技术咨询：能否使用com.android.internal.Itelephony接口及包内方法？

Hey there! Let's break down your questions about this Android internal telephony interface clearly and practically:

Can you call methods from com.android.internal.ITelephony? #

Short answer: It's not recommended, and extremely restricted for regular third-party apps. Here's the full picture:

• This is an internal system-only interface — it’s not part of the public Android SDK. That means no official IDE support, no stability guarantees across Android versions, and Google can change its methods or access rules at any time.
• To even attempt calling its methods, you’d have to use reflection to bypass SDK restrictions. A rough example snippet might look like this:

  try {
      TelephonyManager tm = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
      Method getITelephonyMethod = tm.getClass().getDeclaredMethod("getITelephony");
      getITelephonyMethod.setAccessible(true);
      Object iTelephonyInstance = getITelephonyMethod.invoke(tm);
      // Call a method like endCall() via reflection
      Method endCallMethod = iTelephonyInstance.getClass().getDeclaredMethod("endCall");
      endCallMethod.invoke(iTelephonyInstance);
  } catch (Exception e) {
      e.printStackTrace();
  }
  

• Even with reflection, most methods require system-level permissions (like MODIFY_PHONE_STATE) that regular apps can’t obtain. Google reserves these permissions for pre-installed system apps only.
• Starting from Android 10 (API 29), telephony access is further locked down, so many reflection tricks for this interface no longer work.

Can you implement com.android.internal.ITelephony and use its methods? #

Technically possible, but practically useless for most developers:

• The interface is defined via AIDL. You could create a matching AIDL file in your project and write a class that implements all its methods.
• However, the real functionality of this interface relies on direct access to Android’s underlying telephony hardware and system services. Your custom implementation won’t have access to these resources unless your app is a privileged system app (signed with the device’s system certificate and installed in the system partition).
• There’s no way to hook your implementation into the system’s actual telephony service unless you’re building a custom ROM or modifying the Android framework itself — which is way outside the scope of regular app development.

Key Takeaways #

• Steer clear of com.android.internal.ITelephony in production third-party apps. It’s unstable, will get your app rejected from Google Play, and will break across different Android versions.
• For telephony-related tasks, stick to public, supported APIs like TelephonyManager or CallManager — these are documented, maintained, and safe for regular app use.

内容的提问来源于stack exchange，提问作者Youssef Dahmane Jdid