小白说我是2B

摘要： 每个Activity ,在AndroidManifest.xml中都必须有描述，这样才能使用 startActivity(); To be of use with Context.startActivity(), all activity classes must have a corresponding declaration in their package's AndroidManifest.xml. 阅读全文

摘要： 作用： 1.start an activity 2.start a service 3.deliver a broadcast 有2种类型的Intents 1.explicit 显示 ：明确指定要启动哪个activity 2.implicit 隐式 ：并不指明启动哪个activity或application，the Android system finds the appropriate component to start by comparing the contents of the intent to ... 阅读全文