Note:This question is not about how to fix a NullPointerException. This question is about why a piece of code that has been updated still generates a stacktrace in the Android Studio application for an older version.
I have a class that checks internet connectivity. This class, however, used to have an invalid piece of code, like this:
public class InternetConnectivityChecker {
private Context context;
public InternetConnectivityChecker(Context context) {
context = context;
}
I fixed this piece of code by changing it to:
public class InternetConnectivityChecker {
private Context context;
public InternetConnectivityChecker(Context context) {
this.context = context;
}
I kept getting a stacktrace, pasted below. To fix that, I decided to remove the invokation of the class altogether.
This class used to be called from SamaWebViewClient, on line 22. However, now it is not being called anymore:
public class SamaWebViewClient extends WebViewClient {
private com.sama7.sama.listeners.OnReceivedErrorListener onReceivedErrorListener;
public SamaWebViewClient(com.sama7.sama.listeners.OnReceivedErrorListener listener) {
this.onReceivedErrorListener = listener;
}
@Override
public void onReceivedError(WebView view, int errorCode, String description, String failingUrl) {
onReceivedErrorListener.onReceivedError();
}
}
However, now when I run my code in debug mode, even though I get 0 errors and 0 warnings in the Gradle Build window, this is what I see in logcat:
03-02 08:49:29.240 24373-24373/com.sama7.sama E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.sama7.sama, PID: 24373
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object android.content.Context.getSystemService(java.lang.String)' on a null object reference
at com.sama7.sama.InternetConnectivityChecker.isConnected(InternetConnectivityChecker.java:15)
at com.sama7.sama.SamaWebViewClient.onReceivedError(SamaWebViewClient.java:22)
at com.android.webview.chromium.WebViewContentsClientAdapter.onReceivedError(WebViewContentsClientAdapter.java:582)
at org.chromium.android_webview.AwContentsClient.onReceivedError(AwContentsClient.java:355)
at org.chromium.android_webview.AwContentsClientCallbackHelper$MyHandler.handleMessage(AwContentsClientCallbackHelper.java:160)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:5832)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1399)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1194)
03-02 08:49:38.015 24373-24373/com.sama7.sama I/Process: Sending signal. PID: 24373 SIG: 9
Why am I not getting the latest application built and deployed to my Samsung Galaxy S5 device?
