我已经阅读了关于访问手机加速度计(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,我可以使用这些值移动球形图像.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();
}
}
}
我在屏幕上显示椭圆形,但没有发生任何事情.
谢谢
解决方法
使用此代码.在你开始这个课程之后,你从来没有设置可绘制的位置.你必须做一些计算来正确设置球的位置.你这样做的方式是获得超过10000的值,这是画出椭圆形的屏幕.
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.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 + 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();
}
}
}
