Android Open Source - ecg Main Activity

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License

The source code is released under:

Copyright (C) 2013 Plasty Grove <plasty.grove@gmail.com> Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Softwar...

Java Source Code

/*
 * Released under MIT License http://opensource.org/licenses/MIT
 * Copyright (c) 2013 Plasty Grove//from   w  w  w .j  ava2  s.  c  om
 * Refer to file LICENSE or URL above for full text 
 */

package com.blueserial;

import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
//import android.content.pm.ActivityInfo;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.util.UUID;

public class MainActivity extends Activity {

    private static final String TAG = "BlueSerial-MainActivity";
    private int mMaxChars = 50000;//Default
    private UUID mDeviceUUID;
    private BluetoothSocket mBTSocket;
    private ReadInput mReadThread = null;

    private boolean mIsUserInitiatedDisconnect = false;

    // All controls here
    private TextView mTxtReceive;
    private Button mBtnDisconnect;
    private GraphView graphView;
    
    private boolean mIsBluetoothConnected = false;
    private BluetoothDevice mDevice;
    private ProgressDialog progressDialog;
    
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        setContentView(R.layout.activity_main);
        graphView = (GraphView) findViewById(R.id.graph_view);
        
        ActivityHelper.initialize(this);

        Intent intent = getIntent();
        Bundle b = intent.getExtras();
        mDevice = b.getParcelable(Homescreen.DEVICE_EXTRA);
        mDeviceUUID = UUID.fromString(b.getString(Homescreen.DEVICE_UUID));
        mMaxChars = b.getInt(Homescreen.BUFFER_SIZE);

        Log.d(TAG, "Ready");

        mBtnDisconnect = (Button) findViewById(R.id.btnDisconnect);
        mTxtReceive = (TextView) findViewById(R.id.txtReceive);

        mTxtReceive.setMovementMethod(new ScrollingMovementMethod());

        mBtnDisconnect.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                mIsUserInitiatedDisconnect = true;
                new DisConnectBT().execute();
            }
        });
    }

    private class ReadInput implements Runnable {

        private boolean bStop = false;
        private Thread t;

        public ReadInput() {
            t = new Thread(this, "Input Thread");
            t.start();
        }

        public boolean isRunning() {
            return t.isAlive();
        }

        @Override
        public void run() {
            InputStream inputStream;

            try {
                inputStream = mBTSocket.getInputStream();
                while (!bStop) {
                   // byte[] buffer = new byte[256];
                    // buffer size increased for ECG
                    byte[] buffer = new byte[512];
                    if (inputStream.available() > 0) {
                        inputStream.read(buffer);
                        int i = 0;
                        /*
                         * This is needed because new String(buffer) is taking the entire buffer i.e. 256 chars on Android 2.3.4 http://stackoverflow.com/a/8843462/1287554
                         */
                        for (i = 0; i < buffer.length && buffer[i] != 0; i++) {
                        }
                        final String strInput = new String(buffer, 0, i);
         
                            mTxtReceive.post(new Runnable() {
                                @Override
                                public void run() {
                                   // mTxtReceive.append(strInput);
                                  //  mTxtReceive.setText(strInput);
                                    String[] items = strInput.split("\\*");
                                    for (String item : items )
                                    {
                                        if(item.length() == 3){
                                      //  mTxtReceive.setText(item);  
                                        try{
                                        final int value = Integer.parseInt(item);
                                        System.out.println("value = "+ value);
                                        graphView.plotProcedure(value);
                                        }catch(NumberFormatException ex){ // handle your exception
                                             System.out.println("Not an integer");                                   
                                        }
                                        }
                                    }                                 
                                }   
                            });
                    }
                    Thread.sleep(500);
                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
        public void stop() {
            bStop = true;
        }
    }

    private class DisConnectBT extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
        }

        @Override
        protected Void doInBackground(Void... params) {

            if (mReadThread != null) {
                mReadThread.stop();
                while (mReadThread.isRunning())
          ; // Wait until it stops
                mReadThread = null;
            }
            try {
                mBTSocket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);
            mIsBluetoothConnected = false;
            if (mIsUserInitiatedDisconnect) {
                finish();
            }
        }
    }

    private void msg(String s) {
        Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
    }

    @Override
    protected void onPause() {
        if (mBTSocket != null && mIsBluetoothConnected) {
            new DisConnectBT().execute();
        }
        Log.d(TAG, "Paused");
        super.onPause();
    }

    @Override
    protected void onResume() {
        if (mBTSocket == null || !mIsBluetoothConnected) {
            new ConnectBT().execute();
        }
        Log.d(TAG, "Resumed");
        super.onResume();
    }

    @Override
    protected void onStop() {
        Log.d(TAG, "Stopped");
        super.onStop();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        // TODO Auto-generated method stub
        super.onSaveInstanceState(outState);
    }

    private class ConnectBT extends AsyncTask<Void, Void, Void> {

        private boolean mConnectSuccessful = true;

        @Override
        protected void onPreExecute() {
            progressDialog = ProgressDialog.show(MainActivity.this, "Hold on", "Connecting");// http://stackoverflow.com/a/11130220/1287554
        }

        @Override
        protected Void doInBackground(Void... devices) {

            try {
                if (mBTSocket == null || !mIsBluetoothConnected) {
                    mBTSocket = mDevice.createInsecureRfcommSocketToServiceRecord(mDeviceUUID);
                    BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
                    mBTSocket.connect();
                }
            } catch (IOException e) {
                // Unable to connect to device
                e.printStackTrace();
                mConnectSuccessful = false;
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            super.onPostExecute(result);

            if (!mConnectSuccessful) {
                Toast.makeText(getApplicationContext(), "Could not connect to device. Is it a Serial device? Also check if the UUID is correct in the settings", Toast.LENGTH_LONG).show();
                finish();
            } else {
                msg("Connected to device");
                mIsBluetoothConnected = true;
                mReadThread = new ReadInput(); // Kick off input reader
            }

            progressDialog.dismiss();
        }

    }

}

Java Source Code List

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