Question

此DialogFragment实现会导致

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

。为什么？溶液

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");
    }
}
}

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

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？

Answer 1

来自Android文档：

public Dialog onCreateDialog（Bundle savedInstanceState）

覆盖以构建您自己的自定义Dialog容器。这是   通常用于显示AlertDialog而不是通用Dialog;   这样做时，onCreateView（LayoutInflater，ViewGroup，Bundle）就可以了   因为AlertDialog会自己处理，所以不需要实现   内容。

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

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

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

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

Answer 2

你可以试试这个：

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle("Title");
    builder.setMessage("Message");
    builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
        @Override
        public void onClick(DialogInterface dialog, int which) {
            // do something positive
        }
    });
    return builder.create();
}

@Override
public void onCancel(DialogInterface dialog) {
    // do something
}

希望它可以帮助...

Answer 3

为对话框设置OnCancelListener而不是其构建器。

public Dialog onCreateDialog(Bundle savedInstanceState){

    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder .setTitle(getArguments().getString("title"))
        .setMessage(getArguments().getString("message"))
        .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();
            }});

    Dialog dialog = builder.create();
    dialog.setOnCancelListener(onCancelListener);
    return dialog;
}

Answer 4

试试这段代码我希望这会有用..

AlertDialog.Builder builder = new AlertDialog.Builder(
            class_name.this);
    builder.setTitle("Title");      
    AlertDialog dialog = builder.create();
    dialog.setButton("ok", new DialogInterface.OnClickListener() {

        public void onClick(DialogInterface dialog, int which) {            

    });


    dialog.setButton2("Cancel", new DialogInterface.OnClickListener() {

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


            dialog.cancel();

        }
    });
    dialog.show();

IllegalStateException（“你不能设置Dialog的OnCancelListener或OnDismissListener”）

4 个答案: