Android Open Source - laser Main Activity

• Back to Development/socket  ↑

From Project

Back to project page laser.

License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Draws UI interface:/*  w w w  .  jav  a2  s . co  m*/
 *   EditText: IP and Port
 *   SeekBar: Mouse speed
 *   Buttons: Start and Stop
 *   TextViews: Coordinates X Y Z
 */

package com.rmgoncalo.laser;

import java.net.MalformedURLException;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity implements SensorEventListener,
    OnClickListener, OnSeekBarChangeListener {

  private final static String tag = "Laser-MainActivity";
  private final static String HTTP_PREFIX = "http://";

  private Button btnStart, btnStop;
  private TextView xAxis, yAxis, zAxis;
  private EditText ipText;
  private EditText portText;
  private SeekBar speedBar;
  private int speed = 0;

  private boolean started = false;
  private SensorManager mSensorManager;
  private Sensor mAccelerometer;
  private Connection connection;

  // private int count = 0;
  private final float alpha = (float) 0.8; // constant for our filter below
  private float[] gravity = { 0, 0, 0 };

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

    btnStart = (Button) findViewById(R.id.startButton);
    btnStop = (Button) findViewById(R.id.stopButton);

    ipText = (EditText) findViewById(R.id.ipEditText);
    portText = (EditText) findViewById(R.id.portEditText);
    speedBar = (SeekBar) findViewById(R.id.seekBar);

    xAxis = (TextView) findViewById(R.id.x_axis);
    yAxis = (TextView) findViewById(R.id.y_axis);
    zAxis = (TextView) findViewById(R.id.z_axis);

    btnStart.setOnClickListener(this);
    btnStop.setOnClickListener(this);
    speedBar.setOnSeekBarChangeListener(this);

    btnStart.setEnabled(true);
    btnStop.setEnabled(false);

    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mAccelerometer = mSensorManager
        .getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
  }

  @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;
  }

  /*
   * onResume register sensor
   */
  @Override
  protected void onResume() {
    Log.d(tag, "onResume");
    super.onResume();
    if (started) {
      super.onResume();
      mSensorManager.registerListener(this, mAccelerometer,
          SensorManager.SENSOR_DELAY_NORMAL);
    }
  }

  /*
   * onPause unregister sensor
   */
  @Override
  protected void onPause() {
    Log.d(tag, "onPause");
    super.onPause();
    if (started) {
      mSensorManager.unregisterListener(this);
    }
  }

  /*
   * Interface SensorEventListener methods:
   * 
   * onSensorChanged onAccuracyChanged
   * 
   * Sensor
   */
  
  /*
   * when 'start' button is clicked, sensor sends values 'x y z' 
   * 'alpha' and 'gravity' variables are used to implement a low-pass filter
   * (http://developer.android.com/guide/topics/sensors/sensors_motion.html)
   */
  
  // TODO: convert these values into coherent coordinates to send to the remove server
  @Override
  public void onSensorChanged(SensorEvent event) {

    if (started) {
      // Isolate the force of gravity with the low-pass filter.
      gravity[0] = alpha * gravity[0] + (1 - alpha) * event.values[0];
      gravity[1] = alpha * gravity[1] + (1 - alpha) * event.values[1];
      gravity[2] = alpha * gravity[2] + (1 - alpha) * event.values[2];

      // Remove the gravity contribution with the high-pass filter.
      // speed: mouse sensitivity
      float x = (event.values[0] - gravity[0]) * speed;
      float y = (event.values[1] - gravity[1]) * speed;
      float z = (event.values[2] - gravity[2]) * speed;

      // count++;
      // Log.d(tag, "count: " + count);

      // use count to decrease frequency of points being sent
      // if (count % 3 == 0) {

      xAxis.setText(String.valueOf(x));
      yAxis.setText(String.valueOf(y));
      zAxis.setText(String.valueOf(z));

      // Create new point
      Point p = new Point(x, y, z);

      // send point to server
      connection.sendPosition(p.toJSON());
      // }
    }

  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {

  }

  /*
   * Interface OnSeekBarChangeListener methods:
   * 
   * onProgressChanged onStartTrackingTouch onStopTrackingTouch
   * 
   * SeekBar
   */

  // update speed value [0-20]
  // max value (20) is defined on activity_main.xml (android:max="20")
  @Override
  public void onProgressChanged(SeekBar seekBar, int progress,
      boolean fromTouch) {
    speed = progress;
    // Log.d(tag, "speed: " + progress);
  }

  @Override
  public void onStartTrackingTouch(SeekBar seekBar) {
    // Log.d(tag, "onStartTrackingTouch");
  }

  @Override
  public void onStopTrackingTouch(SeekBar seekBar) {
    // Log.d(tag, speed + "/" + seekBar.getMax());
    Toast.makeText(this, speed + "/" + seekBar.getMax(), Toast.LENGTH_SHORT)
        .show();
  }

  // after click 'start' button, hide keyboard
  private void hideKeyboard(){
    InputMethodManager inputManager = (InputMethodManager)
                getSystemService(Context.INPUT_METHOD_SERVICE); 

    inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),
                   InputMethodManager.HIDE_NOT_ALWAYS);
  }
  
  /*
   * Interface OnClickListener methods:
   * 
   * onClick
   * 
   * Button
   * 
   * use switch to distinguish between 'start' and 'stop' buttons
   * 
   */
  
  @Override
  public void onClick(View v) {
    switch (v.getId()) {

    case R.id.startButton:
      if (ipText.length() == 0 || portText.length() == 0) {
        Toast.makeText(this, "Insert IP and Port", Toast.LENGTH_SHORT)
            .show();
        break;
      }

      if (speed == 0) {
        Toast.makeText(this, "Increase Mouse Speed", Toast.LENGTH_SHORT)
            .show();
        break;
      }

      // TODO: Check if ip and port are correct strings
      String ip = ipText.getText().toString();
      String port = portText.getText().toString();

      // append HTTP_PREFIX to ip
      String ip_final = new StringBuilder(HTTP_PREFIX).append(ip)
          .toString();

      // connect socket client
      // TODO: use worker thread to run socket client
      // and handle UI updates with Handler
      connection = new Connection(ip_final, port);
      try {
        connection.init();
      } catch (MalformedURLException e) {
        e.printStackTrace();
      }

      hideKeyboard();
      
      btnStart.setEnabled(false);
      btnStop.setEnabled(true);
      speedBar.setEnabled(false);
      started = true;
      
      mSensorManager.registerListener(this, mAccelerometer,
          SensorManager.SENSOR_DELAY_NORMAL);

      Toast.makeText(
          this,
          "Sending data to " + ip_final + ":" + port
              + " with speed of " + speed, Toast.LENGTH_SHORT)
          .show();
      break;

      // TODO: disconnect the socket
    case R.id.stopButton:
      btnStart.setEnabled(true);
      btnStop.setEnabled(false);
      speedBar.setEnabled(true);
      started = false;
      mSensorManager.unregisterListener(this);
      break;
    default:
      break;
    }
  }
}

Java Source Code List

• Back to Development/socket  ↑