不幸的是應用程序已經停止在發射活牆紙

Question

在我沒有編譯時錯誤，所以我試圖運行我的代碼模擬器堅果它不幸停下來我不知道如何遵循logcat，在這裏我把我的logcat任何人幫助我在尋找問題

12-14 23:02:20.816: D/dalvikvm(845): Not late-enabling CheckJNI (already on) 
12-14 23:02:21.516: D/dalvikvm(845): newInstance failed: no <init>() 
12-14 23:02:21.556: D/AndroidRuntime(845): Shutting down VM 
12-14 23:02:21.556: W/dalvikvm(845): threadid=1: thread exiting with uncaught exception (group=0x409961f8) 
12-14 23:02:21.666: E/AndroidRuntime(845): FATAL EXCEPTION: main 
12-14 23:02:21.666: E/AndroidRuntime(845): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sri.alinwallpaper/com.sri.alinwallpaper.MyPoint}: java.lang.InstantiationException: can't instantiate class com.sri.alinwallpaper.MyPoint; no empty constructor 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1879) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1980) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread.access$600(ActivityThread.java:122) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1146) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.os.Handler.dispatchMessage(Handler.java:99) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.os.Looper.loop(Looper.java:137) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread.main(ActivityThread.java:4340) 
12-14 23:02:21.666: E/AndroidRuntime(845): at java.lang.reflect.Method.invokeNative(Native Method) 
12-14 23:02:21.666: E/AndroidRuntime(845): at java.lang.reflect.Method.invoke(Method.java:511) 
12-14 23:02:21.666: E/AndroidRuntime(845): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
12-14 23:02:21.666: E/AndroidRuntime(845): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
12-14 23:02:21.666: E/AndroidRuntime(845): at dalvik.system.NativeStart.main(Native Method) 
12-14 23:02:21.666: E/AndroidRuntime(845): Caused by: java.lang.InstantiationException: can't instantiate class com.sri.alinwallpaper.MyPoint; no empty constructor 
12-14 23:02:21.666: E/AndroidRuntime(845): at java.lang.Class.newInstanceImpl(Native Method) 
12-14 23:02:21.666: E/AndroidRuntime(845): at java.lang.Class.newInstance(Class.java:1319) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.Instrumentation.newActivity(Instrumentation.java:1023) 
12-14 23:02:21.666: E/AndroidRuntime(845): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1870) 
12-14 23:02:21.666: E/AndroidRuntime(845): ... 11 more 
12-14 23:02:25.496: I/Process(845): Sending signal. PID: 845 SIG: 9 

Answer 1

這可能是因爲你需要提供一個構造函數沒有參數爲您MyPoint類。

喜歡的東西

public MyPoint() { 
    super(); 
} 

發表你的整個代碼，所以我們可以確認是這種情況。

Answer 2

您可以使用MyPoint（）類對象，並且不會初始化該對象