Hello I was doing a gallery, I created the Adapter, it worked normally, then proceed to the step of listing files in a directory and then put it in the list:
ArrayList<GalleryItem>items = new ArrayList<>();
File path = new File(getPath() + "//VideoPlayerPlus//");
File files[] = path.listFiles();
GalleryItem item[] = new GalleryItem[files.length];
for(int i = 0; i < files.length; i++){
item[i].setVideoTitle(files[i].getName());
items.add(i, item[i]);
}
lvItems.setAdapter(new GalleryAdapter(this, items));
I am able to list the files normally, the problem is the array of objects, when I start the application, the following error appears in the gallery activity:
01-18 11:14:41.461 25583-25583/com.samuelives.videoplayer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.samuelives.videoplayer, PID: 25583
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.samuelives.videoplayer/com.samuelives.videoplayer.Gallery}: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.samuelives.videoplayer.gallery.GalleryItem.setVideoTitle(java.lang.String)' on a null object reference
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3190)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300)
at android.app.ActivityThread.access$1000(ActivityThread.java:211)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
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:1404)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void com.samuelives.videoplayer.gallery.GalleryItem.setVideoTitle(java.lang.String)' on a null object reference
at com.samuelives.videoplayer.Gallery.onCreate(Gallery.java:62)
at android.app.Activity.performCreate(Activity.java:6575)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1134)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3143)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3300)
at android.app.ActivityThread.access$1000(ActivityThread.java:211)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1705)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:145)
at android.app.ActivityThread.main(ActivityThread.java:6946)
It indicates a null object when it has already been created, so how do you create an array of objects to add to an array list?