我正在为Unity3D开发一个Android库，我在检查音频权限时遇到了问题。起初我使用ContextCompat. checkSelfPersion（），但失败了：问题是：

10-16 13:46:39.466 856-939/? E/Unity: AndroidJavaException: java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/content/ContextCompat;
                                          java.lang.NoClassDefFoundError: Failed resolution of: Landroid/support/v4/content/ContextCompat;
                                              at com.magikid.unityplugin.RecordManager.isGotRecordPermission(RecordManager.java:431)
                                              at com.magikid.unityplugin.RecordManager.RequestRecordPermission(RecordManager.java:370)
                                              at com.unity3d.player.UnityPlayer.nativeRender(Native Method)
                                              at com.unity3d.player.UnityPlayer.c(Unknown Source)
                                              at com.unity3d.player.UnityPlayer$c$1.handleMessage(Unknown Source)
                                              at android.os.Handler.dispatchMessage(Handler.java:107)
                                              at android.os.Looper.loop(Looper.java:194)
                                              at com.unity3d.player.UnityPlayer$c.run(Unknown Source)
                                           Caused by: java.lang.ClassNotFoundException: Didn't find class "android.support.v4.content.ContextCompat" on path: DexPathList[[zip file "/data/app/com.magikid.channel-1/base.apk"],nativeLibraryDirectories=[/data/app/com.magikid.channel-1/lib/arm, /vendor/lib, /system/lib]] at dalvik."

更新API后，android.support. v4.content.ContextCompat的使用令人困惑，添加android-portport-v4后。jar，问题得到了解决。我可以使用ContextCompat.checkSelfPersion或PermissionChecker.checkCallingOrSelfPersion或PermissionChecker.checkSelfPersion，没有其他错误存在，但它的值总是返回PERMISSION_GRANTED。然后我尝试使用PermissionChecker.checkSelfPersion（）而不是在Cannot解析方法"SelcheckfPersion"中添加android-support port-v4。jar，似乎一切都好：我得到了PERMISSION_GRANTED的检查结果，然而在那之后，当我试图拒绝权限时，检查仍然返回PERMISSION_GRANTED。顺便说一句，我区分了不同的APIlvl，以下是我的代码：

public class AppUtils 
{
  private static Application application;

  public static void setApplication(Application application) 
  {
    try 
    {
      if (AppUtils.application == null) 
      {
        AppUtils.application = application;
      } 
      else 
      {
        throw new IllegalStateException("Application already holded 'application'.");
      }
    } 
    catch (Exception e) 
    {
      Log.e("UnityDebugSetApp", String.valueOf(e));
    }
  }
}
public class RecordManager
{
  public static Context getContext() 
  {
    return application.getApplicationContext();
  }

  //This method is to judge if user allows permission
  public static boolean isGotRecordPermission()
  {
    Activity activity = UnityPlayer.currentActivity;
    String permissionName = "android.permission.RECORD_AUDIO";
    String pkgName = activity.getPackageName();
    if (Build.VERSION.SDK_INT  >= 23) 
    {
      return PackageManager.PERMISSION_GRANTED == getAppContext().checkCallingOrSelfPermission (permissionName);
    } 
    else 
    {
      return PermissionChecker.PERMISSION_GRANTED == PermissionChecker.checkCallingOrSelfPermission (getAppContext(), permName);
    }
  }
}

这是我的build. gradle：

apply plugin: 'com.android.library'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.0"

    defaultConfig {
        minSdkVersion 21
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

        ndk {
            abiFilters  "armeabi-v7a", "armeabi"
        }
    }

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    sourceSets {
        main {
            jniLibs.srcDirs = ['src/main/jniLibs']
        }
    }
}

dependencies {
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.3.1'
    testCompile 'junit:junit:4.12'
    provided files('libs/classes.jar')
    compile files('libs/wechat-sdk.jar')
    compile files('libs/flame.jar')
    compile files('libs/android-support-v4.jar')
}

如果我的问题不清楚或者你需要更多的细节，请评论让我知道，我会尽力帮助你帮助我，非常感谢！