public class TopMovie extends Activity {
GridView lv;
Vibrator vibrator;
private Object params;
public static String movie_Id;
@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
Log.i("Category", MainActivity.movie_Category);
setContentView(R.layout.new_movie);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.customtoast,
(ViewGroup) findViewById(R.id.custom_toast_layout));
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0);
toast.setView(view);
toast.show();
vibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
lv = (GridView) findViewById(R.id.grid_view);
// URL to the JSON data
String strUrl = "http://vaibhavtech.com/work/android/movie_list.php?category="
+ MainActivity.movie_Category + "&sub_category=other";
DownloadTask downloadTask = new DownloadTask();
downloadTask.execute(strUrl);
lv.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
long arg3) {
// // TODO Auto-generated method stub
vibrator.vibrate(40);
LayoutInflater inflater = getLayoutInflater();
View view = inflater.inflate(R.layout.customtoast,
(ViewGroup) findViewById(R.id.custom_toast_layout));
Toast toast = new Toast(getApplicationContext());
toast.setDuration(Toast.LENGTH_LONG);
toast.setGravity(Gravity.CENTER_HORIZONTAL, 0, 0);
toast.setView(view);
toast.show();
MainActivity.movie_Id = ((TextView) arg1
.findViewById(R.id.tv_girdview_content_id)).getText()
.toString();
Log.i("Name is", MainActivity.movie_Id);
startActivity(new Intent(TopMovie.this, MovieDescription.class));
}
});
}
private String downloadUrl(String strUrl) throws IOException {
String data = "";
InputStream iStream = null;
try {
URL url = new URL(strUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
BufferedReader br = new BufferedReader(new InputStreamReader(
iStream));
StringBuffer sb = new StringBuffer();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line);
}
data = sb.toString();
br.close();
} catch (Exception e) {
Log.d("Exception while downloading url", e.toString());
} finally {
iStream.close();
}
return data;
}
/** AsyncTask to download json data */
private class DownloadTask extends AsyncTask<String, Integer, String> {
String data = null;
@Override
protected String doInBackground(String... url) {
try {
data = downloadUrl(url[0]);
} catch (Exception e) {
Log.d("Background Task", e.toString());
}
return data;
}
@Override
protected void onPostExecute(String result) {
// The parsing of the xml data is done in a non-ui thread
ListViewLoaderTask listViewLoaderTask = new ListViewLoaderTask();
// Start parsing xml data
listViewLoaderTask.execute(result);
}
}
/** AsyncTask to parse json data and load ListView */
private class ListViewLoaderTask extends
AsyncTask<String, Void, SimpleAdapter> {
JSONObject jObject;
// Doing the parsing of xml data in a non-ui thread
@Override
protected SimpleAdapter doInBackground(String... strJson) {
try {
jObject = new JSONObject(strJson[0]);
MovieParser countryJsonParser = new MovieParser();
countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("JSON Exception1", e.toString());
}
// Instantiating json parser class
MovieParser countryJsonParser = new MovieParser();
// A list object to store the parsed countries list
List<HashMap<String, Object>> countries = null;
try {
// Getting the parsed data as a List construct
countries = countryJsonParser.parse(jObject);
} catch (Exception e) {
Log.d("Exception", e.toString());
}
// Keys used in Hashmap
String[] from = { "image", "id", "year", "duration", "name" };
// Ids of views in listview_layout
// int[] to = {
// R.id.iv_radio_data_image,R.id.tv_radio_data_id,R.id.tv_radio_data_like,R.id.tv_radio_data_rating,R.id.tv_radio_data_listner,R.id.tv_radio_data_radio_url,R.id.tv_radio_data_name};
int[] to = { R.id.iv_girdview_content_image,
R.id.tv_girdview_content_id, R.id.tv_girdview_content_like,
R.id.tv_girdview_content_listner,
R.id.tv_girdview_content_name };
SimpleAdapter adapter = new SimpleAdapter(getBaseContext(),
countries, R.layout.grid_view_content, from, to);
return adapter;
}
/** Invoked by the Android on "doInBackground" is executed */
@Override
protected void onPostExecute(SimpleAdapter adapter) {
// Setting adapter for the listview
lv.setAdapter(adapter);
for (int i = 0; i < adapter.getCount(); i++) {
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(i);
String imgUrl = (String) hm.get("flag_path");
ImageLoaderTask imageLoaderTask = new ImageLoaderTask();
HashMap<String, Object> hmDownload = new HashMap<String, Object>();
hm.put("flag_path", imgUrl);
hm.put("position", i);
// Starting ImageLoaderTask to download and populate image in
// the listview
imageLoaderTask.execute(hm);
}
}
}
/** AsyncTask to download and load an image in ListView */
private class ImageLoaderTask extends AsyncTask<HashMap<String, Object>, Void, HashMap<String, Object>> {
@Override
protected HashMap<String, Object> doInBackground(HashMap<String, Object>... hm) {
InputStream iStream = null;
String imgUrl = (String) hm[0].get("flag_path");
int position = (Integer) hm[0].get("position");
URL url;
try {
url = new URL(imgUrl);
// Creating an http connection to communicate with url
HttpURLConnection urlConnection = (HttpURLConnection) url
.openConnection();
// Connecting to url
urlConnection.connect();
// Reading data from url
iStream = urlConnection.getInputStream();
// Getting Caching directory
File cacheDirectory = getBaseContext().getCacheDir();
// Temporary file to store the downloaded image
File tmpFile = new File(cacheDirectory.getPath() + "/wpta_"
+ position + ".png");
// The FileOutputStream to the temporary file
FileOutputStream fOutStream = new FileOutputStream(tmpFile);
// Creating a bitmap from the downloaded inputstream
Bitmap b = BitmapFactory.decodeStream(iStream);
// Writing the bitmap to the temporary file as png file
b.compress(Bitmap.CompressFormat.PNG, 100, fOutStream);
// Flush the FileOutputStream
fOutStream.flush();
// Close the FileOutputStream
fOutStream.close();
// Create a hashmap object to store image path and its position
// in the listview
HashMap<String, Object> hmBitmap = new HashMap<String, Object>();
// Storing the path to the temporary image file
hmBitmap.put("image", tmpFile.getPath());
// Storing the position of the image in the listview
hmBitmap.put("position", position);
// Returning the HashMap object containing the image path and
// position
return hmBitmap;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(HashMap<String, Object> result) {
// Getting the path to the downloaded image
String path = (String) result.get("image");
// Getting the position of the downloaded image
int position = (Integer) result.get("position");
// Getting adapter of the listview
SimpleAdapter adapter = (SimpleAdapter) lv.getAdapter();
// Getting the hashmap object at the specified position of the
// listview
HashMap<String, Object> hm = (HashMap<String, Object>) adapter
.getItem(position);
// Overwriting the existing path in the adapter
hm.put("image", path);
adapter.notifyDataSetChanged();
}
}
}
使用AsyncTask之后，我的代码中会出现异常。我做错了什么？
logcat如下：
RejectedExecutionException: Task rejected from java.util.concurrent.ThreadPoolExecutorRunning, pool size = 128, active threads = 128, queued tasks = 10, completed tasks = 4]
10-26 08:39:30.797: E/AndroidRuntime(4404): FATAL EXCEPTION: main
10-26 08:39:30.797: E/AndroidRuntime(4404): java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@411eb538 rejected from java.util.concurrent.ThreadPoolExecutor@40ce4100[Running, pool size = 128, active threads = 128, queued tasks = 10, completed tasks = 4]
10-26 08:39:30.797: E/AndroidRuntime(4404): at java.util.concurrent.ThreadPoolExecutor$AbortPolicy.rejectedExecution(ThreadPoolExecutor.java:1979)
10-26 08:39:30.797: E/AndroidRuntime(4404): at java.util.concurrent.ThreadPoolExecutor.reject(ThreadPoolExecutor.java:786)
10-26 08:39:30.797: E/AndroidRuntime(4404): at java.util.concurrent.ThreadPoolExecutor.execute(ThreadPoolExecutor.java:1307)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.AsyncTask.executeOnExecutor(AsyncTask.java:589)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.AsyncTask.execute(AsyncTask.java:534)
10-26 08:39:30.797: E/AndroidRuntime(4404): at target.mymovie.TopMovie$ListViewLoaderTask.onPostExecute(TopMovie.java:236)
10-26 08:39:30.797: E/AndroidRuntime(4404): at target.mymovie.TopMovie$ListViewLoaderTask.onPostExecute(TopMovie.java:1)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.AsyncTask.finish(AsyncTask.java:631)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.AsyncTask.access$600(AsyncTask.java:177)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:644)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.Handler.dispatchMessage(Handler.java:99)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.os.Looper.loop(Looper.java:137)
10-26 08:39:30.797: E/AndroidRuntime(4404): at android.app.ActivityThread.main(ActivityThread.java:5041)
10-26 08:39:30.797: E/AndroidRuntime(4404): at java.lang.reflect.Method.invokeNative(Native Method)
10-26 08:39:30.797: E/AndroidRuntime(4404): at java.lang.reflect.Method.invoke(Method.java:511)
10-26 08:39:30.797: E/AndroidRuntime(4404): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
10-26 08:39:30.797: E/AndroidRuntime(4404): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
10-26 08:39:30.797: E/AndroidRuntime(4404): at dalvik.system.NativeStart.main(Native Method)
10-26 08:39:33.097: I/Process(4404): Sending signal. PID: 4404 SIG: 9
10-26 08:39:34.427: E/Trace(4575): error opening trace file: No such file or directory (2)
10-26 08:39:34.977: D/dalvikvm(4575): GC_FOR_ALLOC freed 67K, 8% free 2494K/2684K, paused 33ms, total 36ms
10-26 08:39:34.997: I/dalvikvm-heap(4575): Grow heap (frag case) to 4.016MB for 1536016-byte allocation
10-26 08:39:35.107: D/dalvikvm(4575): GC_FOR_ALLOC freed 2K, 5% free 3992K/4188K, paused 104ms, total 104ms
10-26 08:39:35.157: D/dalvikvm(4575): GC_CONCURRENT freed <1K, 5% free 3992K/4188K, paused 4ms+14ms, total 52ms
10-26 08:39:35.767: D/dalvikvm(4575): GC_CONCURRENT freed 4K, 4% free 4428K/4608K, paused 73ms+4ms, total 144ms
10-26 08:39:36.067: D/gralloc_goldfish(4575): Emulator without GPU emulation detected.
答案 0 :(得分：0)
RejectedExecutionException： 当无法接受任务时，执行程序抛出异常 执行。
AsyncTask一次支持10个并发和10个排队的线程。
您在导致问题的imageLoaderTask.execute(hm);中呼叫for loop太多次，这是一种不好的做法。
相反，您可以只启动一个线程，并让它在循环中收集所有图像，并将它们全部添加到适配器中
onPostExecute。
答案 1 :(得分：0)
如果您的Executor调用shutdown方法，并且之后您将执行新的Task（Runnable），也会发生此异常。
喜欢
mThreadPoolExecutor.shutdown();
...
...
...
mThreadPoolExecutor.execute(new Runnable(){...});