FeatureExtractionActivity.java

package org.spin.gaitlib.gaitlogger;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.Spinner;

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;

/**
 * This class creates the SQLite database from the CSV files generated by GaitLogger on the
 * smartphone. The files to be used for feature extractions, one "study" file and one or more
 * "accel" files should be grouped in a single folder under the gaitlogger application data folder.<br>
 * *
 * 
 * @author LL; note: most of scanForFiles, createDumpFile, and extractFeatures were translated from
 *         Python and/or re-implemented and streamlined by LL
 */
public class FeatureExtractionActivity extends Activity {

    public static final String SELECTED_DATA_FOLDER = "org.spin.gaitlib.gaitlogger.selecteddatafolder";
    public static final String PARAM_WINDOW_SIZE = "org.spin.gaitlib.gaitlogger.windowsize";
    public static final String PARAM_SAMPLING_INTERVAL = "org.spin.gaitlib.gaitlogger.samplinginterval";
    public static final String PARAM_MIN_DATA_POINTS = "org.spin.gaitlib.gaitlogger.mindatapoints";

    public static final String UPDATE_TYPE_ADDITION = "org.spin.gaitlib.gaitlogger.status.addition";
    public static final String UPDATE_TYPE_REPLACEMENT = "org.spin.gaitlib.gaitlogger.status.replacement";

    private Intent featureExtractionService;
    private final FeatureExtractionServiceReceiver featureExtractionServiceReceiver = new FeatureExtractionServiceReceiver();

    /**
     * A list of status messages to be shown on the screen.
     */
    private final ArrayList<String> progressDetails = new ArrayList<String>();
    private ArrayAdapter<String> progressListAdapter;
    
    private Button featureExtractionButton;

    /**
     * The name of the folder selected by user.
     */
    private String dataFolderName;

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

        setUpFolerSelectionSpinner();
        featureExtractionButton = (Button) findViewById(R.id.btnPerformFeatureExtraction);
        setUpLaunchFeatureExtractButton();

        ListView progressListView = (ListView) findViewById(R.id.progressDetails);
        progressListAdapter = new ArrayAdapter<String>(FeatureExtractionActivity.this,
                android.R.layout.simple_list_item_1, progressDetails);
        progressListView.setAdapter(progressListAdapter);
    }

    /**
     * Populate drop down list with the names of all the gaitlogger folders (i.e. the folders that
     * contain CSV files).
     */
    private void setUpFolerSelectionSpinner() {
        FilenameFilter dataFolderFiler = new FilenameFilter() {

            @Override
            public boolean accept(File dir, String filename) {
                return filename.startsWith(FileManagerUtil.DATA_FOLDER_PREFIX);
            }
        };

        String[] dataFolderNames = FileManagerUtil.getDataFoldersParentDirectory().list(
                dataFolderFiler);

        Spinner spinner = (Spinner) findViewById(R.id.spinnerFolders);
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_spinner_dropdown_item, dataFolderNames);
        spinner.setAdapter(adapter);

        spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int pos, long id) {
                dataFolderName = (String) parent.getItemAtPosition(pos);
            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {
            }
        });
    }

    private void setUpLaunchFeatureExtractButton() {
        featureExtractionButton.setText(R.string.LaunchFeatureExtractionText);
        featureExtractionButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                progressDetails.clear();
                if (dataFolderName == null) {
                    progressDetails.add("No Data.");
                    return;
                }
                featureExtractionService = new Intent(FeatureExtractionActivity.this,
                        FeatureExtractionService.class);
                featureExtractionService.putExtra(SELECTED_DATA_FOLDER, dataFolderName);
                featureExtractionService.putExtra(PARAM_WINDOW_SIZE, 2000);
                featureExtractionService.putExtra(PARAM_SAMPLING_INTERVAL, 1000);
                featureExtractionService.putExtra(PARAM_MIN_DATA_POINTS, 30);
                startService(featureExtractionService);
                setUpCancelFeatureExtractionButton();
            }

        });
    }

    private void setUpCancelFeatureExtractionButton() {
        featureExtractionButton.setText(R.string.CancelFeatureExtractionText);
        featureExtractionButton.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                stopService(featureExtractionService);
                setUpLaunchFeatureExtractButton();
            }

        });
    }

    @Override
    protected void onResume() {
        registerReceiver(featureExtractionServiceReceiver, new IntentFilter(
                FeatureExtractionService.STATUS_UPDATE));
        super.onResume();
    }

    @Override
    protected void onPause() {
        unregisterReceiver(featureExtractionServiceReceiver);
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        unregisterReceiver(featureExtractionServiceReceiver);
        stopService(featureExtractionService);
        super.onDestroy();
    }

    public class FeatureExtractionServiceReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            if (action == null) {
                return;
            }
            if (FeatureExtractionService.STATUS_UPDATE.equals(action)) {
                String statusMessage = intent
                        .getStringExtra(FeatureExtractionService.STATUS_MESSAGE);
                String updateType = intent
                        .getStringExtra(FeatureExtractionService.STATUS_UPDATE_TYPE);
                if (UPDATE_TYPE_REPLACEMENT.equals(updateType)) {
                    progressDetails.set(progressDetails.size() - 1, statusMessage);
                } else {
                    progressDetails.add(statusMessage);
                }
                progressListAdapter.notifyDataSetChanged();
                
                if (getString(R.string.ServiceStoppedText).equals(statusMessage)){
                    setUpLaunchFeatureExtractButton();
                }
            }
        }
    }
}