Create a new Activity to visualize CSI data

[StevenMHernandez]

In an older version of this project, I had a way to visualize CSI live. See: (#5 (comment))
The (private) implementation can be found here: (https://github.com/StevenMHernandez/AndroidCSICollector/blob/master/app/src/main/java/com/stevenmhernandez/csicollector/MainActivity.java)

[gmcd310]

Dear Steven，This link won't open。

[StevenMHernandez]

Yes, it is a private codebase currently.

[gmcd310]

How do I view the code

[StevenMHernandez]

Sorry, the link was for my own future reference.

Are you are interested in helping contributing to this open source codebase? If so, below is the untested and slightly edited code that I was linking. Try to create a new Activity (VisualizationMainActivity.java). You can use this code as a starting point, however, you will need to fix any issues that you find yourself. It might be useful to also use https://github.com/StevenMHernandez/Android-CSI-Labelling-App/blob/master/app/src/main/java/com/stevenmhernandez/csi_labelling_app/Experiments/ToggleMainActivity.java as a reference too.

public class VisualizationMainActivity extends AppCompatActivity implements CSIDataInterface {

    public static final String TAG = "VisualizationMainActivity";

    public ImageView imageView;
    public Button toggleHeatmapButton;
    public Button toggleFrameRateButton;
    public TextView experimentTextView;
    public TextView frameRateTextView;
    public TextView totalFrameRateTextView;

    Bitmap bmCurrent;

    double heatmapMax = 0;
    double heatmapMin = 9999;

    BaseDataCollectorService dataCollectorService = new FileDataCollectorService();

    final Handler handler = new Handler();

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

        dataCollectorService.setup(this);

        this.imageView = findViewById(R.id.imageView);
        this.toggleHeatmapButton = findViewById(R.id.toggleHeatmapButton);
        this.toggleFrameRateButton = findViewById(R.id.toggleFrameRateButton);
        this.experimentTextView = findViewById(R.id.experimentTextView);
        this.frameRateTextView = findViewById(R.id.frameRateTextView);
        this.totalFrameRateTextView = findViewById(R.id.totalFrameRateTextView);
    }

    private double[] parseCsi(String csi, boolean returnPhases) {
        String[] strs = csi.trim().split(" ");
        try {
            int[] im_ints = new int[strs.length / 2];
            int[] real_ints = new int[strs.length / 2];
            double[] amplitudes = new double[strs.length / 2];
            double[] phases = new double[strs.length / 2];

            for (int i = 0; i < strs.length; i++) {
                if (i % 2 == 0) {
                    im_ints[(int) Math.floor(i / 2.0)] = Integer.parseInt(strs[i]);
                } else {
                    real_ints[(int) Math.floor(i / 2.0)] = Integer.parseInt(strs[i]);
                }
            }

            for (int i = 0; i < strs.length / 2; i++) {
                amplitudes[i] = Math.sqrt(im_ints[i] ^ 2 + real_ints[i] ^ 2);
                phases[i] = Math.atan2(im_ints[i], real_ints[i]);
            }

            if (returnPhases) {
                return phases;
            } else {
                return amplitudes;
            }
        } catch (Exception e) {
            Log.e("Some error in parsing CSI String", csi);
            Log.e("ERROR:", e.getLocalizedMessage());
        }

        return null;
    }

    long sampleRateStartTime = 0;
    int sampleCount = 0;
    int totalSampleCount = 0;
    boolean CONFIG_PRINT_SAMPLE_RATE = true;
    boolean CONFIG_PRINT_HEATMAP = false;


    private void addCsi(String csi) {
        if (CONFIG_PRINT_SAMPLE_RATE) {
            if (sampleRateStartTime + 1000 < System.currentTimeMillis()) {
                this.frameRateTextView.setText(Integer.toString(sampleCount) + " samples last second");
                sampleRateStartTime = System.currentTimeMillis();
                sampleCount = 0;
            }

            sampleCount++;
            totalSampleCount++;

            this.totalFrameRateTextView.setText(Integer.toString(totalSampleCount) + " samples collected");
        }
        if (CONFIG_PRINT_HEATMAP) {
            if (bmCurrent == null) {
                bmCurrent = BitmapFactory.decodeResource(getResources(), R.drawable.cat);
                bmCurrent = Bitmap.createScaledBitmap(bmCurrent, 64, 100, false);
            }

            double[] amplitudes = parseCsi(csi, false);

            if (amplitudes != null) {
                Bitmap bm = bmCurrent;


                int width = bm.getWidth();
                int height = bm.getHeight();

                Log.i("width", String.valueOf(width));
                Log.i("height", String.valueOf(height));

                int[] pixels = new int[(width + 2) * (height + 2)];
                bm.getPixels(pixels, height, width, 0, 1, width, height - 1);
                bm.setPixels(pixels, height, width, 0, 0, width, height - 1);
                for (int i = 0; i < Math.min(amplitudes.length, 64); i++) {
                    if (amplitudes[i] > heatmapMax) {
                        heatmapMax = amplitudes[i];
                    }
                    if (amplitudes[i] < heatmapMin) {
                        heatmapMin = amplitudes[i];
                    }
                    bm.setPixel(i, height - 1, Color.rgb((int) ((amplitudes[i] - heatmapMin) * (heatmapMax - heatmapMin) * 256.0), 0, 0));
                }


                bmCurrent = bm;

                Bitmap finalBm = Bitmap.createScaledBitmap(bmCurrent, 640, 1000, false);

                this.imageView.setImageBitmap(finalBm);
            }
        }
    }

    public void toggleHeatmap(View view) {
        CONFIG_PRINT_HEATMAP = !CONFIG_PRINT_HEATMAP;
        toggleHeatmapButton.setText(CONFIG_PRINT_HEATMAP ? "HM OFF" : "HM ON");
    }

    public void toggleFrameRate(View view) {
        CONFIG_PRINT_SAMPLE_RATE = !CONFIG_PRINT_SAMPLE_RATE;
        if (CONFIG_PRINT_SAMPLE_RATE) {
            toggleFrameRateButton.setText("FR OFF");
        } else {
            toggleFrameRateButton.setText("FR ON");
            frameRateTextView.setText("");
            totalFrameRateTextView.setText("");
        }
    }



    @Override
    protected void onResume() {
        super.onResume();
        csiSerial.onResume(this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        csiSerial.onPause(this);
    }

    public String updateCsiString(Activity activity, String currentAction) {
        String deviceId = Settings.Secure.getString(activity.getContentResolver(), Settings.Secure.ANDROID_ID);
        return String.format("CURRENT_ACTION,%s,%d,%s\n", deviceId, System.currentTimeMillis(), currentAction);
    }


    long csiCounter = 0;
    long csiPerSecondCounter = 0;
    long counterStart = System.currentTimeMillis();
    long csiPerSecondCounterFinal = 0;
}

Currently, I am too busy to work on this myself.

[gmcd310]

Thank you very much，I will to try