代碼中使用加速度計爲android平板電腦構建速度計的問題

Question

我正在使用摩托羅拉Xoom與WiFi應用程序開發purpose.I試圖實現代碼來使用加速度計創建速度計，但唯一的問題是我所面臨的是，JAVA編譯器已棄用「Sensorlistener」。我需要一些幫助來解決它。對於JAVA和.xml佈局我使用如下代碼

JAVA

import java.util.Date; 
import java.util.Timer; 
import java.util.TimerTask; 

import android.app.Activity; 
import android.content.Context; 
import android.hardware.SensorListener; 
import android.hardware.SensorManager; 
import android.os.Bundle; 
import android.os.Handler; 
import android.widget.TextView; 

public class Speedometer extends Activity { 

    Handler handler = new Handler(); 

    SensorManager sensorManager; 
    TextView myTextView; 

    float appliedAcceleration = 0; 
    float currentAcceleration = 0; 
    float velocity = 0; 
    Date lastUpdate;  

    @Override 
    public void onCreate(Bundle icicle) { 
     super.onCreate(icicle); 
     setContentView(R.layout.main); 

     myTextView = (TextView)findViewById(R.id.myTextView); 
     lastUpdate = new Date(System.currentTimeMillis()); 

     sensorManager = (SensorManager)getSystemService(Context.SENSOR_SERVICE); 
     sensorManager.registerListener(sensorListener, SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_FASTEST); 

     Timer updateTimer = new Timer("velocityUpdate"); 
     updateTimer.scheduleAtFixedRate(new TimerTask() { 
     public void run() { 
      updateGUI(); 
     } 
     }, 0, 1000); 
    } 

    private void updateGUI() { 
     // Convert from meters per second to miles per hour. 
     final double mph = (Math.round(100*velocity/1.6 * 3.6))/100; 

     // Update the GUI 
     handler.post(new Runnable() { 
     public void run() { 
      myTextView.setText(String.valueOf(mph) + "mph"); 
     } 
    }); 
    } 

    private void updateVelocity() { 
     // Calculate how long this acceleration has been applied. 
     Date timeNow = new Date(System.currentTimeMillis()); 
     long timeDelta = timeNow.getTime()-lastUpdate.getTime(); 
     lastUpdate.setTime(timeNow.getTime()); 

     // Calculate the change in velocity at the 
     // current acceleration since the last update. 
     float deltaVelocity = appliedAcceleration * (timeDelta/1000); 
     appliedAcceleration = currentAcceleration; 

     // Add the velocity change to the current velocity. 
     velocity += deltaVelocity; 
    } 

    private final SensorListener sensorListener = new SensorListener() { 

    double calibration = Double.NaN; 

    public void onSensorChanged(int sensor, float[] values) {   
     double x = values[SensorManager.DATA_X]; 
     double y = values[SensorManager.DATA_Y]; 
     double z = values[SensorManager.DATA_Z]; 

     double a = Math.sqrt(Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2)); 

     if (calibration == Double.NaN) 
     calibration = a; 
     else { 
     updateVelocity(); 
     currentAcceleration = (float)a; 
     } 
    } 

    public void onAccuracyChanged(int sensor, int accuracy) {} 
    }; 
} 

.XML

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:orientation="vertical" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent"> 
    <TextView android:id="@+id/myTextView" 
    android:gravity="center" 
    android:layout_width="fill_parent" 
    android:layout_height="fill_parent" 
    android:textStyle="bold" 
    android:textSize="40sp" 
    android:text="CENTER" 
    android:editable="false" 
    android:singleLine="true" 
    android:layout_margin="10px"/> 
    /> 
</LinearLayout> 

我將是有益的建議表示感謝。

Answer 1

documentation拼出來，只是用SensorEventListener來代替。

Answer 2

在XML文件中爲你關閉的TextView標籤

android:layout_margin="10px"/> 
    /> 
</LinearLayout> 

只需刪除其中一個寫道兩次/>。