在蓝牙后台扫描的代码中添加以下代码段，以确保扫描持续进行，并避免由于系统资源不足导致扫描停止的问题。

// Restart scan when it stops
private final ScanCallback mScanCallback = new ScanCallback() {
    @Override
    public void onScanResult(int callbackType, ScanResult result) {
        // Handle scan result data
    }

    @Override
    public void onScanFailed(int errorCode) {
        // Handle scan failure
    }
};

private final Handler mHandler = new Handler();
private final Runnable mScanRunnable = new Runnable() {
    @Override
    public void run() {
        mBluetoothLeScanner.startScan(mScanCallback);
        mHandler.postDelayed(this, 60 * 1000); // Restart scan every minute
    }
};

// Start scan
mBluetoothLeScanner.startScan(mScanCallback);
mHandler.postDelayed(mScanRunnable, 60 * 1000); // Schedule scan to restart every minute