Understand meaning of statement in code - activityCallback = (ToolbarListener) context

I am trying to understand the meaning of this line :

activityCallback = (ToolbarListener) context

under the expression -

public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }

I understand that a reference to context (here Parent Activity) will be created and stored in the activitycallback variable using the above expression.

However, I am unable how to understand how is it possible to cast an interface object to an activity (here context).

I am able to understand the other code in full and my project is working. It is a project in which a parent activity is communicating with two fragments using a listener interface.

I have attached the java files of the whole project in case you may want to review the code.

Regards,
Ravi.

----ToolbarFragment.java-----

package com.ebookfrenzy.fragmentexample;



import android.content.Context;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.SeekBar;



public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }



    @Override

    public View onCreateView(LayoutInflater inflater,

                             ViewGroup container,

                             Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.toolbar_fragment, container,false);



        editText = (EditText) view.findViewById(R.id.editText1);

        final SeekBar seekBar = view.findViewById(R.id.seekBar1);

        seekBar.setOnSeekBarChangeListener(this);

        final Button button = view.findViewById(R.id.button1);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                buttonClicked(v);

            }

        });







        return view;

    }



    private void buttonClicked(View v) {

        activityCallback.onButtonClick(seekValue, editText.getText().toString());

    }





    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        seekValue = progress;

    }



    @Override

    public void onStartTrackingTouch(SeekBar seekBar) {



    }



    @Override

    public void onStopTrackingTouch(SeekBar seekBar) {



    }

}



-----TextFragment.java----



package com.ebookfrenzy.fragmentexample;



import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;







public class TextFragment extends Fragment {



    private static TextView textView;



    @Override

    public View onCreateView(

            LayoutInflater inflater,

            ViewGroup container,

            Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.text_fragment, container, false);

        textView = (TextView)view.findViewById(R.id.textView1);

        return view;



    }



    public void changeTextProperties (int fontSize, String text) {

        textView.setTextSize(fontSize);

        textView.setText(text);



    }

}



----FragmentActivity.java----



package com.ebookfrenzy.fragmentexample;



import android.app.Activity;

import android.support.v4.app.FragmentActivity;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;



public class FragmentExampleActivity extends FragmentActivity

            implements ToolbarFragment.ToolbarListener{



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_fragment_example);

    }



    @Override

    public void onButtonClick(int fontSize, String text) {

        TextFragment textFragment = (TextFragment)

                getSupportFragmentManager().findFragmentById(R.id.text_fragment);

        textFragment.changeTextProperties(fontSize, text);



    }

}

asked Jan 2 at 8:34

Ravi Agrawal

add a comment |

I am trying to understand the meaning of this line :

activityCallback = (ToolbarListener) context

under the expression -

public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }

I understand that a reference to context (here Parent Activity) will be created and stored in the activitycallback variable using the above expression.

However, I am unable how to understand how is it possible to cast an interface object to an activity (here context).

I am able to understand the other code in full and my project is working. It is a project in which a parent activity is communicating with two fragments using a listener interface.

I have attached the java files of the whole project in case you may want to review the code.

Regards,
Ravi.

----ToolbarFragment.java-----

package com.ebookfrenzy.fragmentexample;



import android.content.Context;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.SeekBar;



public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }



    @Override

    public View onCreateView(LayoutInflater inflater,

                             ViewGroup container,

                             Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.toolbar_fragment, container,false);



        editText = (EditText) view.findViewById(R.id.editText1);

        final SeekBar seekBar = view.findViewById(R.id.seekBar1);

        seekBar.setOnSeekBarChangeListener(this);

        final Button button = view.findViewById(R.id.button1);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                buttonClicked(v);

            }

        });







        return view;

    }



    private void buttonClicked(View v) {

        activityCallback.onButtonClick(seekValue, editText.getText().toString());

    }





    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        seekValue = progress;

    }



    @Override

    public void onStartTrackingTouch(SeekBar seekBar) {



    }



    @Override

    public void onStopTrackingTouch(SeekBar seekBar) {



    }

}



-----TextFragment.java----



package com.ebookfrenzy.fragmentexample;



import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;







public class TextFragment extends Fragment {



    private static TextView textView;



    @Override

    public View onCreateView(

            LayoutInflater inflater,

            ViewGroup container,

            Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.text_fragment, container, false);

        textView = (TextView)view.findViewById(R.id.textView1);

        return view;



    }



    public void changeTextProperties (int fontSize, String text) {

        textView.setTextSize(fontSize);

        textView.setText(text);



    }

}



----FragmentActivity.java----



package com.ebookfrenzy.fragmentexample;



import android.app.Activity;

import android.support.v4.app.FragmentActivity;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;



public class FragmentExampleActivity extends FragmentActivity

            implements ToolbarFragment.ToolbarListener{



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_fragment_example);

    }



    @Override

    public void onButtonClick(int fontSize, String text) {

        TextFragment textFragment = (TextFragment)

                getSupportFragmentManager().findFragmentById(R.id.text_fragment);

        textFragment.changeTextProperties(fontSize, text);



    }

}

asked Jan 2 at 8:34

Ravi Agrawal

add a comment |

I am trying to understand the meaning of this line :

activityCallback = (ToolbarListener) context

under the expression -

public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }

I understand that a reference to context (here Parent Activity) will be created and stored in the activitycallback variable using the above expression.

However, I am unable how to understand how is it possible to cast an interface object to an activity (here context).

I am able to understand the other code in full and my project is working. It is a project in which a parent activity is communicating with two fragments using a listener interface.

I have attached the java files of the whole project in case you may want to review the code.

Regards,
Ravi.

----ToolbarFragment.java-----

package com.ebookfrenzy.fragmentexample;



import android.content.Context;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.SeekBar;



public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }



    @Override

    public View onCreateView(LayoutInflater inflater,

                             ViewGroup container,

                             Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.toolbar_fragment, container,false);



        editText = (EditText) view.findViewById(R.id.editText1);

        final SeekBar seekBar = view.findViewById(R.id.seekBar1);

        seekBar.setOnSeekBarChangeListener(this);

        final Button button = view.findViewById(R.id.button1);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                buttonClicked(v);

            }

        });







        return view;

    }



    private void buttonClicked(View v) {

        activityCallback.onButtonClick(seekValue, editText.getText().toString());

    }





    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        seekValue = progress;

    }



    @Override

    public void onStartTrackingTouch(SeekBar seekBar) {



    }



    @Override

    public void onStopTrackingTouch(SeekBar seekBar) {



    }

}



-----TextFragment.java----



package com.ebookfrenzy.fragmentexample;



import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;







public class TextFragment extends Fragment {



    private static TextView textView;



    @Override

    public View onCreateView(

            LayoutInflater inflater,

            ViewGroup container,

            Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.text_fragment, container, false);

        textView = (TextView)view.findViewById(R.id.textView1);

        return view;



    }



    public void changeTextProperties (int fontSize, String text) {

        textView.setTextSize(fontSize);

        textView.setText(text);



    }

}



----FragmentActivity.java----



package com.ebookfrenzy.fragmentexample;



import android.app.Activity;

import android.support.v4.app.FragmentActivity;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;



public class FragmentExampleActivity extends FragmentActivity

            implements ToolbarFragment.ToolbarListener{



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_fragment_example);

    }



    @Override

    public void onButtonClick(int fontSize, String text) {

        TextFragment textFragment = (TextFragment)

                getSupportFragmentManager().findFragmentById(R.id.text_fragment);

        textFragment.changeTextProperties(fontSize, text);



    }

}

asked Jan 2 at 8:34

Ravi Agrawal

I am trying to understand the meaning of this line :

activityCallback = (ToolbarListener) context

under the expression -

public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }

I understand that a reference to context (here Parent Activity) will be created and stored in the activitycallback variable using the above expression.

However, I am unable how to understand how is it possible to cast an interface object to an activity (here context).

I am able to understand the other code in full and my project is working. It is a project in which a parent activity is communicating with two fragments using a listener interface.

I have attached the java files of the whole project in case you may want to review the code.

Regards,
Ravi.

----ToolbarFragment.java-----

package com.ebookfrenzy.fragmentexample;



import android.content.Context;

import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.Button;

import android.widget.EditText;

import android.widget.SeekBar;



public class ToolbarFragment extends Fragment implements SeekBar.OnSeekBarChangeListener {





    private static int seekValue = 10;

    private static EditText editText;



    ToolbarListener activityCallback;



    public interface ToolbarListener {



        public void onButtonClick (int position, String text);



    }



    @Override

    public void onAttach(Context context) {

        super.onAttach(context);

        try {activityCallback = (ToolbarListener) context;}

            catch (ClassCastException e) {

            throw new ClassCastException(context.toString() + "must implement ToolBarListener");

            }



    }



    @Override

    public View onCreateView(LayoutInflater inflater,

                             ViewGroup container,

                             Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.toolbar_fragment, container,false);



        editText = (EditText) view.findViewById(R.id.editText1);

        final SeekBar seekBar = view.findViewById(R.id.seekBar1);

        seekBar.setOnSeekBarChangeListener(this);

        final Button button = view.findViewById(R.id.button1);

        button.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                buttonClicked(v);

            }

        });







        return view;

    }



    private void buttonClicked(View v) {

        activityCallback.onButtonClick(seekValue, editText.getText().toString());

    }





    @Override

    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

        seekValue = progress;

    }



    @Override

    public void onStartTrackingTouch(SeekBar seekBar) {



    }



    @Override

    public void onStopTrackingTouch(SeekBar seekBar) {



    }

}



-----TextFragment.java----



package com.ebookfrenzy.fragmentexample;



import android.os.Bundle;

import android.support.v4.app.Fragment;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.TextView;







public class TextFragment extends Fragment {



    private static TextView textView;



    @Override

    public View onCreateView(

            LayoutInflater inflater,

            ViewGroup container,

            Bundle savedInstanceState) {

        // inflate the layout for this fragment



        View view = inflater.inflate(R.layout.text_fragment, container, false);

        textView = (TextView)view.findViewById(R.id.textView1);

        return view;



    }



    public void changeTextProperties (int fontSize, String text) {

        textView.setTextSize(fontSize);

        textView.setText(text);



    }

}



----FragmentActivity.java----



package com.ebookfrenzy.fragmentexample;



import android.app.Activity;

import android.support.v4.app.FragmentActivity;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;



public class FragmentExampleActivity extends FragmentActivity

            implements ToolbarFragment.ToolbarListener{



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_fragment_example);

    }



    @Override

    public void onButtonClick(int fontSize, String text) {

        TextFragment textFragment = (TextFragment)

                getSupportFragmentManager().findFragmentById(R.id.text_fragment);

        textFragment.changeTextProperties(fontSize, text);



    }

}

android-studio interface fragment

asked Jan 2 at 8:34

Ravi Agrawal

asked Jan 2 at 8:34

Ravi Agrawal

asked Jan 2 at 8:34

Ravi Agrawal

asked Jan 2 at 8:34

Ravi Agrawal

asked Jan 2 at 8:34

Ravi Agrawal

add a comment |

1 Answer
1

active

oldest

votes

There might be several different activities that could host this fragment in different circumstances. So, we make a rule: any activity that hosts this fragment must implement ToolbarListener. That interface defines the "contract" between the fragment and the activities that host it. In onAttach(), we validate that the context is an ToolbarListener, then go ahead and save the cast to ToolbarListener for later use.

As the activity implements ToolbarListener so the ToolbarListener will be Parent of the implemented Activity's object. Hence you can Type cast it.

answered Jan 2 at 10:11

Aman Rawat

1829

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

add a comment |

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1 Answer
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As the activity implements ToolbarListener so the ToolbarListener will be Parent of the implemented Activity's object. Hence you can Type cast it.

answered Jan 2 at 10:11

Aman Rawat

1829

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

add a comment |

As the activity implements ToolbarListener so the ToolbarListener will be Parent of the implemented Activity's object. Hence you can Type cast it.

answered Jan 2 at 10:11

Aman Rawat

1829

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

add a comment |

As the activity implements ToolbarListener so the ToolbarListener will be Parent of the implemented Activity's object. Hence you can Type cast it.

answered Jan 2 at 10:11

Aman Rawat

1829

As the activity implements ToolbarListener so the ToolbarListener will be Parent of the implemented Activity's object. Hence you can Type cast it.

answered Jan 2 at 10:11

Aman Rawat

1829

answered Jan 2 at 10:11

Aman Rawat

1829

answered Jan 2 at 10:11

Aman Rawat

1829

answered Jan 2 at 10:11

Aman Rawat

1829

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

add a comment |

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

@RaviAgrawal Actually In Case of Object typecasting, the classes we need to typecast to other Class must be related by inheritence. As per my understanding, comparing properties is not the case .

– Aman Rawat
Jan 2 at 10:24

Thanks for taking the time to answer. This does clear up the confusion. Have a good day, Sir.

– Ravi Agrawal
Jan 2 at 10:25

@RaviAgrawal Happy to help.

– Aman Rawat
Jan 2 at 10:32

add a comment |

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