Call toolbar for each operation

Question

My application has a toolbar that should be present in every view. I am currently performing the following actions in my method onCreate()for every action that I have:

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

Is there a need to do this in every method onCreate()in every event, or is there an easier way? Also, as a side question, how can I implement a back function in the toolbar that returns a single action to the user if they click on it?

Answer 1

Create a base class for Activity

public abstract class BaseActivity extends AppCompatActivity {

  Toolbar toolbar;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(getLayoutResource());
    configureToolbar();
  }

  protected abstract int getLayoutResource();

  private void configureToolbar() {
    toolbar = (Toolbar) findViewById(R.id.toolbar);
    if (toolbar != null) {
      setSupportActionBar(toolbar);
      getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    }
  }

  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()) {
      case android.R.id.home:
        FragmentManager fm = getSupportFragmentManager();
        if (fm != null && fm.getBackStackEntryCount() > 0) {
          fm.popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
        } else {
          finish();
        }
        return true;
      default:
        return super.onOptionsItemSelected(item);
    }
  }
}

Activity BaseActivity, ToolBar .

, ToolBar layout.

Edit:

getLayoutResource() Activity .

public class MainActivity extends BaseActivity {

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

  @Override
  public int getLayoutResource() {
    return R.layout.activity_main;
  }

Answer 2

. getLayoutResources() "setContentView()"

public abstract class BaseActivity extends AppCompatActivity {

    Toolbar toolbar;

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

    protected boolean useToolbar() {
        return true;
    }

    @Override
    public void setContentView(int layoutResID) {
        View view = getLayoutInflater().inflate(layoutResID, null);
        configureToolbar(view);
        super.setContentView(view);
    }

    private void configureToolbar(View view) {
        toolbar = (Toolbar) view.findViewById(R.id.toolbar);
        if (toolbar != null) {
            if (useToolbar()) {
                setSupportActionBar(toolbar);
                getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            } else {
                toolbar.setVisibility(View.GONE);
            }
        }
    }
}

BaseActivity. , useToolbar().

Activity.xml

<include layout="@layout/toolbar" />

toolbar.xml

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

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="?attr/colorPrimary"
        app:layout_scrollFlags="scroll|enterAlways"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
</merge>

Answer 3

Activity, BaseActivity, AppCompatActivity ActionBarActivity () Toolbar BaseActivity.

public class BaseActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
    }
}

Fragment, BaseFragment, Fragment Toolbar BaseFragment.

public class BaseFragment extends Fragment {

   View main;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        main = inflater.inflate(R.layout.fragment_about, container, false);
        Toolbar toolbar = (Toolbar) main.findViewById(R.id.toolbar);
        getActivity().setSupportActionBar(toolbar);
        return main;
    }
}

main XML Toolbar xml-.

(Activity) extends BaseActivity AppCompatActivity ActionBarActivity, Toolbar .

public class YourActivity extends BaseActivity{
//your code
}

EDIT1:

main.xml

 <RelativeLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:theme="@style/toolbarTheme"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/green"
            android:minHeight="?attr/actionBarSize" />

 </RelativeLayout>

EDIT2:

getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);

setSupportActionBar(toolbar); BaseActivity.

, !

Answer 4

, , OO.

.

public abstract class FragmentBase extends Fragment {

    protected void settingsToolbar(View rootView) {

        Toolbar toolbar = (Toolbar) rootView.findViewById(R.id.toolbar);

        ((AppCompatActivity) getActivity()).setSupportActionBar(toolbar);
        final ActionBar actionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
        if (actionBar != null) {
            // TODO add your code and your requirements
            actionBar.setDisplayShowTitleEnabled(true);
            actionBar.setDisplayHomeAsUpEnabled(true);

        }
    }




}

, .

Answer 5

. .

FirtActivity extends BaseActivity

SecondActivity extends BaseActivity

In the basic "Back to Back" button, click the "Run" button to check, as shown below.

if(this instance of FirstActivity){
  //do stuff here
}else if(this instance of SecondActivity){
 //do stuff here
}