IllegalStateException(“您不能设置Dialog的OnCancelListener或OnDismissListener")

问题描述

此DialogFragment实现导致

This DialogFragment implementation causes an

.为什么?解决方案?

public class OkCThreadDialog1 extends DialogFragment{

DialogInterface.OnCancelListener onCancelListener;

public OkCThreadDialog1(){
}

public static OkCThreadDialog1 newInstance(String title, String message) {
    OkCThreadDialog1 frag = new OkCThreadDialog1();
    Bundle args = new Bundle();
    args.putString("title", title);
    args.putString("message", message);
    frag.setArguments(args);
    return frag;
}


public Dialog onCreateDialog(Bundle savedInstanceState){

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());


    builder .setTitle(getArguments().getString("title"))
            .setMessage(getArguments().getString("message"))
            .setOnCancelListener(onCancelListener)
            .setPositiveButton("Ok", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                }})
            .setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                public void onClick(DialogInterface dialog, int id) {
                    getDialog().cancel();
                }});

    return builder.create();
}

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
    // Verify that the host activity implements the callback interface
    try {
        onCancelListener = (DialogInterface.OnCancelListener) activity;
    } catch (ClassCastException e) {
        // The activity doesn't implement the interface, throw exception
        throw new ClassCastException(activity.toString()
                + " must implement OkCancelDialogListener");
    }
}
}

我的活动实现了DialogInterface.OnCancelListener，如下所示:

My Activity implements DialogInterface.OnCancelListener as follow:

public class MainActivity extends Activity implements OkCancelDialogListener{

static final String TAG ="MainActivity";

@Override
public void onCancel(DialogInterface dialog) {


}
}

从builder.create();引发欺骗.怎么了?

推荐答案

来自 Android文档:

重写以构建自己的自定义Dialog容器.这是通常用于显示AlertDialog而不是通用对话框；这样做时，onCreateView(LayoutInflater，ViewGroup，Bundle)可以无需实施，因为AlertDialog会自行处理内容.

Override to build your own custom Dialog container. This istypically used to show an AlertDialog instead of a generic Dialog;when doing so, onCreateView(LayoutInflater, ViewGroup, Bundle) doesnot need to be implemented since the AlertDialog takes care of its owncontent.

此方法将在onCreate(Bundle)之后和之前调用onCreateView(LayoutInflater，ViewGroup，Bundle).默认值实现只是实例化并返回一个Dialog类.

This method will be called after onCreate(Bundle) and beforeonCreateView(LayoutInflater, ViewGroup, Bundle). The defaultimplementation simply instantiates and returns a Dialog class.

注意:DialogFragment拥有Dialog.setOnCancelListener和Dialog.setOnDismissListener回调.您不能自己设置它们.

要了解有关这些事件的信息，请重写onCancel(DialogInterface)和onDismiss(DialogInterface).

To find out about these events, override onCancel(DialogInterface) andonDismiss(DialogInterface).

因此，基本上，您必须覆盖onDismiss或OnCancel而不是'.setOnCancelListener(onCancelListener)'.

So basically, you must override the onDismiss or OnCancel instead of '.setOnCancelListener(onCancelListener)'.

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