Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import android.os.AsyncTask;
import android.os.Build;
import android.view.View;
import java.util.Date;

public class Main {
    private static int mColor;

    private static void smoothToOrigin(final View view) {
        Date firstDate = new Date();
        final long firstTime = firstDate.getTime();
        executeAsyncTask(new AsyncTask<Void, Integer, Void>() {
            int n = 1, t = 4000;
            boolean increaseN;

            @Override
            protected Void doInBackground(Void... params) {
                while (!isCancelled()) {
                    Date currentDate = new Date();
                    long diffTime = currentDate.getTime() - firstTime;

                    double y = getCosY(diffTime);
                    int alpha = (int) (y * 255);
                    int resultColor = setAlphaComponent(mColor, alpha);
                    if (alpha < 0.038 * 255) {
                        publishProgress(0);
                        this.cancel(true);
                        return null;
                    }
                    publishProgress(resultColor, alpha);
                    try {
                        Thread.sleep(38);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                }
                return null;
            }

            @Override
            protected void onProgressUpdate(Integer... values) {
                super.onProgressUpdate(values);
                view.setBackgroundColor(values[0]);
            }
        });
    }

    @SafeVarargs
    private static <Params, Progress, Result> void executeAsyncTask(AsyncTask<Params, Progress, Result> task,
            Params... params) {
        if (Build.VERSION.SDK_INT >= 11) {
            task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR, params);
        } else {
            task.execute(params);
        }
    }

    private static double getCosY(long diffTime) {
        return 0.5f * Math.cos(3 * diffTime / 1000.0f) + 0.5;
    }

    public static int setAlphaComponent(int color, int alpha) {
        if (alpha < 0 || alpha > 255) {
            throw new IllegalArgumentException("alpha must be between 0 and 255.");
        }
        return (color & 0x00ffffff) | (alpha << 24);
    }
}