Sherlock操作栏中的TextView

Question

I have an app where I want to display the current chapter number in the action bar (sherlock). My menu.xml looks like:

<menu xmlns:android="http://schemas.android.com/apk/res/android" >

    <item
        android:id="@+id/TextView01"
        android:title=""/>

</menu>

I am getting NullPointerException when using the following code:

titleView = (TextView) findViewById(R.id.TextView01);
titleView.setText(chapterno);

Any idea, how can we show text in sherlock action bar and update it dynamically.

The ActionBar looks like:

Answer 1

You have to use a custom layout in the action bar and not a menu item to achieve this.

in onCreate()

ActionBar mActionBar = getSupportActionBar();
mActionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
mActionBar.setCustomView(R.layout.actionbar_number);

Your layout should be:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
    android:layout_gravity="right"
    android:layout_marginRight="@dimen/marginMedium"
    android:gravity="center_vertical"
    android:text="0"
    android:textColor="@color/actionbar_number"
    android:textSize="28dp"
    android:textStyle="bold" />

To update the number:

TextView chapterNumber = (TextView) getSupportActionBar().getCustomView();
chapterNumber.setText(String.valueOf(number));

UPDATE To add menu action item you should be able to do that as normal, just be careful, the positioning of your custom layout may overlap menu items or hide then if they appear in the action bar.

in menu.xml

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

    <item
        android:id="@+id/menu_share"
        android:actionProviderClass="com.actionbarsherlock.widget.ShareActionProvider"
        android:icon="@drawable/ic_menu_share"
        android:showAsAction="ifRoom"
        android:title="@string/share"
        android:visible="false"/>

</menu>

Then in your activity.

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    com.actionbarsherlock.view.MenuInflater inflater = getSupportMenuInflater();
    inflater.inflate(R.menu.menu, menu);

    // Locate MenuItem with ShareActionProvider
    MenuItem item = menu.findItem(R.id.menu_share);
    ShareActionProvider shareActionProvider = (ShareActionProvider) item.getActionProvider(); //line 387

    Intent shareIntent = new Intent(Intent.ACTION_SEND);
    shareIntent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
    shareIntent.setType("text/plain");

    shareIntent.putExtra(Intent.EXTRA_TEXT, "Test");
    shareIntent.putExtra(Intent.EXTRA_SUBJECT, "Test");

    shareActionProvider.setShareIntent(shareIntent);

    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {

    switch (item.getItemId()) {

    case android.R.id.home:
        onBackPressed();
        break;

    case R.id.menu_share:
        // EXAMPLE OF WHAT YOU CAN DO
        //          Intent sharingIntent = new Intent(Intent.ACTION_SEND);
        //          sharingIntent.setType("image/png");
        //          sharingIntent.putExtra(android.content.Intent.EXTRA_STREAM, Uri.fromFile(f));
        //          //sharingIntent.putExtra(android.content.Intent.EXTRA_SUBJECT, "Subject Here");
        //          //sharingIntent.putExtra(android.content.Intent.EXTRA_TEXT, "Body");
        //          startActivity(Intent.createChooser(sharingIntent, "Share via"));

        break;

    default:
        break;

    }
    return super.onOptionsItemSelected(item);
}