How to Handle Compatibility of Android High Version API Method on Low Version System

Preface

In the recent development, we need to obtain the network status of SIM card, and see 1 method in the source code:

TelephonyManager tm =(TelephonyManager)context.getSystemService(TELEPHONY_SERVICE);
state =tm.getDataNetworkType();

But there was an error Call requires API level 24 (current min is 21): android.telephony.TelephonyManager#getDataNetworkType

Android version changes, the new version brings new features, new methods.

The new method brings a lot of convenience, but it can't run on a lower version system. If the compatibility is not handled properly, APP will run on a lower version system and crash will run.

Treatment method

Step 1 Add @RequiresApi(api = Build.VERSION_CODES.N)

Step 2 Add @TargetApi(Build.VERSION_CODES.N)

Step 3 Add @SuppressLint("NewApi")

4. Add runtime SDK version judgment

  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
   tm.getDataNetworkType();
  }

5. Implement this functionality in a lower version by other means

Summarize

Methods 1. 2. 3 just compile through, and when a system below API24 runs, it will throw java.lang.NoSuchMethodError .

The correct way is to add a runtime SDK version judgment, and add other methods to realize this function when it is judged to be a lower version