JavaME: JSR-256 (Mobile Sensor API): charger_state
http://www.developer.nokia.com/Community/Wiki/How_to_use_sensors_in_Java_ME
| Цитата |
The code sample below shows, how to search a sensor of desired quantity. The method also gets the sensor URL and returns the correct SensorConnection to it.
| Код |
/**
* Searches sensors of desired quantity and if found, returns a
* SensorConnection opened to it.
* @param quantity the sensor quantity, for example "acceleration", "battery_charge",
* "charger_state" and "network_field_intensity"
* @return SensorConnection, which has been opened to a sensor matching the criteria
*/
private SensorConnection openSensor(String quantity) {
infos = SensorManager.findSensors(quantity, null);
if (infos.length==0) return null;
String sensor_url = infos[0].getUrl();
try {
return (SensorConnection)Connector.open(sensor_url);
}catch (IOException ioe) {
ioe.printStackTrace();
return null;
}
}
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The following method shows, how to set DataListener for listening sensor values from the three sensors:
| Код |
/**
* Initializes (opens) the sensor connections and sets the DataListener.
* Takes also care of removing the DataListeners and closing the connections.
*/
private synchronized void initSensors() {
batterySensor = openSensor(BATTERY);
if (batterySensor == null) return;
chargeSensor = openSensor(CHARGER);
if (chargeSensor == null) return;
networkSensor = openSensor(NETWORK);
if (networkSensor == null) return;
try {
batterySensor.setDataListener(this, BUFFER_SIZE);
chargeSensor.setDataListener(this, BUFFER_SIZE);
networkSensor.setDataListener(this, BUFFER_SIZE);
while(!isStopped){
try{
wait();
}catch(InterruptedException ie){}
}
batterySensor.removeDataListener();
chargeSensor.removeDataListener();
networkSensor.removeDataListener();
}catch (IllegalMonitorStateException imse) {
imse.printStackTrace();
}catch (IllegalArgumentException iae) {
iae.printStackTrace();
}
try {
batterySensor.close();
chargeSensor.close();
networkSensor.close();
} catch(IOException ioe){
ioe.printStackTrace();
}
if (isStopped) {
batterySensor = null;
chargeSensor = null;
networkSensor = null;
}
}
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Finally, the dataReceived() method is implemented for getting the sensor values. The method creates the Strings for showing the sensor values properly formatted.
| Код |
/**
* Notification of the received sensor data.
* @param sensor - SensorConnection, the origin of the received data
* @param data - the received sensor data
* @param isDataLost - true if some data has been lost
*/
public void dataReceived(SensorConnection sensor, Data[] data, boolean isDataLost) {
sensorString = sensor.getSensorInfo().getQuantity();
int values[] = data[0].getIntValues();
if (sensorString.equals(BATTERY)) {
batteryString = "" + values[0] + "%";
}
else if (sensorString.equals(CHARGER)) {
int value = values[0];
if (value == 0) chargeString = "not plugged in";
else if (value == 1) chargeString = "plugged in";
}
else if (sensorString.equals(NETWORK)) {
networkString = "" + values[0] + "%";
}
repaint();
}
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http://www.developer.nokia.com/Community/Wiki/images/7/7d/SensorTest2.zip?20090522114827 |