Android 我正试图创建一个简单的生活墙纸绘制路径，但它不适合我

试试这个

在inside touch_start方法中，m_路径为空。请尝试如下初始化它并使用它

06-06 09:35:34.613: I/dalvikvm(8774): Turning on JNI app bug workarounds for target SDK version 10...
06-06 09:35:34.636: E/Trace(8774): error opening trace file: No such file or directory (2)
06-06 09:35:39.730: D/AndroidRuntime(8774): Shutting down VM
06-06 09:35:39.730: W/dalvikvm(8774): threadid=1: thread exiting with uncaught exception (group=0x40f172a0)
06-06 09:35:39.730: E/AndroidRuntime(8774): FATAL EXCEPTION: main
06-06 09:35:39.730: E/AndroidRuntime(8774): java.lang.NullPointerException
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.sabeel.livewallpaper.MyWallpaperService$MyWallpaperEngine.touch_start(MyWallpaperService.java:159)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.sabeel.livewallpaper.MyWallpaperService$MyWallpaperEngine.onTouchEvent(MyWallpaperService.java:101)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:1102)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.os.Looper.loop(Looper.java:137)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.app.ActivityThread.main(ActivityThread.java:5059)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at java.lang.reflect.Method.invokeNative(Native Method)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at java.lang.reflect.Method.invoke(Method.java:511)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at dalvik.system.NativeStart.main(Native Method)

06-06 09:35:34.613: I/dalvikvm(8774): Turning on JNI app bug workarounds for target SDK version 10...
06-06 09:35:34.636: E/Trace(8774): error opening trace file: No such file or directory (2)
06-06 09:35:39.730: D/AndroidRuntime(8774): Shutting down VM
06-06 09:35:39.730: W/dalvikvm(8774): threadid=1: thread exiting with uncaught exception (group=0x40f172a0)
06-06 09:35:39.730: E/AndroidRuntime(8774): FATAL EXCEPTION: main
06-06 09:35:39.730: E/AndroidRuntime(8774): java.lang.NullPointerException
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.sabeel.livewallpaper.MyWallpaperService$MyWallpaperEngine.touch_start(MyWallpaperService.java:159)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.sabeel.livewallpaper.MyWallpaperService$MyWallpaperEngine.onTouchEvent(MyWallpaperService.java:101)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:1102)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.os.Handler.dispatchMessage(Handler.java:99)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.os.Looper.loop(Looper.java:137)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at android.app.ActivityThread.main(ActivityThread.java:5059)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at java.lang.reflect.Method.invokeNative(Native Method)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at java.lang.reflect.Method.invoke(Method.java:511)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:792)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:555)
06-06 09:35:39.730: E/AndroidRuntime(8774):     at dalvik.system.NativeStart.main(Native Method)

m_Path = new Path();