JSR 256電池事件

Question

如何使用JSR 256將電源線從電源插座中拔出時能夠檢測到？

Answer 1

從快看看JSR規格：

（你可能想看看代碼示例，從最新的JavaME SDK，索尼愛立信開發者網站規範的附錄d本身，然後谷歌）

像往常一樣，我會擔心在JSR的不同實現碎片化，但是這是我的第一個想法：

import javax.microedition.sensor.*; 

SensorInfo[] powerSensorInfoArray = SensorManager.findSensors("power","ambient"); 

//let's assume there is one SensorInfo in the array. 

//open a connection to the sensor. 

SensorConnection connection = (SensorConnection)Connector.open(powerSensorInfoArray[0].getUrl(), Connector.READ); 

// add a DataListener to the connection 

connection.setDataListener(new MyDataListener(), 1); 

// implement the data listener 

public class MyDataListener implements DataListener { 

public void dataReceived(SensorConnection aSensor, Data[] aDataArray, boolean isDataLost) { 

//let's assume there is only one channel for the sensor and no data was lost. 

// figure out what kind of data the channel provides. 

int dataType = aDataArray[0].getChannelInfo().getDataType(); 

//now, I suggest you switch on dataType and print the value on the screen 

// experimentation on the JSR256 implementation you're targetting seems to be 

// the only way to figure out out power data is formatted and what values mean. 

//only one of the following 3 lines will work: 

double[] valueArray = aDataArray[0].getDoubleValues(); 
int[] valueArray = aDataArray[0].getIntValues(); 
Object[] valueArray = aDataArray[0].getObjectValues(); 

// let's assume one value in the valueArray 

String valueToPrint = "" + valueArray[0]; 

// see what happens with that and you plug or unplug the power supply cable. 

} 

} 

你需要添加javax.microedition.io.Connector.sensor到你的MIDlet權限。

------- ------編輯從索尼愛立信的Satio手機JSR-256實現（S60第五版）

文檔：

電池電量傳感器以下特點：

• 數量：battery_charge

• 語境類型：設備

• URL：傳感器：battery_charge; contextType =裝置;模型=索尼愛立信

• 頻道：（指數：名稱，區域單元）

• 0：battery_charge，0-100，百分比

• 1：charger_state，0-1，布爾

Answer 2

你會添加javax.microedition.io.Connector.sensor到工程中的的應用程序描述符的API權限選項卡t屬性。