在Java Android中为自定义对话框创建通用类

Question

我的应用程序显示了许多自定义对话框，例如“是/否”或“接受/取消决定”，并且在编写代码时，我意识到遵循相同的模式重复了太多代码。

我想建立一个通用类，但我不知道该怎么做，或更确切地说，我不知道该怎么做（接口，抽象类，继承，静态类等）。

这是我目前的课程：

public class DialogTwoOptions extends Dialog {

TextView title_tv;
// Button yes_btn, no_btn;

public DialogTwoOptions(Context context) 
{
    super(context);     
    setContentView(R.layout.dialogo_sino); // a simple layout with a TextView and Two Buttons

    title_tv = (TextView) findViewById(R.id.dialogo_titulo_sino);
    // yes_btn = (Button) findViewById(R.id.dialogo_aceptar); 
    // no_btn = (Button) findViewById(R.id.dialogo_cancelar);

    View v = getWindow().getDecorView();
    v.setBackgroundResource(android.R.color.transparent);
}

 public void quitDialog(View v) {
     if (isShowing()) dismiss();
 }

 public void setTitle(String title) {
     title_tv.setText(title);
 }

}

这就是我需要使用此类时要做的事情：

final DialogTwoOptions dialog = new DialogTwoOptions(this);

    Button yes = (Button) dialog.findViewById(R.id.dialog_yes_btn);
    Button no = (Button) dialog.findViewById(R.id.dialog_no_btn);

    yes.setOnClickListener(new Button.OnClickListener() 
    {
        public void onClick(View v)     {
            dialog.dismiss();
            // Do something 
        }
    });

    no.setOnClickListener(new Button.OnClickListener() 
    {
        public void onClick(View v)     {
            dialog.dismiss();
            // Do something
        }
    });

    dialog.show();

我敢肯定它是可改进的，但是您怎么能做到呢？

谢谢

Answer 1

首先创建一个Base
DialogFragment来保持的实例Activity。因此，当Dialog附加到时Activity，您将知道Activity创建该对话框的Instance
。

public abstract class BaseDialogFragment<T> extends DialogFragment {
        private T mActivityInstance;

        public final T getActivityInstance() {
                return mActivityInstance;
        }

        @Override
        public void onAttach(Activity activity) {
                mActivityInstance = (T) activity;
            super.onAttach(activity);
        }

        @Override
        public void onDetach() {
                super.onDetach();
                mActivityInstance = null;
        }
}

然后，创建一个GeneralDialogFragment扩展BaseDialogFragment

public class GeneralDialogFragment extends BaseDialogFragment<GeneralDialogFragment.OnDialogFragmentClickListener> {

        // interface to handle the dialog click back to the Activity
        public interface OnDialogFragmentClickListener {
            public void onOkClicked(GeneralDialogFragment dialog);
            public void onCancelClicked(GeneralDialogFragment dialog);
        }

        // Create an instance of the Dialog with the input
        public static GeneralDialogFragment newInstance(String title, String message) {
            GeneralDialogFragment frag = new GeneralDialogFragment();
            Bundle args = new Bundle();
            args.putString("title", title);
            args.putString("msg", message);
            frag.setArguments(args);
            return frag;
        }
        // Create a Dialog using default AlertDialog builder , if not inflate custom view in onCreateView
        @Override
        public Dialog onCreateDialog(Bundle savedInstanceState) {

            return new AlertDialog.Builder(getActivity())
                .setTitle(getArguments().getString("title"))
                .setMessage(getArguments().getString("message"))
                .setCancelable(false)
                .setPositiveButton("OK",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            // Positive button clicked
                            getActivityInstance().onOkClicked(GeneralDialogFragment.this);
                        }
                    }
                )
                .setNegativeButton("Cancel",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                            // negative button clicked
                            getActivityInstance().onCancelClicked(GeneralDialogFragment.this);
                        }
                    }
                )
                .create();
        }

    }

如果您需要使用自己的自定义布局进行对话框，请在中添加布局onCreateView并删除onCreateDialog。但是添加点击侦听器，onCreateView就像我在onCreateDialog

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

然后，在您Activity需要实施一个interface处理操作中dialog

public class TryMeActivity extends 
    FragmentActivity implements GeneralDialogFragment.OnDialogFragmentClickListener {

    @Override
        public void onOkClicked(GeneralDialogFragment dialog) {
                // do your stuff
        }

        @Override
        public void onCancelClicked(GeneralDialogFragment dialog) {
                // do your stuff
        }
}

最后，显示Dialog从你Activity需要的时候，这样的

    GeneralDialogFragment generalDialogFragment =
        GeneralDialogFragment.newInstance("title", "message");
    generalDialogFragment.show(getSupportFragmentManager(),"dialog");

希望这可以帮助。我确信这种方法是最优化的方法之一，但是也可能有不同的方法。