Android开发遇到的小问题之小解；
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eclipse里console里提示The launch will only sync the application package on the device
经查找是AndroidManifest.xml里的主activity里红色部分没加，，
<activity
android:label="@string/XXX"
android:name=".XXX">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
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Unreachable code 错误
不可达代码，比如在循环的break或者return后面的代码就是不可达代码，因为执行它们之前就已经跳出循环了，只要把这段代码移到break或者return之前就好了
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Problem：The nested type HelloWorld cannot hide an enclosing type
回答：You have defined the HelloWorld class twice. Remove one level and you should be fine.
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class ButtonListener implements OnClickListener
如果按照上面写就会报错了，改成如下形式才行
class ButtonListener extends Activity implements Button.OnClickListener
报错提示：
The type ProgressHandle.ButtonListener must implement the inherited abstract method DialogInterface.OnClickListener.onClick(DialogInterface, int)
结论：使用快捷键时导包导错了，应该导入android.view.View.OnClickListener包，而不是android.content.DialogInterface.OnClickListener包。
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未完待续...