将Android运动传感器设置为数组并显示值[重复]

Question

我在寻求帮助。我上过Android编程课，我们需要构建一个应用程序，将传感器数据（加速度计、陀螺仪和磁场）放入数组中，并显示值。不幸的是，我只知道基本的Java，我觉得有些逻辑卡住了。

我通过显示传感器的实时值启动了我的应用程序。我能做到，但太吵了，不准确。因此，我试图将传感器生成的值存储到一个数组中，然后在文本视图中显示这些值。现在，当我运行应用程序时，它只会崩溃。我不确定我遗漏了什么，但可能是一些Java逻辑。总之，我已经正确设置了UI。我有主要的活动。java和单独的java类来收集使用getter和setter设置的传感器数据。

Mainactive代码：

package com.example.servicesassignmentone;

import androidx.appcompat.app.AppCompatActivity;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity implements SensorEventListener{
    private Button myButton;
    Handler myHandler = new Handler();

    private TextView accelerometerX, accelerometerY, accelerometerZ;
    private SensorManager sensorManager;
    private Sensor sensorAccelerometer;
    private boolean sensorAccelerometerSet = false;
    private List<Accelerometer> accelerometerListValues = new ArrayList<Accelerometer>();

    private TextView gyroscopeX, gyroscopeY, gyroscopeZ;
    private Sensor sensorGyroscope;
    private boolean sensorGyroscopeSet = false;
    private List<Gyroscope> gyroscopeLastValues = new ArrayList<Gyroscope>();

    private TextView magFieldX, magFieldY, magFieldZ;
    private Sensor sensorMagField;
    private boolean sensorMagFieldSet = false;
    private List<MagField> magFieldLastValues = new ArrayList<MagField>();


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // button and UI initialization
        myButton = (Button) findViewById(R.id.myButton);
        //Accelerometer
        accelerometerX = (TextView) findViewById(R.id.textViewAccX);
        accelerometerY = (TextView) findViewById(R.id.textViewAccY);
        accelerometerZ = (TextView) findViewById(R.id.textViewAccZ);
        //Gyroscope
        gyroscopeX = (TextView) findViewById(R.id.textViewGyroX);
        gyroscopeY = (TextView) findViewById(R.id.textViewGyroY);
        gyroscopeZ = (TextView) findViewById(R.id.textViewGyroZ);
        //Magnetic Field
        magFieldX = (TextView) findViewById(R.id.textViewMagX);
        magFieldY = (TextView) findViewById(R.id.textViewMagY);
        magFieldZ = (TextView) findViewById(R.id.textViewMagZ);

        // initializing the sensor manager
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        // initializing the different sensors
        sensorAccelerometer = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        sensorGyroscope = sensorManager.getDefaultSensor(Sensor.TYPE_GYROSCOPE);
        sensorMagField = sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);

        myButton.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                switch (view.getId()){
                    case R.id.myButton:
                    sensorManager.registerListener((SensorEventListener) MainActivity.this, sensorAccelerometer, SensorManager.SENSOR_DELAY_FASTEST);
                    sensorManager.registerListener((SensorEventListener) MainActivity.this, sensorGyroscope, SensorManager.SENSOR_DELAY_FASTEST);
                    sensorManager.registerListener((SensorEventListener) MainActivity.this, sensorMagField, SensorManager.SENSOR_DELAY_FASTEST);
                    break;
                }
            }
        });
    }

    @Override
    protected void onResume() {
        super.onResume();
        sensorAccelerometerSet = false;
        sensorGyroscopeSet = false;
        sensorMagFieldSet = false;
        sensorManager.registerListener((SensorEventListener) this, sensorAccelerometer, SensorManager.SENSOR_DELAY_FASTEST);
        sensorManager.registerListener((SensorEventListener) this, sensorGyroscope, SensorManager.SENSOR_DELAY_FASTEST);
        sensorManager.registerListener((SensorEventListener) this, sensorMagField, SensorManager.SENSOR_DELAY_FASTEST);

    }

    @Override
    protected void onPause() {
        super.onPause();
        sensorManager.unregisterListener((SensorEventListener) this);
    }


    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {

        //Using the arraylist
        Float accelerValuesX, accelerValuesY, accelerValuesZ;
        Float gyroValuesX, gyroValuesY, gyroValuesZ;
        Float magValuesX, magValuesY, magValuesZ;

       //if (accelerometerListValues.size() >= 500 && gyroscopeLastValues.size() >= 500 && magFieldLastValues.size() >= 500) {
       //}

        if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            accelerValuesX = sensorEvent.values[0];
            accelerValuesY = sensorEvent.values[1];
            accelerValuesZ = sensorEvent.values[2];
          accelerometerListValues.add(new Accelerometer(accelerValuesX, accelerValuesY, accelerValuesZ));
          for (int i = 0; i < accelerometerListValues.size(); i++) {
              Accelerometer output = accelerometerListValues.get(i);
              accelerometerX.setText((CharSequence) output);
          }
            }
        if (sensorEvent.sensor.getType() == Sensor.TYPE_GYROSCOPE) {
            gyroValuesX = sensorEvent.values[0];
            gyroValuesY = sensorEvent.values[1];
            gyroValuesZ = sensorEvent.values[2];
            gyroscopeLastValues.add(new Gyroscope(gyroValuesX, gyroValuesY, gyroValuesZ));
            for (int i = 0; i < gyroscopeLastValues.size(); i++) {
                 Gyroscope output = gyroscopeLastValues.get(i);
                gyroscopeX.setText((CharSequence) output);
            }
        }
        if (sensorEvent.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD) {
            magValuesX = sensorEvent.values[0];
            magValuesY = sensorEvent.values[1];
            magValuesZ = sensorEvent.values[2];
            magFieldLastValues.add(new MagField(magValuesX, magValuesY, magValuesZ));
            for (int i = 0; i < magFieldLastValues.size(); i++) {
                MagField output = magFieldLastValues.get(i);
                magFieldX.setText((CharSequence) output);
            }
        }

Answer 1

从您提供的调试日志

E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.servicesassignmentone, PID: 28780 java.lang.ClassCastException: com.example.servicesassignmentone.Accelerometer cannot be cast to java.lang.CharSequence

问题发生在MainActivity.java:120（第120行）

for (int i = 0; i < accelerometerListValues.size(); i++) {
    Accelerometer output = accelerometerListValues.get(i);
    accelerometerX.setText((CharSequence) output); // Program crash at this line
}

变量输出是一个加速计，但您要将其转换为字符序列。我不知道该怎么做。实例服务SignmentOne。加速计看起来好像没有显示代码，但我相信可能有一种方法可以让您访问它的值。