Android对话框错误指定的孩子已经有一个父级。您必须先在孩子的父级上调用远程视图（）

Question

我正在尝试将数据提供给我的listView，单击FAB时，它会显示一个对话框，其中包含一个editText和两个按钮。在第一次，它允许我向ListView提供数据。但是当我第二次尝试时，它会显示错误：

FATAL EXCEPTION： main
Process：com.example.app.wounderlist.wounderlist.HomeFragment， PID： 3790
1.onClick：指定的子节点已经有了父节点。您必须首先在子节点的父节点上调用远程视图（）。在HomeFragment.java:79（android.view.View.performClick）View.java:4444（android.view.View）PerformClick.run（View.java:18457）android.os.Handler.handleCallback（Handler.java:733）android.os.Handler.dispatchMessage（Handler.java:95）android.os.Looper.loop（AlertController.java:226）android.support.v7.app.AlertDialog.onCreate（AlertDialog.java:257）android.app.Dialog.dispatchOnCreate（Dialog.java:361）android.app.Dialog.show（Dialog.java:262）com.example.app.wounderlist.wounderlistjava.lang.IllegalStateException（android.view.ViewGroup.addViewInner）ViewGroup.java:3562（android.view.ViewGroup.addView）ViewGroup.java:3415android.view.ViewGroup.addView（ViewGroup.java:3391）android.support.v7.app.AlertController.setupCustomContent（AlertController.java:647）android.support.v7.app.AlertController.setupView（AlertController.java:463）android.support.v7.app.AlertController.installContent（Loper. java： 136）android. app. ActivityThread. main（ActivityThread. java： 5113）在java. lang.反射。方法。

//create a dialog box with a editText and a Add button when pressing the #FAB
        final EditText taskEditText = new EditText(getActivity());
        mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                AlertDialog dialog = new AlertDialog.Builder(getActivity())
                        .setTitle("Add a new task")
                        .setMessage("What do you want to do next?")
                        .setView(taskEditText)
                        .setPositiveButton("Add", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //for getting text from the editText
                                String itemText = taskEditText.getText().toString();
                                mItemsAdapter.add(itemText);


                            }
                        })
                        .setNegativeButton("Cancel", null)
                        .create();
                dialog.show();
            }
        });

Answer 1

final EditText taskEditText = new EditText(getActivity());
        AlertDialog.Builder builder1 = new AlertDialog.Builder(getActivity());
        builder1.setMessage("What do you want to do next?");

        //I add this extra code to get the EditText
        builder1.setView(taskEditText);
        builder1.setCancelable(true);

        builder1.setPositiveButton("Add", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {

                //for getting text from the editText
                String itemText = taskEditText.getText().toString();
                mItemsAdapter.add(itemText);

                //And I also add this code to clear the editText
                taskEditText.setText("");

            }
        });

        builder1.setNegativeButton(
                "Cancel", null);

        final AlertDialog alert11 = builder1.create();

        mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                alert11.show();
            }
        });

快乐编码！！

Answer 2

每次单击按钮，您都会创建警报对话框的新实例。在＜code＞OnClickListener

试试这个:

 final EditText taskEditText = new EditText(getActivity());
AlertDialog.Builder builder1 = new AlertDialog.Builder(getActivity());
builder1.setMessage("What do you want to do next?");
builder1.setCancelable(true);

builder1.setPositiveButton("Add", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {

                                //for getting text from the editText
                                String itemText = taskEditText.getText().toString();
                                mItemsAdapter.add(itemText);

                            }
                        });

builder1.setNegativeButton(
   "Cancel", null);

AlertDialog alert11 = builder1.create();

 mFab.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
               alert11.show();
            }
        });