How to get activity title name through programmatically java android

Question

In my android application, I set title name of an activity in AndroidManifest.xaml like below:

<activity
       android:name=".LoginSuccess"
       android:label="Home" > // this is title name
</activity>

And activity title name is Home and I wan to get this actitvity title name in my actitvity's java page, I am trying like below:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_sample);

        android.support.v7.app.ActionBar actionBar = getSupportActionBar();
        pageTitle = actionBar.getTitle().toString(); 
}

But I am getting below exception at this line pageTitle = actionBar.getTitle().toString(); :

java.lang.NullPointerException

Kindly suggest me, what can I do to resolve this issue,

waiting for reply.

Thanks.

Answer 1

You can also get like this from PackageManager

ActivityInfo activityInfo = getPackageManager().getActivityInfo(
                getComponentName(), PackageManager.GET_META_DATA);
String title = activityInfo.loadLabel(getPackageManager())
                .toString();

Answer 2

ActionBar actionBar = getActionBar();
String classTitle = actionBar.getTitle().toString(); 

Answer 3

It's because you trying to get title before it creates.

You can try do it with delay in your onCreate method:

protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.fragment_sample);

         new Handler().postDelayed(new Runnable() {

            @Override
            public void run() { 

                 android.support.v7.app.ActionBar actionBar = getSupportActionBar();
                 pageTitle = actionBar.getTitle().toString(); 
            }
        }, 500);
}

It works fine.

Answer 4

在Strings.xml中定义你的字符串，然后尝试做延迟它可能工作相同的事情。

Answer 5

I know it´s been a while since the last post but for those (like me) searching a solution for this issue.... you don´t need action bar to get the Manifest´s activities label, just do the follow in your Activity´s onStart:

@Override
protected void onStart() {
    super.onStart();
    String pageTitle = getTitle();// it´s not available in onCreate yet
}

Answer 6

请尝试以下代码以获取类文件中的当前活动名称。

this.getClass().getSimpleName()