0

在我没有编译时错误，所以我尝试在模拟器螺母上运行我的代码，不幸的是我不知道如何跟踪 logcat，我在这里放置我的 logcat，任何人都可以帮助我找到问题

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
4

2 回答 2

1

您可能需要为您的MyPoint类提供一个不带参数的构造函数。

就像是

public MyPoint() {
    super();
}

发布您的整个代码，以便我们确认是这种情况。

于 2012-12-14T18:06:56.020 回答
0

您可以使用 MyPoint() 类对象，并且您不初始化该对象

于 2012-12-14T18:14:40.337 回答