How to listen for dual sim signal level in android?

Question

I'm developing android launcher application, and want to support the dual sim signal level bars in my app.

package com.example.sms;

import android.content.Context;
import android.os.Bundle;
import android.telephony.PhoneStateListener;
import android.telephony.SignalStrength;
import android.telephony.TelephonyManager;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;

public class MainActivity extends AppCompatActivity {
    private TextView tvSim1SignalLevel, tvSim2SignalLevel;
    private TelephonyManager telephonyManager;
    private SignalLevelListener signalLevelListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        tvSim1SignalLevel = findViewById(R.id.tvSim1SignalLevel);
        tvSim2SignalLevel = findViewById(R.id.tvSim2SignalLevel);

        signalLevelListener = new SignalLevelListener();
        telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);
        telephonyManager.listen(signalLevelListener, PhoneStateListener.LISTEN_SIGNAL_STRENGTHS);
    }

    public class SignalLevelListener extends PhoneStateListener {
        @Override
        public void onSignalStrengthsChanged(SignalStrength signalStrength) {
            super.onSignalStrengthsChanged(signalStrength);

            tvSim1SignalLevel.setText(String.valueOf(signalStrength.getLevel()));
        }
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        telephonyManager.listen(signalLevelListener, PhoneStateListener.LISTEN_NONE);
    }
}

I'm getting default SIM signal level only, How do I get 2nd SIM signal level like in status bar sims signal level icons?

Answer 1

Dual Sim Signal using Telemetry Signal

  fun getRegisteredCellInfo(cellInfos: MutableList<CellInfo>): ArrayList<CellInfo> {
    val registeredCellInfos = ArrayList<CellInfo>()
    if (cellInfos.isNotEmpty()) {
        for (i in cellInfos.indices) {
            if (cellInfos[i].isRegistered) {
                registeredCellInfos.add(cellInfos[i])
            }
        }
    }
    return registeredCellInfos
}


fun getNetworkStrength(): Pair<Int, Int> {

    var strength1 = -1
    var strength2 = -1


    val manager = getSystemService(Context.TELEPHONY_SUBSCRIPTION_SERVICE) as SubscriptionManager


    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

        val telephonyManager = applicationContext.getSystemService(Context.TELEPHONY_SERVICE) as TelephonyManager


        if (telephonyManager.allCellInfo != null) {


            val allCellinfo = telephonyManager.allCellInfo
            val activeSubscriptionInfoList = manager.activeSubscriptionInfoList

           val regCellInfo= getRegisteredCellInfo(allCellinfo)

                activeSubscriptionInfoList.forEachIndexed { Subindex, subs ->

                    if (activeSubscriptionInfoList.size >= 2) {

                        if (regCellInfo.size >= 2) {

                            if (subs.simSlotIndex == 0) {

                                if (subs.carrierName != "No service") {


                                    strength1 = when (val info1 = regCellInfo[0]) {
                                        is CellInfoLte -> info1.cellSignalStrength.dbm
                                        is CellInfoGsm -> info1.cellSignalStrength.dbm
                                        is CellInfoCdma -> info1.cellSignalStrength.dbm
                                        is CellInfoWcdma -> info1.cellSignalStrength.dbm
                                        else -> 0
                                    }

                                    Timber.i("subs $subs")

                                    Timber.i("sim1   ${subs.carrierName}  ${subs.mnc}  $strength1")
                                } else {

                                    strength1 = -1
                                }

                            } else if (subs.simSlotIndex == 1) {

                                if (subs.carrierName != "No service") {

                                    strength2 = when (val info2 = regCellInfo[1]) {
                                        is CellInfoLte -> info2.cellSignalStrength.dbm
                                        is CellInfoGsm -> info2.cellSignalStrength.dbm
                                        is CellInfoCdma -> info2.cellSignalStrength.dbm
                                        is CellInfoWcdma -> info2.cellSignalStrength.dbm
                                        else -> 0
                                    }

                                    Timber.i("sim2   ${subs.carrierName}  $strength2")
                                } else {

                                    strength2 = -1
                                }

                            }

                        }
                    }else if(activeSubscriptionInfoList.size == 1)
                    {

                        if(regCellInfo.size >= 1) {

                            if (subs.simSlotIndex == 0) {

                                if (subs.carrierName != "No service") {


                                    strength1 = when (val info1 = regCellInfo[0]) {
                                        is CellInfoLte -> info1.cellSignalStrength.level
                                        is CellInfoGsm -> info1.cellSignalStrength.level
                                        is CellInfoCdma -> info1.cellSignalStrength.level
                                        is CellInfoWcdma -> info1.cellSignalStrength.level
                                        else -> 0
                                    }

                                    Timber.i("subs $subs")

                                    Timber.i("sim1   ${subs.carrierName}  ${subs.mnc}  $strength1")
                                } else {

                                    strength1 = -1
                                }

                            }
                        }

                        strength2 = -2

                    }
                }

            }
        }

    Timber.i("final strenght   sim1 $strength1  sim2 $strength2")

    return Pair(strength1, strength2)
}