为什么一调用 Paint的 各种方法 就会崩溃？？？？？？？？？？？


10-04 05:58:26.253: I/Choreographer(4786): Skipped 44 frames!  The application may be doing too much work on its main thread.
10-04 05:58:26.323: D/gralloc_goldfish(4786): Emulator without GPU emulation detected.
10-04 05:58:26.354: D/AndroidRuntime(4786): Shutting down VM
10-04 05:58:26.354: W/dalvikvm(4786): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-04 05:58:26.394: E/AndroidRuntime(4786): FATAL EXCEPTION: main
10-04 05:58:26.394: E/AndroidRuntime(4786): java.lang.NullPointerException
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.graphics.Canvas.drawRect(Canvas.java:934)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at com.example.layout.MyView.onDraw(MyView.java:24)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13712)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13596)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13715)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.widget.FrameLayout.draw(FrameLayout.java:467)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13596)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13594)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.drawChild(ViewGroup.java:2928)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewGroup.dispatchDraw(ViewGroup.java:2797)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.View.draw(View.java:13715)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.widget.FrameLayout.draw(FrameLayout.java:467)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:2211)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl.drawSoftware(ViewRootImpl.java:2281)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl.draw(ViewRootImpl.java:2177)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2045)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1854)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:989)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4351)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.Choreographer.doCallbacks(Choreographer.java:562)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.Choreographer.doFrame(Choreographer.java:532)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.os.Handler.handleCallback(Handler.java:725)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.os.Handler.dispatchMessage(Handler.java:92)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.os.Looper.loop(Looper.java:137)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at android.app.ActivityThread.main(ActivityThread.java:5041)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at java.lang.reflect.Method.invokeNative(Native Method)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at java.lang.reflect.Method.invoke(Method.java:511)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-04 05:58:26.394: E/AndroidRuntime(4786):  at dalvik.system.NativeStart.main(Native Method)
10-04 05:58:51.554: E/Trace(4839): error opening trace file: No such file or directory (2)
10-04 05:58:52.344: I/Choreographer(4839): Skipped 41 frames!  The application may be doing too much work on its main thread.
10-04 05:58:52.394: D/gralloc_goldfish(4839): Emulator without GPU emulation detected.
10-04 06:00:41.623: E/Trace(4911): error opening trace file: No such file or directory (2)
10-04 06:00:41.873: D/AndroidRuntime(4911): Shutting down VM
10-04 06:00:41.873: W/dalvikvm(4911): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-04 06:00:41.924: E/AndroidRuntime(4911): FATAL EXCEPTION: main
10-04 06:00:41.924: E/AndroidRuntime(4911): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.layout/com.example.layout.MainActivity}: java.lang.NullPointerException
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.os.Looper.loop(Looper.java:137)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread.main(ActivityThread.java:5041)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at java.lang.reflect.Method.invokeNative(Native Method)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at java.lang.reflect.Method.invoke(Method.java:511)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at dalvik.system.NativeStart.main(Native Method)
10-04 06:00:41.924: E/AndroidRuntime(4911): Caused by: java.lang.NullPointerException
10-04 06:00:41.924: E/AndroidRuntime(4911):  at com.example.layout.MyView.<init>(MyView.java:15)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at com.example.layout.MainActivity.onCreate(MainActivity.java:13)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.Activity.performCreate(Activity.java:5104)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-04 06:00:41.924: E/AndroidRuntime(4911):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
10-04 06:00:41.924: E/AndroidRuntime(4911):  ... 11 more
10-04 06:00:44.264: I/Process(4911): Sending signal. PID: 4911 SIG: 9
10-04 06:04:51.103: D/AndroidRuntime(5021): Shutting down VM
10-04 06:04:51.124: W/dalvikvm(5021): threadid=1: thread exiting with uncaught exception (group=0x40a71930)
10-04 06:04:51.143: E/AndroidRuntime(5021): FATAL EXCEPTION: main
10-04 06:04:51.143: E/AndroidRuntime(5021): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.layout/com.example.layout.MainActivity}: java.lang.NullPointerException
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread.access$600(ActivityThread.java:141)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.os.Handler.dispatchMessage(Handler.java:99)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.os.Looper.loop(Looper.java:137)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread.main(ActivityThread.java:5041)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at java.lang.reflect.Method.invokeNative(Native Method)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at java.lang.reflect.Method.invoke(Method.java:511)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at dalvik.system.NativeStart.main(Native Method)
10-04 06:04:51.143: E/AndroidRuntime(5021): Caused by: java.lang.NullPointerException
10-04 06:04:51.143: E/AndroidRuntime(5021):  at com.example.layout.MyView.<init>(MyView.java:15)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at com.example.layout.MainActivity.onCreate(MainActivity.java:13)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.Activity.performCreate(Activity.java:5104)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
10-04 06:04:51.143: E/AndroidRuntime(5021):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
10-04 06:04:51.143: E/AndroidRuntime(5021):  ... 11 more