Adding actionbar to listactivity

问题:

Hello so I created a list and I want to add action bar. I am quite new to android so I would like to know how to add action bar while using ListActivity. Any help will be appreciated. Thanks My code:

     public class MainActivity extends ListActivity {

     ArrayList<Item> items = new ArrayList<Item>();

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


        items.add(new SectionItem("2x2 Matrices"));
        items.add(new EntryItem("Adding 2 Matrices"));
        items.add(new EntryItem("Subtracting 2 Matrices"));
        items.add(new EntryItem("Multiplying 2 Matrices"));
        items.add(new EntryItem("Multiplying by a constant"));
        items.add(new EntryItem("Dividing 2 Matrices"));
        items.add(new EntryItem("Negative of a Matrix"));
        items.add(new EntryItem("Inverse of a Matrix"));
        items.add(new EntryItem("Determinant of a Matrix"));

        /*Section2*/
        items.add(new SectionItem("3x3 Matrices"));
        items.add(new EntryItem("Item 4"));
        items.add(new EntryItem("Item 5"));
        items.add(new EntryItem("Item 6"));
        items.add(new EntryItem("Item 7"));
        /*Section3*/
        items.add(new SectionItem("Category 3"));
        items.add(new EntryItem("Item 8"));
        items.add(new EntryItem("Item 9"));
        items.add(new EntryItem("Item 10"));
        items.add(new EntryItem("Item 11"));
        items.add(new EntryItem("Item 12"));

        EntryAdapter adapter = new EntryAdapter(this, items);

        setListAdapter(adapter);
    }

}

回答1:

Then in your activity's onCreateOptionsMenu() method, inflate the menu resource into the given Menu to add each item to the action bar:

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu items for use in the action bar
    MenuInflater inflater = getMenuInflater();
    inflater.inflate(R.menu.main_activity_actions, menu);
    return super.onCreateOptionsMenu(menu);
}

More info for action bar

回答2:

First- Make sure your Android minimum API-14 or later.

Then, add android:theme="@android:style/Theme.Holo.Light.DarkActionBar" under your ListView_Activity in AndroidManifest.xml class.

Example

        <activity android:name=".Your_ListView_Activity"
                  android:theme="@android:style/Theme.Holo.Light.DarkActionBar"
                  android:label="ListView_Activity_Label">

回答3:

You can use Holo Themes, you need only in this screen?

In Android manifest:

For only one screen, put atribute theme, like this:

<activity
android:theme="@android:style/Theme.Holo.Light.DarkActionBar">
</activity>

For all screen, put atribute theme in application tag.

<application
android:theme="@style/My_Theme" >

Also you can make a custom theme based on Holo Light Theme.

Ex:

android:theme="@style/My_Theme" >

In styles.xml

<style name="My_Theme" parent="@android:style/Theme.Holo.Light.NoActionBar"></style>

回答4:

Here is a good way:

In your layout file: activity_main.xml

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

<ListView
    android:id="@+id/list"
    android:layout_height="wrap_content"
    android:layout_width="match_parent">
</ListView>

Now for your activity:

public class MainActivity extends ActionBarActivity
{
    private ListView listView;
    private ListAdapter myAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.list);
        myAdapter = new ListAdapter(getApplicationContext());
        listView.setAdapter(myAdapter);

Good Luck!