JCUtils.java

package fm.jiecao.jcvideoplayer_lib;

import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.view.ContextThemeWrapper;

import java.util.Formatter;
import java.util.Locale;

/**
 * Created by Nathen
 * On 2016/02/21 12:25
 */
public class JCUtils {

    public static String stringForTime(int timeMs) {
        if (timeMs <= 0 || timeMs >= 24 * 60 * 60 * 1000) {
            return "00:00";
        }
        int totalSeconds = timeMs / 1000;
        int seconds = totalSeconds % 60;
        int minutes = (totalSeconds / 60) % 60;
        int hours = totalSeconds / 3600;
        StringBuilder stringBuilder = new StringBuilder();
        Formatter mFormatter = new Formatter(stringBuilder, Locale.getDefault());
        if (hours > 0) {
            return mFormatter.format("%d:%02d:%02d", hours, minutes, seconds).toString();
        } else {
            return mFormatter.format("%02d:%02d", minutes, seconds).toString();
        }
    }

    /**
     * This method requires the caller to hold the permission ACCESS_NETWORK_STATE.
     *
     * @param context a application context
     * @return if wifi is connected,return true
     */
    public static boolean isWifiConnected(Context context) {
        ConnectivityManager connectivityManager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();
        return networkInfo != null && networkInfo.getType() == ConnectivityManager.TYPE_WIFI;
    }

    /**
     * Get activity from context object
     *
     * @param context something
     * @return object of Activity or null if it is not Activity
     */
    public static Activity scanForActivity(Context context) {
        if (context == null) return null;

        if (context instanceof Activity) {
            return (Activity) context;
        } else if (context instanceof ContextWrapper) {
            return scanForActivity(((ContextWrapper) context).getBaseContext());
        }

        return null;
    }

    /**
     * Get AppCompatActivity from context
     *
     * @param context
     * @return AppCompatActivity if it's not null
     */
    public static AppCompatActivity getAppCompActivity(Context context) {
        if (context == null) return null;
        if (context instanceof AppCompatActivity) {
            return (AppCompatActivity) context;
        } else if (context instanceof ContextThemeWrapper) {
            return getAppCompActivity(((ContextThemeWrapper) context).getBaseContext());
        }
        return null;
    }

    public static int dip2px(Context context, float dpValue) {
        final float scale = context.getResources().getDisplayMetrics().density;
        return (int) (dpValue * scale + 0.5f);
    }

}