为什么我的应用程序崩溃？它崩溃在fis.close();线上。 这是一个AsyncTask的doInBackground方法。FileInputStream崩溃.close()NPE

String collected = null;

FileInputStream fis = null;

try {

fis = openFileInput(FILENAME);

byte[] dataArray = new byte[fis.available()];

while (fis.read(dataArray) != -1) {

collected = new String(dataArray);

}

} catch (FileNotFoundException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

try {

fis.close();

return collected;

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

return null;

}

-

12-10 14:12:47.431: E/AndroidRuntime(701): FATAL EXCEPTION: AsyncTask #1

12-10 14:12:47.431: E/AndroidRuntime(701): java.lang.RuntimeException: An error occured while executing doInBackground()

12-10 14:12:47.431: E/AndroidRuntime(701): at android.os.AsyncTask$3.done(AsyncTask.java:299)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.FutureTask.run(FutureTask.java:137)

12-10 14:12:47.431: E/AndroidRuntime(701): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.lang.Thread.run(Thread.java:856)

12-10 14:12:47.431: E/AndroidRuntime(701): Caused by: java.lang.NullPointerException

12-10 14:12:47.431: E/AndroidRuntime(701): at com.ollygrov.doughpro.CustomRecipe$loadDatas.doInBackground(CustomRecipe.java:471)

12-10 14:12:47.431: E/AndroidRuntime(701): at com.ollygrov.doughpro.CustomRecipe$loadDatas.doInBackground(CustomRecipe.java:1)

12-10 14:12:47.431: E/AndroidRuntime(701): at android.os.AsyncTask$2.call(AsyncTask.java:287)

12-10 14:12:47.431: E/AndroidRuntime(701): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)

2013-12-10

Ollygrov