Check for system alert window permission

It is possible that the user disables theme chooser from being able
to draw on top of other applications.  If this happens theme chooser
will crash due to a security exception.  This patch checks that we
still have the permission and if not, requests it from the user.

Change-Id: Ic4fc12293d4fa2c544d2e54ed8279dc07d7493f6
TICKET: CYNGNOS-3141

1 files changed, 28 insertions, 6 deletions

diff --git a/src/com/cyngn/theme/chooser/ChooserActivity.java b/src/com/cyngn/theme/chooser/ChooserActivity.java
index b1f943f..d607eb6 100644
--- a/src/com/cyngn/theme/chooser/ChooserActivity.java
+++ b/src/com/cyngn/theme/chooser/ChooserActivity.java
@@ -28,6 +28,7 @@ import android.os.AsyncTask;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.RemoteException;
+import android.provider.Settings;
 import android.renderscript.Allocation;
 import android.renderscript.Element;
 import android.renderscript.RenderScript;
@@ -112,6 +113,11 @@ public class ChooserActivity extends FragmentActivity
      */
     public static final int REQUEST_PICK_LOCKSCREEN_IMAGE = 3;
 
+    /**
+     * Request code for enabling system alert window permission
+     */
+    private static final int REQUEST_SYSTEM_WINDOW_PERMISSION = 4;
+
     private static final long ANIMATE_CONTENT_IN_SCALE_DURATION = 500;
     private static final long ANIMATE_CONTENT_IN_ALPHA_DURATION = 750;
     private static final long ANIMATE_CONTENT_IN_BLUR_DURATION = 250;
@@ -242,10 +248,11 @@ public class ChooserActivity extends FragmentActivity
                 new View.OnClickListener() {
             @Override
             public void onClick(View v) {
-                PreferenceUtils.setShowPerAppThemeNewTag(ChooserActivity.this, false);
-                Intent intent = new Intent(ChooserActivity.this, PerAppThemingWindow.class);
-                startService(intent);
-                finish();
+                if (Settings.canDrawOverlays(ChooserActivity.this)) {
+                    launchAppThemer();
+                } else {
+                    requestSystemWindowPermission();
+                }
             }
         });
 
@@ -771,8 +778,10 @@ public class ChooserActivity extends FragmentActivity
                     showSaveApplyButton();
                 }
             }
-        } else {
-            super.onActivityResult(requestCode, resultCode, data);
+        } else if (requestCode == REQUEST_SYSTEM_WINDOW_PERMISSION) {
+            if (Settings.canDrawOverlays(this)) {
+                launchAppThemer();
+            }
         }
     }
 
@@ -1166,4 +1175,17 @@ public class ChooserActivity extends FragmentActivity
             }
         });
     }
+
+    private void launchAppThemer() {
+        PreferenceUtils.setShowPerAppThemeNewTag(ChooserActivity.this, false);
+        Intent intent = new Intent(ChooserActivity.this, PerAppThemingWindow.class);
+        startService(intent);
+        finish();
+    }
+
+    private void requestSystemWindowPermission() {
+        Intent intent = new Intent (Settings.ACTION_MANAGE_OVERLAY_PERMISSION,
+                Uri.parse("package:" + getPackageName()));
+        startActivityForResult(intent, REQUEST_SYSTEM_WINDOW_PERMISSION);
+    }
 }