Question

我正在尝试从警告对话框中启动日期选择器。但由于某种原因，showDialog（DATE_DIALOG_ID）根本没有打开。有些人可以告诉我有什么问题。

final AlertDialog.Builder alt_bld = new AlertDialog.Builder(this);
        alt_bld.setIcon(R.drawable.icon);
        alt_bld.setTitle("Categories");
        alt_bld.setSingleChoiceItems(categoryType, -1, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int item) {
                System.out.println("Category selected= "+categoryType[item]);
                Toast.makeText(getApplicationContext(), "Category selected= "+categoryType[item], Toast.LENGTH_SHORT).show();
                category=categoryType[item];


                if(category.equalsIgnoreCase("Time")){
                    showDialog(DATE_DIALOG_ID);
                    System.out.println("selected date here:"+selectedDate);
                    Intent intent = new Intent(MainActivity.this, ListViewActivity.class);
                    bundle.putString("category", category);
                    bundle.putString("attribute", selectedDate);
                    intent.putExtras(bundle);
                    startActivity(intent);

                }

其他与datepicker相关的代码

static final int DATE_DIALOG_ID = 0;



@Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
        case DATE_DIALOG_ID:
            return new DatePickerDialog(this,
                        mDateSetListener,
                        mYear, mMonth, mDay);
        }
        return null;
    }   


    private DatePickerDialog.OnDateSetListener mDateSetListener =
        new DatePickerDialog.OnDateSetListener() {


        public void onDateSet(DatePicker view, int year,
                              int monthOfYear, int dayOfMonth) {
            mYear = year;
            mMonth = monthOfYear;
            mDay = dayOfMonth;
            selectedDate = Integer.toString(mMonth)+"-"+Integer.toString(mDay)+"-"+Integer.toString(mYear);
            System.out.println("selected date is:"+selectedDate);
        }


    };

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.homescreen);

        final Calendar cal = Calendar.getInstance();
        mYear = cal.get(Calendar.YEAR);
        mMonth = cal.get(Calendar.MONTH);
        mDay = cal.get(Calendar.DAY_OF_MONTH);

Answer 1

在你的代码中，你正在调用showDialog（int）;并立即启动新意图。你期望看到一个对话框。实际上会因为对话框未关闭而导致内存泄漏。

来自警报对话框的android日期选择器

1 个答案: