Android应用开发笔记

1. A service runs in the main thread of its hosting process—the service does not create its own thread and does not run in a separate process (unless you specify otherwise)

service虽然没有UI，也不可以做耗时操作，否则依旧有ActivityManager报ANR，即使将service设置到另外一个process中也不行，虽然当前process的UI不会阻塞了，可是后台打印log发现，另一个process里的service在大约30s后ANR了。。而且没有ANR的提示框弹出。。。

2.startActivity

<activity
            android:name="com.example.call.MyActivity"
            android:label="@string/app_name2" >
            <intent-filter >
                <action android:name="ritter.com"/>
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

当使用隐式调用activity时，一定要在intent-filter里指定category DEFAULT，因为默认的Intent会创建category DEFAULT。

Android treats all implicit intents passed to startActivity() as if they contained at least one category: "android.intent.category.DEFAULT" (the CATEGORY_DEFAULT constant). Therefore, activities that are willing to receive implicit intents must include "android.intent.category.DEFAULT" in their intent filters