Android 的开发应该遵循以下原则
1>业务层代码（
Android Junit
）
2>先设计界面
3>设计
Activity
Android开发应该遵循
mvc
设计模式开发，所以我们先开发业务层代码，业务层是最复杂的一层，所以我们先要测试业务层，下面就以一个存储和读取文件的例子来说明测试的步骤
FileService
.java
public
class
FileService {
/**
* 写入文件
*
@param
out
*
@param
string
*
@throws
Exception
*/
public
static
void
write(OutputStream out, String string)
throws
Exception {
out.write(string.getBytes());
out.close();
}
/**
* 读取文件
*
@param
input
*
@return
*
@throws
Exception
*/
public
static
String read(InputStream input)
throws
Exception {
StringBuffer sb =
new
StringBuffer();
int
len = -1;
byte
[] buffer =
new
byte
[1024];
while
((len = input.read(buffer)) != -1) {
sb.append(
new
String(buffer, 0, len));
}
return
sb.toString();
}
}
测试方法，测试方法继承
AndroidTestCase
类，此类应该和
activity在同一包中
public
class
FileServiceTest
extends
AndroidTestCase
{
public
void
testWrite()
throws
Exception {
OutputStream outStream =
this
.
mContext
.openFileOutput(
"wangpeng.txt"
, Context.
MODE_PRIVATE
);
FileService.
write
(outStream,
"wp love xmm"
);
}
public
void
testRead()
throws
Exception {
InputStream input =
this
.
mContext
.openFileInput(
"wangpeng.txt"
);
String string = FileService.
read
(input);
System.
out
.println(
"---------->"
+ string);
}
}
在
AndroidTestCase
类中提供了一个
content的上下文的对象，这样就可以得到输入流和输出流
需要注意的是，需要在配置文件中加上
<
application
android:icon
=
"@drawable/icon"
android:label
=
"@string/app_name"
>
<
uses-library
android:name
=
"android.test.runner"
/>
<
activity
android:name
=
".FileActivity"
android:label
=
"@string/app_name"
>
<
intent-filter
>
<
action
android:name
=
"android.intent.action.MAIN"
/>
<
category
android:name
=
"android.intent.category.LAUNCHER"
/>
</
intent-filter
>
</
activity
>
</
application
>
<
instrumentation
android:name
=
"android.test.InstrumentationTestRunner"
android:targetPackage
=
"com.wp.file.activity"
android:label
=
"Tests for My App"
/>
这样就可以进行测试了