为什么我的程序加了 Intent startMain = new Intent(Intent.ACTION_MAIN);
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
System.exit(0);//退出程序再次启动时会报错
01-04 18:03:40.564: WARN/dalvikvm(4704): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): FATAL EXCEPTION: main
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.saqdocument/com.android.dispaly.OpenPicture}: java.lang.NullPointerException
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2787)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2803)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.access$2300(ActivityThread.java:135)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.os.Handler.dispatchMessage(Handler.java:99)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.os.Looper.loop(Looper.java:144)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.main(ActivityThread.java:4937)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at java.lang.reflect.Method.invokeNative(Native Method)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at java.lang.reflect.Method.invoke(Method.java:521)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at dalvik.system.NativeStart.main(Native Method)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): Caused by: java.lang.NullPointerException
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.dispaly.OpenPicture.onCreate(OpenPicture.java:162)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1069)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2751)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): ... 11 more
01-04 18:03:40.574: WARN/ActivityManager(103): Force finishing activity com.android.saqdocument/com.android.dispaly.OpenPicture
startMain.addCategory(Intent.CATEGORY_HOME);
startMain.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
startActivity(startMain);
System.exit(0);//退出程序再次启动时会报错
01-04 18:03:40.564: WARN/dalvikvm(4704): threadid=1: thread exiting with uncaught exception (group=0x400259f8)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): FATAL EXCEPTION: main
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.android.saqdocument/com.android.dispaly.OpenPicture}: java.lang.NullPointerException
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2787)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2803)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.access$2300(ActivityThread.java:135)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2136)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.os.Handler.dispatchMessage(Handler.java:99)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.os.Looper.loop(Looper.java:144)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.main(ActivityThread.java:4937)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at java.lang.reflect.Method.invokeNative(Native Method)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at java.lang.reflect.Method.invoke(Method.java:521)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at dalvik.system.NativeStart.main(Native Method)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): Caused by: java.lang.NullPointerException
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at com.android.dispaly.OpenPicture.onCreate(OpenPicture.java:162)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1069)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2751)
01-04 18:03:40.574: ERROR/AndroidRuntime(4704): ... 11 more
01-04 18:03:40.574: WARN/ActivityManager(103): Force finishing activity com.android.saqdocument/com.android.dispaly.OpenPicture
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01-04 18:08:20.464: ERROR/AndroidRuntime(4747): at com.android.dispaly.OpenPicture.onCreate(OpenPicture.java:162)
出现的是cursor = LOGE.DB.query(MyHelper.TB_NAME,
new String[] {MyHelper.PATH,},
MyHelper.ID + " = ?", new String[] {mack+""},null, null, null);