使用AsyncTask调用API

Question

我正在尝试使用android studio访问流媒体/互联网API。我的API调用在不使用AsyncTask的情况下在Eclipse中工作，所以我尝试在AndroidStudio中使用AsyncTask来调用API，但我不确定它为什么不工作。我使用缓冲读取器和输入流的方式与调用工作时在eclipse中使用它们的方式相同。我也有权在我的AndroidManifest.xml中使用互联网。

注：我取出我的API密钥的原因很明显。

import android.content.Intent;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.os.AsyncTask;
import android.view.View;
import android.widget.EditText;
import android.view.View.OnClickListener;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends Activity implements OnClickListener {
private static final String TAG_DEBUG = MainActivity.class.getName();
public static final String TAG_ID = "id";
public static final String TAG_CURRENTTEMP = "currenttemp";
public static final String TAG_MAXTEMP = "maxtemp";
public static final String TAG_MINTEMP = "mintemp";
private EditText enteredzip;
private String zip;
private Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
enteredzip = (EditText) findViewById(R.id.editText);
button = (Button) findViewById(R.id.button);
button.setOnClickListener(this);
}

public void onClick(View v) {
zip = enteredzip.getText().toString();
new RetrieveFeedTask().execute();
}
class RetrieveFeedTask extends AsyncTask<Void, Void, String> {
private Exception exception;
protected void onPreExecute() {
}
protected String doInBackground(Void... urls) {
String BASE_URL = "http://api.openweathermap.org/data/2.5/weather?zip=";
String API_CALL = "&APPID=key";
// Do some validation here
HttpURLConnection con = null;
InputStream is = null;
String bufferedOutput = "";
try {
con = (HttpURLConnection) (new URL(BASE_URL + zip + API_CALL)).openConnection();
con.setRequestMethod("GET");
con.setDoInput(true);
con.setDoOutput(true);
con.connect();
StringBuffer buffer = new StringBuffer();
is = con.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line = null;
while((line = br.readLine()) != null)
buffer.append(line + "rn");
is.close();
con.disconnect();
bufferedOutput = buffer.toString();
return bufferedOutput;
}
catch(Exception e) {
Log.e("ERROR", e.getMessage(), e);
return null;
} finally {
try{
is.close();
}catch(Throwable T){}
try{
con.disconnect();
}catch(Throwable T){}
}
}
protected void onPostExecute(String response) {
if(response == null) {
//response = "THERE WAS AN ERROR";
//Toast.makeText(MainActivity.this, getResources().getString(R.string.error_et), Toast.LENGTH_LONG).show();
return;
}
//Log.i("INFO", response);
// TODO: check this.exception
// TODO: do something with the feed
Toast.makeText(MainActivity.this, response, Toast.LENGTH_LONG).show();
String id = "";
String currenttemp = "";
String maxtemp = "";
String mintemp = "";

for (int i = 0; i < response.length(); i++) {
if (response.substring(i, i + 2).equals("id")) {
id = response.substring(i + 4, i + 7);
break;
}
}
for (int i = 0; i < response.length(); i++) {
if (response.substring(i, i + 4).equals("temp")) {
currenttemp = response.substring(i + 6, i + 9);
break;
}
}
for (int i = 0; i < response.length(); i++) {
if (response.substring(i, i + 8).equals("temp_min")) {
mintemp = response.substring(i + 10, i + 13);
break;
}
}
for (int i = 0; i < response.length(); i++) {
if (response.substring(i, i + 8).equals("temp_max")) {
maxtemp = response.substring(i + 10, i + 13);
break;
}
}
launchMain2Activity(id, currenttemp, maxtemp, mintemp);
}
}
private void launchMain2Activity(String id, String currenttemp, String maxtemp, String mintemp) {
Intent Main2Activity = new Intent(MainActivity.this, Main2Activity.class);
Main2Activity.putExtra(TAG_ID, id);
Main2Activity.putExtra(TAG_CURRENTTEMP, currenttemp);
Main2Activity.putExtra(TAG_MAXTEMP, maxtemp);
Main2Activity.putExtra(TAG_MINTEMP, mintemp);

startActivity(Main2Activity);
}

Answer 1

尝试使用这个：

BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "UTF-8")) ; 

UTF-8是一种使用8位序列对Unicode字符进行编码的方法。