Android Open Source - DisasterRadioAndroid Main Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package com.example.firstapp;
/* w  ww  .jav  a 2s.c  o m*/
import java.io.IOException;
import java.util.UUID;

import android.os.Bundle;
import android.app.Activity;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.Menu;
import android.widget.TextView;

public class MainActivity extends Activity {

  // TODO these should probably not be hardcoded here
  private final static String serverBTName = "DisasterRadio";
  private final static UUID serverUUID = UUID.fromString("2d9883d8-7d88-4ca0-a444-6a8cfe2087d7");
  
  private final static int REQUEST_ENABLE_BT = 100;
  private BluetoothAdapter mBluetoothAdapter;
  private BluetoothBroadcastReceiver mReceiver;
  private BluetoothSocket sock;

  private TextView statusText; 
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
        statusText = (TextView) findViewById(R.id.StatusText);
        statusText.setText("Initializing.\n");
        
        
        statusText.append("Checking for bluetooth support...\n");
        
        mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        if (mBluetoothAdapter == null) {
            // Device does not support Bluetooth
          statusText.append("Device doest not appear to support bluetooth :(\n");
        } else {
          statusText.append("Bluetooth support detected!\n");
        }
        
        if (!mBluetoothAdapter.isEnabled()) {
          statusText.append("Enabling bluetooth...\n");
            Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
            startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT);
        } else {
          statusText.append("Bluetooth was already enabled.\n");
          prepareDiscovery();
        }
    }
    
    private void prepareDiscovery() {
      // Register the BroadcastReceiver
      
      mReceiver = new BluetoothBroadcastReceiver() {
          public void discoveryCompletedCallback() {
            statusText.append("Existing discovery cancelled\n");
            beginDiscovery();
            unregisterReceiver(mReceiver);
          }
        };
      
        if (mBluetoothAdapter.isDiscovering()){
          statusText.append("Cancelling existing discovery\n");
          IntentFilter filter = new IntentFilter();
          filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
          registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy
          mBluetoothAdapter.cancelDiscovery();
        } else {
          beginDiscovery();
        }
    }
    
    private void beginDiscovery() {
      // Register the BroadcastReceiver
      
      mReceiver = new BluetoothBroadcastReceiver() {
          public void deviceDiscoveredCallback(BluetoothDevice device) {
            statusText.append("Found device: " + device.getName() + " - " + device.getAddress() + "\n");
            checkDevice(device);
          }
          public void discoveryCompletedCallback() {
            statusText.append("Discovery ended\n");
            unregisterReceiver(mReceiver);
          }
        };
      
      IntentFilter filter = new IntentFilter();
      filter.addAction(BluetoothDevice.ACTION_FOUND);
      filter.addAction(BluetoothAdapter.ACTION_DISCOVERY_FINISHED);
      
      registerReceiver(mReceiver, filter); // Don't forget to unregister during onDestroy
      
      statusText.append("Starting discovery\n");
      mBluetoothAdapter.startDiscovery();
    }

    private void checkDevice(BluetoothDevice device) {
      
      if(device.getName().equals(serverBTName)) {
        unregisterReceiver(mReceiver);
        mBluetoothAdapter.cancelDiscovery();
        statusText.append("Found Disaster Radio server!\n");
        initComms(device);
      }
    }
    
    private void initComms(BluetoothDevice device) {
      try {
        statusText.append("Opening socket...\n");
//      sock = device.createInsecureRfcommSocketToServiceRecord(serverUUID);
        sock = device.createRfcommSocketToServiceRecord(serverUUID);
      sock.connect();
      statusText.append("Socket open!\n");
      //sock.getOutputStream().write(100);
    } catch (IOException e) {
      // TODO Auto-generated catch block
      statusText.append("Socket creation failed.\n");
      e.printStackTrace();
    }
    }
    
    protected void onActivityResult (int requestCode, int resultCode, Intent data) {
      statusText = (TextView) findViewById(R.id.StatusText);
      
      if(requestCode == REQUEST_ENABLE_BT) {
        
        if(resultCode == RESULT_OK) {
          statusText.append("Bluetooth enabled!\n");
          prepareDiscovery();
        } else {
          statusText.append("Enabling bluetooth failed.\n");
        }
      
      }
      
    }
    
    public void onDestroy() {
      unregisterReceiver(mReceiver);
      super.onDestroy();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }
    
}

Java Source Code List

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