对SD卡的判断分静态和动态,动态通过注册广播,网上很多人都在写,这里就不做过多的阐述。对于这种静态的判断我在网上找的都是 Environment.getExternalStorageState().equals(Environment.MEDIA_MOUNTED);写代码验证之后发现判断不成功。
以下这种方法算是一种可行的判断,希望对你们有所帮助。
<pre name="code" class="java"> public static boolean USBExist(Context context) {
boolean ret = false;
StorageManager storageManager = (StorageManager) context
.getSystemService(Context.STORAGE_SERVICE);
if (storageManager == null) {
Log.e(TAG, "Invalid reference to StorageManager received.");
return ret;
}
try {
if (storageManager.getVolumeState(getUSBPath(context)).equals(
android.os.Environment.MEDIA_MOUNTED)) {
ret = true;
}
} catch (Exception e) {
Log.e(TAG, e.toString());
}
return ret;
}
public static String getSDPath(Context context) {
String sd = null;
StorageManager storageManager = (StorageManager) context
.getSystemService(Context.STORAGE_SERVICE);
StorageVolume[] volumes = storageManager.getVolumeList();
for (int i = 0; i < volumes.length; i++) {
if (volumes[i].isRemovable() && volumes[i].allowMassStorage()
&& volumes[i].getDescription(context).contains("SD")) {
sd = volumes[i].getPath();
}
}
return sd;
}
以下是对USB的判断。OTG功能一般有用到
public static boolean USBExist(Context context) {
boolean ret = false;
StorageManager storageManager = (StorageManager) context
.getSystemService(Context.STORAGE_SERVICE);
if (storageManager == null) {
Log.e(TAG, "Invalid reference to StorageManager received.");
return ret;
}
try {
if (storageManager.getVolumeState(getUSBPath(context)).equals(
android.os.Environment.MEDIA_MOUNTED)) {
ret = true;
}
} catch (Exception e) {
Log.e(TAG, e.toString());
}
return ret;
}
public static String getUSBPath(Context context) {
String usb = null;
StorageManager storageManager = (StorageManager) context
.getSystemService(Context.STORAGE_SERVICE);
StorageVolume[] volumes = storageManager.getVolumeList();
for (int i = 0; i < volumes.length; i++) {
if (volumes[i].isRemovable() && volumes[i].allowMassStorage()
&& volumes[i].getDescription(context).contains("USB")) {
usb = volumes[i].getPath();
}
}
return usb;
}