Update task entry

Author: ksheremet

T09b.06-Exercise-UpdateTask/app/src/main/java/com/example/android/todolist/AddTaskActivity.java

@@ -71,17 +71,29 @@ protected void onCreate(Bundle savedInstanceState) {
             mButton.setText(R.string.update_button);
             if (mTaskId == DEFAULT_TASK_ID) {
                 // populate the UI
-                // TODO (3) Assign the value of EXTRA_TASK_ID in the intent to mTaskId
+                // Completed (3) Assign the value of EXTRA_TASK_ID in the intent to mTaskId
                 // Use DEFAULT_TASK_ID as the default
+                mTaskId = intent.getIntExtra(EXTRA_TASK_ID, DEFAULT_TASK_ID);
 
-                // TODO (4) Get the diskIO Executor from the instance of AppExecutors and
+                // Completed (4) Get the diskIO Executor from the instance of AppExecutors and
                 // call the diskIO execute method with a new Runnable and implement its run method
-
-                // TODO (5) Use the loadTaskById method to retrieve the task with id mTaskId and
-                // assign its value to a final TaskEntry variable
-
-                // TODO (6) Call the populateUI method with the retrieve tasks
-                // Remember to wrap it in a call to runOnUiThread
+                AppExecutors.getInstance().diskIO().execute(new Runnable() {
+                    @Override
+                    public void run() {
+                        // Completed (5) Use the loadTaskById method to retrieve the task with id mTaskId and
+                        // assign its value to a final TaskEntry variable
+                        final TaskEntry taskEntry = mDb.taskDao().loadTaskById(mTaskId);
+
+                        // Completed (6) Call the populateUI method with the retrieve tasks
+                        // Remember to wrap it in a call to runOnUiThread
+                        runOnUiThread(new Runnable() {
+                            @Override
+                            public void run() {
+                                populateUI(taskEntry);
+                            }
+                        });
+                    }
+                });
             }
         }
     }
@@ -114,9 +126,12 @@ public void onClick(View view) {
      * @param task the taskEntry to populate the UI
      */
     private void populateUI(TaskEntry task) {
-        // TODO (7) return if the task is null
+        // Completed (7) return if the task is null
+        if (task == null) return;
 
-        // TODO (8) use the variable task to populate the UI
+        // Completed (8) use the variable task to populate the UI
+        mEditText.setText(task.getDescription());
+        setPriorityInViews(task.getPriority());
     }
 
     /**
@@ -132,10 +147,15 @@ public void onSaveButtonClicked() {
         AppExecutors.getInstance().diskIO().execute(new Runnable() {
             @Override
             public void run() {
-                // TODO (9) insert the task only if mTaskId matches DEFAULT_TASK_ID
+                // Completed (9) insert the task only if mTaskId matches DEFAULT_TASK_ID
                 // Otherwise update it
                 // call finish in any case
-                mDb.taskDao().insertTask(taskEntry);
+                if (mTaskId == DEFAULT_TASK_ID) {
+                    mDb.taskDao().insertTask(taskEntry);
+                } else {
+                    taskEntry.setId(mTaskId);
+                    mDb.taskDao().updateTask(taskEntry);
+                }
                 finish();
             }
         });

T09b.06-Exercise-UpdateTask/app/src/main/java/com/example/android/todolist/MainActivity.java

@@ -141,6 +141,9 @@ public void run() {
     @Override
     public void onItemClickListener(int itemId) {
         // Launch AddTaskActivity adding the itemId as an extra in the intent
-        // TODO (2) Launch AddTaskActivity with itemId as extra for the key AddTaskActivity.EXTRA_TASK_ID
+        // Completed (2) Launch AddTaskActivity with itemId as extra for the key AddTaskActivity.EXTRA_TASK_ID
+        Intent intent = new Intent(this, AddTaskActivity.class);
+        intent.putExtra(AddTaskActivity.EXTRA_TASK_ID, itemId);
+        startActivity(intent);
     }
 }

T09b.06-Exercise-UpdateTask/app/src/main/java/com/example/android/todolist/database/TaskDao.java

@@ -24,6 +24,8 @@ public interface TaskDao {
     @Delete
     void deleteTask(TaskEntry taskEntry);
 
-    // TODO (1) Create a Query method named loadTaskById that receives an int id and returns a TaskEntry Object
+    // Completed (1) Create a Query method named loadTaskById that receives an int id and returns a TaskEntry Object
     // The query for this method should get all the data for that id in the task table
+    @Query("SELECT * FROM task WHERE id=:id")
+    TaskEntry loadTaskById(int id);
 }