Activity Class for AccelerometerDemo App on WIMM ONE

gistfile1.java

/* 
 * Copyright (C) 2012 WIMM Labs Incorporated
 */

package com.wimm.demo.accelerometerdemo;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.graphics.Color;
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 com.wimm.framework.app.LauncherActivity;

/*
 * This is a demo of accelerometer usage that will cycle the background color 
 * of a view each time a shake is detected.
 *
 */
public class AccelerometerDemoActivity extends LauncherActivity implements SensorEventListener {
    private static final String TAG = AccelerometerDemoActivity.class.getSimpleName();

    // The array of background colors to cycle through.
    private static final int[] mBackgroundColorArray = {
        Color.BLUE, Color.GREEN, Color.RED, Color.YELLOW, Color.CYAN, Color.MAGENTA };

    // An integer tracking the index of the current background color.
    private int mBackgroundColorIndex = 0;

    // The view whose background we will be changing.
    private View mTargetView = null;

    private SensorManager mSensorManager;

    // We will track the last time we changed the background color and only
    // update it again if a certain number of milliseconds has passed. This
    // will make the color changes more deterministic: one shake = one change,
    // rather than colors quickly cycling throughout shakes and stopping on
    // something random.
    private static final long MAX_COLOR_CHANGE_FREQUENCEY_MS = 500;
    
    /*
     * This threshold determine whether or not we would consider a force(measured in Gs)
     * experienced by the device to be considered a shake.
     *  
     */
    private static final long SHAKE_FORCE_THRESHOLD_IN_G = 2;
    
    private long mLastUpdateMs = 0;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        // Retrieve the view whose background color we want to change and give
        // it an initial value.
        mTargetView = findViewById(R.id.textView);
        mTargetView.setBackgroundColor(mBackgroundColorArray[mBackgroundColorIndex]);

        // Retrieve a SensorManager instance.
        mSensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);

        // The system does not disable the accelerometer automatically when the screen
        // turns off. To help save power we will listen for screen change events and
        // register/unregister for accelerometer updates accordingly.
        IntentFilter filter = new IntentFilter();
        filter.addAction("android.intent.action.SCREEN_DIM");
        filter.addAction("android.intent.action.SCREEN_ON");
        this.registerReceiver(mReceiver, filter);
    }

    //rest of code    
}