无法将 Java 类型转换为 Yail 类型

Question

我正在尝试为 AppInventor 构建一个扩展，但是当我执行 ant extensions 时，我得到了这个错误：

[javac] An annotation processor threw an uncaught exception.

[javac] Consult the following stack trace for details.

[javac] java.lang.RuntimeException: Cannot convert Java type 'android.content.Context' to Yail type

完整错误日志：

    [javac]
    [javac] An annotation processor threw an uncaught exception.
    [javac] Consult the following stack trace for details.
    [javac] java.lang.RuntimeException: Cannot convert Java type 'android.content.Context' to Yail type
    [javac]     at com.google.appinventor.components.scripts.ComponentProcessor.javaTypeToYailType(ComponentProcessor.ja
va:1184)
    [javac]     at com.google.appinventor.components.scripts.ComponentDescriptorGenerator.outputParameters(ComponentDesc
riptorGenerator.java:208)
    [javac]     at com.google.appinventor.components.scripts.ComponentDescriptorGenerator.outputBlockMethod(ComponentDes
criptorGenerator.java:187)
    [javac]     at com.google.appinventor.components.scripts.ComponentDescriptorGenerator.outputComponent(ComponentDescr
iptorGenerator.java:125)
    [javac]     at com.google.appinventor.components.scripts.ComponentDescriptorGenerator.outputResults(ComponentDescrip
torGenerator.java:226)
    [javac]     at com.google.appinventor.components.scripts.ComponentProcessor.process(ComponentProcessor.java:731)
    [javac]     at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.ja
va:794)
    [javac]     at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironm
ent.java:705)
    [javac]     at com.sun.tools.javac.processing.JavacProcessingEnvironment.access00(JavacProcessingEnvironment.java
:91)
    [javac]     at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1
035)
    [javac]     at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.jav
a:1176)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170)
    [javac]     at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:523)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:381)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:370)
    [javac]     at com.sun.tools.javac.main.Main.compile(Main.java:361)
    [javac]     at com.sun.tools.javac.Main.compile(Main.java:56)
    [javac]     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    [javac]     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.taskdefs.compilers.Javac13.execute(Javac13.java:58)
    [javac]     at org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1395)
    [javac]     at org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1121)
    [javac]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    [javac]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [javac]     at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]     at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
    [javac]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    [javac]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [javac]     at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]     at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:402)
    [javac]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    [javac]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [javac]     at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]     at org.apache.tools.ant.Target.execute(Target.java:435)
    [javac]     at org.apache.tools.ant.Target.performTasks(Target.java:456)
    [javac]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
    [javac]     at org.apache.tools.ant.helper.SingleCheckExecutor.executeTargets(SingleCheckExecutor.java:38)
    [javac]     at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
    [javac]     at org.apache.tools.ant.taskdefs.Ant.execute(Ant.java:441)
    [javac]     at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:293)
    [javac]     at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    [javac]     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    [javac]     at java.lang.reflect.Method.invoke(Method.java:498)
    [javac]     at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    [javac]     at org.apache.tools.ant.Task.perform(Task.java:348)
    [javac]     at org.apache.tools.ant.Target.execute(Target.java:435)
    [javac]     at org.apache.tools.ant.Target.performTasks(Target.java:456)
    [javac]     at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1405)
    [javac]     at org.apache.tools.ant.Project.executeTarget(Project.java:1376)
    [javac]     at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    [javac]     at org.apache.tools.ant.Project.executeTargets(Project.java:1260)
    [javac]     at org.apache.tools.ant.Main.runBuild(Main.java:857)
    [javac]     at org.apache.tools.ant.Main.startAnt(Main.java:236)
    [javac]     at org.apache.tools.ant.launch.Launcher.run(Launcher.java:287)
    [javac]     at org.apache.tools.ant.launch.Launcher.main(Launcher.java:113)

BUILD FAILED
D:\appinventor-sources\appinventor\build.xml:37: The following error occurred while executing this line:
D:\appinventor-sources\appinventor\components\build.xml:343: The following error occurred while executing this line:
D:\appinventor-sources\appinventor\components\build.xml:230: Compile failed; see the compiler error output for details.

可在此处找到导致此错误的文件：

https://github.com/barreeeiroo/appinventor-sources/blob/master/appinventor/components/src/com/google/appinventor/components/runtime/VersionName.java

我认为该行是： import android.content.Context; 第 24 行

当我构建扩展时，该文件没有错误，就像导入该库时出错一样，因为我尝试 import android.content.pm.Context 但它在读取文件时崩溃了，所以我想是 Javac 或 Java 错误

我该如何解决？

Answer 1

通常你会得到这样的上下文

public class TaifunTools extends AndroidNonvisibleComponent {
  private static Context context;
  private static final String LOG_TAG = "TaifunTools";

  public TaifunTools(ComponentContainer container) {    
    super(container.$form());
    this.container = container;
    context = (Context) container.$context();
  }

所以稍后您将使用此代码段来获取版本名称

  @SimpleFunction(description = "Returns the version name of the app")
  public String VersionName() {
    Log.d(LOG_TAG, "VersionName");
    try {
      PackageInfo pInfo = context.getPackageManager().getPackageInfo(context.getPackageName(), 0);
      String version = pInfo.versionName;
      return version;
    } catch (NameNotFoundException e) {
      Log.e(LOG_TAG, e.getMessage());
      e.printStackTrace();
      return "";
    }
  }

顺便说一句。有关使用 App Inventor 资源的问题，最好的地方是在 App Inventor Open Source forum...

中提问

另见 App Inventor Extensions document and look into the example extensions provided by MIT...

无法将 Java 类型转换为 Yail 类型

Cannot convert Java type to Yail type

java

ant

android

app-inventor