Android Kotlin: “overrides nothing” error appears on instantiateItem() function of PagerAdapter

I just began learning Kotlin for work and one of the first errors I encountered is “overrides nothing” pointing at the overrides of the function instantiateItem() for my PagerAdapter The function/method signature was like this: override fun instantiateItem(parent: ViewGroup?, position: Int): Any { To fix the error, I simply removed the question mark from the […]

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Android: Facebook SDK “Invalid Key Hash” on Ubuntu

I kept getting a different Facebook key hash from the one being actually generated by my debug app when it runs. Turns out I’ve been entering the wrong keystore password. To get your key hash for Facebook SDK on Ubuntu, run the following command:

In case you don’t have the keytool program yet, you’ll […]

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Android: SharedPreferences not accessible from SyncAdapter

When I was trying to access a SharedPreferences value from my Android app’s SyncAdapter, I kept on receiving an old value that was saved to the key. Quick solution to inaccessible SharedPreferences from SyncAdapter A quick solution (which may be a short-term one) I tried was to remove android:process=”:sync” from the following code:

But […]

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Android app dev: Missing import org.apache.commons.lang3.text.WordUtils;

I use a few instances of WordUtils.capitalizeFully() on an Android app that I’ve been working on. And there are times when the import org.apache.commons.lang3.text.WordUtils; breaks, sometimes after merging with some of my git branches. To fix this, what I do is open app/build.gradle and add the following line under dependencies:

Hope this saves somebody […]

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Android RecyclerView notifyItemChanged() IllegalStateException “Cannot call this method while RecyclerView is computing a layout or scrolling”

If your Android app is crashing with error IllegalStateException “Cannot call this method while RecyclerView is computing a layout or scrolling”, you may try placing your notifyitemchanged inside a Runnable. Assuming you have a call to notifyItemChanged() inside onBindViewHolder() that is making your app crash with IllegalStateException, you may try something like this:

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Android app development: click a ListView item programmatically

I’m going to share a code snippet that you may use to programmatically click a ListView item in your Android app. This will not simply highlight the desired ListView item, but also trigger the onItemClick listener. This code is what I placed in a Fragment’s onLoadFinished() method:

Simply replace the default_position value with the […]

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