Android中退出程序的提示框

@Override  



    public boolean onKeyDown(int keyCode, KeyEvent event) {  



        if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) {  



            dialog();  



            return true;  



        }  



        return true;  



    }  



protected void dialog() {  



        AlertDialog.Builder builder = new Builder(AccoutList.this);  



        builder.setMessage("确定要退出吗?");  



        builder.setTitle("提示");  



        builder.setPositiveButton("确认",  



        new android.content.DialogInterface.OnClickListener() {  



            @Override  



            public void onClick(DialogInterface dialog, int which) {  



                dialog.dismiss();  



                //AccoutList.this.finish();  



                //System.exit(1);  



                android.os.Process.killProcess(android.os.Process.myPid());  



            }  



        });  



        builder.setNegativeButton("取消",  



        new android.content.DialogInterface.OnClickListener() {  



            @Override  



            public void onClick(DialogInterface dialog, int which) {  



                dialog.dismiss();  



            }  



        });  



        builder.create().show();  



    }