Android Open Source - habhub-chase-car-tracker Main

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License

The source code is released under:

Copyright (c) 2012, Priyesh Patel All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1...

Java Source Code

package com.pexat.habhub.chasecartracker;
//w  ww .j a va  2 s .c  om
import android.app.Activity;
import android.app.ActivityManager;
import android.app.ActivityManager.RunningServiceInfo;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.os.Handler;
import android.os.IBinder;
import android.os.Message;
import android.os.Messenger;
import android.os.RemoteException;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Main extends Activity {
  // Preferences
  public static final String PREFS_NAME = "ChaseCarTrackerPrefs";

  // Dialogs
  private static final int DIALOG_SET_CALLSIGN = 1;

  // UI Elements
  private TextView txt_latitude, txt_longitude, txt_altitude, txt_speed, txt_callsign, txt_lastupdated;
  private Button btn_toggle;

  // Service
  private Messenger tsOutgoing = null;
  private boolean isBound = false;
  private final Messenger tsIncoming = new Messenger(new TrackerServiceIncomingHandler());

  // Current callsign
  private String callsign;

  /**
   * Activity Setup
   */

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);

    txt_latitude = (TextView) findViewById(R.id.txt_latitude);
    txt_longitude = (TextView) findViewById(R.id.txt_longitude);
    txt_altitude = (TextView) findViewById(R.id.txt_altitude);
    txt_speed = (TextView) findViewById(R.id.txt_speed);
    txt_callsign = (TextView) findViewById(R.id.txt_callsign);
    txt_lastupdated = (TextView) findViewById(R.id.txt_last_updated);
    btn_toggle = (Button) findViewById(R.id.btn_toggle);

    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
    setNewCallsign(settings.getString("callsign", ""));

    if (trackerServiceRunning()) {
      doBindService();
      btn_toggle.setText("Stop Tracker");
    }

    btn_toggle.setOnClickListener(new OnClickListener() {
      public void onClick(View v) {
        if (!isBound) {
          Intent i = new Intent(Main.this, TrackerService.class);
          i.putExtra("callsign", callsign);
          startService(i);
          doBindService();
          btn_toggle.setText("Stop Tracker");
        } else {
          doUnbindService();
          stopService(new Intent(Main.this, TrackerService.class));
          btn_toggle.setText("Start Tracker");
        }
      }
    });
  }

  @Override
  public void onDestroy() {
    super.onDestroy();
    try {
      doUnbindService();
    } catch (Throwable t) {
      t.printStackTrace();
    }
  }

  /**
   * Service Communications
   */

  private class TrackerServiceIncomingHandler extends Handler {
    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        case TrackerService.MSG_GPS_DATA :
          Bundle b = msg.getData();
          txt_latitude.setText(b.getString("latitude") + "");
          txt_longitude.setText(b.getString("longitude") + "");
          txt_altitude.setText(b.getString("altitude") + " m");
          txt_speed.setText(b.getString("speed") + " km/h");
          txt_lastupdated.setText(b.getString("time"));
          break;
        default :
          super.handleMessage(msg);
          break;
      }
    }
  }

  private ServiceConnection tsConnection = new ServiceConnection() {
    public void onServiceConnected(ComponentName name, IBinder service) {
      tsOutgoing = new Messenger(service);
      try {
        Message msg = Message.obtain(null, TrackerService.MSG_REGISTER_CLIENT);
        msg.replyTo = tsIncoming;
        tsOutgoing.send(msg);
      } catch (RemoteException e) {
        e.printStackTrace();
      }
    }

    public void onServiceDisconnected(ComponentName name) {
      tsOutgoing = null;
    }
  };

  private void doBindService() {
    bindService(new Intent(this, TrackerService.class), tsConnection, Context.BIND_AUTO_CREATE);
    isBound = true;
  }

  private void doUnbindService() {
    if (!isBound)
      return;

    if (tsOutgoing != null) {
      try {
        Message msg = Message.obtain(null, TrackerService.MSG_DEREGISTER_CLIENT);
        msg.replyTo = tsIncoming;
        tsOutgoing.send(msg);
      } catch (RemoteException e) {
        e.printStackTrace();
      }
    }

    unbindService(tsConnection);
    isBound = false;
  }

  /**
   * Dialog & Menu
   */

  @Override
  protected Dialog onCreateDialog(int id) {
    switch (id) {
      case DIALOG_SET_CALLSIGN :
        LayoutInflater inflater = LayoutInflater.from(this);
        final View layout = inflater.inflate(R.layout.callsign_dialog, null);
        final EditText txt_editCallsign = (EditText) layout.findViewById(R.id.txt_callsign_dialog);
        txt_editCallsign.setText(callsign);

        final AlertDialog d = new AlertDialog.Builder(this).setTitle("Set Callsign").setView(layout).setPositiveButton("OK", null).create();

        d.setOnDismissListener(new DialogInterface.OnDismissListener() {
          public void onDismiss(DialogInterface dialog) {
            String nc = txt_editCallsign.getText().toString();
            if (nc.equals("")) {
              txt_editCallsign.setError("Please enter a callsign");
              d.show();
            } else {
              setNewCallsign(nc);
            }
          }
        });

        return d;

      default :
        return super.onCreateDialog(id);
    }
  }

  @Override
  public boolean onCreateOptionsMenu(Menu menu) {
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.options, menu);
    return true;
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case R.id.opt_callsign :
        showDialog(DIALOG_SET_CALLSIGN);
        return true;
      case R.id.opt_about :
        startActivity(new Intent(this, About.class));
        return true;
      default :
        return super.onOptionsItemSelected(item);
    }
  }

  /**
   * Helper Functions
   */

  // Check if tracker service is running
  private boolean trackerServiceRunning() {
    ActivityManager manager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
    for (RunningServiceInfo service : manager.getRunningServices(Integer.MAX_VALUE)) {
      if ("com.pexat.habhub.chasecartracker.TrackerService".equals(service.service.getClassName())) {
        return true;
      }
    }
    return false;
  }

  // Set a new callsign
  private void setNewCallsign(String c) {
    if (c.equals("")) {
      showDialog(DIALOG_SET_CALLSIGN);
      return;
    }

    callsign = c;
    txt_callsign.setText(callsign + "_chase");

    SharedPreferences settings = getSharedPreferences(PREFS_NAME, 0);
    SharedPreferences.Editor editor = settings.edit();
    editor.putString("callsign", callsign);
    editor.commit();

    if (isBound && tsOutgoing != null) {
      try {
        Bundle b = new Bundle();
        b.putString("callsign", callsign);
        Message msg = Message.obtain(null, TrackerService.MSG_SET_CALLSIGN);
        msg.setData(b);
        msg.replyTo = tsIncoming;
        tsOutgoing.send(msg);
      } catch (RemoteException e) {
        e.printStackTrace();
      }
    }
  }
}

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