Question

我面临的问题是，即使“if”条件为真，我的代码也会执行“else”阻止。

public class MsgNewPackage extends Activity {


    private DatabaseHandler dbhandler;
     private SimpleCursorAdapter dataAdapter;
     private  ListView listView;

     String PKG_NAME,PKG_DUR,PKG_PRICE,PKG_ITEMS;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_msg_new_package);





         dbhandler = new DatabaseHandler(this);


          displayListView();
    }




private void displayListView() 


    {

    String check= "Mobilink";

     Intent intent = getIntent();
     String conn = intent.getStringExtra("NET_CONN");
    // Toast.makeText(getApplicationContext(), conn, Toast.LENGTH_SHORT).show(); 

     if(conn == check)
     {


        Cursor cursor = dbhandler.fetchAllMOBSMSPackages();

         String[] columns = new String[]{DatabaseHandler.KEY_PKG_NAME,DatabaseHandler.KEY_NO_OF_FREE_ITEMS,DatabaseHandler.KEY_DURATION,DatabaseHandler.KEY_CHARGES};

         // the XML defined views which the data will be bound to
          int[] to = new int[] { R.id.title,R.id.no_of_item,R.id.duration,R.id.pkgcharges};

        // create the adapter using the cursor pointing to the desired data 
          //as well as the layout information
          dataAdapter = new SimpleCursorAdapter(this, R.layout.list_row2, cursor,columns,to);

           listView = (ListView) findViewById(R.id.listView1);
          // Assign adapter to ListView
          listView.setAdapter(dataAdapter);

     } 


     else


     {  

            Cursor cursor = dbhandler.fetchAllSMSPackages();


             String[] columns = new String[]{DatabaseHandler.KEY_PKG_NAME,DatabaseHandler.KEY_NO_OF_FREE_ITEMS,DatabaseHandler.KEY_DURATION,DatabaseHandler.KEY_CHARGES};

             // the XML defined views which the data will be bound to
              int[] to = new int[] { R.id.title,R.id.no_of_item,R.id.duration,R.id.pkgcharges};

            // create the adapter using the cursor pointing to the desired data 
              //as well as the layout information
              dataAdapter = new SimpleCursorAdapter(this, R.layout.list_row2, cursor,columns,to);

               listView = (ListView) findViewById(R.id.listView1);
              // Assign adapter to ListView
              listView.setAdapter(dataAdapter);
     }

toast显示conn具有“Mobilink”但列表视图中填充了fetchAllSMSPackages（）的结果（即在else块中调用的函数），但不应该是这种情况。请求帮助。

Answer 1

尝试使用conn.equals(check)代替conn == check。

Java中的字符串是对象，而不是基元，因此您无法使用==来比较它们的值。这将比较整个对象，而不是文本。

Answer 2

比较字符串值时应使用.equals()。不是==。

尝试使用：

conn.equals(check);

Android if-else代码无法正常工作

2 个答案: