Call a non-static method inside an abstract class from a static method

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I'm trying to detect when the input method picker called by InputMethodManager.showInputMethodPicker() is closed or changed. I found a possible solution proposed by Sherif elKhatib in another question: How can I tell if the input method picker is open or closed?. His answer suggests that the OP should use an abstract non-static class. However, I don't know how to call a method from the abstract class in a static method. I thought I'd open a separate question for it here because the original question is already old and inactive.

Here is the solution introduced by Sherif:

public abstract class InputMethodActivity extends FragmentActivity {

    protected abstract void onInputMethodPicked();



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        mState = NONE;

        super.onCreate(savedInstanceState);

    }



    @Override

    public void onWindowFocusChanged(boolean hasFocus) {

        super.onWindowFocusChanged(hasFocus);

        if(mState == PICKING) {

            mState = CHOSEN;

        }

        else if(mState == CHOSEN) {

            onInputMethodPicked();

        }

    }



    private static final int NONE = 0;

    private static final int PICKING = 1;

    private static final int CHOSEN = 2;

    private int mState;

    protected final void pickInput() {

        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        imm.showInputMethodPicker();

        mState = PICKING;

    }

}

The method I'd like to call is pickInput() in order to get a response from onInputMethodPicked().

However, simply called pickInput(); from a static method doesn't work, and won't even find it.

Furthermore, InputMethodActivity.pickInput(); gives the error "Non-static method 'pickInput()' cannot be referenced from a static context".

Next, I tried to instantiate it, but I found out that abstracts cannot be instantiated: InputMethodActivity instant = new InputMethodActivity(); gives the error "'InputMethodActivity' is abstract; cannot be instantiated".

After further reading, I tried to create an anomynous class: InputMethodActivity anonym = new InputMethodActivity() {};, but this gives the error "Class 'Anonymous class derived from InputMethodActivity' must either be declared abstract or implement abstract method 'onInputMethodPicked()' in 'InputMethodActivity'". I thought both of them were already declared abstract, so I'm nearing the end of my ropes here.

Problem:

Basically, I would like to know if it's possible to run pickInput() in a static method, such as a public void onClick_TextView(View v){}, and how it can be achieved.

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

please post the code of your class where you want to call this method

– Amrdroid
Jan 3 at 7:16

and make sure you inherit from this abstract activity

– Amrdroid
Jan 3 at 7:26

@Amrnoid I added the code inside public class MainActivity extends AppCompatActivity implements View.OnTouchListener {}. Could you please explain how to inherit from the abstract activity? Sorry, my java knowledge is somewhat limited.

– Erlend K.H.
Jan 3 at 9:09

see my answer @Erlend K.H.

– Amrdroid
Jan 3 at 9:50

add a comment |

Here is the solution introduced by Sherif:

public abstract class InputMethodActivity extends FragmentActivity {

    protected abstract void onInputMethodPicked();



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        mState = NONE;

        super.onCreate(savedInstanceState);

    }



    @Override

    public void onWindowFocusChanged(boolean hasFocus) {

        super.onWindowFocusChanged(hasFocus);

        if(mState == PICKING) {

            mState = CHOSEN;

        }

        else if(mState == CHOSEN) {

            onInputMethodPicked();

        }

    }



    private static final int NONE = 0;

    private static final int PICKING = 1;

    private static final int CHOSEN = 2;

    private int mState;

    protected final void pickInput() {

        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        imm.showInputMethodPicker();

        mState = PICKING;

    }

}

The method I'd like to call is pickInput() in order to get a response from onInputMethodPicked().

However, simply called pickInput(); from a static method doesn't work, and won't even find it.

Furthermore, InputMethodActivity.pickInput(); gives the error "Non-static method 'pickInput()' cannot be referenced from a static context".

Problem:

Basically, I would like to know if it's possible to run pickInput() in a static method, such as a public void onClick_TextView(View v){}, and how it can be achieved.

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

please post the code of your class where you want to call this method

– Amrdroid
Jan 3 at 7:16

and make sure you inherit from this abstract activity

– Amrdroid
Jan 3 at 7:26

@Amrnoid I added the code inside public class MainActivity extends AppCompatActivity implements View.OnTouchListener {}. Could you please explain how to inherit from the abstract activity? Sorry, my java knowledge is somewhat limited.

– Erlend K.H.
Jan 3 at 9:09

see my answer @Erlend K.H.

– Amrdroid
Jan 3 at 9:50

add a comment |

Here is the solution introduced by Sherif:

public abstract class InputMethodActivity extends FragmentActivity {

    protected abstract void onInputMethodPicked();



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        mState = NONE;

        super.onCreate(savedInstanceState);

    }



    @Override

    public void onWindowFocusChanged(boolean hasFocus) {

        super.onWindowFocusChanged(hasFocus);

        if(mState == PICKING) {

            mState = CHOSEN;

        }

        else if(mState == CHOSEN) {

            onInputMethodPicked();

        }

    }



    private static final int NONE = 0;

    private static final int PICKING = 1;

    private static final int CHOSEN = 2;

    private int mState;

    protected final void pickInput() {

        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        imm.showInputMethodPicker();

        mState = PICKING;

    }

}

The method I'd like to call is pickInput() in order to get a response from onInputMethodPicked().

However, simply called pickInput(); from a static method doesn't work, and won't even find it.

Furthermore, InputMethodActivity.pickInput(); gives the error "Non-static method 'pickInput()' cannot be referenced from a static context".

Problem:

Basically, I would like to know if it's possible to run pickInput() in a static method, such as a public void onClick_TextView(View v){}, and how it can be achieved.

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

Here is the solution introduced by Sherif:

public abstract class InputMethodActivity extends FragmentActivity {

    protected abstract void onInputMethodPicked();



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        mState = NONE;

        super.onCreate(savedInstanceState);

    }



    @Override

    public void onWindowFocusChanged(boolean hasFocus) {

        super.onWindowFocusChanged(hasFocus);

        if(mState == PICKING) {

            mState = CHOSEN;

        }

        else if(mState == CHOSEN) {

            onInputMethodPicked();

        }

    }



    private static final int NONE = 0;

    private static final int PICKING = 1;

    private static final int CHOSEN = 2;

    private int mState;

    protected final void pickInput() {

        InputMethodManager imm = (InputMethodManager) getSystemService(Context.INPUT_METHOD_SERVICE);

        imm.showInputMethodPicker();

        mState = PICKING;

    }

}

The method I'd like to call is pickInput() in order to get a response from onInputMethodPicked().

However, simply called pickInput(); from a static method doesn't work, and won't even find it.

Furthermore, InputMethodActivity.pickInput(); gives the error "Non-static method 'pickInput()' cannot be referenced from a static context".

Problem:

Basically, I would like to know if it's possible to run pickInput() in a static method, such as a public void onClick_TextView(View v){}, and how it can be achieved.

java android methods static abstract-class

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

edited Jan 3 at 10:39

asked Jan 3 at 6:24

Erlend K.H.

135114

asked Jan 3 at 6:24

Erlend K.H.

135114

asked Jan 3 at 6:24

Erlend K.H.

135114

please post the code of your class where you want to call this method

– Amrdroid
Jan 3 at 7:16

and make sure you inherit from this abstract activity

– Amrdroid
Jan 3 at 7:26

@Amrnoid I added the code inside public class MainActivity extends AppCompatActivity implements View.OnTouchListener {}. Could you please explain how to inherit from the abstract activity? Sorry, my java knowledge is somewhat limited.

– Erlend K.H.
Jan 3 at 9:09

see my answer @Erlend K.H.

– Amrdroid
Jan 3 at 9:50

add a comment |

please post the code of your class where you want to call this method

– Amrdroid
Jan 3 at 7:16

and make sure you inherit from this abstract activity

– Amrdroid
Jan 3 at 7:26

@Amrnoid I added the code inside public class MainActivity extends AppCompatActivity implements View.OnTouchListener {}. Could you please explain how to inherit from the abstract activity? Sorry, my java knowledge is somewhat limited.

– Erlend K.H.
Jan 3 at 9:09

see my answer @Erlend K.H.

– Amrdroid
Jan 3 at 9:50

please post the code of your class where you want to call this method

– Amrdroid
Jan 3 at 7:16

and make sure you inherit from this abstract activity

– Amrdroid
Jan 3 at 7:26

@Amrnoid I added the code inside public class MainActivity extends AppCompatActivity implements View.OnTouchListener {}. Could you please explain how to inherit from the abstract activity? Sorry, my java knowledge is somewhat limited.

– Erlend K.H.
Jan 3 at 9:09

see my answer @Erlend K.H.

– Amrdroid
Jan 3 at 9:50

add a comment |

1 Answer
1

active

oldest

votes

abstract class you can only inherit it and write different implemnetaion for abstract method like onInputMethodPicked method in different derived classes
and by inheritance you can use any method from InputMethodActivity (parent class) in
MainActivity (child class) like pickInput method

   public class MainActivity extends InputMethodActivity implements     View.OnTouchListener {

     @Override

     protected  void onInputMethodPicked(){

     // your implemetion after pick 

    }

    @Override

    public void onClick(View view) {

     pickInput();

   }



   }

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

add a comment |

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   public class MainActivity extends InputMethodActivity implements     View.OnTouchListener {

     @Override

     protected  void onInputMethodPicked(){

     // your implemetion after pick 

    }

    @Override

    public void onClick(View view) {

     pickInput();

   }



   }

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

add a comment |

   public class MainActivity extends InputMethodActivity implements     View.OnTouchListener {

     @Override

     protected  void onInputMethodPicked(){

     // your implemetion after pick 

    }

    @Override

    public void onClick(View view) {

     pickInput();

   }



   }

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

add a comment |

   public class MainActivity extends InputMethodActivity implements     View.OnTouchListener {

     @Override

     protected  void onInputMethodPicked(){

     // your implemetion after pick 

    }

    @Override

    public void onClick(View view) {

     pickInput();

   }



   }

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

   public class MainActivity extends InputMethodActivity implements     View.OnTouchListener {

     @Override

     protected  void onInputMethodPicked(){

     // your implemetion after pick 

    }

    @Override

    public void onClick(View view) {

     pickInput();

   }



   }

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

edited Jan 3 at 10:06

answered Jan 3 at 9:47

Amrdroid

318110

answered Jan 3 at 9:47

Amrdroid

318110

answered Jan 3 at 9:47

Amrdroid

318110

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

add a comment |

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

Thanks for the suggestion, Amrnoid, but if I change public class MainActivity extends AppCompatActivity implements View.OnTouchListener {} to public class MainActivity extends InputMethodActivity implements View.OnTouchListener {}, I get a lot of new errors since other parts of the code require AppCompatActivity. However, I think we are close to making it work. Is there a way to extend MainActivity to both AppCompatActivity and InputMethodActivity?

– Erlend K.H.
Jan 3 at 10:33

if A class inherit from B class and B class inherit from C, C class is parent of A class by default then AppCompatActivity is parent class of MainActivity

– Amrdroid
Jan 3 at 10:42

java doesn’t provide support for multiple inheritance in classes so you can't extend MainActivity to both AppCompatActivity and InputMethodActivity

– Amrdroid
Jan 3 at 10:44

add a comment |

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