我最近开始编写Android，我试图使用跟踪步数，速度和距离的代码。我编写的代码没有错误，但在虚拟电话中打开时崩溃。我不知道为什么会这样，任何帮助将不胜感激。
package com.example.runnable;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.ServiceConnection;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.LocationManager;
import android.os.IBinder;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.SeekBar;
import android.widget.TextView;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
private TextView textViewX;
private TextView textViewY;
private TextView textViewZ;
private TextView textSensitive;
private TextView textSteps;
private Button buttonReset;
private SensorManager sensorManager;
private float acceleration;
private float previousY;
private float currentY;
private int numSteps;
private SeekBar seekBar;
private double threshold;
LocationService myService;
static boolean status;
LocationManager locationManager;
static TextView dist, time, speed;
Button start, pause, stop;
static long startTime, endTime;
ImageView image;
static ProgressDialog locate;
static int p = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//textViewX = (TextView) findViewById(R.id.textViewX);
//textViewY = (TextView) findViewById(R.id.textViewY);
//textViewZ = (TextView) findViewById(R.id.textViewZ);
textSteps = (TextView) findViewById(R.id.stepsValue);
//textSensitive = (TextView) findViewById(R.id.textSensitive);
Button buttonStart = (Button) findViewById(R.id.startBtn);
threshold = 5.8;
//textSensitive.setText(String.valueOf(threshold));
previousY = 0;
currentY = 0;
numSteps = 0;
acceleration = 0.00f;
buttonStart.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
enableAccelerometerListening();
//The method below checks if Location is enabled on device or not. If not, then an alert dialog box appears with option
//to enable gps.
checkGps();
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
return;
}
if (status == false)
//Here, the Location Service gets bound and the GPS Speedometer gets Active.
bindService();
locate = new ProgressDialog(MainActivity.this);
locate.setIndeterminate(true);
locate.setCancelable(false);
locate.setMessage("Getting Location...");
locate.show();
start.setVisibility(View.GONE);
//pause.setVisibility(View.VISIBLE);
//pause.setText("Pause");
//stop.setVisibility(View.VISIBLE);
}
});
}
//This method leads you to the alert dialog box.
void checkGps() {
locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
if (!locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
showGPSDisabledAlertToUser();
}
}
//This method configures the Alert Dialog box.
private void showGPSDisabledAlertToUser() {
AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(this);
alertDialogBuilder.setMessage("Enable GPS to use application")
.setCancelable(false)
.setPositiveButton("Enable GPS",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
Intent callGPSSettingIntent = new Intent(
android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
startActivity(callGPSSettingIntent);
}
});
alertDialogBuilder.setNegativeButton("Cancel",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
dialog.cancel();
}
});
AlertDialog alert = alertDialogBuilder.create();
alert.show();
}
private void enableAccelerometerListening() {
sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), sensorManager.SENSOR_DELAY_NORMAL);
}
private SensorEventListener sensorEventListener = new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent event) {
float x = event.values[0];
float y = event.values[1];
float z = event.values[2];
currentY = y;
if (Math.abs(currentY - previousY) > threshold) {
numSteps++;
textSteps.setText(String.valueOf(numSteps));
}
//textViewX.setText(String.valueOf(x));
//textViewY.setText(String.valueOf(y));
//textViewZ.setText(String.valueOf(z));
previousY = y;
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
};
private ServiceConnection sc = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
LocationService.LocalBinder binder = (LocationService.LocalBinder) service;
myService = binder.getService();
status = true;
}
@Override
public void onServiceDisconnected(ComponentName name) {
status = false;
}
};
void bindService() {
if (status == true)
return;
Intent i = new Intent(getApplicationContext(), LocationService.class);
bindService(i, sc, BIND_AUTO_CREATE);
status = true;
startTime = System.currentTimeMillis();
}
void unbindService() {
if (status == false)
return;
Intent i = new Intent(getApplicationContext(), LocationService.class);
unbindService(sc);
status = false;
}
@Override
protected void onResume() {
super.onResume();
}
@Override
protected void onStart() {
super.onStart();
}
// public void resetSteps(View v) {
// numSteps = 0;
// textSteps.setText(String.valueOf(numSteps));
//}
}