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stringObservable()
.subscribe(new Subscriber<String>() {
    @Override
    public void onCompleted() {

    }

    @Override
    public void onError(Throwable e) {

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public class Result {

//    "result": {
//        "limit": 10000,
//        "offset": 0,
//        "count": 1,
//        "sort": "",
    int limit;
    int offset;
    int count;

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package com.parkinglot.week11;

import android.os.AsyncTask;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

import com.google.gson.Gson;

import org.json.JSONArray;

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public class RecyclerViewActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_recycler_view);

        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerView);

        RecyclerView.LayoutManager linearLayoutManager =

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compile 'com.android.support:recyclerview-v7:24.2.1'

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public class ListViewActivity extends AppCompatActivity{

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_list_view);

        //step1 findViewById
        ListView listView = (ListView) findViewById(R.id.listView);

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public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        //Step1 findViewById
        Spinner spinner = (Spinner) findViewById(R.id.spinner);
        //Step2 Prepare Data

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public class DemoActivity extends AppCompatActivity{

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.ui_test);

        TextView textView = (TextView) findViewById(R.id.textView);

        textView.setText("set text");

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="8dp"
    android:orientation="horizontal">

    <ImageView
        android:src="@mipmap/ic_launcher"
        android:layout_width="wrap_content"

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WifiManager wifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);
Log.d(TAG, "onCreate: " + wifiManager.getDhcpInfo().toString());