Android Show User Dialog

CustomDialog. ..

xml:..

    <?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <LinearLayout
        android:id="@+id/createpost_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/cre"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:gravity="center_horizontal"
            android:text="CREATE POST"
            android:textColor="@color/mytextcolor"
            android:textSize="20sp" />

        <EditText
            android:id="@+id/topic_ev"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/txt_field"
            android:hint="topic" />

        <EditText
            android:id="@+id/description_ev"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:background="@drawable/destxt_field"
            android:hint="description"
            android:inputType="textMultiLine" />

        <Button
            android:id="@+id/upload_btn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="left"
            android:layout_margin="10dp"
            android:background="@drawable/upload_btn" />

        <TextView
            android:id="@+id/textu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:text="UPLOAD A FILE JPEG,GIF OR PNG 3MB Max"
            android:textSize="10sp" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/layout_forbuttons"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/createpost_layout"
        android:layout_margin="10dp"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/post_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_weight="1"
            android:background="@drawable/post_btn" />

        <Button
            android:id="@+id/cancel_btn"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_margin="10dp"
            android:layout_weight="1"
            android:background="@drawable/cancel_btn" />
    </LinearLayout>

</RelativeLayout>

CustomDialogClass

    import android.app.Activity;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.widget.Button;
import android.widget.Toast;

import com.example.fragmentaltdd.R;

public class CustomDialogClass extends Dialog implements
android.view.View.OnClickListener {

    public Activity c;
    public Dialog d;
    public Button Post, Cancel,Upload;

    public CustomDialogClass(Activity a)
    {
        super(a);

        this.c = a;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);


        requestWindowFeature(Window.FEATURE_NO_TITLE);

        setContentView(R.layout.createpost);

        Post = (Button) findViewById(R.id.post_btn);

        Cancel = (Button) findViewById(R.id.cancel_btn);

        Upload = (Button)findViewById(R.id.upload_btn);

        Post.setOnClickListener(this);

        Cancel.setOnClickListener(this);

        Upload.setOnClickListener(this);

    }

    @Override
    public void onClick(View v)
    {
        switch (v.getId())
        {
            case R.id.post_btn:
              //c.finish();
                Toast.makeText(c, "Post button clikced", Toast.LENGTH_LONG).show();
              break;

            case R.id.upload_btn:
                 // c.finish();
                Toast.makeText(c, "Upload button clikced", Toast.LENGTH_LONG).show();
                  break;

            case R.id.cancel_btn:
              dismiss();
              break;

            default:
              break;
        }
        dismiss();
    }
}

    CustomDialogClass cdd = new CustomDialogClass(getActivity());//while calling from fragment

CustomDialogClass cdd = new CustomDialogClass(YourActivity.this);//while calling from Activity

            cdd.show();