In my doInBackground method i am trying to create a HTTPGet and creating a JSONResponseHandler than passing both of them into mClient.execute(). The application crashed in the doInBackgroundMethod. Any help would be great. And I am fairly new to Android, which may explain some of my coding practices here. Here is my code:
public class Downloader extends AsyncTask <String, Void, List<Bitmap>>{
private static final String URL = "http://......";
private MainActivity mParentActivity;
private Context mApplicationContext;
AndroidHttpClient mClient = AndroidHttpClient.newInstance("");
// Constructor
public Downloader(MainActivity parentActivity) {
super();
mParentActivity = parentActivity;
mApplicationContext = parentActivity.getApplicationContext();
}
@Override
protected List<Bitmap> doInBackground(String... params) {
log("Entered doInBackground()");
HttpGet request = new HttpGet(URL);
JSONResponseHandler responseHandler = new JSONResponseHandler();
try {
return mClient.execute(request, responseHandler);
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(List<Bitmap> result)
{
mParentActivity.setImages(result);
}
private void log(String msg)
{
Log.i(TAG, msg);
}
private class JSONResponseHandler implements ResponseHandler<List<Bitmap>> {
private static final String IMAGE = "cover";
private static final String LIST = "data";
@Override
public List<Bitmap> handleResponse(HttpResponse response)
throws ClientProtocolException, IOException {
List<Bitmap> result = new ArrayList<Bitmap>();
String JSONResponse = new BasicResponseHandler()
.handleResponse(response);
try {
// Get top-level JSON Object - a Map
JSONObject responseObject = (JSONObject) new JSONTokener(
JSONResponse).nextValue();
// Extract value of "Data" key -- a List
JSONArray images = responseObject
.getJSONArray(LIST);
InputStream is = null;
// Iterate over data list
for (int idx = 0; idx < images.length(); idx++) {
// Get single piece of data - a Map
JSONObject image = (JSONObject) images.get(idx);
// open the url
URL coverURL = (java.net.URL) image.get(IMAGE);
HttpURLConnection conn = (HttpURLConnection) coverURL.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
conn.setDoInput(true);
// Starts the query
conn.connect();
int r = conn.getResponseCode();
Log.d(TAG, "The response is: " + r);
is = conn.getInputStream();
// creates an image from the inputStream
Bitmap imageMap = BitmapFactory.decodeStream(is);
result.add(imageMap);
}
} catch (JSONException e) {
e.printStackTrace();
}
return result;
}
}
}
My LogCat is as follows:
02-27 21:37:32.540: E/AndroidRuntime(1536): FATAL EXCEPTION: AsyncTask #1
02-27 21:37:32.540: E/AndroidRuntime(1536): Process: com.example.test, PID: 1536
02-27 21:37:32.540: E/AndroidRuntime(1536): java.lang.RuntimeException: An error occured while executing doInBackground()
02-27 21:37:32.540: E/AndroidRuntime(1536): at android.os.AsyncTask$3.done(AsyncTask.java:300)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.util.concurrent.FutureTask.run(FutureTask.java:242)
02-27 21:37:32.540: E/AndroidRuntime(1536): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
02-27 21:37:32.540: E/AndroidRuntime(1536): at java.lang.Thread.run(Thread.java:841)
02-27 21:37:32.540: E/AndroidRuntime(1536): Caused by: java.lang.ClassCastException: java.lang.String cannot be cast to java.net.URL
02-27 21:37:32.540: E/AndroidRuntime(1536): at com.example.test.DownloadStories$JSONResponseHandler.handleResponse(DownloadStories.java:109)
02-27 21:37:32.540: E/AndroidRuntime(1536): at com.example.test.DownloadStories$JSONResponseHandler.handleResponse(DownloadStories.java:1)
02-27 21:37:32.540: E/AndroidRuntime(1536): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:657)
02-27 21:37:32.540: E/AndroidRuntime(1536): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:627)
02-27 21:37:32.540: E/AndroidRuntime(1536): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:616)
02-27 21:37:32.540: E/AndroidRuntime(1536): at android.net.http.AndroidHttpClient.execute(AndroidHttpClient.java:273)
add below line into your downloader constructor,
mClient = AndroidHttpClient.newInstance("", mApplicationContext);
I think you have to pass your context to get Instance.
I believe your code is crashing as it is running out of memory during this line
Bitmap imageMap = BitmapFactory.decodeStream(is);
result.add(imageMap);
But what I'm not able to understand is why are you not saving the picture to a particular location during that step and releasing the memory
void downloadFile(String fileUrl, String fileName) {
URL myFileUrl = null;
try {
myFileUrl = new URL(fileUrl);
HttpURLConnection conn = (HttpURLConnection) myFileUrl.openConnection();
conn.setDoInput(true);
conn.connect();
InputStream is = conn.getInputStream();
if (bmImg != null) {
bmImg.recycle();
}
bmImg = BitmapFactory.decodeStream(is);
FileOutputStream out = new FileOutputStream(path + "/" + fileName + ".jpg");
bmImg.compress(Bitmap.CompressFormat.JPEG, 50, out);
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
// Toast.makeText(this, e.getMessage(), Toast.LENGTH_LONG).show();
}
}
Hence by this step you don't need to create List<Bitmap>
which I'm assuming the reason behind the crash of the application
as in Log:
Permission denied (missing INTERNET permission?
Add INTERNET
permission in AndroidManifest
as:
<uses-permission android:name="android.permission.INTERNET" />
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.