要获取不同设备上的"altbeacon RSSI"，可以使用Android的蓝牙API来扫描设备并获取RSSI值。以下是一个示例代码：

首先，在你的AndroidManifest.xml文件中添加蓝牙权限：

然后，在你的Activity中，添加以下代码来扫描设备并获取RSSI值：

import android.Manifest;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothManager;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.os.Handler;
import android.util.Log;
import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import org.altbeacon.beacon.Beacon;
import org.altbeacon.beacon.BeaconConsumer;
import org.altbeacon.beacon.BeaconManager;
import org.altbeacon.beacon.BeaconParser;
import org.altbeacon.beacon.RangeNotifier;
import org.altbeacon.beacon.Region;

import java.util.Collection;

public class MainActivity extends AppCompatActivity implements BeaconConsumer {
    private static final int PERMISSION_REQUEST_COARSE_LOCATION = 1;
    private static final String TAG = "BeaconScanner";
    private BeaconManager beaconManager;

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

        // 检查蓝牙权限
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION)
                != PackageManager.PERMISSION_GRANTED) {
            ActivityCompat.requestPermissions(this,
                    new String[]{Manifest.permission.ACCESS_COARSE_LOCATION},
                    PERMISSION_REQUEST_COARSE_LOCATION);
        }

        // 初始化BeaconManager
        beaconManager = BeaconManager.getInstanceForApplication(this);
        beaconManager.getBeaconParsers().add(new BeaconParser().
                setBeaconLayout(BeaconParser.EDDYSTONE_UID_LAYOUT));
        beaconManager.bind(this);
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        beaconManager.unbind(this);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSION_REQUEST_COARSE_LOCATION: {
                if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    Log.d(TAG, "Coarse location permission granted");
                } else {
                    final AlertDialog.Builder builder = new AlertDialog.Builder(this);
                    builder.setTitle("功能受限");
                    builder.setMessage("请提供粗略位置权限以使用蓝牙扫描");
                    builder.setPositiveButton(android.R.string.ok, null);
                    builder.setOnDismissListener(new DialogInterface.OnDismissListener() {
                        @Override
                        public void onDismiss(DialogInterface dialog) {
                            finish();
                        }
                    });
                    builder.show();
                }
                return;
            }
        }
    }

    @Override
    public void onBeaconServiceConnect() {
        final Region region = new Region("all-beacons-region", null, null, null);

        beaconManager.addRangeNotifier(new RangeNotifier() {
            @Override
            public void didRangeBeaconsInRegion(Collection beacons, Region region) {
                if (beacons.size() > 0) {
                    Beacon beacon = beacons.iterator().next();
                    Log.d(TAG, "The first beacon " + beacon.toString() + " is about " + beacon.getDistance() + " meters away.");
                    int rssi = beacon.getRssi();
                    // 在这里处理RSSI值
                    handleRssi(rssi);
                }
            }
        });

        try {
            beaconManager.startRangingBeaconsInRegion(region);
        } catch (RemoteException e) {
            e.printStackTrace();
        }
    }

    private void handleRssi(int rssi) {
        // 在这里处理RSSI值
        Log.d(TAG, "Received RSSI value: " + rssi);
    }
}

这个示例代码使用了AltBeacon库来进行蓝牙扫描和解析，它提供了获取RSSI值的方法。你可以在handleRssi()方法中处理获取到的RSSI值。

请注意，要在Android 6.0及以上版本上运行此代码，你需要在运行时请求粗略位置权限。代码中的onRequestPermissionsResult()方法处理了权限请求的结果和提示用户进行授权。

希望这个示例代码能对你有所帮助！