I am making an app that records the readings from the accelerometer. When I enter TYPE_ACCELEROMETER it can perfectly record the raw accelerometer data. However when I enter TYPE_LINEAR_ACCELERATION it fails to return any values. The app doesn't give me an error or quit. I think that I must be either using a device that doesn't support TYPE_LINEAR_ACCELERATION or I do not have all the necessary permissions in my manifest.
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.layout);
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION);
currentX = (TextView) findViewById(R.id.currentX);
currentY = (TextView) findViewById(R.id.currentY);
currentZ = (TextView) findViewById(R.id.currentZ);
}
public void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
currentX.setText(Float.toString(x));
currentY.setText(Float.toString(y));
currentZ.setText(Float.toString(z));
try {
writer.write(x + "," + y + "," + z + "\n");
} catch (IOException e) {
Log.e(LOG_TAG2, "failed");
}
}
};
public void Recordbutton(View view) {
if (recordbuttonstatus) {
playBtn.setEnabled(true);
recordbuttonstatus = false;
startBtn.setText(getString(R.string.stoprecording));
sensorManager.registerListener(accelListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
sensorManager.registerListener(accelListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
Thread accelerometerrecord = new Thread(new Runnable() {
@Override
public void run(){
File accoutputFile = new File(Environment.getExternalStorageDirectory(), "accelerometervals.txt");
try {
accoutputFile.createNewFile();
} catch (IOException e){
e.printStackTrace();
}
try {
writer = new FileWriter(accoutputFile, false); /*When false, the file is overwritten, when true, the file is appended.*/
} catch (IOException e) {
Log.e(LOG_TAG2, "failed");
}
}
});
accelerometerrecord.start();
} else {
startBtn.setText(getString(R.string.newrecording));
recordbuttonstatus = true;
sensorManager.unregisterListener(accelListener);
}
}
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(accelListener);
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
Log.e(LOG_TAG2, "failed");
}
}
}
public void onStop() {
super.onStop();
sensorManager.unregisterListener(accelListener);
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
Log.e(LOG_TAG2, "failed");
}
}
}
