IllegalStateException( "你不能设置 Dialog 的 OnCancelListener 或 OnDismissListener") [英] IllegalStateException( "You can not set Dialog's OnCancelListener or OnDismissListener")

问题描述

这个 DialogFragment 实现导致一个

This DialogFragment implementation causes an

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

IllegalStateException( "You can not set Dialog's OnCancelListener or OnDismissListener")

.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Activity实现了DialogInterface.OnCancelListener如下:

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(); 抛出异常.怎么了?

Exeception is thrown from builder.create();. What's wrong?

推荐答案

来自 Android 文档:

公共对话框 onCreateDialog (Bundle savedInstanceState)

public Dialog onCreateDialog (Bundle savedInstanceState)

覆盖以构建您自己的自定义对话框容器.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) 会不需要实施，因为 AlertDialog 会照顾自己内容.

Override to build your own custom Dialog container. This is typically used to show an AlertDialog instead of a generic Dialog; when doing so, onCreateView(LayoutInflater, ViewGroup, Bundle) does not need to be implemented since the AlertDialog takes care of its own content.

这个方法会在onCreate(Bundle)之后和之前调用onCreateView(LayoutInflater, ViewGroup, Bundle).默认的实现只是实例化并返回一个 Dialog 类.

This method will be called after onCreate(Bundle) and before onCreateView(LayoutInflater, ViewGroup, Bundle). The default implementation simply instantiates and returns a Dialog class.

注意:DialogFragment 拥有 Dialog.setOnCancelListener 和 Dialog.setOnDismissListener 回调.您不得自行设置.

要了解这些事件，请覆盖 onCancel(DialogInterface) 和onDismiss(DialogInterface).

所以基本上，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)'.

这篇关于IllegalStateException( "你不能设置 Dialog 的 OnCancelListener 或 OnDismissListener")的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！