How to add a click method in sensor

问题:

I have successfully, with a fellow programmers help to create the following code:

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.Toast;

public class SensorTestActivity 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) {
        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();
    }

    @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];

        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);
    }
}

Right now i am trying to add something like..

Switch.setOnClickListener(new View.OnClickListener() { 
    @Override 
      public void onClick(View v) { 
          if (sensorIsOn) { 
              //deactivate it 
           } else { 
              //activate it 
          } 
    } 

});

I want to click on a button and deseable sensor and on clicking again enabling it!

回答1:

You should just register or unregister the listener. Just as you should in onPause and onResume (I think).

mSensorManager.registerListener(this, jAccelerometer,
            SensorManager.SENSOR_DELAY_NORMAL);

mSensorManager.unregisterListener(this);

回答2:

in onCreate() method , after you register the sensor's listener, set the Tag of your Switch button to true :

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();

        Button Switch = (Button) findViewById(R.id.switch_button);
        Switch.setTag(true);
        //set the listener for your Switch button here
    }

And in the onClick() method : try this code :

Switch.setOnClickListener(new View.OnClickListener() { 
    @Override 
      public void onClick(View v) { 
          boolean isSensorActivated = (boolean) v.getTag();
          if(isSensorActivated) {
              mSensorManager.registerListener(this, jAccelerometer,
            SensorManager.SENSOR_DELAY_NORMAL);
          }
          else {
              mSensorManager.unregisterListener(this);
          }
          v.setTag(!isSensorActivated);
     } 

});