Android 设置 OnClick 不工作/对话框不出现

Question

应用程序启动正常，但当我单击 Select_Players 按钮时，对话框不会出现在我的设备上。这是代码:

public class MainActivity extends Activity {


    private Button selectPlayers;

            @Override
        protected void onCreate(final Bundle savedInstanceState) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_demo);

            super.onStart();    //customize
            super.onResume();   //customize

            selectPlayers = (Button) findViewById(R.id.add_players);

            selectPlayers.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(View view) {

                    // Launch dialogbox on click
                    onCreateDialog(savedInstanceState);

                }
            });
        }

        public Dialog onCreateDialog(Bundle savedInstanceState) {

            @SuppressWarnings("rawtypes")
            final ArrayList mSelectedItems = new ArrayList();  // Where we track the selected items
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            // Set the dialog title
            builder.setTitle(R.string.select_players)

            // Specify the list array, the items to be selected by default (null for none),
            // and the listener through which to receive callbacks when items are selected
            .setMultiChoiceItems(R.array.players_name, null,
                    new DialogInterface.OnMultiChoiceClickListener() {

                @SuppressWarnings("unchecked")
                @Override
                public void onClick(DialogInterface dialog, int which,
                        boolean isChecked) {
                    if (isChecked) {
                        // If the user checked the item, add it to the selected items
                        mSelectedItems.add(which);
                    } else if (mSelectedItems.contains(which)) {
                        // Else, if the item is already in the array, remove it 
                        mSelectedItems.remove(Integer.valueOf(which));
                    }
                }
            })

            // Set the action buttons
            .setPositiveButton(R.string.ok, new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int id) {

                    //CODE TO CLOSE DIALOGBOX AND START FORGE

                }
            })
            .setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int id) {

                    //CODE TO JUST CLOSE DIALOGBOX

                }
            });

            return builder.create();
        }
}

我看到 Dialog 方法返回一个 Dialog，但我不确定如何让它显示为 onClick 的结果？ (作为引用，我采用了 Android 开发网站上的 Dialog 方法。)

谢谢!

Answer 1

此方法返回一个对话框，因此您必须在您的 onClick 中构建一个这样的对话框

     Dialog d = onCreateDialog(savedInstanceState);
     d.show();

我认为您曾尝试过重写 Activity 方法 onCreateDialog()，但您必须以另一种方式进行，如下所示:

http://www.mysamplecode.com/2011/11/android-alertdialog-example-showdialog.html