接近傳感器在Android不響應

我想建立一個簡單的Android應用程序時，接近傳感器值的變化，其更新一個TextView的文本。但是，儘管將物體靠近傳感器，textview值仍保持不變。接近傳感器在Android不響應

這裏是我的MainActivity.java代碼

import android.hardware.Sensor; 
import android.hardware.SensorEvent; 
import android.hardware.SensorEventListener; 
import android.hardware.SensorManager; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.widget.TextView; 

public class MainActivity extends AppCompatActivity implements SensorEventListener{ 



    private SensorManager mSensorManager; 
    private Sensor mProximity; 
    TextView textView; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 
// Get an instance of the sensor service, and use that to get an instance of 
     // a particular sensor. 
     mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
     mProximity = mSensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY); 
     mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL); 
     textView = (TextView) findViewById(R.id.newtext); 

    } 


    public final void onAccuracyChanged(Sensor sensor, int accuracy) { 
     // Do something here if sensor accuracy changes. 
    } 


    public final void onSensorChanged(SensorEvent event) { 
     float distance = event.values[0]; 
     textView.setText(""+event.values[0]); 
     if (distance<3){ 
      textView.setText("near"+distance); 
     } 
     // Do something with this sensor data. 
    } 

    @Override 
    protected void onResume() { 
     // Register a listener for the sensor. 
     super.onResume(); 
     mSensorManager.registerListener(this, mProximity, SensorManager.SENSOR_DELAY_NORMAL); 
    } 

    @Override 
    protected void onPause() { 
     // Be sure to unregister the sensor when the activity pauses. 
     super.onPause(); 
     mSensorManager.unregisterListener(this); 
    } 
}

這裏是我的XML代碼：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:id="@+id/activity_main" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:paddingBottom="@dimen/activity_vertical_margin" 
    android:orientation="vertical" 
    android:paddingLeft="@dimen/activity_horizontal_margin" 
    android:paddingRight="@dimen/activity_horizontal_margin" 
    android:paddingTop="@dimen/activity_vertical_margin" 
    tools:context="com.example.suzancruz.senapp.MainActivity"> 

    <TextView 
     android:layout_width="200dp" 
     android:layout_height="200dp" 
     android:id="@+id/newtext" 
     android:text="hjkhjk" 
     /> 

</LinearLayout>

來源

2017-03-20 Suzan Cruz

有你添加的權限在清單中？ – AwaisMajeed

我已經使用權限：<使用的許可機器人：名稱=「android.permission.BODY_SENSORS」 /> –

和這個???? '<使用特徵機器人：名字= 「android.hardware.sensor.proximity」機器人：要求= 「真」/>' – AwaisMajeed

請改變你的邏輯onSensorChanged方法，

@Override 
public void onSensorChanged(SensorEvent event) { 
    if (event.sensor.getType() == Sensor.TYPE_PROXIMITY) { 
     if (event.values[0] < mSensor.getMaximumRange()) { 
      if (!wakeLock.isHeld()) { 
       wakeLock.acquire(); 
      } 
     } else { 
      if (wakeLock.isHeld()) { 
       wakeLock.release(); 
      } 
     } 
    } 
}

來源

2017-08-17 13:22:11 user2394849

接近傳感器在Android不響應

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