Drag on the
TextView
to scroll it horizontally and vertically.
I don’t know why the
android:scrollHorizontally="true"
attribute of the
TextView
didn’t work;
I had to call the Java method
setHorizontallyScrolling
in
onCreate
instead.
MainActivity.java
activity_main.xml
strings.xml
AndroidManifest.xml
build.gradle
(Module: app).
I sent a query to the OpenWeatherMap server asking for the current weather in zip code 10003, which contains 7 East 12th Street. The reply I got was the following string in JSON format.
{"coord":{"lon":-74.01,"lat":40.71},"weather":[{"id":741,"main":"Fog","description":"fog","icon":"50d"}],"base":"cmc stations","main":{"temp":73.24,"pressure":1017,"humidity":88,"temp_min":69.8,"temp_max":75.2},"wind":{"speed":6.7,"deg":160},"clouds":{"all":75},"dt":1436262811,"sys":{"type":1,"id":2120,"message":0.0068,"country":"US","sunrise":1436261527,"sunset":1436315377},"id":5128581,"name":"New York","cod":200}
In the language Java,
a string literal
("Hello, world!")
requires a backslash in front of each double quote:
String jSONString = "{\"coord\":{\"lon\":-74.01,\"lat\":40.71},\"weather\":[{\"id\":741,\"main\":\"Fog\",\"description\":\"fog\",\"icon\":\"50d\"}],\"base\":\"cmc stations\",\"main\":{\"temp\":73.24,\"pressure\":1017,\"humidity\":88,\"temp_min\":69.8,\"temp_max\":75.2},\"wind\":{\"speed\":6.7,\"deg\":160},\"clouds\":{\"all\":75},\"dt\":1436262811,\"sys\":{\"type\":1,\"id\":2120,\"message\":0.0068,\"country\":\"US\",\"sunrise\":1436261527,\"sunset\":1436315377},\"id\":5128581,\"name\":\"New York\",\"cod\":200}";
5128581
is the
city id
for New York City.
For the parameters
coord,
weather,
base,
etc.,
see OpenWeatherMap’s
documentation.
For id the 741 (fog), see
Weather
Condition
Codes.
For the icon 50d (mist/day),
see the
Icon List.
1436262811 is the number of seconds since January 1, 1970. Verify this with the binary calculator in the Mac Terminal window.
bc -l scale = 5 1436262811 / (60 * 60 * 24 * 365.25) 45.51242 control-d
The
toString
method of a
JSONObject
pretty prints the content of the
JSONObject
and lets you specify the number of spaces to indent each level.
Ditto for the
toString
method of class
JSONArray.
The fields are printed in an unpredictable order.
This object contains 11 fields:
three numbers
(id,
dt,
cod),
two strings,
(name,
base),
five objects,
(clouds,
coord,
wind,
sys,
main),
and
one array
(weather).
The array consists of only one element,
which is an object containing four fields.
{
"id": 5128581,
"dt": 1436262811,
"clouds": {
"all": 75
},
"coord": {
"lat": 40.71,
"lon": -74.01
},
"wind": {
"speed": 6.7,
"deg": 160
},
"cod": 200,
"sys": {
"message": 0.0068,
"id": 2120,
"sunrise": 1436261527,
"type": 1,
"sunset": 1436315377,
"country": "US"
},
"name": "New York",
"base": "cmc stations",
"weather": [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
],
"main": {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
}
Some of the indentation is missing when the output of
Log.d
is directed to the
logcat window
of Android Studio.
But all of the indentation is present when the output of
Log.d
is directed to the standard output of
adb
as we saw in
Text.
Run the app and then type the following.
adb devices
List of devices attached
192.168.57.101:5555 device
ca1784a34445a8d0308 device
emulator-5554 device
cd
adb -s 192.168.57.101:5555 logcat -d -v raw myTag:D '*:S' > outfile
ls -l outfile
cat outfile
{
"id": 5128581,
"dt": 1436262811,
"clouds": {
"all": 75
},
"coord": {
"lat": 40.71,
"lon": -74.01
},
"wind": {
"speed": 6.7,
"deg": 160
},
"cod": 200,
"sys": {
"message": 0.0068,
"id": 2120,
"sunrise": 1436261527,
"type": 1,
"sunset": 1436315377,
"country": "US"
},
"name": "New York",
"base": "cmc stations",
"weather": [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
],
"main": {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
}
jSONString =
{"coord":{"lon":-74.01,"lat":40.71},"weather":[{"id":741,"main":"Fog","description":"fog","icon":"50d"}],"base":"cmc stations","main":{"temp":73.24,"pressure":1017,"humidity":88,"temp_min":69.8,"temp_max":75.2},"wind":{"speed":6.7,"deg":160},"clouds":{"all":75},"dt":1436262811,"sys":{"type":1,"id":2120,"message":0.0068,"country":"US","sunrise":1436261527,"sunset":1436315377},"id":5128581,"name":"New York","cod":200}
--------------------------------------------------------------
jSONbject =
{
"id": 5128581,
"dt": 1436262811,
"clouds": {
"all": 75
},
"coord": {
"lat": 40.71,
"lon": -74.01
},
"wind": {
"speed": 6.7,
"deg": 160
},
"cod": 200,
"sys": {
"message": 0.0068,
"id": 2120,
"sunrise": 1436261527,
"type": 1,
"sunset": 1436315377,
"country": "US"
},
"name": "New York",
"base": "cmc stations",
"weather": [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
],
"main": {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
}
--------------------------------------------------------------
dt = 1436262811
dt = Tuesday, July 7, 2015 5:53:31 AM EDT
main = {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
main.temp = 73.24
weather = [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
]
weather[0] = {
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
weather[0].main = Fog
weather[0].description = fog
{"coord":{"lon":-74.01,"lat":40.71},"weather":[{"id":741,"main":"Fog","description":"fog","icon":"50d"}],"base":"cmc stations","main":{"temp":73.24,"pressure":1017,"humidity":88,"temp_min":69.8,"temp_max":75.2},"wind":{"speed":6.7,"deg":160},"clouds":{"all":75},"dt":1436262811,"sys":{"type":1,"id":2120,"message":0.0068,"country":"US","sunrise":1436261527,"sunset":1436315377},"id":5128581,"name":"New York","cod":200}
into the pretty printer window at
jsonformatter.curiousconcept.com?
jSONString
from a
string
resource
in
strings.xml.
Here are two ways you can paste it in:
<string name="json">{\"coord\":{\"lon\":-74.01,\"lat\":40.71},\"weather\":[{\"id\":741,\"main\":\"Fog\",\"description\":\"fog\",\"icon\":\"50d\"}],\"base\":\"cmc stations\",\"main\":{\"temp\":73.24,\"pressure\":1017,\"humidity\":88,\"temp_min\":69.8,\"temp_max\":75.2},\"wind\":{\"speed\":6.7,\"deg\":160},\"clouds\":{\"all\":75},\"dt\":1436262811,\"sys\":{\"type\":1,\"id\":2120,\"message\":0.0068,\"country\":\"US\",\"sunrise\":1436261527,\"sunset\":1436315377},\"id\":5128581,\"name\":\"New York\",\"cod\":200}</string>
<string name="json">
{
"id": 5128581,
"dt": 1436262811,
"clouds": {
"all": 75
},
"coord": {
"lat": 40.71,
"lon": -74.01
},
"wind": {
"speed": 6.7,
"deg": 160
},
"cod": 200,
"sys": {
"message": 0.0068,
"id": 2120,
"sunrise": 1436261527,
"type": 1,
"sunset": 1436315377,
"country": "US"
},
"name": "New York",
"base": "cmc stations",
"weather": [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
],
"main": {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
}
</string>
String jSONString = getString(R.string.json);
jSONString
from a file named
response.json
in the app’s
app/res/raw
folder.
To create this folder,
select the
app/res
folder in the Android Studio
project
view
and pull down
To create a new file named
response.json,
go to the Android Studio
project
view
and select the
app/res/raw
folder you just created.
Pull down
File → New → File
New File
Enter a new file name: response.json
OK
Edit your new file
response.json
to contain either one of the following.
{"coord":{"lon":-74.01,"lat":40.71},"weather":[{"id":741,"main":"Fog","description":"fog","icon":"50d"}],"base":"cmc stations","main":{"temp":73.24,"pressure":1017,"humidity":88,"temp_min":69.8,"temp_max":75.2},"wind":{"speed":6.7,"deg":160},"clouds":{"all":75},"dt":1436262811,"sys":{"type":1,"id":2120,"message":0.0068,"country":"US","sunrise":1436261527,"sunset":1436315377},"id":5128581,"name":"New York","cod":200}
{
"id": 5128581,
"dt": 1436262811,
"clouds": {
"all": 75
},
"coord": {
"lat": 40.71,
"lon": -74.01
},
"wind": {
"speed": 6.7,
"deg": 160
},
"cod": 200,
"sys": {
"message": 0.0068,
"id": 2120,
"sunrise": 1436261527,
"type": 1,
"sunset": 1436315377,
"country": "US"
},
"name": "New York",
"base": "cmc stations",
"weather": [
{
"id": 741,
"icon": "50d",
"description": "fog",
"main": "Fog"
}
],
"main": {
"temp_min": 69.8,
"temp": 73.24,
"humidity": 88,
"pressure": 1017,
"temp_max": 75.2
}
}
In
onCreate,
create
jSONString
as follows.
String jSONString = "";
Resources resources = getResources();
InputStream inputStream = null;
try {
inputStream = resources.openRawResource(R.raw.response);
int size = inputStream.available();
byte[] buffer = new byte[size];
inputStream.read(buffer);
jSONString = new String(buffer);
} catch (Throwable throwable) {
textView.append(throwable.toString());
return;
} finally {
if (inputStream != null) {
try {
inputStream.close();
}
catch (Throwable throwable) {
textView.append(throwable.toString());
}
}
}
message,
list,
etc.,
see the OpenWeatherMap
documentation.
The JSON object contains a field named
list
which is an array of five JSON objects.
{
"message": 0.0292,
"list": [
{
"clouds": 92,
"dt": 1436288400,
"humidity": 96,
"pressure": 1011.41,
"speed": 3.69,
"deg": 168,
"weather": [
{
"id": 501,
"icon": "10d",
"description": "moderate rain",
"main": "Rain"
}
],
"temp": {
"morn": 85.21,
"min": 79.39,
"night": 79.39,
"eve": 85.96,
"max": 87.98,
"day": 85.21
},
"rain": 3.18
},
{
"clouds": 80,
"dt": 1436374800,
"humidity": 80,
"pressure": 1007.54,
"speed": 5.96,
"deg": 245,
"weather": [
{
"id": 500,
"icon": "10d",
"description": "light rain",
"main": "Rain"
}
],
"temp": {
"morn": 81.39,
"min": 73.13,
"night": 73.13,
"eve": 80.89,
"max": 84.97,
"day": 84.97
},
"rain": 1.08
},
{
"clouds": 56,
"dt": 1436461200,
"humidity": 87,
"pressure": 1009.84,
"speed": 3.05,
"deg": 162,
"weather": [
{
"id": 502,
"icon": "10d",
"description": "heavy intensity rain",
"main": "Rain"
}
],
"temp": {
"morn": 69.44,
"min": 63.3,
"night": 63.3,
"eve": 73.81,
"max": 75.83,
"day": 74.79
},
"rain": 16.8
},
{
"clouds": 0,
"dt": 1436547600,
"humidity": 63,
"pressure": 1013.03,
"speed": 4.56,
"deg": 347,
"weather": [
{
"id": 800,
"icon": "01d",
"description": "sky is clear",
"main": "Clear"
}
],
"temp": {
"morn": 65.86,
"min": 64.27,
"night": 64.27,
"eve": 72.82,
"max": 78.15,
"day": 76.89
}
},
{
"clouds": 5,
"dt": 1436634000,
"humidity": 0,
"pressure": 1016.29,
"speed": 2.31,
"deg": 298,
"weather": [
{
"id": 500,
"icon": "10d",
"description": "light rain",
"main": "Rain"
}
],
"temp": {
"morn": 70.93,
"min": 68.29,
"night": 68.29,
"eve": 76.46,
"max": 78.33,
"day": 78.33
},
"rain": 0.37
}
],
"cnt": 5,
"cod": "200",
"city": {
"coord": {
"lat": 40.714272,
"lon": -74.005966
},
"id": 5128581,
"population": 0,
"country": "US",
"name": "New York"
}
}
JSONObject jSONObject = new JSONObject(jSONString);
JSONArray list = jSONObject.getJSONArray("list");
DateFormat dateFormat = DateFormat.getDateInstance(DateFormat.FULL, Locale.getDefault());
for (int i = 0; i < list.length(); ++i) {
JSONObject day = list.getJSONObject(i);
long dt = day.getLong("dt");
JSONObject temp = day.getJSONObject("temp");
double max = temp.getDouble("max");
textView.append(max + "\u00B0 F " + dateFormat.format(1000L * dt) + "\n");
}
We should have
rounded
the maximum temperature to the nearest degree.
87.98° F Tuesday, July 7, 2015 84.97° F Wednesday, July 8, 2015 75.83° F Thursday, July 9, 2015 78.15° F Friday, July 10, 2015 78.33° F Saturday, July 11, 2015