In order to receive implicit intents, you must include the CATEGORY_DEFAULT category in the intent filter. The methods startActivity() and startActivityForResult() treat all intents as if they declared the CATEGORY_DEFAULT category. If you do not declare it in your intent filter, no implicit intents will resolve to your activity.
一般都是设置
其它Application中的Activity 调用 startActivity:
这个时候直接启动会失败,往往我们忘记在activity intent-filter中添加: