背景

Question

package com.example.shake; 
import java.util.List; 
import java.util.Locale; 
import android.app.Activity; 
import android.graphics.Color; 
import android.hardware.Sensor; 
import android.hardware.SensorEvent; 
import android.hardware.SensorEventListener; 
import android.hardware.SensorManager; 
import android.location.Address; 
import android.location.Geocoder; 
import android.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.Toast; 

public class MainActivity extends Activity implements SensorEventListener { 
    private SensorManager sensorManager; 
    private boolean color = false; 
    private View view; 
    private long lastUpdate; 

/** Called when the activity is first created. */ 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
    requestWindowFeature(Window.FEATURE_NO_TITLE); 
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
     WindowManager.LayoutParams.FLAG_FULLSCREEN); 

    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 
    view = findViewById(R.id.textView); 
    view.setBackgroundColor(Color.GREEN); 

    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
    lastUpdate = System.currentTimeMillis(); 
    } 

    @Override 
    public void onSensorChanged(SensorEvent event) { 
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) { 
     getAccelerometer(event); 
    } 

    } 

    private void getAccelerometer(SensorEvent event) { 
    float[] values = event.values; 
    // Movement 
    float x = values[0]; 
    float y = values[1]; 
    float z = values[2]; 
    double latitude=0; 
    double longitude=0; 
    String location_message; 
    GPSTracker gps; 

    float accelationSquareRoot = (x * x + y * y + z * z) 
     /(SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH); 
    long actualTime = System.currentTimeMillis(); 
    if (accelationSquareRoot >= 2.4) // 
    { 
     if (actualTime - lastUpdate < 200) { 
     return; 
     } 
     lastUpdate = actualTime; 
     gps=new GPSTracker(MainActivity.this); 
     if(gps.canGetLocation()){  
     latitude = gps.getLatitude(); 
     longitude = gps.getLongitude(); 
     // \n is for new line 
     //Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show(); 
     Geocoder gcd = new Geocoder(MainActivity.this, Locale.getDefault()); 
     try{ 
     List<Address> addresses = gcd.getFromLocation(latitude, longitude, 1); 
     location_message= addresses.get(0).getLocality(); 
     if (addresses.size() > 0) 
     { 
      Toast.makeText(getApplicationContext(), "Your Location is "  +addresses.get(0).getLocality() 
      , Toast.LENGTH_LONG).show(); 
     } 
     }catch(Exception e) 
     { 
      System.out.print(e); 
     } 
    }else{ 
     // can't get location 
     // GPS or Network is not enabled 
     // Ask user to enable GPS/network in settings 
     Toast.makeText(getApplicationContext(), "Switch on gps" 
       , Toast.LENGTH_LONG).show(); 
     gps.showSettingsAlert(); 
    } 


     /*Toast.makeText(this, "Device was shuffed", Toast.LENGTH_SHORT) 
      .show(); 
     if (color) { 
     view.setBackgroundColor(Color.GREEN); 

     } else { 
     view.setBackgroundColor(Color.RED); 
     }*/ 
     color = !color; 
    } 
    } 

    @Override 
     public void onAccuracyChanged(Sensor sensor, int accuracy) { 

    } 

    @Override 
    protected void onResume() { 
    super.onResume(); 
    // register this class as a listener for the orientation and 
    // accelerometer sensors 
    sensorManager.registerListener(this, 
     sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
     SensorManager.SENSOR_DELAY_NORMAL); 
    } 

    @Override 
    protected void onPause() { 
    // unregister listener 
    super.onPause(); 
    sensorManager.unregisterListener(this); 
    } 
} 

此代码运行应用程序，让你的时候摇mobile.I要创建一个监视摇参数在后台的应用程序，并自动显示location.I知道它可以这样做的当前位置在Android的服务类，但作为一个初学者，我不知道如何实现它。是否有任何其他方式来做到这一点？任何人都可以帮助我

Answer 1

看看这个示例代码：您需要实现监听器，如图所示。

public class Accelerometer extends Service implements AccelerometerListener{ private static 
Context CONTEXT; 

@Override 
public IBinder onBind(Intent intent) { 
// TODO Put your code here 
return null; 
} 

@Override 
public void onCreate() { 
System.out.println(”start listening”); 
// if (AccelerometerManager.isSupported()) { AccelerometerManager.startListening(this); 

// } 
} 

@Override 
public void onDestroy() { 
System.out.println(”stop listening”); 
// if (AccelerometerManager.isListening()) { AccelerometerManager.stopListening(); 
// } 
} 



/** 
* onShake callback 
*/ 
public void onShake(float force) { 
Toast.makeText(this, “Phone shaked omha ya 3ammi el7ag: ” + force,    1000).show(); } 

/** 
* onAccelerationChanged callback 
*/ 
public void onAccelerationChanged(float x, float y, float z) { System.out.println(”x =  “+x+” y = “+y+” z = “+z); } 

} 

请点击此link您的其他信息