最近发现以前网上搜索的判断外置SD是否存在的方法在android5.1上不能使用了,上网和看源码找到了一个方法可以判断SD卡是否存在。
private boolean isExternalStorageMounted() { final StorageVolume[] volumes = mStorageManager.getVolumeList(); for (StorageVolume v : volumes) { if (v.isRemovable()) { if (Environment.MEDIA_MOUNTED.equals(Environment.getStorageState(v.getPathFile()))) return true; } } return false; }
首先要在oncreate方法里初始化mStorageManager网上别人的文档:mStorageManager = StorageManager.from(this);
此方法我验证过,可以使用。通过正规api得不到外卡路径.
谷歌在源码中给出了得到外卡路径的方法,但标记为隐藏接口,因此api无法访问.
可以通过反射接口得到:
import java.lang.reflect.Method; import android.os.storage.StorageManager; public String getPrimaryStoragePath() { try { StorageManager sm = (StorageManager) getSystemService(STORAGE_SERVICE); Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths", null); String[] paths = (String[]) getVolumePathsMethod.invoke(sm, null); // first element in paths[] is primary storage path return paths[0]; } catch (Exception e) { Log.e(TAG, "getPrimaryStoragePath() failed", e); } return null; } public String getSecondaryStoragePath() { try { StorageManager sm = (StorageManager) getSystemService(STORAGE_SERVICE); Method getVolumePathsMethod = StorageManager.class.getMethod("getVolumePaths", null); String[] paths = (String[]) getVolumePathsMethod.invoke(sm, null); // second element in paths[] is secondary storage path return 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; }
如果楼主有源码,可以去找StorageManager这个类,拉到文件最下方,就可以看到那三个隐藏接口.