区别
| 功能 | mean | Application | Activity | Service |
|---|---|---|---|---|
| 对话框 | show a dialog | no | yes | no |
| 启动activity | start an activity | no | yes | no |
| 实例化布局 | layout inflate | no | yes | no |
| 启动服务 | start a service | yes | yes | yes |
| 绑定服务 | bind to a service | yes | yes | yes |
| 发送广播 | send a broadcast | yes | yes | yes |
| 注册广播接收器 | registe broadcastreceiver | yes | yes | yes |
| 加载资源文件 | load resource values | yes | yes | yes |
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