我的应用程序具有从SD卡读取文本文件的功能，当我读取小文件没有问题时，但是当我读取文本文件太大时，我得到一个OutOfMemoryError。阅读类似的问题会改变我的文本，现在使用AsyncTask来读取文件，但即便如此，我也会遇到同样的错误。
这是我的代码：
private class MiTarea extends AsyncTask<String, Integer, String > {
protected void onPreExecute() {
dialog.setProgress(0);
dialog.setMax(100);
dialog.show(); //Mostramos el diálogo antes de comenzar
}
protected String doInBackground(String... urls) {
if (carpeta_para_leer == "Textos"){
sdcard = new File( Environment.getExternalStorageDirectory().toString()+"/" + carpeta_para_leer + "/");
}else{
sdcard = new File( Environment.getExternalStorageDirectory().toString()+"/Textos/" + carpeta_para_leer + "/");
}
//Get the text file
File file = new File(sdcard, nombre_texto + ".txt");
sizeInBytes = file.length();
currentBytes = 0;
//Read text from file
StringBuilder text = new StringBuilder();
nepe = new ArrayList<String>();
try {
BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), "Cp1252"));
String line;
while ((line = br.readLine()) != null) {
line.replaceAll("\t", " ");
line.replaceAll("\n", " ");
delimitadores = " ";
String[] hola = line.split(delimitadores);
for (int i = 0; i < hola.length; i++ ){
nepe.add(hola[i]);
}
currentBytes += (long)line.length(); //HERE I TRY TO UPDATE THE PROGRESSBAR
por = (currentBytes * 50) / sizeInBytes;
publishProgress(porcent);
Log.d("DoINBackGround", "" + currentBytes + " Y EL TOTAL ES " + sizeInBytes);
}
}
catch (IOException e) {
}
Holmes1 =text.toString();
// delimitadores = " ";
// arrayHolmes1 = Holmes1.split(delimitadores);
return Holmes1;
}
protected void onProgressUpdate (Integer... valores) {
dialog.setProgress((int) ((int) (currentBytes * 100) / sizeInBytes));
Log.d("LLAMADA A PROGRESSBAR", "TOTAL: " + sizeInBytes + " LLEVAS: " + currentBytes + " PORCENTAJE: " + currentBytes/sizeInBytes + " POR: " + por );
if (dialog.getProgress() == 100){
onPostExecute(1);
}
}
protected void onPostExecute(Integer bytes) {
dialog.dismiss();
}
}
这就是logcat：
11-30 17:21:45.332 6175-6324/ccv.checkhellsing.lecturarapida E/dalvikvm-heap﹕ Out of memory on a 1787236-byte allocation.
11-30 17:21:45.449 6175-6324/ccv.checkhellsing.lecturarapida E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #1
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:200)
at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:274)
at java.util.concurrent.FutureTask.setException(FutureTask.java:125)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:308)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
at java.lang.Thread.run(Thread.java:1019)
Caused by: java.lang.OutOfMemoryError
at java.util.ArrayList.add(ArrayList.java:123)
at ccv.checkhellsing.lecturarapida.EL_Entrenamiento$MiTarea.doInBackground(EL_Entrenamiento.java:1262)
at ccv.checkhellsing.lecturarapida.EL_Entrenamiento$MiTarea.doInBackground(EL_Entrenamiento.java:1224)
at android.os.AsyncTask$2.call(AsyncTask.java:185)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
at java.lang.Thread.run(Thread.java:1019)
11-30 17:21:45.925 6175-6175/ccv.checkhellsing.lecturarapida E/WindowManager﹕ Activity ccv.checkhellsing.lecturarapida.EL_Entrenamiento has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405b43e0 that was originally added here
android.view.WindowLeaked: Activity ccv.checkhellsing.lecturarapida.EL_Entrenamiento has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView@405b43e0 that was originally added here
at android.view.ViewRoot.<init>(ViewRoot.java:258)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:148)
at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91)
at android.view.Window$LocalWindowManager.addView(Window.java:424)
at android.app.Dialog.show(Dialog.java:241)
at ccv.checkhellsing.lecturarapida.EL_Entrenamiento$MiTarea.onPreExecute(EL_Entrenamiento.java:1229)
at android.os.AsyncTask.execute(AsyncTask.java:391)
at ccv.checkhellsing.lecturarapida.EL_Entrenamiento.onClick(EL_Entrenamiento.java:497)
at android.view.View.performClick(View.java:2485)
at android.view.View$PerformClick.run(View.java:9081)
at android.os.Handler.handleCallback(Handler.java:587)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:123)
at android.app.ActivityThread.main(ActivityThread.java:3683)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
at com.android.internal.os.ZygoteInit.main(Native Method)
at dalvik.system.NativeStart.main(Native Method)
11-30 17:21:53.386 6325-6334/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:21:53.386 6325-6334/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:21:53.386 6325-6334/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:22:59.246 6325-6334/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:22:59.246 6325-6334/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:22:59.246 6325-6334/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:24:03.941 6325-6331/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:24:03.941 6325-6331/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:24:03.941 6325-6331/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:24:53.450 1255-6344/? E/GTalkService﹕ createConnection: missing account.authToken...
11-30 17:24:57.638 6402-6402/? E/dalvikvm﹕ Could not find class 'android.database.sqlite.SQLiteCantOpenDatabaseException', referenced from method com.google.android.gms.plus.provider.PlusProvider.a
11-30 17:24:57.865 6325-6330/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:24:57.865 6325-6330/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:24:57.865 6325-6330/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:25:03.372 1255-6412/? E/GTalkService﹕ createConnection: missing account.authToken...
11-30 17:25:04.474 6402-6415/? E/dalvikvm﹕ Could not find class 'android.app.AppOpsManager', referenced from method axo.a
11-30 17:25:05.216 6325-6334/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:25:05.224 6325-6334/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:25:05.224 6325-6334/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:26:11.779 6325-6331/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:26:11.779 6325-6331/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:26:11.779 6325-6331/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:27:17.700 6325-6331/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:27:17.700 6325-6331/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:27:17.700 6325-6331/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:28:22.638 6325-6334/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:28:22.638 6325-6334/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:28:22.638 6325-6334/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:29:27.544 6325-6334/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:29:27.544 6325-6334/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:29:27.544 6325-6334/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:30:31.990 6325-6331/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:30:31.990 6325-6331/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:30:31.997 6325-6331/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:31:37.779 6325-6331/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:31:37.786 6325-6331/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:31:37.786 6325-6331/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:32:01.146 1114-1142/? E/ResourceType﹕ Style contains key with bad entry: 0x010102f0
11-30 17:32:03.443 6540-6540/ccv.checkhellsing.lecturarapida E/ResourceType﹕ Style contains key with bad entry: 0x010102f0
11-30 17:32:08.341 6540-6540/ccv.checkhellsing.lecturarapida E/ResourceType﹕ Style contains key with bad entry: 0x010102f0
11-30 17:32:08.982 6402-6543/? E/dalvikvm﹕ Could not find class 'android.os.UserManager', referenced from method aod.b
11-30 17:32:08.982 6402-6543/? E/dalvikvm﹕ Could not find class 'android.os.UserManager', referenced from method aod.c
11-30 17:32:08.990 6402-6543/? E/dalvikvm﹕ Could not find class 'android.os.UserManager', referenced from method aod.d
11-30 17:32:49.732 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:32:49.732 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:32:49.732 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:33:56.411 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:33:56.411 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:33:56.411 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:35:01.396 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:35:01.404 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:35:01.404 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:36:05.716 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:36:05.716 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:36:05.716 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:37:10.021 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:37:10.021 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:37:10.021 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:38:14.255 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:38:14.255 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:38:14.255 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:39:18.544 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:39:18.544 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:39:18.544 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:40:22.810 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:40:22.810 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:40:22.810 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:41:27.094 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:41:27.094 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:41:27.094 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:41:48.555 1255-6677/? E/GTalkService﹕ createConnection: missing account.authToken...
11-30 17:41:52.766 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:41:52.766 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:41:52.766 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:41:53.180 1255-6735/? E/GTalkService﹕ createConnection: missing account.authToken...
11-30 17:42:02.281 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:42:02.289 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:42:02.289 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:43:10.281 6657-6663/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:43:10.281 6657-6663/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:43:10.281 6657-6663/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
11-30 17:44:16.438 6657-6662/? E/CursorWindow﹕ need to grow: mSize = 1048576, size = 119, freeSpace() = 81, numRows = 4188
11-30 17:44:16.438 6657-6662/? E/CursorWindow﹕ not growing since there are already 4188 row(s), max size 1048576
11-30 17:44:16.438 6657-6662/? E/Cursor﹕ Failed allocating 119 bytes for text/blob at 4187,3
我该如何解决？
答案 0 :(得分：0)
您正在使用已经逐字节读取文件的InputStreamReader类。问题是由不能支持bug文件大小的BufferedReader引起的。
尝试使用setChunkedStreamingMode（1024）将数据块化为特定大小，这样就不需要将整个文件保留在内存中。
了解更多详情：Upload large file in Android without outofmemory error
祝你好运。