<?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:gravity="center_vertical" android:orientation="horizontal" android:minHeight="?android:attr/listPreferredItemHeight" android:padding="16dp"> <ImageView android:id="@+id/list_item_icon" android:layout_width="50dp" android:layout_height="50dp" /> <LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" andorid:layout_weight="1" android:orientation="vertical" android:padding="16dp"> <TextView android:id="@+id/version_name" android:layout_width="wrap_content" android:layout_height="wrap_content" /> <TextView android:id="@+id/version_name" android:layout_width="wrap_content" android:layout_height="wrap_content" /> </LinearLayout> </LinearLayout>
USGS earthquake API parameters
USGS earthquake API parameters
parameter name: description
mag: short for “magnitude”
place: where the earthquake occurred
time: when the earthquake occurred
felt: how strong this quake was felt
tsunami: was there a tsunami alert issued?
title: the title of the quake (mag + place)
coordinates: where the earthquake occured (long, lat, depth)
package com.example.android.quakereport; import android.os.Bundle; import android.support.v7.app.AppCompactActivity; import android.widget.ArrayAdapter; import android.widget.ListView; import java.util.ArrayList; public class EarthquakeActivity extends AppCompactActivity { public static final String LOG_TAG = EarthquakeActivity.class.getName(); @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.earthquake_activity); ArrayList<String> earthquakes = new ArrayList<>(); earthquakes.add("San Fransisco"); earthquakes.add("London"); earthquakes.add("Tokyo"); earthquakes.add("Mexico City"); earthquakes.add("Moscow"); earthquakes.add("Rio de Janeiro"); earthquakes.add("Paris"); ListView earthquakeListView = (ListView) findViewById(R.id.list); ArrayAdapter<String> adapter = new ArrayAdapter<String>( this, android.R.layout.simple_list_item_1, earthquakes); earthquakeListView.setAdapter(adapter); } }
USGS spreadsheet format
https://earthquake.usgs.gov/earthquakes/feed/v1.0/csv.php
real-time data provided by USGS in spreadsheet format, most useful data in app.
date, latitude, longitude, depth, magnitude, place, type
For Developers API documentation
https://earthquake.usgs.gov/fdsnws/event/1/
Get geojson data from query and parameter
https://earthquake.usgs.gov/fdsnws/event/1/query?starttime=2017-04-29&endtime=2017-04-30&format=geojson
json pretty print
http://jsonprettyprint.com/
-time is unix timestamp
more than 4.5 magnitude
https://earthquake.usgs.gov/fdsnws/event/1/query?starttime=2017-04-29&endtime=2017-04-30&format=geojson&minmagnitude=4.5
Better Practice for User Interface
Best practices for User Interface
https://developer.android.com/training/best-ui.html
-Designing for Multiple Screens
How to build a user interface that’s flexible enough to fit perfectly on any screen and how to create different interaction patterns that are optimized for different screen sizes.
-Build a Responsible UI with ConstraintLayout
How to build a layout using ConstraintLayout and the Android Studio Layout Editor.
-Adding the App Bar
How to use the support library’s toolbar widget to implement an app bar that displays properly on a wide range of devices.
-Showing Pop-Up Message
How to use the support library’s Snackbar widget to display a brief pop-up message.
-Creating Custom Views
How to build custom UI widgets that are interactive and smooth.
-Creating Backword-Compatible UIs
How to use UI components and other APIs from the more recent versions of Android while remaining compatible with older versions of the platform.
-Implementing Accessibility
How to make your app accessible to users with vision impairment or other physical disabilities.
-Managing the System UI
How to hide and show status and navigation bars across different versions of Android, while managing the display of other screen components.
-Creating Apps with Material Design
How to implement material design on Android.
Earthquake data api
Where are some possible places to find earthquake data?
-USGA is geological survey
https://earthquake.usgs.gov/fdsnws/event/1/
http://www.seismi.org/api/
https://earthquake.usgs.gov/
https://www.programmableweb.com/category/earthquakes/api
http://www.j-shis.bosai.go.jp/api-list
Creating data sources
customer segment -> group by
customer_ID -> count
name oreder
Descending, Ascending
data type:string, numeric, boolean
Alteryx
Alteryx: here we go
https://pages.alteryx.com/free-trial.html
sources of data
-transactional, devices, collected
categories of data
-structured, unstructured, semi-structured
structured data
-columns(fields) and rows
Scientific notation
Scientific notation
16777216
-> 16,000,000
2,000,000,000,000
-> 2trillion
6.37 x 10^-3
a x 10^exponent
Vertical Layouts
Label, imageView, Button
One Whole: numerator / denominator
Recipracal
repeated multiplication base^exponent
3^0 = 1
4^-1 = 1/4
4^-2 = 1/16
4^-3 = 1/56
be care for negative exponent
-(1/3)^-2
a cell divides into 4 cells after 2hours. how many cells are there after one day?
4^12 = 16777216
Anatomy of a Constrain
Y = ax + b
stackView seen same screen
Compression Resistance
Label, TextField, Button, Slider, ImageView