一般是：

scard0：指系统内部存储

scard1：指外插的sd卡

也有特例。。

分别获取路径的方法：

package com.main;import java.lang.reflect.Method;import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.os.storage.StorageManager;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;public class MainActivity extends Activity {TextView tv1;TextView tv2;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);tv1 = (TextView) findViewById(R.id.tv1);tv2 = (TextView) findViewById(R.id.tv2);String str1 = getPrimaryStoragePath();String str2 = getSecondaryStoragePath();tv1.setText(str1);tv2.setText(str2);}private static final String TAG = "PhoneStatusBarPolicy";public String getPrimaryStoragePath() {try {StorageManager sm = (StorageManager) getSystemService(Context.STORAGE_SERVICE);Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths", null);String[] paths = (String[]) getVolumePathsMethod.invoke(sm, null);// first element in paths[] is primary storage pathreturn paths[0];} catch (Exception e) {Log.e(TAG, "getPrimaryStoragePath() failed", e);}return null;}public String getSecondaryStoragePath() {try {StorageManager sm = (StorageManager) getSystemService(Context.STORAGE_SERVICE);Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths", null);String[] paths = (String[]) getVolumePathsMethod.invoke(sm, null);// second element in paths[] is secondary storage pathreturn paths[1];} catch (Exception e) {Log.e(TAG, "getSecondaryStoragePath() failed", e);}return null;}public String getStorageState(String path) {try {StorageManager sm = (StorageManager) getSystemService(STORAGE_SERVICE);Method getVolumeStateMethod = StorageManager.class.getMethod("getVolumeState", new Class[] { String.class });String state = (String) getVolumeStateMethod.invoke(sm, path);return state;} catch (Exception e) {Log.e(TAG, "getStorageState() failed", e);}return null;}
}

红米手机的效果：

效果：