活动onBackPress没有显示警告对话框

Question

我有一个活动,当我按下后退按钮然后它没有显示警告对话框.可能是什么问题呢？这是我的代码

@Override
public void onBackPressed() {
    // TODO Auto-generated method stub
    super.onBackPressed();

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

                // set title
                alertDialogBuilder.setTitle("Exit");
                alertDialogBuilder.setIcon(R.drawable.ic_action_search);

                // set dialog message
                alertDialogBuilder
                    .setMessage("This action will cause you to abandon all changes on current new fish log. \n\nAre you sure you want to exit?")
                    .setCancelable(false)
                    .setPositiveButton("YES",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, close
                            startActivity(new Intent(LogFish.this,MainActivity.class));
                            finish();

                        }
                      })
                    .setNegativeButton("NO",new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog,int id) {
                            // if this button is clicked, just close

                            dialog.cancel();
                        }
                    });

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

                    // show it
                    alertDialog.show();

                    }

Answer 1

你必须删除super.onBackPressed();