文件存储工具类

public class FileTools {/**写入文件操作*/public static void writeTxtFile(String FileName ,String Message){if(getExternalStorageState()){File file &＃61; new File("/sdcard/"&＃43;FileName);if(file.exists()){file.delete();}FileOutputStream out;try {out &＃61; new FileOutputStream(file);out.write(Message.getBytes());out.close();}catch (FileNotFoundException e){e.printStackTrace();LogUtil.e("error","FileNotFoundException!!");}catch (IOException e){e.printStackTrace();LogUtil.e("error","IOException!!");}}}/**读取文件操作*/public static String readTxtFile(String FileName){FileInputStream fis &＃61; null;if(getExternalStorageState()){File file &＃61; new File("/sdcard/"&＃43;FileName);if(file.exists()){try{fis &＃61; new FileInputStream(file);int len &＃61; 0;StringBuilder builder &＃61; new StringBuilder();byte[] buffer &＃61; new byte[1024];while ((len &＃61;fis.read(buffer))!&＃61;-1){builder.append(new String(buffer,0,len));
// builder.append(buffer); //这里如果这样写会是乱码&＃xff0c;因为是二进制的buffer 需要String构造一下才行
}return builder.toString();}catch (FileNotFoundException e){e.printStackTrace();LogUtil.e("error","FileNotFoundException!!");}catch (IOException e){e.printStackTrace();LogUtil.e("error","IOException!!");}}}return null;}
/**从sd卡中读取图片*/
public static Bitmap loadBitmapFromSdcard(String fileName){String path &＃61; fileName;if(getExternalStorageState()){File file &＃61; new File(path);if(file.exists()){BitmapFactory.Options options&＃61;new BitmapFactory.Options();options.inSampleSize &＃61; 2;Bitmap bmp &＃61; BitmapFactory.decodeFile(path,options);if(bmp &＃61;&＃61; null){file.delete();}else{return bmp;}}}return null;
}
/** * 判断SD卡是否可用 * */ private static boolean getExternalStorageState(){ String state &＃61; Environment.getExternalStorageState(); return state.equals(Environment.MEDIA_MOUNTED);}
}