android - java.lang.InstantiationException: class com.example.camera.MainActivity has no zero argument constructor

Question

03-02 12:03:23.564: D/AndroidRuntime(9302): Shutting down VM
03-02 12:03:23.570: E/AndroidRuntime(9302): FATAL EXCEPTION: main
03-02 12:03:23.570: E/AndroidRuntime(9302): Process: com.example.camera, PID: 9302
03-02 12:03:23.570: E/AndroidRuntime(9302): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.camera/com.example.camera.MainActivity}: java.lang.InstantiationException: class com.example.camera.MainActivity has no zero argument constructor
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2225)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2388)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread.access$800(ActivityThread.java:148)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.os.Handler.dispatchMessage(Handler.java:102)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.os.Looper.loop(Looper.java:135)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread.main(ActivityThread.java:5312)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.reflect.Method.invoke(Native Method)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.reflect.Method.invoke(Method.java:372)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
03-02 12:03:23.570: E/AndroidRuntime(9302): Caused by: java.lang.InstantiationException: class com.example.camera.MainActivity has no zero argument constructor
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.Class.newInstance(Class.java:1563)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.Instrumentation.newActivity(Instrumentation.java:1088)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2215)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	... 10 more
03-02 12:03:23.570: E/AndroidRuntime(9302): Caused by: java.lang.NoSuchMethodException: <init> []
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.Class.getConstructor(Class.java:531)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.Class.getDeclaredConstructor(Class.java:510)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	at java.lang.Class.newInstance(Class.java:1561)
03-02 12:03:23.570: E/AndroidRuntime(9302): 	... 12 more

Answer 1

Get rid of your MainActivity(Context context, Camera camera) constructor. No code will ever use it. Move its code somewhere else.

Then, get rid of your MainActivity() constructor, and just inherit the superclass' constructor.