android - 使用android的加速度计移动图像

Question

我已阅读有关访问手机加速度计(加速度和方向)值的文章/教程。我正在尝试构建一个简单的应用程序，我可以在其中使用这些值移动球图像。这是我的代码:

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
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.widget.TextView;

public class Accelerometer extends Activity implements SensorEventListener {
    /** Called when the activity is first created. */
     CustomDrawableView mCustomDrawableView = null; 
     ShapeDrawable mDrawable = new ShapeDrawable(); 
      int x ; 
       int y ;

    private SensorManager sensorManager = null;

       /** Called when the activity is first created. */
       @Override
       public void onCreate(Bundle savedInstanceState) {

           super.onCreate(savedInstanceState);
           // Get a reference to a SensorManager
           sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
           mCustomDrawableView = new CustomDrawableView(this); 
           setContentView(mCustomDrawableView); 
         //  setContentView(R.layout.main);

       }

       // This method will update the UI on new sensor events
       public void onSensorChanged(SensorEvent sensorEvent) {
         {
         if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

         int someNumber = 100;
         float xChange = someNumber * sensorEvent.values[1];
         //values[2] can be -90 to 90
         float yChange = someNumber * 2 * sensorEvent.values[2];       
             x = x + (int)xChange;
             y = y + (int)yChange;

         }


         if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) {

         }
        }
       }

       // I've chosen to not implement this method
       public void onAccuracyChanged(Sensor arg0, int arg1) {
     // TODO Auto-generated method stub

    }

       @Override
       protected void onResume() {
        super.onResume();
        // Register this class as a listener for the accelerometer sensor
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
        // ...and the orientation sensor
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL);
       }

       @Override
       protected void onStop() {
        // Unregister the listener
        sensorManager.unregisterListener(this);
        super.onStop();
       } 
       public  class CustomDrawableView extends View { 

           public CustomDrawableView(Context context) { 
               super(context); 

               int width = 50; 
               int height = 50; 
               mDrawable = new ShapeDrawable(new OvalShape()); 
               mDrawable.getPaint().setColor(0xff74AC23); 
               mDrawable.setBounds(x, y, x + width, y + height); 
           } 
           protected void onDraw(Canvas canvas) { 
               mDrawable.draw(canvas); 
               invalidate(); 
           } 
       }
}

我在屏幕上显示了一个椭圆形，但之后没有任何反应。

谢谢

Answer 1

使用此代码。初始化该类后，您永远不会设置可绘制对象的位置。您必须进行一些计算才能正确设置球的位置。您这样做的方式是获取超过 10000 的值，这会在屏幕外绘制椭圆。

import android.app.Activity;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.OvalShape;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;

public class Accelerometer extends Activity implements SensorEventListener
{
    /** Called when the activity is first created. */
    CustomDrawableView mCustomDrawableView = null;
    ShapeDrawable mDrawable = new ShapeDrawable();
    public static int x;
    public static int y;

    private SensorManager sensorManager = null;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {

        super.onCreate(savedInstanceState);
        // Get a reference to a SensorManager
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mCustomDrawableView = new CustomDrawableView(this);
        setContentView(mCustomDrawableView);
        // setContentView(R.layout.main);

    }

    // This method will update the UI on new sensor events
    public void onSensorChanged(SensorEvent sensorEvent)
    {
        {
            if (sensorEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
                // the values you were calculating originally here were over 10000!
                x = (int) Math.pow(sensorEvent.values[1], 2); 
                y = (int) Math.pow(sensorEvent.values[2], 2);

            }

            if (sensorEvent.sensor.getType() == Sensor.TYPE_ORIENTATION) {

            }
        }
    }

    // I've chosen to not implement this method
    public void onAccuracyChanged(Sensor arg0, int arg1)
    {
        // TODO Auto-generated method stub

    }

    @Override
    protected void onResume()
    {
        super.onResume();
        // Register this class as a listener for the accelerometer sensor
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
                SensorManager.SENSOR_DELAY_NORMAL);
        // ...and the orientation sensor
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                SensorManager.SENSOR_DELAY_NORMAL);
    }

    @Override
    protected void onStop()
    {
        // Unregister the listener
        sensorManager.unregisterListener(this);
        super.onStop();
    }

    public class CustomDrawableView extends View
    {
        static final int width = 50;
        static final int height = 50;

        public CustomDrawableView(Context context)
        {
            super(context);

            mDrawable = new ShapeDrawable(new OvalShape());
            mDrawable.getPaint().setColor(0xff74AC23);
            mDrawable.setBounds(x, y, x + width, y + height);
        }

        protected void onDraw(Canvas canvas)
        {
            RectF oval = new RectF(Accelerometer.x, Accelerometer.y, Accelerometer.x + width, Accelerometer.y
                    + height); // set bounds of rectangle
            Paint p = new Paint(); // set some paint options
            p.setColor(Color.BLUE);
            canvas.drawOval(oval, p);
            invalidate();
        }
    }
}