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public static void printStackTrace() {
  System.out.println("Printing stack trace:");
  StackTraceElement[] elements = Thread.currentThread().getStackTrace();
  for (final StackTraceElement element : elements) {
    System.out.println("\tat " + element.getClassName() + "." + element.getMethodName()
                       + "(" + element.getFileName() + ":" + element.getLineNumber() + ")");
  }
}

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import android.app.Activity;
import android.content.pm.PackageManager;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AlertDialog;

public class PermissionRequest {
  private static int RC = 1;
  private final String permission;

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Daggers

Configuration

My minimal configuration would be.

AppComponent

@Singleton
@Component(modules = AppModule.class)
public interface AppComponent {

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import android.app.Activity
import android.app.Fragment
import android.content.Context
import android.content.Intent
import android.os.Bundle
import android.os.Parcelable
import android.support.annotation.VisibleForTesting
import android.support.v4.app.FragmentActivity
import android.util.SparseArray

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import android.graphics.Color;
import android.support.v7.util.DiffUtil;
import android.support.v7.widget.OrientationHelper;
import com.facebook.litho.Column;
import com.facebook.litho.ComponentContext;
import com.facebook.litho.ComponentInfo;
import com.facebook.litho.ComponentLayout;
import com.facebook.litho.annotations.LayoutSpec;
import com.facebook.litho.annotations.OnCreateLayout;

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#!/bin/bash

# Fix the CircleCI path
function install() {
  TARGET="$1"
  if [ ! -e $TARGET ]; then
    echo y | android update sdk --no-ui --all --filter $2
  else
    echo "$TARGET has installed" 
  fi

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#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

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import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatDialogFragment;
import android.util.Log;

/**

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Original solution sacrifices new api lint check.

Here my solution:

int minSdk = hasProperty('minSdk') ? minSdk.toInteger() : 16

apply plugin: 'com.android.application'

android {
 compileSdkVersion 23

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import rx.Subscription;
import rx.functions.Action1;
import rx.subjects.PublishSubject;
import rx.subjects.SerializedSubject;
import rx.subjects.Subject;

public class RxBus {

    private final Subject<Object, Object> bus = new SerializedSubject<Object, Object>(PublishSubject.create());