Question

 private void selectItem(int position) {

        Fragment fragment = null;

        switch (position) {
            case 0:
                fragment = new FaqFragment();
                break;
            case 1:
                fragment = new AboutFragment();
                break;
            case2:
            AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);


            // set title
            alertDialogBuilder.setTitle("Alert");

            // set dialog message
            alertDialogBuilder
                    .setMessage("Please select your choice")
                    .setCancelable(false)
                    .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {

                            //do whatever you want to do when user clicks ok

                        }
                    })
                    .setNegativeButton("No",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, just close
                            // the dialog box and do nothing
                            dialog.cancel();
                        }
                    });

            // create alert dialog
            AlertDialog alertDialog = alertDialogBuilder.create();

            // show it
            alertDialog.show();
            break;

            default:
                break;

        }

        if (fragment != null) {
            FragmentManager fragmentManager = getSupportFragmentManager();
            fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit();

            mDrawerList.setItemChecked(position, true);
            mDrawerList.setSelection(position);
            setTitle(mNavigationDrawerItemTitles[position]);
            mDrawerLayout.closeDrawer(mDrawerList);

        } else {
            Log.e("MainActivity", "Error in creating fragment");
        }
    }

上面的代码我想知道一个特定的listview项目，我需要显示带有yes或no按钮的对话框。但是在这里，我作为错误出现在线下，并且它没有显示一条语句。我该如何解决这个问题，请帮助我。...

AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);

Answer 1

您遇到错误，因为您需要在案例编号之间添加空格，例如case 2:

例如：-

  case 2:
        AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(MainActivity.this);


        // set title
        alertDialogBuilder.setTitle("Alert");

        // set dialog message
        alertDialogBuilder
                .setMessage("Please select your choice")
                .setCancelable(false)
                .setPositiveButton("Yes",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,int id) {

                        //do whatever you want to do when user clicks ok

                    }
                })
                .setNegativeButton("No",new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog,int id) {
                        // if this button is clicked, just close
                        // the dialog box and do nothing
                        dialog.cancel();
                    }
                });

        // create alert dialog
        AlertDialog alertDialog = alertDialogBuilder.create();

        // show it
        alertDialog.show();
        break;

片段Android导航抽屉中的显示对话框

1 个答案: