一个用来设置警示View 的呼吸式背景颜色的工具类BreathingViewHelper

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一个简单的小工具类，用来设置警示 View 的呼吸式背景颜色

import android.graphics.Color;import android.os.AsyncTask;import android.os.Build;import android.view.View;import java.util.Date;/** * 一个简单的小工具类，用来设置警示 View 的呼吸式背景颜色 *  * https://github.com/drakeet/BreathingViewHelper * * Created by drakeet on 6/12/15. */public class BreathingViewHelper {    private static AsyncTask<Void, Integer, Void> mAsyncTask;    private static int mColor;    private static boolean mCancelled;    public static void setBreathingBackgroundColor(final View view, final int color) {        Date firstDate = new Date();        final long firstTime = firstDate.getTime();        mAsyncTask = new AsyncTask<Void, Integer, Void>() {            int n = 1, t = 3000;            boolean increaseN;            @Override protected Void doInBackground(Void... params) {                while (!isCancelled() || !mCancelled) {                    Date currentDate = new Date();                    long diffTime = currentDate.getTime() - firstTime;                    if (diffTime > n * t) {                        increaseN = true;                    }                    if (increaseN) {                        n++;                        increaseN = false;                    }                    double y = getBreathingY(diffTime, n, t);                    int alpha = (int) ((y * 0.618f + 0.382f) * 255);                    int resultColor = setAlphaComponent(color, alpha);                    mColor = resultColor;                    publishProgress(resultColor);                    try {                        Thread.sleep(38);                    } catch (InterruptedException e) {                        e.printStackTrace();                    }                }                return null;            }            @Override protected void onProgressUpdate(Integer... values) {                super.onProgressUpdate(values);                view.setBackgroundColor(values[0]);            }        };        executeAsyncTask(mAsyncTask);    }    public static void stopBreathingBackgroundColor(View view) {        if (mAsyncTask != null) { BreathingViewHelper.mAsyncTask.cancel(true); }        else { mCancelled = true; }        smoothToOrigin(view);    }    @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 getBreathingY(long time, int n, int t) {        float k = 1.0f / 3;        float pi = 3.1415f;        float x = time / 1000.0f;        t = (int) (t / 1000.0f);        if (x >= ((n - 1) * t) && x < ((n - (1 - k)) * t)) {            double i = pi / (k * t) * ((x - (0.5f * k * t)) - (n - 1) * t);            return 0.5f * Math.sin(i) + 0.5f;        }        else if (x >= ((n - (1 - k)) * t) && x < n * t) {            double j = pi / ((1 - k) * t) * ((x - (0.5f * (3 - k) * t)) - (n - 1) * t);            double one = 0.5f * Math.sin(j) + 0.5f;            return one * one;        }        return 0;    }    private static double getSinY(long time) {        return 0.5f * Math.sin(3 * time / 1000.0f) + 0.5;    }    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]);                    }                });    }    public static void smoothToTransparentFromColor(final View view, final int color) {        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 * Color.alpha(color));                            int resultColor = setAlphaComponent(color, 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]);                    }                });    }    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);    }}

用法：

//一个简单的小工具类，用来设置警示 View 的呼吸式背景颜色View nav_header = findViewById(R.id.nav_header);BreathingViewHelper.setBreathingBackgroundColor(nav_header, Color.parseColor("#f36c60"));nav_header.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View v) {BreathingViewHelper.stopBreathingBackgroundColor(v);}});

Android从顶部显示一个Snackbar：TSnackBar
http://www.open-open.com/lib/view/open1446621175092.html

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