1.27 Delete pet from editor menu item

app/src/main/java/com/example/android/pets/EditorActivity.java

@@ -276,7 +276,8 @@ public boolean onOptionsItemSelected(MenuItem item) {
                 return true;
             // Respond to a click on the "Delete" menu option
             case R.id.action_delete:
-                // Do nothing for now
+                // Pop up confirmation dialog for deletion
+                showDeleteConfirmationDialog();
                 return true;
             // Respond to a click on the "Up" arrow button in the app bar
             case android.R.id.home:
@@ -433,4 +434,60 @@ public void onClick(DialogInterface dialog, int id) {
         AlertDialog alertDialog = builder.create();
         alertDialog.show();
     }
+
+    /**
+     * Prompt the user to confirm that they want to delete this pet.
+     */
+    private void showDeleteConfirmationDialog() {
+        // Create an AlertDialog.Builder and set the message, and click listeners
+        // for the postivie and negative buttons on the dialog.
+        AlertDialog.Builder builder = new AlertDialog.Builder(this);
+        builder.setMessage(R.string.delete_dialog_msg);
+        builder.setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int id) {
+                // User clicked the "Delete" button, so delete the pet.
+                deletePet();
+            }
+        });
+        builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
+            public void onClick(DialogInterface dialog, int id) {
+                // User clicked the "Cancel" button, so dismiss the dialog
+                // and continue editing the pet.
+                if (dialog != null) {
+                    dialog.dismiss();
+                }
+            }
+        });
+
+        // Create and show the AlertDialog
+        AlertDialog alertDialog = builder.create();
+        alertDialog.show();
+    }
+
+    /**
+     * Perform the deletion of the pet in the database.
+     */
+    private void deletePet() {
+        // Only perform the delete if this is an existing pet.
+        if (mCurrentPetUri != null) {
+            // Call the ContentResolver to delete the pet at the given content URI.
+            // Pass in null for the selection and selection args because the mCurrentPetUri
+            // content URI already identifies the pet that we want.
+            int rowsDeleted = getContentResolver().delete(mCurrentPetUri, null, null);
+
+            // Show a toast message depending on whether or not the delete was successful.
+            if (rowsDeleted == 0) {
+                // If no rows were deleted, then there was an error with the delete.
+                Toast.makeText(this, getString(R.string.editor_delete_pet_failed),
+                        Toast.LENGTH_SHORT).show();
+            } else {
+                // Otherwise, the delete was successful and we can display a toast.
+                Toast.makeText(this, getString(R.string.editor_delete_pet_successful),
+                        Toast.LENGTH_SHORT).show();
+            }
+        }
+
+        // Close the activity
+        finish();
+    }
 }

app/src/main/res/values/strings.xml

@@ -59,6 +59,21 @@
     <!-- Dialog button text for the option to keep editing the current pet [CHAR LIMIT=20] -->
     <string name="keep_editing">Keep Editing</string>
 
+    <!-- Toast message in editor when current pet was successfully deleted [CHAR LIMIT=NONE] -->
+    <string name="editor_delete_pet_successful">Pet deleted</string>
+
+    <!-- Toast message in editor when current pet has failed to be deleted [CHAR LIMIT=NONE] -->
+    <string name="editor_delete_pet_failed">Error with deleting pet</string>
+
+    <!-- Dialog message to ask the user to confirm deleting the current pet [CHAR LIMIT=NONE] -->
+    <string name="delete_dialog_msg">Delete this pet?</string>
+
+    <!-- Dialog button text for the option to confirm deleting the current pet [CHAR LIMIT=20] -->
+    <string name="delete">Delete</string>
+
+    <!-- Dialog button text for the option to cancel deletion of the current pet [CHAR LIMIT=20] -->
+    <string name="cancel">Cancel</string>
+
     <!-- Label for overview category of attributes in the editor [CHAR LIMIT=30] -->
     <string name="category_overview">Overview</string>