Use with #getSystemService(String) to retrieve anĪ for Use with #getSystemService(String) to retrieve aĪ for giving the userįeedback for UI events through the registered event listeners.Ī for receiving intents at aĪ for interacting with the globalĪ for receiving intents at aĪ for tracking application operations Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License.ĮxpandableListActivity(IntPtr, JniHandleOwnership)Ī constructor used when creating managed representations of JNI objects called by the runtime. To do this, your own view MUST contain an ExpandableListView object with the id " However, if you desire, you can customize the screen layout by setting your own view layout with setContentView() in onCreate(). Binding, screen layout, and row layout are discussed in the following sections.ĮxpandableListActivity has a default layout that consists of a single, full-screen, centered expandable list. Create an appropriate array and assign it to the id variable.IJavaObject View.IOnCreateContextMenuListener ExpandableListView.IOnChildClickListener ExpandableListView.IOnGroupCollapseListener ExpandableListView.IOnGroupExpandListener IJavaPeerable IDisposable RemarksĪn activity that displays an expandable list of items by binding to a data source implementing the ExpandableListAdapter, and exposes event handlers when the user selects an item.ĮxpandableListActivity hosts a ExpandableListView object that can be bound to different data sources that provide a two-levels of data (the top-level is group, and below each group are children). Yup, that can null because you assign it to null, and it will never be anything but null since you never assign any other value to it. Id=getResources().getIdentifier(str, "drawable", getPackageName()) I am not sure if str can be null (I would have to read your datamanager class I think, but for id: This leaves the id array and the str array. There are a couple of objects used on that line, but the system ones (the Resources and package name) can't be null. Line 41 looks like this: id=getResources().getIdentifier(str, "drawable", getPackageName()). The problem is on line 41 of the MainActivity class, in the getID() method. In your case, we can find out where using the stack trace: 11 moreĪs always, a NullPointerException is being thrown because you are using an variable which doesn't point to an object - it instead has a null value. I am using this tutorial for creating a custom listview from the database īut i modified the mainactivity such that the names and the image id's are retrieved from the database
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