[英]How to save the streaming sensor data internally on Android?
干杯。 我對 Android 編程比較陌生。 我一直在嘗試實現一個應用程序,該應用程序讀取傳感器數據(加速度計 + 陀螺儀),然后通過單擊按鈕將其保存在內部。 我能夠成功地從傳感器獲得讀數。 但是,文件格式只保存一串數據,只顯示當前數據,之前的數據被覆蓋。 請參考這里的輸出。 因此,我需要一些幫助來解決這個問題。
在 MainActivity.java 中,我注冊了傳感器偵聽器:
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// TODO Auto-generated method stub
}
// Obtain the sensor data from the phone
boolean IsDataRequested = false;
@Override
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
if (IsDataRequested == true){
Log.d("Accelerometer", "Acc_X:" + event.values[0] + "Acc_Y:" + event.values[1] + "Acc_Z:" + event.values[2]);
AccXText.setText("AccX:" + event.values[0]);
AccYText.setText("AccY:" + event.values[1]);
AccZText.setText("AccZ:" + event.values[2]);
save(event);
}
}
if (sensor.getType() == Sensor.TYPE_GYROSCOPE) {
if (IsDataRequested == true) {
Log.d("Gyroscope", "Gyro_X:" + event.values[0] + "Gyro_Y:" + event.values[1] + "Gyro_Z:" + event.values[2]);
GyroXText.setText("GyroX:" + event.values[0]);
GyroYText.setText("GyroY:" + event.values[1]);
GyroZText.setText("GyroZ:" + event.values[2]);
save(event);
}
}
}
然后在同一個文件中,我創建了 save 方法:
public void save(SensorEvent v) {
float Acc_X = v.values[0];
float Acc_Y = v.values[1];
float Acc_Z = v.values[2];
float Gyro_X = v.values[0];
float Gyro_Y = v.values[1];
float Gyro_Z = v.values[2];
String accString = "Acc=" + "X:" + Acc_X + "Y:" + Acc_Y + "Z:" + Acc_Z;
String gyroString = "Gyro=" + "X:" + Gyro_X + "Y:" + Gyro_Y + "Z:" + Gyro_Z;
String FILENAME = "user";
FileOutputStream fos = null;
try {
fos = openFileOutput(FILENAME, Context.MODE_PRIVATE);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
try {
fos.write(accString.getBytes());
fos.write(gyroString.getBytes());
fos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
單擊按鈕開始和停止發送數據:
private OnClickListener myOnSensorsRequestClickHandler = new OnClickListener() {
@Override
public void onClick(View sensors) {
IsDataRequested = !IsDataRequested;
Log.d("Sensors", "Sensors Button Pressed");
}
};
我的目標是:
要連續保存傳感器數據流,直到單擊同一按鈕停止讀取數據,然后將其保存在一個文件中。
下次我開始和停止單擊按鈕時,它會添加另一個保存的文件,以便我可以在一個文件夾中保存多個文件。
非常感謝任何幫助或建議:)
我希望以下建議對您的以下要求有所幫助
private OnClickListener myOnSensorsRequestClickHandler = new OnClickListener() {
@Override
public void onClick(View sensors) {
IsDataRequested = !IsDataRequested;
Log.d("Sensors", "Sensors Button Pressed");
if(IsDataRequested)
{
//Create file name when start service button was clicked
FILENAME = "user"+new Date().getTime() + ".txt"; //Here FILENAME is a path of file in global variable
}
}};
boolean IsDataRequested = false;
@Override
public void onSensorChanged(SensorEvent event) {
Sensor sensor = event.sensor;
if (sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
if (IsDataRequested == true){
Log.d("Accelerometer", "Acc_X:" + event.values[0] + "Acc_Y:" + event.values[1] + "Acc_Z:" + event.values[2]);
AccXText.setText("AccX:" + event.values[0]);
AccYText.setText("AccY:" + event.values[1]);
AccZText.setText("AccZ:" + event.values[2]);
save(FILENAME, event);
}
else
{
}
}
if (sensor.getType() == Sensor.TYPE_GYROSCOPE) {
if (IsDataRequested == true) {
Log.d("Gyroscope", "Gyro_X:" + event.values[0] + "Gyro_Y:" + event.values[1] + "Gyro_Z:" + event.values[2]);
GyroXText.setText("GyroX:" + event.values[0]);
GyroYText.setText("GyroY:" + event.values[1]);
GyroZText.setText("GyroZ:" + event.values[2]);
save(FILENAME, event);
}
}
}
public void save(String FILENAME, SensorEvent v) {
float Acc_X = v.values[0];
float Acc_Y = v.values[1];
float Acc_Z = v.values[2];
float Gyro_X = v.values[0];
float Gyro_Y = v.values[1];
float Gyro_Z = v.values[2];
//Here used StringBuffer instead of string for append string data
StringBuffer accQyroData = "========";
accQyroData.append("Acc=" + "X:" + Acc_X + "Y:" + Acc_Y + "Z:" + Acc_Z"+"\n"+"Gyro=" + "X:" + Gyro_X + "Y:" + Gyro_Y + "Z:" + Gyro_Z);
accQyroData.append("========");
//Use Stream for java append to file when you are dealing with raw data, binary
appendUsingFileOutputStream(FILENAME, accQyroData);
}
/**
* Use Stream for java append to file when you are dealing with raw data, binary
* data
*
* @param data
*/
private static void appendUsingFileOutputStream(String fileName, String data) {
OutputStream os = null;
try {
// below true flag tells OutputStream to append
os = new FileOutputStream(new File(fileName), true);
os.write(data.getBytes(), 0, data.length());
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
os.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
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