05:22
@Survivor please use this link,https://drive.google.com/file/d/0BwkVxZWl7VcESGZ6RV94MFdzams/view?usp=sharing ,no request is needed after this — Reprator, Nov 26 '15 at 05:37
@Trush, you can find the LineThroughTextView through the following link, https://gist.github.com/TheGreat0004/b0c0c5d80004b2d40eec — Reprator, Nov 26 '15 at 07:43
Even if it is due to threading, then the error must be something like this "Only the parent or main thread can touch it's views", so it's irrelogical that it is due to threading — Reprator, Nov 27 '15 at 11:44
try cleaning your project, and also why is it that for you editextexs you did not use findViewAndCast method ?? — Elltz, Dec 02 '15 at 15:21
@Elltz, current it is just on click and random, i will code it later that's why i hadn't initialized it till now. — Reprator, Dec 04 '15 at 06:04

score 4 · Answer 1 · answered Nov 26 '15 at 04:44

4

You should not be calling init() (or any code that touches the Android UI) in a non-UI thread.

answered Nov 26 '15 at 04:44

cybersam

63,203
6
53
76

that didn't make any difference – Reprator Nov 26 '15 at 05:06
As a new Android dev I always forget that I should not touch UI stuff in a non UI thread, I always do the set of the UI components in the same thread of the DB, now I know why sometimes I get this weird errors. Thx – hmojica Jan 12 '23 at 16:24

score 1 · Answer 2 · edited Feb 20 '19 at 11:30

1

you must call textview getLayout() after the textview measure ,so it's better to call getLayout() in

textview.post(new Runnable() {
    @Override
    public void run() {
        textview.getLayout()....
    }
});

edited Feb 20 '19 at 11:30

Suraj Rao

29,388
11
94
103

answered Feb 20 '19 at 11:21

preqel

11
2

score -1 · Answer 3 · edited Feb 27 '18 at 00:53

-1

Try thread.join() method, in which you are calling init() method.

edited Feb 27 '18 at 00:53

K.Dᴀᴠɪs

9,945
11
33
43

answered Nov 27 '15 at 06:56

Aditi Parikh

1,522
3
13
34

score -1 · Answer 4 · answered Nov 30 '15 at 05:43

-1

I think the error came from this line

mySpannable.setSpan(touchableSpan, GeneralFunctions.getText(myTextView).indexOf("Register"), GeneralFunctions.getText(myTextView).length(), 0);

try to logout you get the index value & textview text from gettext(textview) & indexOf() method.

answered Nov 30 '15 at 05:43

Mobile Application Develope

1
1

@Moblie Application Develo, thanks for the reply, but can u elaborate it as event if it is due to thing then there must be some line number in exception log cat...and as i said that's random. sometime it works and sometime it gives crash. – Reprator Nov 30 '15 at 06:26
can i see your GeneralFunctions code to gettext & indexof.? – Mobile Application Develope Nov 30 '15 at 06:50
You try to pass static value in length & check mySpannable.setSpan(touchableSpan, 0, myTextView.getText().length(), 0); – Mobile Application Develope Nov 30 '15 at 06:59
public static String getText(T editText) { if(editText instanceof EditText) return ((EditText)editText).getText().toString(); else if((editText instanceof Button)) return ((Button)editText).getText().toString(); else if((editText instanceof TextView)) return ((TextView)editText).getText().toString(); return null; } – Reprator Nov 30 '15 at 07:09
This is General functions method getText, and indexof is a inbuilt method of String in java or andorid – Reprator Nov 30 '15 at 07:10
can i see your @style/textView Code – Mobile Application Develope Nov 30 '15 at 09:34
– Reprator Nov 30 '15 at 12:01

Attempt to invoke virtual method 'int android.text.Layout.getLineCount()' on a null object reference

4 Answers4