Android存bitmap到sdk卡中

   try {

    FileOutputStream out = new FileOutputStream("/sdcard/pp.png");

    CU.BG_BMP.compress(Bitmap.CompressFormat.PNG, 90, out);

   } catch (Exception e) {

    e.printStackTrace();

   }

记得要加上  <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>