用流读出来，
File sdCardDir = Environment.getExternalStorageDirectory();
File saveFile = new File(sdCardDir, path + "/" + aFileName);
FileOutputStream outStream = new FileOutputStream(saveFile,aIsApp);
BufferedReader reader = null;
reader = new BufferedReader(new FileReader(objFile));我这是sd卡上读txt文档的代码，你看看
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