我是 maven 新手，正在尝试用它设置一个 android 项目。我使用maven-android-plugin完成了基本设置，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，在 pom.xml 中也提到过。Maven 尝试针对这两个版本进行编译。当添加一些代码以仅使用特定的 android 版本运行时，问题就开始了。我添加的代码是（我正在重用“有效显示位图” android培训文章中的这段代码）：
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。此代码即使在 android 2.2.1 上也运行良好，但 maven 构建失败并出现以下错误：
[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
有几点我不明白。
- 如果 maven 无法针对 android 2.2.1 lib 编译此代码，那么它在手机上运行时如何不会失败。（请注意，它甚至找不到 GINGERBREAD）。
- 如何解决这个问题？对不起，我有限的 Maven 知识。 3.