Add: floating window, layout inspector

app/src/main/java/com/stardust/util/FloatingWindowUtils.java

@@ -0,0 +1,43 @@
+package com.stardust.util;
+
+import android.Manifest;
+import android.content.ActivityNotFoundException;
+import android.content.Context;
+import android.content.Intent;
+import android.content.pm.PackageManager;
+import android.net.Uri;
+import android.widget.Toast;
+
+/**
+ * Created by Stardust on 2017/3/10.
+ */
+
+public class FloatingWindowUtils {
+
+    public static boolean checkFloatingWindowPermission(Context context, int messageResId) {
+        if (!isFloatingWindowPermitted(context)) {
+            Toast.makeText(context, messageResId, Toast.LENGTH_SHORT).show();
+            goToAppSetting(context);
+            return false;
+        }
+        return true;
+    }
+
+    private static void goToAppSetting(Context context) {
+        try {
+            Intent i = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
+            i.addCategory(Intent.CATEGORY_DEFAULT);
+            i.setData(Uri.parse("package:" + context.getPackageName()));
+            context.startActivity(i);
+        } catch (ActivityNotFoundException ignored) {
+
+        }
+    }
+
+    public static boolean isFloatingWindowPermitted(Context context) {
+        PackageManager pm = context.getPackageManager();
+        return pm.checkPermission(Manifest.permission.SYSTEM_ALERT_WINDOW, context.getPackageName())
+                == PackageManager.PERMISSION_GRANTED;
+    }
+
+}