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public void copyFileOrDir(String path) {
    AssetManager assetManager = this.getAssets();
    String assets[] = null;
    try {
        assets = assetManager.list(path);
        if (assets.length == 0) {
            copyFile(path);
        } else {
            String fullPath = "/data/data/" + this.getPackageName() + "/" + path;
            File dir = new File(fullPath);

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# built application files
*.apk
*.ap_

# files for the dex VM
*.dex

# Java class files
*.class

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 int xPos = (canvas.getWidth() / 2);
 int yPos = (int) ((canvas.getHeight() / 2) - ((textPaint.descent() + textPaint.ascent()) / 2)) ; 
 //((textPaint.descent() + textPaint.ascent()) / 2) is the distance from the baseline to the center.

 canvas.drawText("Hello", xPos, yPos, textPaint);

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public abstract class CachedRefreshable<P, T> extends Refreshable<P, T> {

    protected abstract Observable<T> getSourceObservable(P parameters);

    /**
     * Return the Observable that gets data from a cached source.
     *
     * @return Observable from cache item, or null if the cache misses.
     */
    protected abstract Observable<T> getCachedObservable(P parameters);

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package com.example.widgets;

import android.content.Context;
import android.content.res.ColorStateList;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.widget.ImageView;

import com.example.R;

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in the root project's build.gradle:

ext {
  compileSdkVersion = 19
  buildToolsVersion = "19.0.1"
}

in all the android modules:

android {

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Android Cheat Sheet

Developer tips

Record a video of your app

Developer options -> Check show touches
adb shell screenrecord /sdcard/video.mp4
adb pull /sdcard/video.mp4

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import android.graphics.Color;
import android.support.design.widget.TextInputLayout;
import android.text.Editable;
import android.text.Layout;
import android.text.SpannableStringBuilder;
import android.text.Spanned;
import android.text.TextWatcher;
import android.text.style.AlignmentSpan;
import android.text.style.ForegroundColorSpan;