Nel dicembre 2012 scrissi un articolo su un’app che mostrava l’elenco dei sensori in un dispositivo android, ora a distanza di circa un anno e mezzo le API 19 mettono a disposizione nuovi tipi di sensori e metodi e ho pensato di aggiornare l’app.
Le principali modifiche sono state fatte alla classe MySensor:
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package eu.lucazanini.sensorlist; import android.annotation.TargetApi; import android.content.Context; import android.hardware.Sensor; import android.os.Build; public class MySensor { private final static String MICRO = "μ"; private static final int SDK = Build.VERSION.SDK_INT; private final static String SQUARE = "²"; private Context context; private float maximumRange, minDelay, power, resolution; private String name, vendor; private int type, version, fifoMaxEventCount, fifoReservedEventCount; public MySensor(Sensor sensor, Context context) { this.name = sensor.getName(); this.vendor = sensor.getVendor(); this.type = sensor.getType(); this.version = sensor.getVersion(); this.maximumRange = sensor.getMaximumRange(); this.power = sensor.getPower(); this.resolution = sensor.getResolution(); if (SDK >= Build.VERSION_CODES.GINGERBREAD) MySensorAPI9(sensor); if (SDK >= Build.VERSION_CODES.KITKAT) MySensorAPI19(sensor); this.context = context; } public String getDelayUnits() { return MICRO + "s"; } public int getFifoMaxEventCount() { return fifoMaxEventCount; } public int getFifoReservedEventCount() { return fifoReservedEventCount; } public float getMaximumRange() { return maximumRange; } public float getMinDelay() { return minDelay; } public String getName() { return name; } public float getPower() { return power; } public String getPowerUnits() { return "mA"; } public float getResolution() { return resolution; } public int getType() { return type; } public String getTypeDescription() { String description = null; switch (type) { case Sensor.TYPE_ACCELEROMETER: description = context.getResources().getString( R.string.accelerometer); break; case Sensor.TYPE_AMBIENT_TEMPERATURE: description = context.getResources().getString( R.string.ambient_temperature); break; case Sensor.TYPE_GAME_ROTATION_VECTOR: description = context.getResources().getString( R.string.game_rotation); break; case Sensor.TYPE_GEOMAGNETIC_ROTATION_VECTOR: description = context.getResources().getString( R.string.geomagnetic_rotation); break; case Sensor.TYPE_GRAVITY: description = context.getResources().getString(R.string.gravity); break; case Sensor.TYPE_GYROSCOPE: description = context.getResources().getString(R.string.gyroscope); break; case Sensor.TYPE_GYROSCOPE_UNCALIBRATED: description = context.getResources().getString( R.string.uncalibrated_gyroscope); break; case Sensor.TYPE_LIGHT: description = context.getResources().getString(R.string.light); break; case Sensor.TYPE_LINEAR_ACCELERATION: description = context.getResources().getString( R.string.linear_acceleration); break; case Sensor.TYPE_MAGNETIC_FIELD: description = context.getResources().getString( R.string.magnetic_field); break; case Sensor.TYPE_MAGNETIC_FIELD_UNCALIBRATED: description = context.getResources().getString( R.string.uncalibrated_magnetic_field); break; case Sensor.TYPE_ORIENTATION: description = context.getResources() .getString(R.string.orientation); break; case Sensor.TYPE_PRESSURE: description = context.getResources().getString(R.string.pressure); break; case Sensor.TYPE_PROXIMITY: description = context.getResources().getString(R.string.proximity); break; case Sensor.TYPE_RELATIVE_HUMIDITY: description = context.getResources().getString( R.string.relative_humidity); break; case Sensor.TYPE_ROTATION_VECTOR: description = context.getResources().getString( R.string.rotation_vector); break; case Sensor.TYPE_SIGNIFICANT_MOTION: description = context.getResources().getString( R.string.significant_motion); break; case Sensor.TYPE_STEP_COUNTER: description = context.getResources().getString( R.string.step_counter); break; case Sensor.TYPE_STEP_DETECTOR: description = context.getResources().getString( R.string.step_detector); break; case Sensor.TYPE_TEMPERATURE: description = context.getResources() .getString(R.string.temperature); break; default: description = context.getResources().getString(R.string.unknown); break; } return description; } public String getUnits() { String units = null; switch (type) { case Sensor.TYPE_ACCELEROMETER: units = "m/s" + SQUARE; break; case Sensor.TYPE_AMBIENT_TEMPERATURE: units = "°C"; break; case Sensor.TYPE_GAME_ROTATION_VECTOR: units = ""; break; case Sensor.TYPE_GEOMAGNETIC_ROTATION_VECTOR: units = ""; break; case Sensor.TYPE_GRAVITY: units = "m/s" + SQUARE; break; case Sensor.TYPE_GYROSCOPE: units = "rad/s"; break; case Sensor.TYPE_LIGHT: units = "SI lux"; break; case Sensor.TYPE_LINEAR_ACCELERATION: units = "m/s" + SQUARE; break; case Sensor.TYPE_MAGNETIC_FIELD: units = MICRO + "T"; break; case Sensor.TYPE_MAGNETIC_FIELD_UNCALIBRATED: units = MICRO + "T"; break; case Sensor.TYPE_ORIENTATION: units = "°"; break; case Sensor.TYPE_PRESSURE: units = "hPa"; break; case Sensor.TYPE_PROXIMITY: units = "cm"; break; case Sensor.TYPE_RELATIVE_HUMIDITY: units = ""; break; case Sensor.TYPE_ROTATION_VECTOR: units = ""; break; case Sensor.TYPE_SIGNIFICANT_MOTION: units = ""; break; case Sensor.TYPE_STEP_COUNTER: units = ""; break; case Sensor.TYPE_STEP_DETECTOR: units = ""; break; case Sensor.TYPE_TEMPERATURE: units = "°C"; break; default: units = "unknown"; break; } return units; } public String getVendor() { return vendor; } public int getVersion() { return version; } public void setFifoMaxEventCount(int fifoMaxEventCount) { this.fifoMaxEventCount = fifoMaxEventCount; } public void setFifoReservedEventCount(int fifoReservedEventCount) { this.fifoReservedEventCount = fifoReservedEventCount; } public void setMaximumRange(float maximumRange) { this.maximumRange = maximumRange; } public void setMinDelay(float minDelay) { this.minDelay = minDelay; } public void setName(String name) { this.name = name; } public void setPower(float power) { this.power = power; } public void setResolution(float resolution) { this.resolution = resolution; } public void setType(int type) { this.type = type; } public void setVendor(String vendor) { this.vendor = vendor; } public void setVersion(int version) { this.version = version; } @Override public String toString() { return name; } @TargetApi(Build.VERSION_CODES.KITKAT) private void MySensorAPI19(Sensor sensor) { this.fifoMaxEventCount = sensor.getFifoMaxEventCount(); this.fifoReservedEventCount = sensor.getFifoReservedEventCount(); } @TargetApi(Build.VERSION_CODES.GINGERBREAD) private void MySensorAPI9(Sensor sensor) { this.minDelay = sensor.getMinDelay(); } } |
Anche il layout è stato modificato per mostrare i valori dei campi fifoMaxEventCount e fifoReservedEventCount, puoi scaricare tutti i file dell’app qui.
Questo è l’elenco dei nuovi tipi di sensori:
- TYPE_GAME_ROTATION_VECTOR
- TYPE_GEOMAGNETIC_ROTATION_VECTOR
- TYPE_GYROSCOPE_UNCALIBRATED
- TYPE_SIGNIFICANT_MOTION
- TYPE_STEP_COUNTER
- TYPE_STEP_DETECTOR
Trovo particolarmente interessante TYPE_GAME_ROTATION_VECTOR che è simile a TYPE_ROTATION_VECTOR perchè non utilizza il magnetometro ma solo l’accelerometro per restituire il vettore rotazione.
In questo modo non è possibile ottenere l’orientamento del dispositivo rispetto a un sistema di riferimento solidale con la Terra ma ha il vantaggio di essere più preciso, in altre parole sai di quanto il dispositivo è ruotato ma non puoi sapere l’orientamento rispetto al nord magnetico.
Sono stati aggiunti anche questi metodi nella classe Sensor con API 19:
- public int getFifoMaxEventCount()
- public int getFifoReservedEventCount()
che nel caso del Nexus 5 sono sempre diversi da zero tranne che per TYPE_SIGNIFICANT_MOTION, quindi la modalità batch è quasi sempre supportata.
