从另一个类调用Dialog

Question

我是android的初学者,而不是为每个活动中的对话重复编写代码,我只是创建了一个包含显示对话框的所有方法的类,我已经给出了小代码片段

public class Dialogues extends Activity implements DialogueMethods {


    public void showAlertDialog(Context context, String title, String message) {

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
        alertDialog.setTitle(title);
        alertDialog.setMessage(message);
        alertDialog.show();
}

    //this method am calling

    public void showAlertDialog(Context context, String title, String message, String ButtonText, boolean cancel) {

        AlertDialog.Builder alertDialog = new AlertDialog.Builder(context);
        alertDialog.setTitle(title);
        alertDialog.setMessage(message);

        if(cancel) {

            alertDialog.setNegativeButton(ButtonText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
                finish();
            }
        });
        }

        alertDialog.show();
    }

}

我在打电话

//dialogObj is instance of the above class

dialogObj.showAlertDialog(MyActivity.this, "Error", "Not Connected to Internet", "Exit", true);

当我运行代码对话框是可见但按钮不是,这是因为DialogInterace.onClickListener ?,我只是想知道这样做的好主意吗？如果是,那么这是正确的方法.请帮我.

谢谢.

Answer 1

只是我想分享我的方式,我是如何使用的.你可以上课,然后打电话到你想要的地方.

public class DialogsUtil {

private Context mContext;

public DialogsUtil(Context context) {
    this.mContext = context;
}

/**
 * Return an alert dialog
 *
 * @param message  message for the alert dialog
 * @param listener listener to trigger selection methods
 */
public void openAlertDialog(Context context, String message, String positiveBtnText, String negativeBtnText,
                            final OnDialogButtonClickListener listener) {

    AlertDialog.Builder builder = new AlertDialog.Builder(context);
    builder.setPositiveButton(positiveBtnText, (dialog, which) -> {
        dialog.dismiss();
        listener.onPositiveButtonClicked();

    });

    builder.setNegativeButton(negativeBtnText, (dialog, which) -> {
        dialog.dismiss();
        listener.onNegativeButtonClicked();

    });
    builder.setTitle(context.getResources().getString(R.string.app_name));
    builder.setMessage(message);
    builder.setIcon(android.R.drawable.ic_dialog_alert);
    builder.setCancelable(false);
    builder.create().show();
}

/**
 * return a dialog object
 * @return
 */
public Dialog openDialog(@LayoutRes int layoutId) {
    Dialog dialog = new Dialog(mContext);
    dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
    dialog.getWindow().setBackgroundDrawableResource(android.R.color.transparent);
    dialog.setContentView(layoutId);
    dialog.getWindow().setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
    dialog.getWindow().setGravity(Gravity.BOTTOM);
    dialog.setCancelable(true);
    dialog.setCanceledOnTouchOutside(false);
    return dialog;
}
}

我为这个对话框创建了一个界面,

public interface OnDialogButtonClickListener {

void onPositiveButtonClicked();

void onNegativeButtonClicked();
}

只需在您想要使用对话框的活动中实现此接口,并在类对象的帮助下,您可以使用这样的对话框,

 mDialogsUtil.openAlertDialog(YourActivity.this, "text message", "positive button msg", "Negative button msg", this);

你可以在你的活动中覆盖这两种方法,

@Override
public void onPositiveButtonClicked() {

}

//user clicked cancel.Close the application
@Override
public void onNegativeButtonClicked() {

}

谢谢希望这会对你有所帮助.