如何始终记住每个传感器的最新值并将其写入文件？

Question

我为我的最后一年的项目开发了一个Android应用程序。此应用必须从加速度计，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一些疑问，我不知道该如何处理。

我试图使用可运行方法将加速度计和陀螺仪延迟10毫秒，而其他可运行方法将磁力计延迟100毫秒。我这样做是因为我估计ACC和GYR的值每10毫秒变化一次。而对于MAG，此值每100毫秒更改一次。

我从来没有使用过这种可运行的方法，我是一个初学者。我的代码有效，它创建了文件，但是它有0个字节，这意味着我的代码没有正确输入到RUNNABLE方法中。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检查（选定）传感器中的每个值，依此类推，直到用户按下“保存”（停止）按钮。

Answer 1

您创建了一个可运行的代码块，但是从不执行它。创建可运行对象并希望将其设置为运行时调用此函数：

new Thread(myRunnable).start();

Answer 2

最后，我设法做到了。 我每5毫秒保存一次GYR值，每100毫秒保存一次MAG值，如果保存的值仍与新值相等，则等待它们不同时写入。我认为这是一个很好的例子。

我将把代码放在这里，也许可以帮助其他人：

Java：

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;
    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 isFirstSet = true;
    boolean startFlag = false;
    EditText textData;
    private Chronometer chronometer;
    private boolean running_chronometer;
    private long currentTime;
    private long startTime;

    float[] acceleration = new float[3];
    float[] gyroscope = new float[3];
    float[] magnetometer = new float[3];

    float[] new_gyroscope = new float[3];
    float[] new_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;
                // 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) {
        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];
            }
            // when recording is ON do this
            // 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() && startFlag) {
                    updateAccText();
                    writeAcc();
                    updateGyroText();
                    HandleGyr();
                    if(new_gyroscope[0]==gyroscope[0] && new_gyroscope[1]== gyroscope[1] && new_gyroscope[2]==gyroscope[2]){
                        writeGyr();
                    }
                    updateMagneText();
                    HandleMag();
                    if(new_magnetometer[0]==magnetometer[0] && new_magnetometer[1] == magnetometer[1] && new_magnetometer[1] == magnetometer[1]){
                        writeMag();
                    }
                } else if (checkAcc.isChecked() && checkGyro.isChecked() && startFlag) {
                    updateAccText();
                    updateGyroText();
                    writeAcc();
                    HandleGyr();
                    if(new_gyroscope[0]==gyroscope[0] && new_gyroscope[1]== gyroscope[1] && new_gyroscope[2]==gyroscope[2]){
                        writeGyr();
                    }
                } else if (checkAcc.isChecked() && checkMagne.isChecked() && startFlag) {
                    updateAccText();
                    updateMagneText();
                    writeAcc();
                    HandleMag();
                    if(new_magnetometer[0]==magnetometer[0] && new_magnetometer[1] == magnetometer[1] && new_magnetometer[1] == magnetometer[1]){
                        writeMag();
                    }
                } else if (checkGyro.isChecked() && checkMagne.isChecked() && startFlag) {
                    updateGyroText();
                    updateMagneText();
                    HandleGyr();
                    HandleMag();
                    if(new_gyroscope[0]==gyroscope[0] && new_gyroscope[1]== gyroscope[1] && new_gyroscope[2]==gyroscope[2]){
                        writeGyr();
                    }
                    if(new_magnetometer[0]==magnetometer[0] && new_magnetometer[1] == magnetometer[1] && new_magnetometer[1] == magnetometer[1]){
                        writeMag();
                    }
                } else if (checkAcc.isChecked() && startFlag) {
                    updateAccText();
                    writeAcc();
                } else if (checkGyro.isChecked() && startFlag) {
                    updateGyroText();
                    writeGyr();
                } else if (checkMagne.isChecked()) {
                    updateAccText();
                    writeAcc();
                }
            } // 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]));
    }
    // Adjust sampling rate for Gyroscope
    public void HandleGyr(){
        Handler handlerGyroscope = new Handler();
        handlerGyroscope.postDelayed(new Runnable() {
            @Override
            public void run() {
                new_gyroscope[0]=gyroscope[0];
                new_gyroscope[1]=gyroscope[1];
                new_gyroscope[2]=gyroscope[2];
            }
        }, 5);
    }
    // Adjust sampling rate for Magnetometer
    public void HandleMag(){
        Handler handlerMagnetometer = new Handler();
        handlerMagnetometer.postDelayed(new Runnable() {
            @Override
            public void run() {
                new_magnetometer[0]=magnetometer[0];
                new_magnetometer[1]=magnetometer[1];
                new_magnetometer[2]=magnetometer[2];
            }
        }, 100);
    }

    public void writeAcc(){
        try {
            out.write(content1.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void writeGyr(){
        try {
            out.write(content2.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void writeMag(){
        try {
            out.write(content3.getBytes());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

XML：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".RecordDataActivity">

    <TextView
        android:id="@+id/raw_label_acc_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/checkBox"
        android:layout_marginStart="133dp"
        android:paddingRight="20dp"
        android:text="X:"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_label_acc_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_below="@+id/raw_label_acc_x"
        android:paddingRight="20dp"
        android:text="Y:"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_label_acc_z"
        android:layout_width="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/raw_label_acc_y"
        android:paddingRight="20dp"
        android:text="Z:"
        android:textColor="@color/graphZ" />

    <TextView
        android:id="@+id/raw_value_acc_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_acc_x"
        android:layout_alignBottom="@+id/raw_label_acc_x"
        android:layout_toEndOf="@+id/raw_label_acc_x"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_value_acc_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_acc_y"
        android:layout_alignBottom="@+id/raw_label_acc_y"
        android:layout_toEndOf="@+id/raw_label_acc_y"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_value_acc_z"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_acc_z"
        android:layout_alignBottom="@+id/raw_label_acc_z"
        android:layout_toEndOf="@+id/raw_label_acc_z"
        android:textColor="@color/graphZ" />


    <TextView
        android:id="@+id/raw_label_gyro_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/checkBox2"
        android:layout_marginStart="133dp"
        android:paddingRight="20dp"
        android:text="X:"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_label_gyro_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_below="@+id/raw_label_gyro_x"
        android:paddingRight="20dp"
        android:text="Y:"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_label_gyro_z"
        android:layout_width="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/raw_label_gyro_y"
        android:paddingRight="20dp"
        android:text="Z:"
        android:textColor="@color/graphZ" />

    <TextView
        android:id="@+id/raw_value_gyro_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_gyro_x"
        android:layout_alignBottom="@+id/raw_label_gyro_x"
        android:layout_toEndOf="@+id/raw_label_gyro_x"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_value_gyro_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_gyro_y"
        android:layout_alignBottom="@+id/raw_label_gyro_y"
        android:layout_toEndOf="@+id/raw_label_gyro_y"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_value_gyro_z"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_gyro_z"
        android:layout_alignBottom="@+id/raw_label_gyro_z"
        android:layout_toEndOf="@+id/raw_label_gyro_z"
        android:textColor="@color/graphZ" />

    <TextView
        android:id="@+id/raw_label_magne_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/checkBox3"
        android:layout_marginStart="133dp"
        android:paddingRight="20dp"
        android:text="X:"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_label_magne_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_below="@+id/raw_label_magne_x"
        android:paddingRight="20dp"
        android:text="Y:"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_label_magne_z"
        android:layout_width="wrap_content"
        android:layout_marginStart="133dp"
        android:layout_height="wrap_content"
        android:layout_below="@+id/raw_label_magne_y"
        android:paddingRight="20dp"
        android:text="Z:"
        android:textColor="@color/graphZ" />

    <TextView
        android:id="@+id/raw_value_magne_x"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_magne_x"
        android:layout_alignBottom="@+id/raw_label_magne_x"
        android:layout_toEndOf="@+id/raw_label_magne_x"
        android:textColor="@color/graphX" />

    <TextView
        android:id="@+id/raw_value_magne_y"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_magne_y"
        android:layout_alignBottom="@+id/raw_label_magne_y"
        android:layout_toEndOf="@+id/raw_label_magne_y"
        android:textColor="@color/graphY" />

    <TextView
        android:id="@+id/raw_value_magne_z"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBaseline="@+id/raw_label_magne_z"
        android:layout_alignBottom="@+id/raw_label_magne_z"
        android:layout_toEndOf="@+id/raw_label_magne_z"
        android:textColor="@color/graphZ" />


    <Chronometer
        android:id="@+id/chronometer"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="193dp"
        android:textSize="22sp" />

    <EditText
        android:id="@+id/edit_text"
        android:layout_width="match_parent"
        android:layout_height="58dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:background="@drawable/rounded_edittext"
        android:inputType="" />


    <Button
        android:id="@+id/button_record"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="126dp"
        android:background="@drawable/button_quit"
        android:shadowColor="#8A8A8A"
        android:shadowDx="0"
        android:shadowDy="1"
        android:text="@string/record"
        android:textColor="#FFF1D6"
        android:textSize="18sp"
        tools:ignore="OnClick"
        tools:text="Record" />

    <Button
        android:id="@+id/button_stop"
        android:layout_width="181dp"
        android:layout_height="38dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="79dp"
        android:background="@drawable/button_bulb_led"
        android:shadowColor="#8A8A8A"
        android:shadowDx="0"
        android:shadowDy="1"
        android:text="@string/save"
        android:textColor="#FFF1D6"
        android:textSize="18sp"
        tools:ignore="OnClick"
        tools:text="Save" />

    <CheckBox
        android:id="@+id/checkBox"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:text="@string/accelerometer"
        android:textSize="20sp" />

    <CheckBox
        android:id="@+id/checkBox2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignEnd="@+id/button_record"
        android:layout_below="@+id/raw_label_acc_z"
        android:text="@string/gyroscope"
        android:textSize="20sp" />

    <CheckBox
        android:id="@+id/checkBox3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/raw_label_gyro_z"
        android:layout_centerHorizontal="true"
        android:text="@string/magnetometer"
        android:textSize="20sp" />

</RelativeLayout>