Cách lấy thông tin Cell Info (All Cell Info) trên Android

Lấy All Cell Info (Thông tin đầy đủ các trạm phát) trong Android

Hướng dẫn sử dụng TelephonyManager.getAllCellInfo() - API hiện đại (API 17+) thay thế cho getCellLocation() deprecated. Trả về danh sách CellInfo chứa identity và signal strength cho tất cả trạm phát lân cận (serving + neighbor).

Bước 1: Tạo dự án mới

Android Studio → File → New Project.

Bước 2: Giao diện (res/layout/activity_main.xml)

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="https://schemas.android.com/apk/res/android"
    xmlns:app="https://schemas.android.com/apk/res-auto"
    xmlns:tools="https://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center"
    tools:context=".MainActivity">

    <TextView
        android:id="@+id/text"
        android:textSize="16sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

Bước 3: Code logic (java/MainActivity.java)

package com.example.myapplication;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.RequiresApi;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.telephony.CellInfo;
import android.telephony.CellInfoGsm;
import android.telephony.CellInfoLte;
import android.telephony.CellInfoNr; // API 29+ (5G)
import android.telephony.CellInfoWcdma;
import android.telephony.CellSignalStrength;
import android.telephony.TelephonyManager;
import android.widget.TextView;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    private static final int PERMISSION_REQUEST_CODE = 100;
    TextView textView;
    TelephonyManager telephonyManager;

    @RequiresApi(api = Build.VERSION_CODES.P)
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        textView = findViewById(R.id.text);
        telephonyManager = (TelephonyManager) getSystemService(Context.TELEPHONY_SERVICE);

        if (!hasPermissions()) {
            requestPermissions();
        } else {
            showAllCellInfo();
        }
    }

    private boolean hasPermissions() {
        return ActivityCompat.checkSelfPermission(this, Manifest.permission.READ_PHONE_STATE) == PackageManager.PERMISSION_GRANTED
                && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED;
    }

    private void requestPermissions() {
        ActivityCompat.requestPermissions(this,
                new String[]{Manifest.permission.READ_PHONE_STATE, Manifest.permission.ACCESS_COARSE_LOCATION},
                PERMISSION_REQUEST_CODE);
    }

    @RequiresApi(api = Build.VERSION_CODES.P)
    private void showAllCellInfo() {
        List<CellInfo> cellInfos = telephonyManager.getAllCellInfo();
        StringBuilder sb = new StringBuilder();

        if (cellInfos != null && !cellInfos.isEmpty()) {
            sb.append("Tìm thấy ").append(cellInfos.size()).append(" cell info:\n\n");
            for (int i = 0; i < cellInfos.size(); i++) {
                CellInfo info = cellInfos.get(i);
                sb.append("--- Cell ").append(i + 1).append(" ---\n");
                sb.append("Type: ").append(getCellTypeName(info)).append("\n");
                sb.append("Registered: ").append(info.isRegistered()).append("\n");
                sb.append("TimeStamp: ").append(info.getTimeStamp()).append("\n");

                // Identity
                sb.append(formatIdentity(info)).append("\n");

                // Signal Strength
                CellSignalStrength ss = info.getCellSignalStrength();
                if (ss != null) {
                    sb.append("Signal: ").append(ss.getDbm()).append(" dBm (").append(ss.getLevel()).append("/4)\n");
                    sb.append("  ASU: ").append(ss.getAsuLevel()).append("\n");
                }

                sb.append("\n");
            }
        } else {
            sb.append("Không có CellInfo (cần quyền, SIM, hoặc dịch vụ mạng)");
        }

        textView.setText(sb.toString());
    }

    private String getCellTypeName(CellInfo info) {
        if (info instanceof CellInfoGsm) return "GSM (2G)";
        if (info instanceof CellInfoWcdma) return "WCDMA (3G)";
        if (info instanceof CellInfoLte) return "LTE (4G)";
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && info instanceof CellInfoNr) return "NR (5G)";
        return "Unknown";
    }

    private String formatIdentity(CellInfo info) {
        StringBuilder sb = new StringBuilder();
        if (info instanceof CellInfoGsm) {
            var id = ((CellInfoGsm) info).getCellIdentity();
            sb.append("MCC: ").append(id.getMcc()).append(", MNC: ").append(id.getMnc())
              .append(", CID: ").append(id.getCid()).append(", LAC: ").append(id.getLac());
        } else if (info instanceof CellInfoWcdma) {
            var id = ((CellInfoWcdma) info).getCellIdentity();
            sb.append("MCC: ").append(id.getMcc()).append(", MNC: ").append(id.getMnc())
              .append(", CID: ").append(id.getCid()).append(", LAC: ").append(id.getLac())
              .append(", PSC: ").append(id.getPsc());
        } else if (info instanceof CellInfoLte) {
            var id = ((CellInfoLte) info).getCellIdentity();
            sb.append("MCC: ").append(id.getMcc()).append(", MNC: ").append(id.getMnc())
              .append(", CI: ").append(id.getCi()).append(", TAC: ").append(id.getTac())
              .append(", PCI: ").append(id.getPci());
        } else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.Q && info instanceof CellInfoNr) {
            var id = ((CellInfoNr) info).getCellIdentity();
            sb.append("MCC: ").append(id.getMcc()).append(", MNC: ").append(id.getMnc())
              .append(", NCI: ").append(id.getNci()).append(", PCI: ").append(id.getPci());
        }
        return sb.toString();
    }

    @RequiresApi(api = Build.VERSION_CODES.P)
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_REQUEST_CODE && hasPermissions()) {
            showAllCellInfo();
        }
    }
}

Bước 4: AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="https://schemas.android.com/apk/res/android"
    package="com.example.myapplication">

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />

    <application ...>
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
</manifest>

Ưu điểm của getAllCellInfo()

Hỗ trợ multi-SIM (mỗi subscription có cell info riêng).
Trả về serving cell + neighbor cells (để handover).
Chuẩn hóa cho GSM, WCDMA, LTE, NR (5G) qua các class CellIdentity*.
Kèm SignalStrength chi tiết (dBm, ASU, level) cho từng cell.
Không deprecated.

Yêu cầu quyền (Android 12+ API 31)

Cần CẢ HAI quyền: READ_PHONE_STATE + ACCESS_COARSE_LOCATION (hoặc ACCESS_FINE_LOCATION).

Chạy ứng dụng

Cấp quyền → TextView hiển thị danh sách chi tiết các cell tower lân cận với MCC, MNC, CID, TAC, PCI, RSRP/RSRQ, dBm.

Cách lấy thông tin Cell Info (All Cell Info) trên Android