Android 文件的读写（内置存储卡）

 private final static String ALBUM_PATH= Environment.getExternalStorageDirectory().toString();
private final static String BIT_NAME = "/ucast.bmp";
 File dirFile = new File(ALBUM_PATH);
            if (!dirFile.exists()) {
                dirFile.mkdir();
            }
            File myCaptureFile = new File(ALBUM_PATH + BIT_NAME);

            FileOutputStream fileos = new FileOutputStream(myCaptureFile);

记得权限   

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" /><uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />