Develop Reference

I want to create touch event on screen in android, as magnetic field change

I want to create a service which will run in background and create touch event on screen in android, as magnetic field change for my virtual reality glasses.
this my code
public void onSensorChanged(SensorEvent sensorEvent) {
synchronized (this) {
if (sensorEvent.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
magneticX.setText( Float.toString( sensorEvent.values[0]));
magneticY.setText( Float.toString( sensorEvent.values[1]));
magneticZ.setText( Float.toString( sensorEvent.values[2]));
if(sensorEvent.values[0]>100){
// Long time = System.currentTimeMillis();
// View v = getWindow().getDecorView().getRootView();
// MotionEvent event = MotionEvent.obtain(time,time,0,100f ,100f, 0);
// v.dispatchTouchEvent(event);
Process process = null;
try {
process = Runtime.getRuntime().exec("adb shell input tap 100 100 ");
((TextView)findViewById(R.id.valMag_Msg)).setText("Magnet on Left lower corner");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
BufferedReader bufferedReader = new BufferedReader(
new InputStreamReader(process.getInputStream()));
}else{
((TextView)findViewById(R.id.valMag_Msg)).setText("Normal");;
}
}
}
}

How to sync head movement with Google Cardboard in Android

I need to get head movements and according to that head turns (rotations). I need to do some work there. This is in case of inserting device in google cardboard.
I have searched the internet but I found no proper information. Please help me out here.
Thanks in advance.

Use Sensor class for this as shown below..
SensorEventListener mSensorListener = new SensorEventListener() {
#Override
public void onAccuracyChanged(Sensor arg0, int arg1) {
}
#Override
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
if (event.values != null && event.values.length > 1) {
accelDataOld = rawAccelData;
rawAccelData = event.values[1];
tweenStep = (rawAccelData - accelData) / TWEEN_TIMING;
}
} else if (sensor.getType() == Sensor.TYPE_GYROSCOPE) {
if (event.values != null && event.values.length > 1) {
rawGyroData += event.values[0];
}
}
}
};

Azimuth coming back as 0

I am trying to get the azimuth of the users phone when they take a picture. However, when I put the azimuth to the screen just for debugging purposes currently, it always comes back at 0.0. I am new to using Sensors so I am trying to figure this out. My code is
private void dispatchTakePictureIntent() {
double latitude, longitude;
if (mGpsLocationTracker.canGetLocation()) {
latitude = mGpsLocationTracker.getLatitude();
longitude = mGpsLocationTracker.getLongitude();
} else {
latitude = 0;
longitude = 0;
}
Intent takePictureIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
if (takePictureIntent.resolveActivity(getPackageManager()) != null) {
startActivityForResult(takePictureIntent, REQUEST_IMAGE_CAPTURE);
}
Toast.makeText(this, "" + latitude + ", " + longitude, Toast.LENGTH_SHORT).show();
getDirection ();
Toast.makeText(this, Float.toString(degree), Toast.LENGTH_SHORT).show();
}
public void getDirection() {
SensorManager mySensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE);
List<Sensor> mySensors = mySensorManager.getSensorList(Sensor.TYPE_ORIENTATION);
if(mySensors.size() > 0){
mySensorManager.registerListener(mySensorEventListener, mySensors.get(0), SensorManager.SENSOR_DELAY_UI);
}
}
/*
DOES NOT WORK. NEED TO FIX
*/
private SensorEventListener mySensorEventListener = new SensorEventListener(){
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
#Override
public void onSensorChanged(SensorEvent event) {
// TODO Auto-generated method stub
float radianValue = Math.round(event.values[0]);
degree = (float) Math.toDegrees(radianValue);
if (degree < 0.0f) {
degree += 360.0f;
}
}
};
public void takePicture (View view) {
dispatchTakePictureIntent();
}
Can anyone help me with what I'm doing wrong

Doesn't the orientation sensor return the angle in degrees? You're assuming radians and converting to degrees. Given that though, it still should't give you 0.

TYPE_ORIENTATION is depreciated and does not give the correct result
if the device is not flat. You need to use TYPE_ACCELEROMETER and TYPE_MAGNETIC_FIELD to obtain the rotation matrix and then call remapCoordinateSystem before calling getOrientation.

How to display volume slider with Chromecast icon when not using remoteMediaPlayer

I am trying to implement the volume slider while casting and show the cast icon in the slider like in the Youtube app : http://imgur.com/kVxoKbM.
As of now I have overridden the dispatchKeyEvent function my activity, as explained in the cast developers documentation (shown in the code snipped below), which allows me to control the volume of the connected Chromecast perfectly. But on the device, it doesn't even show a slider at all.
#Override
public boolean dispatchKeyEvent(KeyEvent event) {
int action = event.getAction();
int keyCode = event.getKeyCode();
switch (keyCode) {
case KeyEvent.KEYCODE_VOLUME_UP:
if (action == KeyEvent.ACTION_DOWN) {
if (mApiClient != null) {
double currentVolume = Cast.CastApi.getVolume(mApiClient);
if (currentVolume < 1.0) {
try {
Cast.CastApi.setVolume(mApiClient,
Math.min(currentVolume + VOLUME_INCREMENT, 1.0));
} catch (Exception e) {
Log.e(TAG, "unable to set volume", e);
}
}
} else {
Log.e(TAG, "dispatchKeyEvent - volume up");
}
}
return true;
case KeyEvent.KEYCODE_VOLUME_DOWN:
if (action == KeyEvent.ACTION_DOWN) {
if (mApiClient != null) {
double currentVolume = Cast.CastApi.getVolume(mApiClient);
if (currentVolume > 0.0) {
try {
Cast.CastApi.setVolume(mApiClient,
Math.max(currentVolume - VOLUME_INCREMENT, 0.0));
} catch (Exception e) {
Log.e(TAG, "unable to set volume", e);
}
}
} else {
Log.e(TAG, "dispatchKeyEvent - volume down");
}
}
return true;
default:
return super.dispatchKeyEvent(event);
}
}
I am not using the remoteMediaPlayer. So how can I implement a volume slider while controlling the connected Chromecast volume?

Trying to collect wifi data like Metal Gear Solid Portable Ops

I'm trying to create an app that scans for wifi. When the player does something in the game, it "consumes" the strongest wifi signal. That signal should no longer be detected on the next scan.
Anyone who's played Metal Gear Solid Portable ops would know what I mean.
I tried to do this by creating a List of Wireless Signals that have already been used by the player and can no longer be detected again. The problem is that after scanning the best network, I scan again and it still displays the same network instead of ignoring it.
public void onClick(View arg0) {
if (arg0.getId() == R.id.bStart) {
ActivityLoader.loadMain(this);
}
if (arg0.getId() == R.id.bScan) {
Toast.makeText(this, "Searching....", Toast.LENGTH_LONG).show();
for (ScanResult selectedSpot : networkList) {
{
if (firstSignal == null || checkIfNotUsed(firstSignal)) {
firstSignal = selectedSpot;
usedNetworks.add(firstSignal.SSID);
break;
}
}
}
}
if (firstSignal != null) {
Toast.makeText(
this,
"Found Food and Ammo at the " + firstSignal.SSID
+ " store.", Toast.LENGTH_LONG).show();
// textStatus.setText(usedNetworks.toString());
textStatus.setText(networkList.toString());
} else {
Toast.makeText(this, "Found nothing!!!", Toast.LENGTH_LONG).show();
}
}
private boolean checkIfNotUsed(ScanResult selectedSpot) {
// TODO Auto-generated method stub
boolean flag = true;
if (usedNetworks.isEmpty()) {
flag = true;
} else {
for (String used : usedNetworks) {
if (selectedSpot.SSID.equals(used)) {
flag = false;
break;
}
}
}
return flag;
}