壓力傳感器沒有得到任何值

我正在處理一個應用程序，其中的一部分是估計用戶所在建築物的樓層。我試圖在設備上使用氣壓計/壓力傳感器，支持它並試圖根據這個做出估計。如果用戶沒有氣壓計/壓力傳感器，應用程序會打開一個手動輸入對話框，否則估計高度和樓層數量。壓力傳感器沒有得到任何值

現在，我只是想讓氣壓計/壓力傳感器工作。我使用的是具有可設定壓力值的Android模擬器，和我的代碼的相關部分被設置如下：

MainActivity.java

public class MainActivity extends AppCompatActivity implements SensorEventListener, .... { 

    //sensor variables 
    public float mPressureValue = 0.0f; 
    public float mHeight = 0.0f; 
    public Integer pressureBasedFloor = 0; 

    //check if device has pressure sensor, setup in OnCreate 
    boolean hasBarometer = false; 

    //pressure sensor to get pressure, height and floor 
    @Override 
    public void onSensorChanged(SensorEvent event) { 
     //if you use this listener as listener of only one sensor (ex, Pressure), then you don't need to check sensor type. 
     //if a pressure sensor exists, use it to calculate height 
     if (hasBarometer) { 
      if(Sensor.TYPE_PRESSURE == event.sensor.getType()) { 
       mPressureValue = event.values[0]; 
       System.out.println("Pressure" + mPressureValue); 
       mHeight = SensorManager.getAltitude(SensorManager.PRESSURE_STANDARD_ATMOSPHERE, mPressureValue); 
       System.out.println("Height" + mHeight); 
       pressureBasedFloor = Math.round(mHeight); 
      } 
     } 
    } 

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

    } 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 

     //check if barometer sensor exists 
     hasBarometer = getPackageManager().hasSystemFeature(PackageManager.FEATURE_SENSOR_BAROMETER); 

     final FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 

     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
        //if user has no barometer sensor, request dialog 
        if (!hasBarometer) { 
         showRequestFloorDialog(view); //no barometer found, manual entry 
        } else { 
         currUserData.setUserFloorNumber(pressureBasedFloor); //barometer found, add calculated floor number to field 
        } 
       } 
      } 
     }); 
    } 
}

currUserData是一個自定義的一個實例class UserData存儲用戶的估計樓層號。我的清單文件設置如下：

<?xml version="1.0" encoding="utf-8"?> 
<manifest xmlns:android="http://schemas.android.com/apk/res/android" 
    package="com.flamedra.findmycar"> 

    <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" /> 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" /> 
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /> 
    <uses-permission android:name="android.permission.INTERNET" /> 
    <uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" /> 
    <uses-feature android:name="android.hardware.sensor.pressure" android:required="true" /> 

    <application 
     android:allowBackup="true" 
     android:icon="@drawable/ic_profile" 
     android:label="@string/app_name" 
     android:supportsRtl="true" 
     android:theme="@style/AppTheme" 
     android:configChanges="orientation|keyboardHidden|screenSize"> 
     <activity 
      android:name=".activities.MainActivity" 
      android:label="@string/app_name" 
      android:theme="@style/AppTheme.NoActionBar" 
      android:configChanges="orientation|keyboardHidden|screenSize" 
      > 
      <intent-filter> 
       <action android:name="android.intent.action.MAIN" /> 

       <category android:name="android.intent.category.LAUNCHER" /> 
      </intent-filter> 
     </activity> 

     <activity 
        android:name=".activities.CompassFragmentActivity" 
        android:theme="@style/AppTheme.NoActionBar" 
        android:configChanges="orientation|keyboardHidden|screenSize" 
        /> 

     <!--Maps Android Key--> 
     <meta-data 
      android:name="com.google.android.geo.API_KEY" 
      android:value="@string/google_maps_api_key" /> 
     <!--Maps Android Key--> 
    </application> 

    <uses-feature 
     android:glEsVersion="0x00020000" 
     android:required="true" /> 

</manifest>

眼下，pressureBasedFloor的整個價值即使在我的仿真器的壓力值設定爲990。有沒有錯誤，保持0。

我在做什麼錯？

來源

2017-04-06 FlameDra

模擬器不會有硬件傳感器，以便更好地移除AndroidManifest.xml中下面一行它說機器人：名字=「android.hardware.sensor.pressure」機器人：要求=「真」

而且在MainActivity中忘記使用SensorManager進行註冊。看看我下面提到的代碼

公共類MainActivity擴展AppCompatActivity實現SensorEventListener {

private SensorManager sensorManager; 
float pressure; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_main); 

    sensorManager = (SensorManager) getSystemService(Service.SENSOR_SERVICE); 
    sensorManager.registerListener(this, 
      sensorManager.getDefaultSensor(Sensor.TYPE_PRESSURE), 
      SensorManager.SENSOR_DELAY_NORMAL); 
} 

@Override 
public void onSensorChanged(SensorEvent event) { 
    if (event.sensor.getType() == Sensor.TYPE_PRESSURE) { 
     pressure = event.values[0]; 
     Log.i("Baro", " Pressure " + pressure); 
    } 
} 

@Override 
public void onAccuracyChanged(Sensor sensor, int accuracy) { 
    Log.i("Baro", " Accuracy " + accuracy); 
}

}

來源

2018-02-13 00:47:22

壓力傳感器沒有得到任何值

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