Question

代码一直在运行，直到我实现alertdialog活动。该活动在打开代码时会中断。

类和oncreate函数：

    public class NewTask extends Activity implements OnCheckedChangeListener {
    AlertDialog error = new AlertDialog.Builder(this).create();
                Button Done, Date;
                Task newtask=new Task();
                TextView dateview,prob;
                EditText name,desc;
                RadioGroup prio;
                int year,month,day;
                static final int DATE_DIALOG_ID = 1;
                @Override
                protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_new_task);
            initialize();
            Setdate();
            done();
                }

对话框的用法

               prio.setOnCheckedChangeListener(this);
    Done.setOnClickListener(new View.OnClickListener() {
        public void onClick(View v) {
            newtask.name=name.getText().toString();
            newtask.discrb=desc.getText().toString();
            if(newtask.name.length()==0||newtask.day==0||newtask.periocheck==0||newtask.discrb.length()==0)
            {
                error.setTitle("ERROR");
                error.setMessage("Please fill all the fields!!!");  
                error.setButton("ok", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        // TODO Auto-generated method stub

                    }
                });
                error.show();
            }
            else if(newtask.year<c.get(Calendar.YEAR)||(newtask.year==c.get(Calendar.YEAR)&&(newtask.month)<c.get(Calendar.MONTH))||(newtask.year==c.get(Calendar.YEAR)&&(newtask.month)==c.get(Calendar.MONTH)&&newtask.day<c.get(Calendar.DAY_OF_MONTH)))
            {
                error.setTitle("ERROR");
                error.setMessage("Choose an existing day!!!");  
                error.setButton("ok", new DialogInterface.OnClickListener() {

                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        // TODO Auto-generated method stub

                    }
                });
                error.show();
            }

所以请帮我找出错误

Answer 1

添加：

if(newtask.name.length()==0||newtask.day==0||newtask.periocheck==0||newtask.discrb.length()==0)
            {
               DialogFragment error = new ErrorMessage();
               error.show(getSupportFragmentManager(), "Error");

            }

像这样创建ErrorMessage类：

public class ErrorMessage extends DialogFragment {
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setMessage("Choose an existing day!!!");
               ...//Add title buttons here
        return builder.create();
    }
}

祝你好运！

我实现警告对话框时发生错误？

1 个答案: