无法返回当前的键盘语言

Question

在app / build.gradle中：

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    compileSdkVersion 26
    flavorDimensions "default"
    defaultConfig {
        applicationId "com.myapp"
        minSdkVersion 17
        targetSdkVersion 26
        versionCode 78
        versionName "3.36"

在软键盘上单击更改语言的按钮时，我想检测当前键盘的语言：

在片段中，我尝试获取当前的键盘语言，如下所示：

  @Override
                public void afterTextChanged(Editable editable) {
                    if (editable.length() == 1) {
                        System.out.println("Locale.getDefault().getLanguage()  = " + RTLUtils.getCurrentInputLanguageLocale(getActivity()));
                    }
                }


 public static String getCurrentInputLanguageLocale(Context context) {
        InputMethodManager imm = (InputMethodManager) context.getSystemService(Context.INPUT_METHOD_SERVICE);
        InputMethodSubtype ims = imm.getCurrentInputMethodSubtype();
        String locale = ims.getLocale();
        return locale;
    }

但总是返回空的语言环境