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我想从API检索天气数据作为JSON，但它不起作用。如何将天气数据（例如5天预报）转换为文本视图？如何检索json中的天气数据[android]
我的代码如下，但我需要以某种方式适应它传递JSON 5天天气预报并将其放入文本视图。
package mytweets.mytweets;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.params.BasicHttpParams;
import org.json.JSONArray;
import org.json.JSONObject;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Base64;
import android.util.Log;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
public class MytweetsActivity extends Activity {
// we are reading weathe
final String URL `enter code here`="http://api.openweathermap.org/data/2.5/forecast/daily?q,gb&mode=json&units=metric&cnt=5&APPID=xxxxxxxxxxxxxxxx";
final String Consumer_Key = "mPfkAwVuuiVYeuZWdHAMzQ"; // change this if it does not work, you can get this from your twitter account at https://dev.twitter.com/apps/new
final String Consumer_Secret = "bkmiQqellGg9jnJFj41E8zukYSNk0FX1W7v1nU376rE"; // change this if it does not work, you can get this from your twitter account at https://dev.twitter.com/apps/new
JSONArray tweets = null; //an array of tweets
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mytweets);
Button btn_token = (Button)findViewById(R.id.get_token);
btn_token.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
new GetTokenTask().execute();
}
});
Button btn_feed = (Button)findViewById(R.id.get_tweets);
btn_feed.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
TextView txt_token = (TextView)findViewById(R.id.txt_token);
String token = txt_token.getText().toString();
new GetTweetsTask().execute(token, URL);
}
});
}
protected class GetTokenTask extends AsyncTask<Void, Void, String> { // the class extends AsynTask in order to run as a thread in the background
@Override
protected String d
try {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpPost httppost = new HttpPost("https://api.twitter.com/oauth2/token"); //asks for a token
String apiString = Consumer_Key + ":" + Consumer_Secret;
String authorization = "Basic " + Base64.encodeToString(apiString.getBytes(), Base64.NO_WRAP); // twitter ants the authorization in bytes
httppost.setHeader("Authorization", authorization);
httppost.setHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF-8");
httppost.setEntity(new StringEntity("grant_type=client_credentials"));
InputStream inputStream = null;
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8); // reading the input stream
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
return sb.toString();
}catch (Exception e){
Log.e("GetTokenTask", "Error:" + e.getMessage());
return null;
}
}
@Override
protected void onPostExecute(String jsonText){
try {
JSONObject root = new JSONObject(jsonText);
String bearer_token = root.getString("access_token");
TextView txt = (TextView)findViewById(R.id.txt_token);
txt.setText(bearer_token);
}catch (Exception e){
Log.e("GetTokenTask", "Error:" + e.getMessage());
}
}
}
protected class GetTweetsTask extends AsyncTask<String, Void, String> { //the class is run as a thread in the background to get the tweets
@Override
protected String doInBackground(String... params) {
try {
DefaultHttpClient httpclient = new DefaultHttpClient(new BasicHttpParams());
HttpGet httpget = new HttpGet(params[1]);
httpget.setHeader("Authorization", "Bearer " + params[0]);
httpget.setHeader("Content-type", "application/json"); //json content type
InputStream inputStream = null;
HttpResponse response = httpclient.execute(httpget);
HttpEntity entity = response.getEntity();
inputStream = entity.getContent();
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
return sb.toString();
}catch (Exception e){
Log.e("GetFeedTask", "Error:" + e.getMessage());
return null;
}
}
@Override
protected void onPostExecute(String jsonString){
try {
TextView txt_tweets = (TextView)findViewById(R.id.txt_tweets);
JSONObject forecastJson = new JSONObject(jsonString);
JSONArray forecastArray = forecastJson.getJSONArray("list");
String txt = "";
int i;
double minTemp, maxTemp;
// we are going to parse the json string and only display created_at and text. You can decide to display more objects if you want.
for (i=0;i<tweets.length();i++)
{
JSONObject dailyForecast = forecastArray.getJSONObject(i);
JSONObject tempObject = dailyForecast.getJSONObject("temp");
minTemp = tempObject.getDouble("min");
maxTemp = tempObject.getDouble("max");
//add these minTemp and maxTemp to array or the
//way you want to use
txt_tweets.setText(txt);
txt += "------------\n"; //separtors, check the output
}
}catch (Exception e){
Log.e("GetFeedTask", "Error:" + e.getMessage());
}
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.mytweets, menu);
return true;
}
}
什么不行？什么是你得到的错误信息？ – Jens
嘿谢谢你的回复，基本上我希望5天的预测能够在文本视图中显示出来，叫做文本推文。到目前为止，我只是试图从JSOn开放天气api获取温度，然后一旦这个工作，我可以实施全天5天的天气预报。因此，请你或其他人帮助我解决如何解析和阅读json从openweather api到应用程序。谢谢 – Lewis
是的，我试图帮助。但是你的问题太广泛了。当你运行你的代码时会发生什么？你卡在哪里？ – Jens