Implicit Intent - java.lang.NullPointerException: Attempt to invoke virtual method on a null object reference

Question

java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference

I am getting this error when I am trying to open a link with implicit intent. I am calling openUrl(url: String) in Settings.kt activity from it's adapter class SettingsAdapter.kt through a setOnClcikListener on a ImageView.

SettingsAdapter.kt Class

private val settings = Settings()
youtubeLink.setOnClickListener {
            val url = "https://www.youtube.com/watch?v=i-0FtaAadeM"
            settings.openUrl(url)
        }

Settings.kt Activity

fun openUrl(url: String) {
        val intent = Intent(Intent.ACTION_VIEW,Uri.parse(url))
        startActivity(intent)
    }

What are you doing exactly? Creating a class object and calling its function? — Priyanka, Oct 28 '20 at 05:38
Yes. I've created an object of Settings.kt activity in it's adapter class — Levi, Oct 28 '20 at 05:46
You should never create an object of Activity yourself . OS handles it for you . Please read about `Activity` first . — ADM, Oct 28 '20 at 05:54

Priyanka · Accepted Answer · 2020-10-28T05:57:16.530

You are following wrong approach. You can do this in two ways.

You can directly call code snippet in your adapter

  youtubeLink.setOnClickListener {
     val url = "https://www.youtube.com/watch?v=i-0FtaAadeM"
     val intent = Intent(Intent.ACTION_VIEW,Uri.parse(url))
     context.startActivity(intent)
 }

You can create a callback in your adapter and implement in your activity

 private OnSettingsListener listener;

void setOnSttingListener(OnSettingsListener listener){
  this.listener = listener;
}

youtubeLink.setOnClickListener {
     val url = "https://www.youtube.com/watch?v=i-0FtaAadeM"
     listener.onSettingClick(url);
 }

interface OnSettingsListener {  
  void onSettingClick(String url);     
}

In your activity, implement this listener

 Settings implements SettingsAdapter.OnSettingsListener {

 @Override
 public void onSettingClick(String url) {
  openUrl(url)
}
}

Yeah. I got it now, I was following the first approach before but I haven't wrapped the startActivity() with context so I was getting an error — Levi, Oct 28 '20 at 06:21

Implicit Intent - java.lang.NullPointerException: Attempt to invoke virtual method on a null object reference

1 Answers1