完美解决android M上锁屏情况下,禁止pc通过MTP访问手机存储单元

final KeyguardManager keyguardManager = (KeyguardManager) getSystemService(        Context.KEYGUARD_SERVICE);mMtpDisabled = (keyguardManager.isKeyguardLocked() && keyguardManager.isKeyguardSecure()) || !mUnlocked || !isCurrentUser;

+  private final BroadcastReceiver mReceiver = new BroadcastReceiver() {+    @Override+    public void onReceive(Context context, Intent intent) {+      final String action = intent.getAction();+      if (Intent.ACTION_USER_PRESENT.equals(action)) {+        // If the media scanner is running, it may currently be calling+        // sendObjectAdded/Removed, which also synchronizes on mBinder+        // (and in addition to that, all the native MtpServer methods+        // lock the same Mutex). If it happens to be in an mtp device+        // write(), it may block for some time, so process this broadcast+        // in a thread.+        new Thread(new Runnable() {+          @Override+          public void run() {+            synchronized (mBinder) {+              // Unhide the storage units when the user has unlocked the lockscreen+              if (mMtpDisabled) {+                addStorageDevicesLocked();+                mMtpDisabled = false;+              }+            }+          }}, "addStorageDevices").start();+      }+    }+  };