[Coursera] Programming Mobile Applications for Android Handheld Systems (Week 3)

课程汇总贴：
http://www.1point3acres.com/bbs/forum.php?mod=viewthread&tid=82091

截图内容：
请大家将每周的quiz和lab截图，会有版主为大家加1学分（50大米）。

Week 3 内容：

Intents.
Last week we saw how Android applications are often designed as chains of Activities, one Activity starts another, and so on. To start an Activity we used Intents. This week we'll talk more about Intents and how Android uses them.

Permissions.
Activities use Intents to start other Activities. But is that always a good thing? Should just any app be allowed to read your contacts list? Or to delete files on your SD card? Sometimes, we need to control when and by whom an Activity is started. Android does this through its Permissions architecture. This week we'll look at how Permissions and created and enforced.

The Fragment Class.
Fragments represent a piece of an Activity's user interface. We'll talk about the Fragment class and what it can do. We'll also talk about the Fragment lifecycle and how it interacts with the Activity lifecycle.


Week 3 需上传：


Quiz.
We have a weekly quiz.

Labs.
This week we have three Labs, one for each lecture topic. Make sure you read the Lab writeups very carefully. I suggest you implement them in the following order.
In the Intents Lab you will develop a simple application that uses both explicit and implicit Intents to starts other Activities and, in some cases, to receive data from them.
In the Permissions Lab you will develop two simple applications that together both use and define permissions.
In the Fragments Lab you will develop a single application that uses Fragments to create different layouts depending on the screen size of the device.

这门课貌似没多少人刷呀。继续努力，求加学分

继续努力，求加学分。。

WEEK 3 搞定！

Week 3

1. <application
   
2.         android:allowBackup="true"
   
3.         android:icon="@drawable/ic_launcher"
   
4.         android:label="@string/app_name"
   
5.         android:theme="@style/AppTheme"
   
6.         android:permission="course.labs.permissions.DANGEROUS_ACTIVITY_PERM" >
   
7. 
   
8.         <!-- TODO - enforce the custom permission on this Activity -->

复制代码

I don't understand it~ the DangerousAPP just defined a permission, and the PermissionLab should use the <uses-permission> to get the permission, why should add this line(android:permission="course.labs.permissions.DANGEROUS_ACTIVITY_PERM") here?

sanguine 发表于 2014-2-13 10:30
I don't understand it~ the DangerousAPP just defined a permission, and the PermissionLab should use  ...

我理解是<permission>只是声明了有这么一个permission，加入的这行代码才代表这个应用程序需要用到这个permission。

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