我创建了一个应用程序，它应该从我的thingspeak频道接收数据。 首先我只是使用了webview小部件，但我想进一步使用thingspeak java api来自己处理数据。
在MainActivity中，我只需输入代码：
Channel channel = new Channel(1234,"writeKey");
try {
Entry entry = channel.getLastChannelEntry();
} catch (UnirestException e) {
e.printStackTrace();
} catch (ThingSpeakException e) {
e.printStackTrace();
}
out.println("entry");
但是我收到以下错误：
java.lang.RuntimeException: Unable to start activity ComponentInfo{de.babytemp.babytempapp2/de.babytemp.babytempapp2.MainActivity}: java.lang.IllegalArgumentException: Unknown pattern character 'X'
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
Caused by: java.lang.IllegalArgumentException: Unknown pattern character 'X'
at java.text.SimpleDateFormat.validatePatternCharacter(SimpleDateFormat.java:314)
at java.text.SimpleDateFormat.validatePattern(SimpleDateFormat.java:303)
at java.text.SimpleDateFormat.<init>(SimpleDateFormat.java:356)
at com.google.gson.DefaultDateTypeAdapter.<init>(DefaultDateTypeAdapter.java:49)
at com.google.gson.GsonBuilder.addTypeAdaptersForDate(GsonBuilder.java:555)
at com.google.gson.GsonBuilder.create(GsonBuilder.java:543)
at de.babytemp.babytempapp2.Channel.<init>(Channel.java:46)
at de.babytemp.babytempapp2.MainActivity.onCreate(MainActivity.java:41)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
谢谢！
答案 0 :(得分：0)
package de.babytemp.babytempapp2;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.mashape.unirest.http.HttpResponse;
import com.mashape.unirest.http.JsonNode;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;
import com.mashape.unirest.request.GetRequest;
import java.util.HashMap;
public class Channel {
private String APIURL = "http://api.thingspeak.com";
private static final String APIHEADER = "XXXXXXXXX";
private final Integer channelId;
private String readAPIKey;
private String writeAPIKey;
private final Boolean isPublic;
private final HashMap<String, Object> fields = new HashMap<>();
private final Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ss").create();
/**
* Constructor for a public, read-only, Thingspeak channel. This type of
* channel cannot be updated.
*
* @param channelId Channel Id.
*/
public Channel(Integer channelId) {
this.isPublic = true;
this.channelId = channelId;
}
/**
* Constructor for a public, writeable, Thingspeak channel.
*
* @param channelId Channel Id.
* @param writeKey API Key for the channel. See
* https://thingspeak.com/channels/<channelId>#apikeys
*/
public Channel(Integer channelId, String writeKey) {
this.isPublic = true;
this.channelId = channelId;
this.writeAPIKey = writeKey;
}
/**
* Constructor for a private, writeable, Thingspeak channel.
*
* @param channelId Channel Id.
* @param writeKey Write API Key. See
* https://thingspeak.com/channels/<channelId>#apikeys.
* @param readKey Read API Key. See
* https://thingspeak.com/channels/<channelId>#apikeys.
*/
public Channel(Integer channelId, String writeKey, String readKey) {
this.channelId = channelId;
this.readAPIKey = readKey;
this.writeAPIKey = writeKey;
this.isPublic = false;
}
/**
* Make GET requests to the Thingspeak API without additional feed
* parameters.
*
* @param url The API url.
* @return JSON string.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
private String thingRequest(String url) throws UnirestException, ThingSpeakException {
GetRequest request = Unirest.get(url);
if (!this.isPublic) {
request.field("key", this.readAPIKey);
}
HttpResponse<JsonNode> response = request.asJson();
if (response.getCode() != 200) {
throw new ThingSpeakException("Request failed with code " + response.getCode());
}
return response.getBody().toString();
}
/**
* Make GET requests to the Thingspeak API with additional feed parameters.
*
* @param url The API url.
* @param options Optional feed parameters.
* @return JSON string.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
private String thingRequest(String url, FeedParameters options) throws UnirestException, ThingSpeakException {
GetRequest request = Unirest.get(url);
if (!this.isPublic) {
request.field("key", this.readAPIKey);
}
request.fields(options.fields);
HttpResponse<JsonNode> response = request.asJson();
if (response.getCode() != 200) {
throw new ThingSpeakException("Request failed with code " + response.getCode());
}
return response.getBody().toString();
}
/**
* Use a server other than thingspeak.com. If you are hosting your own
* Thingspeak server, set the url of the server here. The url of the public
* Thingspeak server is http://api.thingspeak.com
*
* @param url eg. http://localhost, http://thingspeak.local:3000, etc.
*/
public void setUrl(String url) {
this.APIURL = url;
}
/**
* Update channel with new data.
*
* @param entry The new data to be posted.
* @return The id of the new entry.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Integer update(Entry entry) throws UnirestException, ThingSpeakException {
HttpResponse<String> response = Unirest.post(APIURL + "/update")
.header(APIHEADER, this.writeAPIKey)
.header("Connection", "close")
.fields(entry.getUpdateMap())
.asString();
if (response.getCode() != 200) {
throw new ThingSpeakException("Request failed with code " + response.getCode());
} else if (response.getBody().equals("0")) {
throw new ThingSpeakException("Update failed.");
}
return Integer.parseInt(response.getBody());
}
/**
* Get a channel feed with default feed options. Does not include location or status info. Only fields that
* have been named in the channel's settings (via the web) will be returned.
*
* @return Feed for this channel.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getChannelFeed() throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/feed.json";
return gson.fromJson(thingRequest(url), Feed.class);
}
/**
* Get a channel feed with additional feed options. Only fields that have been named in
* the channel's settings (via the web) will be returned.
*
* @param options Additional feed parameters.
* @return Feed for this channel.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getChannelFeed(FeedParameters options) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/feed.json";
return gson.fromJson(thingRequest(url, options), Feed.class);
}
/**
* Get last entry in this channel with default feed options. This is a
* faster alternative to getting a Channel Feed and then calling
* {@link Feed#getChannelLastEntry()}.
*
* @return Entry.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Entry getLastChannelEntry() throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/feed/last.json";
return gson.fromJson(thingRequest(url), Entry.class);
}
/**
* Get last entry in this channel with additional feed options. This is a
* faster alternative to getting a Channel Feed and then calling
* {@link Feed#getChannelLastEntry()}
*
* @param options
* @return Entry.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Entry getLastChannelEntry(FeedParameters options) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/feed/last.json";
return gson.fromJson(thingRequest(url, options), Entry.class);
}
/**
* Get a field feed with default feed options.
*
* @param fieldId The field to include in the field (1-8).
* @return Feed.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getFieldFeed(Integer fieldId) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/field/" + fieldId + ".json";
return gson.fromJson(thingRequest(url), Feed.class);
}
/**
* Get a field feed with additional feed options.
*
* @param fieldId The field to include in the field (1-8).
* @param options Optional parameters that control the format of the feed.
* @return Feed.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getFieldFeed(Integer fieldId, FeedParameters options) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/field/" + fieldId + ".json";
return gson.fromJson(thingRequest(url, options), Feed.class);
}
/**
* Get the last entry in a field feed with default feed options.
*
* @param fieldId The field to return (0-8).
* @return Last entry for the specified field.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Entry getLastFieldEntry(Integer fieldId) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/field/" + fieldId + "/last.json";
return gson.fromJson(thingRequest(url), Entry.class);
}
/**
* Get the last entry in a field feed with additional feed options.
*
* @param fieldId The field to return (0-8).
* @param options Supported options: offset, status, and location.
* @return Last entry for the specified field.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Entry getLastFieldEntry(Integer fieldId, FeedParameters options) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/field/" + fieldId + "/last.json";
return gson.fromJson(thingRequest(url, options), Entry.class);
}
/**
* Get channel status updates. Uses the default feed options.
*
* @return Status feed.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getStatusFeed() throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/status.json";
return gson.fromJson(thingRequest(url), Feed.class);
}
/**
* Get channel status updates.
*
* @param options Only {@link FeedParameters#offset(java.lang.Integer)} is
* supported.
* @return Status feed.
* @throws UnirestException The request cannot be made.
* @throws ThingSpeakException The request is invalid.
*/
public Feed getStatusFeed(FeedParameters options) throws UnirestException, ThingSpeakException {
String url = APIURL + "/channels/" + this.channelId + "/status.json";
return gson.fromJson(thingRequest(url, options), Feed.class);
}
}
答案 1 :(得分：0)
请尝试
private final Gson gson = new GsonBuilder().setDateFormat("yyyy-MM-dd'T'HH:mm:ss").create();
到
private final Gson gson = new GsonBuilder().setDateFormat(java.text.DateFormat.LONG).create()
答案 2 :(得分：0)
FATAL EXCEPTION: main
Process: de.babytemp.babytempapp2, PID: 8731
java.lang.NoSuchFieldError: No static field INSTANCE of type Lorg/apache/http/message/BasicLineFormatter; in class Lorg/apache/http/message/BasicLineFormatter; or its superclasses (declaration of 'org.apache.http.message.BasicLineFormatter' appears in /system/framework/ext.jar)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:72)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:84)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<clinit>(ManagedHttpClientConnectionFactory.java:59)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingHttpClientConnectionManager.java:487)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:147)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:136)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:112)
at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:727)
at com.mashape.unirest.http.options.Options.refresh(Options.java:41)
at com.mashape.unirest.http.options.Options.<clinit>(Options.java:27)
at com.mashape.unirest.http.HttpClientHelper.prepareRequest(HttpClientHelper.java:142)
at com.mashape.unirest.http.HttpClientHelper.request(HttpClientHelper.java:119)
at com.mashape.unirest.request.BaseRequest.asString(BaseRequest.java:52)
at de.babytemp.babytempapp2.Channel.update(Channel.java:149)
at de.babytemp.babytempapp2.MainActivity.onCreate(MainActivity.java:47)
at android.app.Activity.performCreate(Activity.java:5990)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2278)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)
at android.app.ActivityThread.access$800(ActivityThread.java:151)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1303)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5254)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)