Refactor HandlerInjector to SettingsLib

- Plan to share the HandlerInjector class to System UI.

Bug: 194186477
Test: manual test
atest InternetResetHelperTest

Change-Id: I4b1b72ac7742bcfdd89ae61d9f88df1c64224f1f

tests/unit/src/com/android/settings/network/InternetResetHelperTest.java

@@ -29,6 +29,7 @@ import android.content.BroadcastReceiver;
 import android.content.Context;
 import android.content.IntentFilter;
 import android.net.wifi.WifiManager;
+import android.os.Handler;
 import android.os.HandlerThread;
 import android.os.Looper;
 
@@ -39,6 +40,7 @@ import androidx.test.core.app.ApplicationProvider;
 import androidx.test.ext.junit.runners.AndroidJUnit4;
 
 import com.android.settingslib.connectivity.ConnectivitySubsystemsRecoveryManager;
+import com.android.settingslib.utils.HandlerInjector;
 
 import org.junit.Before;
 import org.junit.Rule;
@@ -71,12 +73,12 @@ public class InternetResetHelperTest {
 
     private FakeHandlerInjector mFakeHandlerInjector;
 
-    private static class FakeHandlerInjector extends InternetResetHelper.HandlerInjector {
+    private static class FakeHandlerInjector extends HandlerInjector {
 
         private Runnable mRunnable;
 
-        FakeHandlerInjector(Context context) {
-            super(context);
+        FakeHandlerInjector(Handler handler) {
+            super(handler);
         }
 
         @Override
@@ -104,7 +106,7 @@ public class InternetResetHelperTest {
         final Lifecycle lifecycle = mock(Lifecycle.class);
         mInternetResetHelper = new InternetResetHelper(mContext, lifecycle);
         mInternetResetHelper.mWorkerThread = mWorkerThread;
-        mFakeHandlerInjector = new FakeHandlerInjector(mContext);
+        mFakeHandlerInjector = new FakeHandlerInjector(mContext.getMainThreadHandler());
         mInternetResetHelper.mHandlerInjector = mFakeHandlerInjector;
         mInternetResetHelper.mConnectivitySubsystemsRecoveryManager =
                 mConnectivitySubsystemsRecoveryManager;