使用加速度计移动的简单循环

Question

我根据目前所掌握的内容再次重新编辑了整个主题，因为我对上一个主题有很多看法并且没有回复。与此同时，我有点弄清楚加速度计是如何工作的。

现在我有一个圆形（画布），如果你不介意的话，我想将其称为“Zoga”。该循环应根据手机的角度移动。因此，基本上，如果手机向左侧移动，则圆圈向左侧移动，如果手机向右下侧移动，则圆圈向该方向移动。

该循环是通过 Zoga.java 类创建的，整个过程都在 GravitacijaActivity.java 中进行。

这是我有两个问题：
1.) 圆仅向左移动。
2.) 圆圈移出屏幕（当然在左侧）。

关于如何解决此问题有什么想法吗？

注意：我已经附上了我的整个代码，甚至是布局 main.xml，以防万一其他人以后需要该代码，用于教育和学习目的:)

GravitaijaActivity.java

package gravity.pack;
import android.app.Activity;
import android.os.Bundle;
import android.widget.FrameLayout;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;

public class GravitacijaActivity extends Activity implements SensorEventListener{
    public float xPos = 50.0f, yPos = 50.0f;
    public float xAcc = 0.0f, yAcc = 0.0f;
    public int radius = 30;
    private SensorManager sensorManager;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),
                    SensorManager.SENSOR_DELAY_GAME);

        FrameLayout main = (FrameLayout) findViewById(R.id.main_view);
        main.addView(new Zoga(this, xPos, yPos, radius));
}

public void onAccuracyChanged(Sensor arg0, int arg1) {
    // TODO Auto-generated method stub

}

public void onSensorChanged(SensorEvent sensorArg) {
    if (sensorArg.sensor.getType() == Sensor.TYPE_ORIENTATION)
    {
            xAcc = sensorArg.values[1];
            yAcc = sensorArg.values[2];
        updateZoga();

    }

}

public void updateZoga()
{
    xPos += xAcc;
    yPos += yAcc;
    FrameLayout main = (FrameLayout) findViewById(R.id.main_view);
    main.removeAllViews();
    main.addView(new Zoga(this, xPos, yPos, radius));
    try {
        Thread.sleep(1);
    } catch (InterruptedException e) {}

  }         
}

Zoga .java

package gravity.pack;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.view.View;

public class Zoga extends View{
    private final float x;
    private final float y;
    private final float r;
    private final Paint mPaint = new Paint (Paint.ANTI_ALIAS_FLAG);

    public Zoga(Context context, float x, float y, float r) {
        super(context);
        mPaint.setColor(0xFFFF0000);
        this.x = x;
        this.y = y;
        this.r = r;
    }

    @Override
    protected void onDraw(Canvas canvas){
        super.onDraw(canvas);
        canvas.drawCircle(x, y, r, mPaint);
    } 
}

布局 main.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout android:id="@+id/main_view"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FF66FF33" />

Answer 1

你做错了。您正在将加速度值添加到位置值中。相反，您应该不断添加加速度值，通过此您将获得速度值。现在，如果您继续添加速度值，您将获得位置值。现在您应该将此位置值添加到函数 updateZoga 中

Answer 2

我对 onSensorChange 代码做了一些更改以在屏幕中移动球。在我的例子中，球没有正确移动，为此我做了一些改变。这个例子对我来说效果很好。

public void onSensorChanged(SensorEvent sensorEvent)
{
    //Try synchronize the events
    synchronized(this){
    //For each sensor
    switch (sensorEvent.sensor.getType()) {
    case Sensor.TYPE_MAGNETIC_FIELD: //Magnetic sensor to know when the screen is landscape or portrait
        //Save values to calculate the orientation
        mMagneticValues = sensorEvent.values.clone();
        break;
    case Sensor.TYPE_ACCELEROMETER://Accelerometer to move the ball
        if (bOrientacion==true){//Landscape
            //Positive values to move on x
            if (sensorEvent.values[1]>0){
                //In margenMax I save the margin of the screen this value depends of the screen where we run the application. With this the ball not disapears of the screen
                if (x<=margenMaxX){
                    //We plus in x to move the ball
                    x = x + (int) Math.pow(sensorEvent.values[1], 2);
                }
            }
            else{
                //Move the ball to the other side
                if (x>=margenMinX){
                    x = x - (int) Math.pow(sensorEvent.values[1], 2);
                }
            }
            //Same in y
            if (sensorEvent.values[0]>0){
                if (y<=margenMaxY){
                    y = y + (int) Math.pow(sensorEvent.values[0], 2);
                }
            }
            else{
                if (y>=margenMinY){
                    y = y - (int) Math.pow(sensorEvent.values[0], 2);
                }
            }
        }
        else{//Portrait
            //Eje X
            if (sensorEvent.values[0]<0){
                if (x<=margenMaxX){
                    x = x + (int) Math.pow(sensorEvent.values[0], 2);
                }
            }
            else{
                if (x>=margenMinX){
                    x = x - (int) Math.pow(sensorEvent.values[0], 2);
                }
            }
            //Eje Y
            if (sensorEvent.values[1]>0){
                if (y<=margenMaxY){
                    y = y + (int) Math.pow(sensorEvent.values[1], 2);
                }
            }
            else{
                if (y>=margenMinY){
                    y = y - (int) Math.pow(sensorEvent.values[1], 2);
                }
            }

        }
        //Save the values to calculate the orientation
        mAccelerometerValues = sensorEvent.values.clone();
        break;  
    case Sensor.TYPE_ROTATION_VECTOR:  //Rotation sensor
        //With this value I do the ball bigger or smaller
        if (sensorEvent.values[1]>0){
            z=z+ (int) Math.pow(sensorEvent.values[1]+1, 2);
        }
        else{
            z=z- (int) Math.pow(sensorEvent.values[1]+1, 2);                    
        }

    default:
        break;
    }
    //Screen Orientation
    if (mMagneticValues != null && mAccelerometerValues != null) {
        float[] R = new float[16];
        SensorManager.getRotationMatrix(R, null, mAccelerometerValues, mMagneticValues);
        float[] orientation = new float[3];
        SensorManager.getOrientation(R, orientation);
        //if x have positives values the screen orientation is landscape in other case is portrait
        if (orientation[0]>0){//LandScape
            //Here I change the margins of the screen for the ball not disapear
            bOrientacion=true;
            margenMaxX=1200;
            margenMinX=0;
            margenMaxY=500;
            margenMinY=0;
        }
        else{//Portrait
            bOrientacion=false;
            margenMaxX=600;
            margenMinX=0;
            margenMaxY=1000;
            margenMinY=0;
        }

    }
    }
}

我画球的视图类

public class CustomDrawableView extends View
{
    static final int width = 50;
    static final int height = 50;
    //Constructor de la figura
    public CustomDrawableView(Context context)
    {
        super(context);

        mDrawable = new ShapeDrawable(new OvalShape());
        mDrawable.getPaint().setColor(0xff74AC23);
        mDrawable.setBounds(x, y, x + width, y + height);
    }
    //Dibujamos la figura
    protected void onDraw(Canvas canvas)
    {
        //Actividad_Principal x,y,z are variables from the main activity where I have the onSensorChange
        RectF oval = new RectF(Actividad_Principal.x+Actividad_Principal.z, Actividad_Principal.y+Actividad_Principal.z, Actividad_Principal.x + width, Actividad_Principal.y + height);             
        Paint p = new Paint(); 
        p.setColor(Color.BLUE);
        canvas.drawOval(oval, p);
        invalidate();
    }
}

}

就是这样，希望对我们有帮助。