OnCreate預計分號在Android工作室

Question

public class MainActivity extends AppCompatActivity { 
     private TaskDBHelper helper; 
     private ListAdapter listAdapter; 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 

      private void updateUI(){ 
       helper = new TaskDBHelper(MainActivity.this); 
       SQLiteDatabase sqlDB = helper.getReadableDatabase(); 
       Cursor cursor = sqlDB.query(TaskContract.TABLE, 
         new String[]{TaskContract.Columns._ID, TaskContract.Columns.TASK}, 
         null, null, null, null, null); 

       listAdapter = new SimpleCursorAdapter(
         this, 
         R.layout.task_view, 
         cursor, 
         new String[]{TaskContract.Columns.TASK}, 
         new int[]{R.id.taskTextView}, 
         0 
       ); 
       ListView listView = (ListView) findViewById(R.id.list); 
       listView.setAdapter(listAdapter); 
      } 
     } 
} 

我不斷收到一個私人無效updateUI（）紅色標記顯示預期（分號）表示錯誤消息。

Answer 1

試試這個：

public class MainActivity extends AppCompatActivity { 
     private TaskDBHelper helper; 
     private ListAdapter listAdapter; 
     @Override 
     public void onCreate(Bundle savedInstanceState) { 
       super.onCreate(savedInstanceState); 
       updateUI(); 
       ListView listView = (ListView) findViewById(R.id.list); 
       listView.setAdapter(listAdapter); 
      } 

      private void updateUI(){ 
       helper = new TaskDBHelper(MainActivity.this); 
       SQLiteDatabase sqlDB = helper.getReadableDatabase(); 
       Cursor cursor = sqlDB.query(TaskContract.TABLE, 
         new String[]{TaskContract.Columns._ID, TaskContract.Columns.TASK}, 
         null, null, null, null, null); 

       listAdapter = new SimpleCursorAdapter(
         this, 
         R.layout.task_view, 
         cursor, 
         new String[]{TaskContract.Columns.TASK}, 
         new int[]{R.id.taskTextView}, 
         0 
       ); 
     } 
} 

Answer 2

在Java中，你不能聲明裏面的另一種方法的範圍的方法。您只能在類的範圍內聲明方法。因此，您聲明方法updateUI()的方式無效，應移至類作用域。