'분류 전체보기'에 해당되는 글 256건

public class MainActivity extends AppCompatActivity {

    ActionBar actionBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        actionBar = getSupportActionBar();
        actionBar.setLogo(R.drawable.home);
        actionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_HOME|ActionBar.DISPLAY_USE_LOGO);
    }

}

* res > menu(폴더명 "menu"로 생성) > menu_main.xml 추가

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/menu_refresh"
        android:title="새로고침"
        android:icon="@drawable/refresh"
        app:showAsAction="always" />

    <item
        android:id="@+id/menu_search"
        android:title="새로고침"
        android:icon="@drawable/search"
        app:showAsAction="always" />

    <item
        android:id="@+id/menu_settings"
        android:title="새로고침"
        android:icon="@drawable/setting"
        app:showAsAction="always" />

</menu>

* onCreateOptionsMenu, onOptionsItemSelected 메서드 재정의

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.menu_main, menu);

        return true;
    }

    @Override
    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
        int curId = item.getItemId();

        switch (curId) {
            case R.id.menu_refresh:
                showToast("새로고침 메뉴 선택됨");
                break;
            case R.id.menu_search:
                showToast("검색 메뉴 선택됨");
                break;
            case R.id.menu_settings:
                showToast("설정 메뉴 선택됨");
                break;
            default:
                break;
        }

        return super.onOptionsItemSelected(item);
    }

    public void showToast(String data) {
        Toast.makeText(this, data, Toast.LENGTH_LONG).show();
    }

}

* MainActivity.java

public class MainActivity extends AppCompatActivity implements Common {

    MainFragment mainFragment;
    MenuFragment menuFragment;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mainFragment = (MainFragment) getSupportFragmentManager().findFragmentById(R.id.mainFragment);
        menuFragment = new MenuFragment();
    }

    @Override
    public void onFragmentChanged(int index) {
        if (index == 0) {
            getSupportFragmentManager().beginTransaction().replace(R.id.container, mainFragment).commit();
        } else if (index == 1) {
            getSupportFragmentManager().beginTransaction().replace(R.id.container, menuFragment).commit();
        }
    }
}

* Common Interface.java

public interface Common {
    public void onFragmentChanged(int index);
}

* MainFragment.java

public class MainFragment extends Fragment {

    Common common;

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);

        if (context instanceof Common) {
            common = (Common) context;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_main, container, false);

        Button button = rootView.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                common.onFragmentChanged(1);
            }
        });

        return rootView;
    }

}

* MenuFragment.java

public class MenuFragment extends Fragment {

    Common common;

    @Override
    public void onAttach(@NonNull Context context) {
        super.onAttach(context);

        if (context instanceof Common) {
            common = (Common) context;
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        ViewGroup rootView = (ViewGroup) inflater.inflate(R.layout.fragment_menu, container, false);

        Button button = rootView.findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                common.onFragmentChanged(1);
            }
        });

        return rootView;
    }

}

@Override
protected void onPause() {
    super.onPause();
    
    SharedPreferences pref = getSharedPreferences("pref", Activity.MODE_PRIVATE);
    SharedPreferences.Editor editor = pref.edit();
    editor.putString("name", editText.getText().toString());
    editor.commit();
}

@Override
protected void onResume() {
    super.onResume();
    
    SharedPreferences pref = getSharedPreferences("pref", Activity.MODE_PRIVATE);
    if (pref != null) {
        String name = pref.getString("name", "");
        editText.setText(name);
    }
}

* MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button button = findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(), MenuActivity.class);
                startActivityForResult(intent, 101);
            }
        });
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == 101) {
            if (data != null) {
                String name =data.getStringExtra("name");
                if (name != null) {
                    Toast.makeText(getApplicationContext(), "응답받은 데이터 : " + name, Toast.LENGTH_LONG).show();
                }
            }

        }
    }
}

* MenuActivity.java

public class MenuActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_menu);

        Button button2 = findViewById(R.id.button2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.putExtra("name", "mike");
                setResult(RESULT_OK, intent);

                finish();
            }
        });
    }
}