这个问题太老了，这个答案可能对某人有所帮助，在我的情况下，我试图从 radio.co 的 API 获取曲目信息。
所以首先我必须添加这个类以允许我执行 HTTP 请求，将其命名为 HttpHandler：
public class HttpHandler {
private static final String TAG = HttpHandler.class.getSimpleName();
public HttpHandler() {
}
public String makeServiceCall(String reqUrl) {
String response = null;
try {
URL url = new URL(reqUrl);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
// read the response
InputStream in = new BufferedInputStream(conn.getInputStream());
response = convertStreamToString(in);
} catch (MalformedURLException e) {
Log.e(TAG, "MalformedURLException: " + e.getMessage());
} catch (ProtocolException e) {
Log.e(TAG, "ProtocolException: " + e.getMessage());
} catch (IOException e) {
Log.e(TAG, "IOException: " + e.getMessage());
} catch (Exception e) {
Log.e(TAG, "Exception: " + e.getMessage());
}
return response;
}
private String convertStreamToString(InputStream is) {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line;
try {
while ((line = reader.readLine()) != null) {
sb.append(line).append('\n');
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
is.close();
} catch (IOException e) {
e.printStackTrace();
}
}
return sb.toString();
}
}
要获取曲目信息，我已将此方法添加到我的主要活动中：
private class getTrackInfo extends AsyncTask<Void, Void, Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
//Toast.makeText(MainActivity.this,"Getting Song Info",Toast.LENGTH_LONG).show();
}
@Override
protected Void doInBackground(Void... arg0) {
HttpHandler sh = new HttpHandler();
// Making a request to url and getting response
String url = "Your URL HERE";
String jsonStr = sh.makeServiceCall(url);
//Log.e(TAG, "Response from url: " + jsonStr);
if (jsonStr != null) {
try {
JSONObject jsonObj = new JSONObject(jsonStr);
// Getting JSON Array node
JSONObject current_track = jsonObj.getJSONObject("current_track");
strArtist = current_track.getString("title");
artwork_url = current_track.getString("artwork_url");
String streamHeading = strArtist;
if (!TextUtils.isEmpty(strArtist) && strArtist.contains("-")) {
strArtist = strArtist.substring(0, strArtist.indexOf("-"));
trackData.artist = strArtist.trim();
}
if (!TextUtils.isEmpty(streamHeading)) {
if (streamHeading.contains("-")) {
strTitle = streamHeading.substring(streamHeading
.indexOf("-") + 1);
trackData.title = strTitle.trim().replace("-","");
}
}
if (!TextUtils.isEmpty(artwork_url)) {
trackData.artwork_url = artwork_url;
}
} catch (final JSONException e) {
Log.e(TAG, "Json parsing error: " + e.getMessage());
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Json parsing error: " + e.getMessage(),
Toast.LENGTH_LONG).show();
}
});
}
} else {
Log.e(TAG, "Couldn't get json from server.");
runOnUiThread(new Runnable() {
@Override
public void run() {
Toast.makeText(getApplicationContext(),
"Couldn't get json from server. Check LogCat for possible errors!",
Toast.LENGTH_LONG).show();
}
});
}
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
//Log.e(TAG, "Artist: " + trackData.artist + "\ntitle : " + trackData.title + "\nartwork_url :" + trackData.artwork_url);
//to update my user interface with the new info
songTitle.setText(trackData.title);
albumTitle.setText(trackData.artist);
new getAlbumImageTask(albumImage).execute(trackData.artwork_url);
}
}
调用这个方法：
new getTrackInfo().execute();
要加载艺术品图像，请添加此方法：
private class getAlbumImageTask extends AsyncTask<String, Void, Bitmap> {
ImageView bmImage;
public getAlbumImageTask(ImageView bmImage) {
this.bmImage = bmImage;
}
protected Bitmap doInBackground(String... urls) {
String urldisplay = urls[0];
Bitmap mIcon11 = null;
try {
InputStream in = new java.net.URL(urldisplay).openStream();
mIcon11 = BitmapFactory.decodeStream(in);
} catch (Exception e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return mIcon11;
}
protected void onPostExecute(Bitmap result) {
bmImage.setImageBitmap(result);
}
}
调用方法加载艺术品图像：
new getAlbumImageTask(albumImage).execute(trackData.artwork_url);
此代码中存在与我的情况相关的变量，然后忽略并根据您的情况调整代码
我希望这对某人有所帮助