java - 实现 DialogFragment 的回调

Question

从我的 Recylerview Adapter 中，每个项目都有多个按钮， 我想要的是在单击时将 DialogFragment 显示为确认，并在单击 PositiveButton 时执行不同的方法/操作。

问题是我不知道如何在单击 positiveButton 时实现回调，并且可以根据要单击的按钮执行不同的方法或操作每个项目。

例如在我的适配器类上

@Override
public void onBindViewHolder(final PageOnlineAdapter.TheViewHolder holder, final int position) {

    holder.btn_start.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DialogFragment newFragment = ConfirmationDialog.newInstance(TITLE,CONTENT); //Initialize DialogFragment with a specific Title and Content
            newFragment.show(((AppCompatActivity)contextView).getSupportFragmentManager(), TAG); 
            /*
                if positiveButton is clicked
                    =>execute method/action here
            */
        }
    );

    holder.btn_stop.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DialogFragment newFragment = ConfirmationDialog.newInstance(TITLE,CONTENT); //Initialize DialogFragment with a specific Title and Content
            newFragment.show(((AppCompatActivity)contextView).getSupportFragmentManager(), TAG); 
            /*
                if positiveButton is clicked
                    =>execute method/action here
            */  
        }
    );

    holder.btn_close.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DialogFragment newFragment = ConfirmationDialog.newInstance(TITLE,CONTENT); //Initialize DialogFragment with a specific Title and Content
            newFragment.show(((AppCompatActivity)contextView).getSupportFragmentManager(), TAG); 
            /*
                if positiveButton is clicked
                    =>execute method/action here
            */  
        }
    );

    holder.btn_remove.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DialogFragment newFragment = ConfirmationDialog.newInstance(TITLE,CONTENT); //Initialize DialogFragment with a specific Title and Content
            newFragment.show(((AppCompatActivity)contextView).getSupportFragmentManager(), TAG); 
            /*
                if positiveButton is clicked
                    =>execute method/action here
            */ 
        }
    );
}

这是我的 DialogFragment 类

public class ConfirmationDialog extends DialogFragment {

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

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        String title = getArguments().getString("title");
        String description = getArguments().getString("description");
        return new AlertDialog.Builder(getActivity())
                //.setIcon(R.drawable.alert_dialog_icon)
                .setTitle(title)
                .setMessage(description)
                .setPositiveButton("CONTINUE",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                               //How to tell when this positiveButton is clicked
                            }
                        }
                )
                .setNegativeButton("CANCEL",
                        new DialogInterface.OnClickListener() {
                            public void onClick(DialogInterface dialog, int whichButton) {
                                //How to tell when this negativeButton is clicked
                            }
                        }
                )
                .create();
    }
}

Answer 1

首先，我想说感谢Merve Sahin创建Interface的想法。

我最终使用了下面的代码，而不是接受的答案。 这使我拥有一类 DialogFragment 并将其用于许多情况例如 通过多个按钮调用并根据单击的按钮进行响应。

首先，您需要导入以下内容:

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;

对于AlertDialog，创建一个类:

public class ConfirmDialog extends DialogFragment {

    public static final String TITLE = "title", CONTENT = "content";
    private OnContinueCancelClick continueCancelClick;

    public static ConfirmDialog newInstance(String title, String content) {
        ConfirmDialog frag = new ConfirmDialog();
        Bundle args = new Bundle();
        args.putString(TITLE, title);
        args.putString(CONTENT, content);
        frag.setArguments(args);
        return frag;
    }

    public void setOnContinueCancelClick(OnContinueCancelClick continueCancelClick) {
        this.continueCancelClick = continueCancelClick;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        String title = getArguments().getString(TITLE);
        String content = getArguments().getString(CONTENT);
        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(title).setMessage(content)
                .setNegativeButton("CANCEL", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        if(continueCancelClick != null)
                            continueCancelClick.onCancelClicked();
                    }
                })
                .setPositiveButton("CONTINUE", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface arg0, int arg1) {
                        if(continueCancelClick != null)
                            continueCancelClick.onContinueClicked();
                    }
                });
        Dialog dialog = builder.create();
        return dialog;

    }

    //Declare an Interface
    public interface OnContinueCancelClick{
        void onContinueClicked();
        void onCancelClicked();
    }
}

当显示对话框并且您需要单击按钮时，请说一下我的情况:

holder.btn_start.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        /** Start the Dialog Here **/

            ConfirmDialog confirmDialog = ConfirmDialog.newInstance("Titile of Dialog","Content or Description of Dialog"); //Setup Dialog
            confirmDialog.show(((AppCompatActivity)contextView).getSupportFragmentManager(), "confirmDialog"); //Show the Dialog
            confirmDialog.setOnContinueCancelClick(new ConfirmDialog.OnContinueCancelClick(){ //listen on Clicked Button
                    @Override
                    public void onContinueClicked() {
                        //Do some operation or call some functions when Continue button is Clicked
                    }
                    @Override
                    public void onCancelClicked() {
                        //Do Nothing or Do some operation or call some functions when Cancel button is Clicked
                    }
                });

        /**  END **/
    }
);

您可以使用自定义 View 或布局执行相同的操作

public class ConfirmDialog extends DialogFragment {

    private Button btnCancel, btnContinue;

    public static final String TITLE = "title", CONTENT = "content";
    private OnContinueCancelClick continueCancelClick;

    public static ConfirmDialog newInstance(String title, String content) {
        ConfirmDialog frag = new ConfirmDialog();
        Bundle args = new Bundle();
        args.putString(TITLE, title);
        args.putString(CONTENT, content);
        frag.setArguments(args);
        return frag;
    }

    public void setOnContinueCancelClick(OnContinueCancelClick continueCancelClick) {
        this.continueCancelClick = continueCancelClick;
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        return inflater.inflate(R.layout.dialog_custom_layout, container);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        //Some initialization or condition here...
        btnCancel = (Button)view.findViewById(R.id.btn_cancel); //Intialize your Cancel Button
        btnContinue = (Button)view.findViewById(R.id.btn_continue); //Intialize your Continue Button

        getDialog().setTitle(getArguments().getString(TITLE)); //Set the Title

        btnCancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(continueCancelClick != null)
                    continueCancelClick.onCancelClicked(); //Return this
                dismiss(); //Close the Dialog when Done
            }
        });

        btnContinue.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if(continueCancelClick != null)
                    continueCancelClick.onContinueClicked(); //Return this
                dismiss(); //Close the Dialog when Done
            }
        });
    }

    public interface OnContinueCancelClick{
        void onContinueClicked();
        void onCancelClicked();
    }
}

这可以帮助其他人，因此我在使用界面的帮助下发布了我的解决方案。

这个Question回答者 Nepster也为我完成这个任务提供了很多帮助。

希望这对你们有帮助。