StringIndexOutofBoundsException when trying to setBackgroundColor using a variable inside a Adapter

Question

When I try to place a String variable, with hexadecimal color inside to set the setbackgroundcolor(Color.parseColor(String s)) of a edittext on my adapter class, it says

StringIndexOutofBoundsException, length = 0, index = 0.

When I insert the String inside the parseColor by hand, for example parseColor("#ffffff");, It works!

My Adapter Class:

public class TasksAdapter extends ArrayAdapter<Tasks> {
    private Context sContext;
    private List<Tasks> taskData = new ArrayList<>();
    public TasksAdapter(@NonNull Context context, @SuppressLint("SupportAnnotationUsage") @LayoutRes ArrayList<Tasks> list){
        super(context, 0, list);
        sContext = context;
        taskData = list;
    }
    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent){
        View listItem = convertView;
        if(listItem == null)
            listItem = LayoutInflater.from(sContext).inflate(R.layout.item_tasks, parent,false);
        final Tasks presenteTask = taskData.get(position);
        TextView taskTitle = (TextView) listItem.findViewById(R.id.tasksTitle);
        taskTitle.setText(presenteTask.getTitle());
        EditText taskColor = (EditText) listItem.findViewById(R.id.taskColor);
        taskColor.setBackgroundColor(Color.parseColor(presenteTask.getHexaColor()));
        return listItem;
    }
}

The error:

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.mylcm, PID: 672 java.lang.StringIndexOutOfBoundsException: length=0; index=0 at java.lang.String.charAt(Native Method) at android.graphics.Color.parseColor(Color.java:1384) at com.example.mylcm.Utils.Adapters.TasksAdapter.getView(TasksAdapter.java:49) at android.widget.AbsListView.obtainView(AbsListView.java:2365) at android.widget.ListView.makeAndAddView(ListView.java:2052) at android.widget.ListView.fillDown(ListView.java:786) at android.widget.ListView.fillFromTop(ListView.java:847) at android.widget.ListView.layoutChildren(ListView.java:1826) at android.widget.AbsListView.onLayout(AbsListView.java:2164) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791) at android.widget.LinearLayout.layoutHorizontal(LinearLayout.java:1780) at android.widget.LinearLayout.onLayout(LinearLayout.java:1546) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1083) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635) at android.widget.LinearLayout.onLayout(LinearLayout.java:1544) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1791) at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1635) at android.widget.LinearLayout.onLayout(LinearLayout.java:1544) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323) at android.widget.FrameLayout.onLayout(FrameLayout.java:261) at com.android.internal.policy.DecorView.onLayout(DecorView.java:761) at android.view.View.layout(View.java:19659) at android.view.ViewGroup.layout(ViewGroup.java:6075) at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2496) at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2212) at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1392) at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6752) at android.view.Choreographer$CallbackRecord.run(Choreographer.java:911) at android.view.Choreographer.doCallbacks(Choreographer.java:723) at android.view.Choreographer.doFrame(Choreographer.java:658) at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:897) at android.os.Handler.handleCallback(Handler.java:790) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:164) at android.app.ActivityThread.main(ActivityThread.java:6494) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)

I would guess that presenteTask.getHexaColor() returns an empty string. Tried debugging it, like: tracing the value that gets passed into the method? — GhostCat
@GhostCat I tried debugging it, and the value that i see there is the correct string... i don't know why it still pass me that error — Vitorlsa
Are you sure you went through every item in the adapter? It's definitely trying to parse a string that is empty. Maybe add log output so you don't have to step through every single item. — dymmeh
Are you setting breakpoints inside getView()? You should verify the Task item right before the parse call. — Jarvis
Pull the presenteTask.getHexaColor() out of the parseColor call and set the returned value. Then set a conditional breakpoint or add an if statement, to check the String contents, for debugging. It will be easier to see if every iteration is returning a valid string. — Reger05

Md. Asaduzzaman Md. Asaduzzaman · Accepted Answer · 2019-10-22T18:30:26

Inside getView() of TaskAdapter one of your taskData item return empty hexaColor during execution of presenteTask.getHexaColor(). Try below code, it will stop your application being force closed and you will get the position of item causing exception inside catch.

public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent){
    View listItem = convertView;
    if(listItem == null)
        listItem = LayoutInflater.from(sContext).inflate(R.layout.item_tasks, parent,false);

    try {
        final Tasks presenteTask = taskData.get(position);
        TextView taskTitle = (TextView) listItem.findViewById(R.id.tasksTitle);
        taskTitle.setText(presenteTask.getTitle());
        EditText taskColor = (EditText) listItem.findViewById(R.id.taskColor);
        taskColor.setBackgroundColor(Color.parseColor(presenteTask.getHexaColor()));
    } catch(Exception ex) {
        Log.v(TasksAdapter.class.getSimpleName(), "Exception at: " + position);
    }

    return listItem;
}

StringIndexOutofBoundsException when trying to setBackgroundColor using a variable inside a Adapter

2 Answers