搖動傳感器不工作

Question

我想讓我的搖動傳感器工作。在晃動我的android手機使事情發生時，現在沒有反應，當我搖動我的手機。我的代碼如下：

private SensorManager mSensorManager; 
    private float mAccel; // acceleration apart from gravity 
    private float mAccelCurrent; // current acceleration including gravity 
    private float mAccelLast; // last acceleration including gravity 

，並在OnCreate：

mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
     mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL); 
     mAccel = 0.00f; 
     mAccelCurrent = SensorManager.GRAVITY_EARTH; 
     mAccelLast = SensorManager.GRAVITY_EARTH; 

上acitvity

private final SensorEventListener mSensorListener = new SensorEventListener() { 

     public void onSensorChanged(SensorEvent se) { 
      float x = se.values[0]; 
      float y = se.values[1]; 
      float z = se.values[2]; 
      mAccelLast = mAccelCurrent; 
      mAccelCurrent = FloatMath.sqrt(x*x + y*y + z*z); 
      float delta = mAccelCurrent - mAccelLast; 
      mAccel = mAccel * 0.9f + delta * 0.1f; // perform low-cut filter 
     } 

     public void onAccuracyChanged(Sensor sensor, int accuracy) { 
      if(mAccel > 0.1) 
      { 
      Toast toast = Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG); toast.show(); 
      } 

     } 
    }; 

Answer 1

喜在這裏，我補充示例源代碼抖動傳感器。請嘗試這個例子。希望它對你有幫助。請讓我知道你是否有任何問題。謝謝。

main.xml中

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_above="@+id/footer" 
    android:padding="10dp" 
    android:background="#eaeae8" > 

    <TextView 
     android:id="@+id/txtSettings" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:padding="10dp" 
     android:text="Enable and Disable the Sensor"> 

    </TextView> 

    <TextView 
      android:id="@+id/label" 
     android:layout_width="fill_parent" 
     android:layout_height="fill_parent" 
     android:padding="10dip" 
     android:textSize="16sp" 
     android:textStyle="bold" > 
     </TextView> 

     <RadioGroup 
      android:id="@+id/sensorSettings" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_alignLeft="@+id/txtSettings" 
      android:layout_below="@+id/txtSettings" 
      android:layout_marginTop="18dp" > 

      <RadioButton 
       android:id="@+id/enable" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:text="Sensor Enable" /> 

      <RadioButton 
       android:id="@+id/disable" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:text="Sensor Disable" /> 
     </RadioGroup> 

</RelativeLayout> 

SensorTestActivity.java

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.os.Bundle; 
import android.view.View; 
import android.view.Window; 
import android.view.WindowManager; 
import android.widget.RadioGroup; 
import android.widget.RadioGroup.OnCheckedChangeListener; 
import android.widget.Toast; 

public class SensorTestActivity extends Activity implements SensorEventListener { 
    private SensorManager sensorManager; 
    private boolean color = false; 
    private View view; 
    private long lastUpdate; 
    static boolean enableSensor = true; 

    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
       WindowManager.LayoutParams.FLAG_FULLSCREEN); 

     setContentView(R.layout.main); 
     view = findViewById(R.id.label); 
     view.setBackgroundColor(Color.GREEN); 

     sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); 
     sensorManager.registerListener(this, 
       sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), 
       SensorManager.SENSOR_DELAY_NORMAL); 
     lastUpdate = System.currentTimeMillis(); 

     RadioGroup sensorSettings =(RadioGroup)findViewById(R.id.sensorSettings); 
     sensorSettings.setOnCheckedChangeListener(new OnCheckedChangeListener(){ 
      @Override 
     public void onCheckedChanged(RadioGroup group, int checkedId) { 
      // checkedId is the RadioButton selected 
      switch(checkedId) { 
      case R.id.enable: 
       enableSensor = true; 
       break; 
      case R.id.disable: 
       enableSensor = false; 
       break; 
      } 
     } 
     }); 
    } 

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

    } 

    private void getAccelerometer(SensorEvent event) { 
     float[] values = event.values; 
     // Movement 
     float x = values[0]; 
     float y = values[1]; 
     float z = values[2]; 

     float accelationSquareRoot = (x * x + y * y + z * z) 
       /(SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH); 
     long actualTime = System.currentTimeMillis(); 
     if (accelationSquareRoot >= 2) // 
     { 
      if (actualTime - lastUpdate < 200) { 
       return; 
      } 
      lastUpdate = actualTime; 
      Toast.makeText(this, "Device has shaken", 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); 
    } 
} 

請添加AndroidManifest權限。

<uses-permission android:name="android.permission.VIBRATE" />