判断Nand是否挂载好以及系统是否正在扫描media的程序片段

if(android.os.Environment.getStorageState(Environment.getNandStorageDirectory().getPath()).equals(
android.os.Environment.MEDIA_MOUNTED)){

}else{
Toast.makeText(this, getResources().getString(R.string.preparing_sd), Toast.LENGTH_LONG).show();
finish();
return;
}

if( ImageManager.isMediaScannerScanning(getContentResolver()) ) {
Toast.makeText(this, getResources().getString(R.string.preparing_sd), Toast.LENGTH_LONG).show();
finish();
return;
}