android 编译没错但是不能运行

[2012-12-26 14:41:33 - Sudoku] ------------------------------
[2012-12-26 14:41:33 - Sudoku] Android Launch!
[2012-12-26 14:41:33 - Sudoku] adb is running normally.
[2012-12-26 14:41:33 - Sudoku] Performing com.example.sudoku.Main activity launch
[2012-12-26 14:41:33 - Sudoku] Automatic Target Mode: Preferred AVD 'avd1.5' is available on emulator 'emulator-5554'
[2012-12-26 14:41:33 - Sudoku] WARNING: Application does not specify an API level requirement!
[2012-12-26 14:41:33 - Sudoku] Device API version is 3 (Android 1.5)
[2012-12-26 14:41:34 - Sudoku] Application already deployed. No need to reinstall.
[2012-12-26 14:41:34 - Sudoku] Starting activity com.example.sudoku.Main on device emulator-5554
[2012-12-26 14:41:35 - Sudoku] ActivityManager: Can't dispatch DDM chunk 46454154: no handler defined
[2012-12-26 14:41:35 - Sudoku] ActivityManager: Can't dispatch DDM chunk 4d505251: no handler defined
[2012-12-26 14:41:35 - Sudoku] ActivityManager: Starting: Intent { action=android.intent.action.MAIN categories={android.intent.category.LAUNCHER} comp={com.example.sudoku/com.example.sudoku.Main} }
[2012-12-26 14:41:35 - Sudoku] ActivityManager: Warning: Activity not started, its current task has been brought to the front

activity不能启动，很可能是你在系统配置文件中没有声明这个activity

有些是这样的，你可以进入problems，console，logcat，查看提示什么错，一般的错误都可以在这3个窗口中找到。