SD卡存储

/**
* 判断SDCard是否存在 [当没有外挂SD卡时，内置ROM也被识别为存在sd卡]
*
* @return
*/
public static boolean isSdCardExist() {
return Environment.getExternalStorageState().equals(
Environment.MEDIA_MOUNTED);
}

/**
* 获取SD卡根目录路径
*
* @return
*/
public static String getSdCardPath() {
boolean exist = isSdCardExist();
String sdpath = "";
if (exist) {
sdpath = Environment.getExternalStorageDirectory()
.getAbsolutePath();
} else {
sdpath = "不适用";
}
return sdpath;

}

//将资源图片存到本地

public void writeFile(){    try {        File file = new File(getCacheDir().getAbsolutePath()+                "/renlian.jpg");        Bitmap bitmap=BitmapFactory.decodeResource(getResources(),R.mipmap.a);        savePic(bitmap,file);    } catch (Exception e) {        e.printStackTrace();    }}

/** * 保存图片到本地 * * @param b * @param filePath */private void savePic(Bitmap b, File filePath) {    FileOutputStream fos = null;    try {        fos = new FileOutputStream(filePath);        if (null != fos) {            b.compress(Bitmap.CompressFormat.PNG, 100, fos);            fos.flush();            fos.close();            main();        }    } catch (FileNotFoundException e) {        // e.printStackTrace();    } catch (IOException e) {        // e.printStackTrace();    }}