Question

我是maven的新手，正在尝试用它设置一个android项目。我完成了使用maven-android-plugin的基本设置，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，也在pom中提到。 Maven尝试针对这两个版本编译它。问题开始时添加一些代码只能运行特定的android版本。我添加的代码是（我正在重用"Displaying Bitmap Effectively" android培训文章中的代码）：

    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。即使在Android 2.2.1上，此代码运行正常，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在针对android 2.2.1 lib编译此代码时失败，那么它是如何在运行时在电话上失败的呢？（注意它甚至找不到GINGERBREAD）。
如何解决这个问题？对不起，我有限的专业知识。

Answer 1

您需要针对Android 2.3或更高版本编译应用以获取StrictMode。

您必须在IDE中针对更高版本的操作系统版本编译应用程序在Maven配置中使用相同的版本。

Maven和Android向后兼容性（android.os.StrictMode）

1 个答案: