[Android] 가속도센서를 사용해보다.

Android 가속센서를 사용해보다.

가속도센서를 등록하면 SensorEvent의 values배열에 x, y, z의 가속도가 순서대로 들어오기 때문에 의외로 간단하게 사용할 수 있었다.

가속도센서에 따라 이미지가 움직인다.



Activity를 등록할 때 화면을 수직으로 고정시켰다.(수직방향이 계산하기 쉬워서)

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
 package="com.babukuma.android.test" android:versionCode="1"
 android:versionName="1.0">
 <application android:icon="@drawable/icon" android:label="@string/app_name">
  <activity android:name=".SensorActivity" android:screenOrientation="portrait"
   android:label="@string/app_name">
   <intent-filter>
    <action android:name="android.intent.action.MAIN" />
    <category android:name="android.intent.category.LAUNCHER" />
   </intent-filter>
  </activity>
 </application>
 <uses-sdk android:minSdkVersion="4" />
</manifest>

확인하기 편하도록 화면에는 간단한 이미지를 출력하고 가속도에 따라 위치를 변경시키도록 하였다.

package com.babukuma.android.test;

import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
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;

public class SensorActivity extends Activity implements SensorEventListener {
 private static final String LOG_TAG = "BABUKUMA";

 private SensorManager sensorManager;
 private SensorView sensorView;

 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  sensorView = new SensorView(this);
  setContentView(sensorView);

  getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);

  sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);

  // 加速度センサー
  List<Sensor> sensors = sensorManager
    .getSensorList(Sensor.TYPE_ACCELEROMETER);
  if (sensors.size() > 0) {
   sensorManager.registerListener(this, sensors.get(0),
     SensorManager.SENSOR_DELAY_GAME);
  }
 }

 @Override
 protected void onDestroy() {
  super.onDestroy();
  sensorManager.unregisterListener(this);
 }

 @Override
 public void onAccuracyChanged(final Sensor sensor, int accuracy) {
  // TODO Auto-generated method stub
 }

 @Override
 public void onSensorChanged(final SensorEvent event) {
  Sensor sensor = event.sensor;
  switch (sensor.getType()) {
  case Sensor.TYPE_ACCELEROMETER:
   // Log.d(LOG_TAG, "ACCELEROMETER : " + event.values[0] + ","
   // + event.values[1] + "," + event.values[2]);
   sensorView.move(event.values[0], event.values[1]);

   break;
  default:
   break;
  }
 }

 class SensorView extends View {
  private static final int KUMA_SIZE = 50;
  private Bitmap kuma;
  private int w;
  private int h;
  private float x;
  private float y;

  public SensorView(Context context) {
   super(context);
   requestWindowFeature(Window.FEATURE_NO_TITLE);
   kuma = BitmapFactory.decodeResource(context.getResources(),
     R.drawable.icon_kuma_50);
  }

  /**
   * クマを移動する。
   * 
   * @param mx
   * @param my
   */
  public void move(float mx, float my) {
   this.x -= (mx * 4f);
   this.y += (my * 4f);

   if (this.x < 0) {
    this.x = 0;
   } else if ((this.x + KUMA_SIZE) > this.w) {
    this.x = this.w - KUMA_SIZE;
   }

   if (this.y < 0) {
    this.y = 0;
   } else if ((this.y + KUMA_SIZE) > this.h) {
    this.y = this.h - KUMA_SIZE;
   }

   invalidate();
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
   this.w = w;
   this.h = h;
   this.x = (w - KUMA_SIZE) / 2f;
   this.y = (h - KUMA_SIZE) / 2f;
  }

  @Override
  protected void onDraw(Canvas canvas) {
   canvas.drawBitmap(kuma, x, y, null);
  }
 }
}