Settings: Add a toggle to force LTE_CA

Change-Id: I017be698dc6c438edf2236df7c0125c05202bf3b
Signed-off-by: DarkJoker360 <simoespo159@gmail.com>

src/com/android/settings/network/telephony/ForceLteCaPreferenceController.java

@@ -0,0 +1,159 @@
+package com.android.settings.network.telephony;
+
+import android.content.Context;
+import android.os.PersistableBundle;
+import android.telephony.CarrierConfigManager;
+import android.telephony.SubscriptionManager;
+import android.telephony.TelephonyCallback;
+import android.telephony.TelephonyManager;
+import android.os.SystemProperties;
+import android.util.Log;
+
+import androidx.annotation.VisibleForTesting;
+import androidx.preference.Preference;
+import androidx.preference.PreferenceScreen;
+import androidx.preference.SwitchPreferenceCompat;
+
+import com.android.internal.telephony.util.ArrayUtils;
+import com.android.settingslib.core.lifecycle.LifecycleObserver;
+import com.android.settingslib.core.lifecycle.events.OnStart;
+import com.android.settingslib.core.lifecycle.events.OnStop;
+
+/**
+ * Preference controller for "Force LTE_CA" hack
+ */
+public class ForceLteCaPreferenceController extends TelephonyTogglePreferenceController
+        implements LifecycleObserver, OnStart, OnStop {
+
+    private static final String TAG = "ForceLteCaSettings";
+
+    private static final String KEY_PROP = "persist.sys.radio.force_lte_ca";
+
+    @VisibleForTesting
+    Preference mPreference;
+    private TelephonyManager mTelephonyManager;
+    private PhoneCallStateTelephonyCallback mTelephonyCallback;
+    private Integer mCallState;
+
+    public ForceLteCaPreferenceController(Context context, String key) {
+        super(context, key);
+        mTelephonyManager = context.getSystemService(TelephonyManager.class);
+    }
+
+    /**
+     * Initial this PreferenceController.
+     * @param subId The subscription Id.
+     * @return This PreferenceController.
+     */
+    public ForceLteCaPreferenceController init(int subId) {
+        Log.d(TAG, "init: ");
+        if (mTelephonyCallback == null) {
+            mTelephonyCallback = new PhoneCallStateTelephonyCallback();
+        }
+
+        mSubId = subId;
+
+        if (mTelephonyManager == null) {
+            mTelephonyManager = mContext.getSystemService(TelephonyManager.class);
+        }
+
+        if (SubscriptionManager.isValidSubscriptionId(subId)) {
+            mTelephonyManager = mTelephonyManager.createForSubscriptionId(subId);
+        }
+
+        PersistableBundle carrierConfig = getCarrierConfigForSubId(subId);
+        if (carrierConfig == null) {
+            return this;
+        }
+        return this;
+    }
+
+    @Override
+    public int getAvailabilityStatus(int subId) {
+        init(subId);
+        if (SubscriptionManager.isValidSubscriptionId(mSubId)) {
+            return AVAILABLE;
+        }
+        return CONDITIONALLY_UNAVAILABLE;
+    }
+
+    @Override
+    public void displayPreference(PreferenceScreen screen) {
+        super.displayPreference(screen);
+        mPreference = screen.findPreference(getPreferenceKey());
+    }
+
+    @Override
+    public void onStart() {
+        if (mTelephonyCallback == null) {
+            return;
+        }
+        mTelephonyCallback.register(mTelephonyManager);
+    }
+
+    @Override
+    public void onStop() {
+        if (mTelephonyCallback == null) {
+            return;
+        }
+        mTelephonyCallback.unregister();
+    }
+
+    @Override
+    public void updateState(Preference preference) {
+        super.updateState(preference);
+        if (preference == null) {
+            return;
+        }
+        final SwitchPreferenceCompat switchPreference = (SwitchPreferenceCompat) preference;
+        switchPreference.setEnabled(isUserControlAllowed());
+    }
+
+    @Override
+    public boolean setChecked(boolean isChecked) {
+        if (!SubscriptionManager.isValidSubscriptionId(mSubId)) {
+            return false;
+        }
+        Log.d(TAG, "setChecked: " + isChecked);
+        SystemProperties.set(KEY_PROP, String.valueOf(isChecked));
+        return true;
+    }
+
+    @Override
+    public boolean isChecked() {
+        return SystemProperties.getBoolean(KEY_PROP, false);
+    }
+
+    private boolean isUserControlAllowed() {
+        return SubscriptionManager.isValidSubscriptionId(mSubId);
+    }
+
+    private class PhoneCallStateTelephonyCallback extends TelephonyCallback implements
+            TelephonyCallback.CallStateListener {
+
+        private TelephonyManager mLocalTelephonyManager;
+
+        @Override
+        public void onCallStateChanged(int state) {
+            mCallState = state;
+            updateState(mPreference);
+        }
+
+        public void register(TelephonyManager telephonyManager) {
+            mLocalTelephonyManager = telephonyManager;
+
+            // assign current call state so that it helps to show correct preference state even
+            // before first onCallStateChanged() by initial registration.
+            mCallState = mLocalTelephonyManager.getCallState();
+            mLocalTelephonyManager.registerTelephonyCallback(
+                    mContext.getMainExecutor(), mTelephonyCallback);
+        }
+
+        public void unregister() {
+            mCallState = null;
+            if (mLocalTelephonyManager != null) {
+                mLocalTelephonyManager.unregisterTelephonyCallback(this);
+            }
+        }
+    }
+}

src/com/android/settings/network/telephony/MobileNetworkSettings.java

@@ -330,6 +330,7 @@ public class MobileNetworkSettings extends AbstractMobileNetworkSettings impleme
         use(ContactDiscoveryPreferenceController.class).init(getParentFragmentManager(), mSubId);
         use(NrAdvancedCallingPreferenceController.class).init(mSubId);
         use(TransferEsimPreferenceController.class).init(mSubId, mSubscriptionInfoEntity);
+        use(ForceLteCaPreferenceController.class).init(mSubId);
         final ConvertToEsimPreferenceController convertToEsimPreferenceController =
                 use(ConvertToEsimPreferenceController.class);
         if (convertToEsimPreferenceController != null) {