我是Maven的新手,正在尝试使用它来设置Android项目。我已经完成了基本的设置,使用maven-android-plugin,并且能够成功构建我的项目。我已将min-sdk版本添加到我的项目pom中:
<dependency>
<groupId>com.google.android</groupId>
<artifactId>android</artifactId>
<version>2.2.1</version>
</dependency>
我的目标SDK版本是4.2,这也在pom中提到。Maven试图同时编译两个版本。问题出现在我添加了一些只能在特定Android版本上运行的代码时。我添加的代码是(我从"有效地显示位图" Android培训文章中重用了此代码):
public class Utils {
private Utils() {};
@TargetApi(11)
public static void enableStrictMode() {
if (Utils.hasGingerbread()) {
StrictMode.ThreadPolicy.Builder threadPolicyBuilder =
new StrictMode.ThreadPolicy.Builder()
.detectAll()
.penaltyLog();
StrictMode.VmPolicy.Builder vmPolicyBuilder =
new StrictMode.VmPolicy.Builder()
.detectAll()
.penaltyLog();
if (Utils.hasHoneycomb()) {
threadPolicyBuilder.penaltyFlashScreen();
vmPolicyBuilder
.setClassInstanceLimit(ImageGridActivity.class, 1)
.setClassInstanceLimit(ImageDetailActivity.class, 1);
}
StrictMode.setThreadPolicy(threadPolicyBuilder.build());
StrictMode.setVmPolicy(vmPolicyBuilder.build());
}
}
public static boolean hasFroyo() {
// Can use static final constants like FROYO, declared in later versions
// of the OS since they are inlined at compile time. This is guaranteed behavior.
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.FROYO;
}
public static boolean hasGingerbread() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD;
}
public static boolean hasHoneycomb() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB;
}
public static boolean hasHoneycombMR1() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB_MR1;
}
public static boolean hasJellyBean() {
return Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN;
}
}
现在问题开始了。这段代码即使在Android 2.2.1上也可以正常运行,但Maven构建会出现以下错误:
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.5.1:compile (default-compile) on project laminar-app: Compilation failure: Compilation failure:
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[24,17] error: cannot find symbol
[ERROR] symbol: class StrictMode
[ERROR] location: package android.os
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[35,35] error: package StrictMode.ThreadPolicy does not exist
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[36,47] error: package StrictMode.ThreadPolicy does not exist
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[39,31] error: package StrictMode.VmPolicy does not exist
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[40,43] error: package StrictMode.VmPolicy does not exist
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[55,12] error: cannot find symbol
[ERROR] symbol: variable StrictMode
[ERROR] location: class Utils
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[56,12] error: cannot find symbol
[ERROR] symbol: variable StrictMode
[ERROR] location: class Utils
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[61,59] error: cannot find symbol
[ERROR] symbol: variable GINGERBREAD
[ERROR] location: class VERSION_CODES
[ERROR] /Users/shashant/Documents/workspace/Android/laminar-parent/laminar-app/src/main/com/laminar/utils/Utils.java:[65,59] error: cannot find symbol
我有几个不理解的问题。
- 如果Maven在Android 2.2.1库上编译此代码失败,那么为什么在手机运行时没有失败呢?(请注意,它甚至找不到GINGERBREAD)。
- 如何解决这个问题?对于我有限的Maven知识,很抱歉。
StrictMode
,则需要针对具有该功能的Android版本进行编译,即>= 2.3。 - Christopher Orr