【发布时间】：2019-02-02 04:47:56
【问题描述】：
我为我最后一年的项目开发了一个 Android 应用程序。此应用程序必须从加速度计、陀螺仪和磁力计收集传感器智能手机信息，并将其保存到文件中。到目前为止，我已经完成了所有工作，但是现在我对传感器的采样率频率有些问题，我不知道如何处理。
我尝试使用可运行的方法来延迟 10ms 的加速度计和陀螺仪和其他可运行的方法来延迟 100ms 的磁力计。我这样做是因为通过近似值，我猜 ACC 和 GYR 的值每 10 毫秒改变一次。而对于 MAG，此值每 100 毫秒更改一次。
我从未使用过这种可运行的方法，我是初学者。我的代码有效，它创建了文件，但它有 0 个字节，这意味着我的代码没有正确输入 RUNNABLE 方法。我应该改变什么？
package localhost.dev.liverpoolsensorsfusion;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.Chronometer;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
public class RecordDataActivity extends AppCompatActivity implements SensorEventListener {
private SensorManager mSensorManager;
private Sensor mAccelerometer;
private Sensor mGyroscope;
private Sensor mMagnetometer;
Handler handler10;
Runnable runnable10;
Handler handler100;
Runnable runnable100;
CheckBox checkAcc;
CheckBox checkGyro;
CheckBox checkMagne;
TextView accX;
TextView accY;
TextView accZ;
TextView magneX;
TextView magneY;
TextView magneZ;
TextView gyroX;
TextView gyroY;
TextView gyroZ;
String FILENAME;
String content1;
String content2;
String content3;
FileOutputStream out;
Button startButton;
Button stopButton;
boolean startFlag = false;
EditText textData;
private Chronometer chronometer;
private boolean running_chronometer;
boolean isFirstSet = true;
private long currentTime;
private long startTime;
float[] acceleration = new float[3];
float[] gyroscope = new float[3];
float[] magnetometer = new float[3];
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_record_data);
// define sensors
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mGyroscope = mSensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
mMagnetometer = mSensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
// define text views
accX = (TextView) findViewById(R.id.raw_value_acc_x);
accY = (TextView) findViewById(R.id.raw_value_acc_y);
accZ = (TextView) findViewById(R.id.raw_value_acc_z);
magneX = (TextView) findViewById(R.id.raw_value_magne_x);
magneY = (TextView) findViewById(R.id.raw_value_magne_y);
magneZ = (TextView) findViewById(R.id.raw_value_magne_z);
gyroX = (TextView) findViewById(R.id.raw_value_gyro_x);
gyroY = (TextView) findViewById(R.id.raw_value_gyro_y);
gyroZ = (TextView) findViewById(R.id.raw_value_gyro_z);
// define checkboxes
checkAcc=(CheckBox)findViewById(R.id.checkBox);
checkGyro=(CheckBox)findViewById(R.id.checkBox2);
checkMagne=(CheckBox)findViewById(R.id.checkBox3);
// file name to be entered
textData = (EditText) findViewById(R.id.edit_text);
textData.setHint("Enter File Name here...");
// define chronometer
chronometer = findViewById(R.id.chronometer);
chronometer.setFormat("Recording: %s");
chronometer.setBase(SystemClock.elapsedRealtime());
// define start button
startButton = (Button) findViewById(R.id.button_record);
startButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// create file
FILENAME= textData.getText() + ".csv";
if(!checkAcc.isChecked() && !checkGyro.isChecked() && !checkMagne.isChecked()) {
Toast.makeText(getBaseContext(), "Please select at least one sensor!",
Toast.LENGTH_LONG).show();
}else if(FILENAME.equals(".csv")){
Toast.makeText(getBaseContext(), "Please insert a valid name for the file to be created!",
Toast.LENGTH_LONG).show();
}else {
// set the recording button ON
startFlag = true;
// make the chronometer run
if (!running_chronometer) {
chronometer.setBase(SystemClock.elapsedRealtime());
chronometer.start();
running_chronometer = true;
checkAcc.setClickable(false);
checkGyro.setClickable(false);
checkMagne.setClickable(false);
}
// add screen message to confirm that the app is recording
try{
textData.getText().clear();
Toast.makeText(getBaseContext(), "Start recording the data set", Toast.LENGTH_SHORT).show();
}catch(Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
// Turn off the record button
startButton.setClickable(false);
}
}
}); // starts button ends here
// define stop button
stopButton=(Button)findViewById(R.id.button_stop);
stopButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// set the recording button OFF
// Stop writing on file
startFlag = false;
isFirstSet = true;
// if there is no file created state the following message
if(FILENAME==null || FILENAME.equals(".csv")){
Toast.makeText(getBaseContext(), "There is no recording taken in this moment!",
Toast.LENGTH_LONG).show();
}else{
// stop the chronometer
chronometer.stop();
running_chronometer = false;
checkAcc.setClickable(true);
checkGyro.setClickable(true);
checkMagne.setClickable(true);
// add screen message to confirm that the app has saved the data set
try{
Toast.makeText(getBaseContext(), "Saved to " + getFilesDir() + "/" + FILENAME,
Toast.LENGTH_LONG).show();
}catch(Exception e) {
Toast.makeText(getBaseContext(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
// Turn back on the Record button
startButton.setClickable(true);
}
}); // stop button ends here
} // onCreate class ends here
@Override
public final void onAccuracyChanged(Sensor sensor, int accuracy) {
// Do something here if sensor accuracy changes.
}
@Override
public final void onSensorChanged(SensorEvent event) {
// when recording is ON do this
if (startFlag) {
if (checkAcc.isChecked() && event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
acceleration[0] = event.values[0];
acceleration[1] = event.values[1];
acceleration[2] = event.values[2];
}
if (checkGyro.isChecked() && event.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
gyroscope[0] = event.values[0];
gyroscope[1] = event.values[1];
gyroscope[2] = event.values[2];
}
if (checkMagne.isChecked() && event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
magnetometer[0] = event.values[0];
magnetometer[1] = event.values[1];
magnetometer[2] = event.values[2];
}
// initialise the content that will be written in the file
if (isFirstSet) {
startTime = System.currentTimeMillis();
isFirstSet = false;
}
currentTime = System.currentTimeMillis();
content1 = (currentTime - startTime) + "," + "ACC" + "," + acceleration[0] + "," + acceleration[1] + "," + acceleration[2] + "\n";
content2 = (currentTime - startTime) + "," + "GYR" + "," + gyroscope[0] + "," + gyroscope[1] + "," + gyroscope[2] + "\n";
content3 = (currentTime - startTime) + "," + "MAG" + "," + magnetometer[0] + "," +magnetometer[1] + "," + magnetometer[2] + "\n";
// as long the recording is ON
for (int i = 0; i < 1; i++){
try {
// create the file
out = openFileOutput(FILENAME, Context.MODE_APPEND);
} catch (FileNotFoundException e) {
e.printStackTrace();
}
// write to the file
if (checkAcc.isChecked() && checkGyro.isChecked() && checkMagne.isChecked()) {
if (startFlag) {
handler10 = new Handler();
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateAccText();
updateGyroText();
try {
out.write(content1.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
try {
out.write(content2.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
handler100 = new Handler();
runnable100 = new Runnable() {
@Override
public void run() {
handler100.postDelayed(this, 100);
updateMagneText();
try {
out.write(content3.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkAcc.isChecked() && checkGyro.isChecked()) {
if (startFlag) {
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateAccText();
updateGyroText();
try {
out.write(content1.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
try {
out.write(content2.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkAcc.isChecked() && checkMagne.isChecked()) {
if (startFlag) {
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateAccText();
try {
out.write(content1.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
runnable100 = new Runnable() {
@Override
public void run() {
handler100.postDelayed(this, 100);
updateMagneText();
try {
out.write(content3.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkGyro.isChecked() && checkMagne.isChecked()) {
if (startFlag) {
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateGyroText();
try {
out.write(content2.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
runnable100 = new Runnable() {
@Override
public void run() {
handler100.postDelayed(this, 100);
updateMagneText();
try {
out.write(content3.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkAcc.isChecked()) {
if (startFlag) {
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateAccText();
try {
out.write(content1.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkGyro.isChecked()) {
if (startFlag) {
runnable10 = new Runnable() {
@Override
public void run() {
handler10.postDelayed(this, 10);
updateGyroText();
try {
out.write(content2.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
} else if (checkMagne.isChecked()) {
if (startFlag) {
runnable100 = new Runnable() {
@Override
public void run() {
handler100.postDelayed(this, 100);
updateMagneText();
try {
out.write(content3.getBytes());
} catch (IOException e) {
e.printStackTrace();
}
}
};
}
}
} // for loop end
}
}
@Override
protected void onResume() {
super.onResume();
mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(this, mGyroscope, SensorManager.SENSOR_DELAY_NORMAL);
mSensorManager.registerListener(this, mMagnetometer, SensorManager.SENSOR_DELAY_NORMAL);
}
@Override
protected void onPause() {
super.onPause();
mSensorManager.unregisterListener(this);
}
protected void updateAccText(){
// Update the gyroscope data
accX.setText(String.format("%.6f", acceleration[0]));
accY.setText(String.format("%.6f", acceleration[1]));
accZ.setText(String.format("%.6f", acceleration[2]));
}
protected void updateGyroText(){
// Update the gyroscope data
gyroX.setText(String.format("%.6f", gyroscope[0]));
gyroY.setText(String.format("%.6f", gyroscope[1]));
gyroZ.setText(String.format("%.6f", gyroscope[2]));
}
protected void updateMagneText(){
// Update the gyroscope data
magneX.setText(String.format("%.6f", magnetometer[0]));
magneY.setText(String.format("%.6f", magnetometer[1]));
magneZ.setText(String.format("%.6f", magnetometer[2]));
}
}
当我按下记录（开始）按钮时，我希望创建一个 .csv 文件，该文件在更改之前保存每个已检查（选择）传感器的每个值，依此类推，直到用户按下保存（停止）按钮。
【问题讨论】：
标签： java android-studio runnable sensors