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最新推荐文章于 2022-10-23 23:56:19 发布

原创最新推荐文章于 2022-10-23 23:56:19 发布 · 4.8k 阅读

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CC 4.0 BY-SA版权

本文介绍了一种使用传感器数据实现移动设备上物体运动模拟的方法，通过解析加速度计输出，实时调整物体的位置和方向，提供沉浸式的交互体验。

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package com.android.mypro;

import android.R.integer;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceHolder.Callback;
import android.view.SurfaceView;

public class GBall extends SurfaceView implements Callback, Runnable,
		SensorEventListener {

	private static final int TIME_IN_FRAME = 50;
	private Paint ballPaint = null;
	private SurfaceHolder surfaceHolder = null;
	private boolean running = false;
	private Canvas canvas = null;
	private SensorManager mSensorManager = null;
	private Sensor sensor = null;
	private int mWidth = 0;
	private int mHeight = 0;
	private int cx = 100;
	private int cy = 100;
	private int radius = 30;

	private float gx = 0;
	private float gy = 0;
	private float gz = 0;

	private Thread thread = null;

	private static final String TAG = "GBall";

	public GBall(Context context, SensorManager sensorManager) {
		super(context);
		// TODO Auto-generated constructor stub
		// get surfaceHolder
		surfaceHolder = this.getHolder();
		// add callback function
		surfaceHolder.addCallback(this);
		// init paint
		ballPaint = new Paint();
		ballPaint.setAntiAlias(true);
		ballPaint.setColor(Color.BLACK);

		thread = new Thread(this);
		mSensorManager = sensorManager;
		sensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		mSensorManager.registerListener(this, sensor,
				SensorManager.SENSOR_DELAY_GAME);
	}

	public void unregisterSensor() {
		mSensorManager.unregisterListener(this);
	}
	
	public void stopThread() {
		
		try {
			this.running = false;
			thread.join();
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	private void revise() {
		if (cx <= radius) {
			cx = radius;
			sx = -sx/2;
		} else if (cx >= (mWidth - radius)) {
			cx = mWidth - radius;
			sx = -sx/2;
		}

		if (cy <= radius) {
			cy = radius;
			sy = -sy/2;
		} else if (cy >= (mHeight - radius)) {
			cy = mHeight - radius;
			sy = -sy/2;
		}
	}

	protected void myDraw() {
		canvas = surfaceHolder.lockCanvas();
		// set screen to white
		canvas.drawColor(Color.WHITE);
		revise();
		canvas.drawCircle(cx, cy, radius, ballPaint);
		surfaceHolder.unlockCanvasAndPost(canvas);

	}
	
	private int sx = 0;
	private int sy = 0;

	public void run() {
		// TODO Auto-generated method stub
		while(running) {
			cx = cx + sx;
			cy = cy + sy;
			myDraw();
			try {
				Thread.sleep(20);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}

	public void surfaceChanged(SurfaceHolder holder, int format, int width,
			int height) {
		// TODO Auto-generated method stub
		Log.d(TAG, "surfaceChanged");
	}

	public void surfaceCreated(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		Log.d(TAG, "surfaceCreated");
		mWidth = getWidth();
		mHeight = getHeight();
		//+++++set background to white
		canvas = surfaceHolder.lockCanvas();
		canvas.drawColor(Color.WHITE);
		surfaceHolder.unlockCanvasAndPost(canvas);
		//-----
		running = true;
		thread.start();
	}

	public void surfaceDestroyed(SurfaceHolder holder) {
		// TODO Auto-generated method stub
		Log.d(TAG, "surfaceDestroyed");
		stopThread();
		unregisterSensor();
	}

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

	}

	public void onSensorChanged(SensorEvent event) {
		// TODO Auto-generated method stub
		gx = event.values[SensorManager.DATA_X];
		gy = event.values[SensorManager.DATA_Y];
		gz = event.values[SensorManager.DATA_Z];
		sx += -(int)gx/2;
		sy += (int)gy/2;
//		Log.d(TAG, "" + gx + " " + gy + " " + gz);
	}

}