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Android:設置自定義標題/操作欄-不起作用

[英]Android: Setting Custom Title/Action Bar - not working

我正在嘗試如下設置自定義標題欄(請注意,此活動從FragmentActivity擴展,如果很重要):

...
import android.support.v4.app.FragmentActivity;
...
public class MyActivity extends FragmentActivity {
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        android.app.ActionBar actionBar = this.getActionBar();
        LayoutInflater inflator = (LayoutInflater) this
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View v = inflator.inflate(R.layout.window_title, null);    
        TextView tv = (TextView) v.findViewById(R.id.titlex);    
        tv.setText("My Title");

        actionBar.setCustomView(v);                

        setContentView(R.layout.myactivity);
    }
    ...
}

但是我根本看不到“自定義標題欄”,缺少什么?

設置actionbar.setDisplayShowCustomEnabled(true); actionBar.setCustomView(v);之前actionBar.setCustomView(v);

編輯

在這里,我過去了自定義ActionBar創建的代碼

// Action Bar Customization
    ActionBar ab =act.getActionBar();

    ColorDrawable colorDrawable = new ColorDrawable(act.getResources().getColor(color.ActionBar_bg));
    ab.setBackgroundDrawable(colorDrawable);


    ab.setDisplayShowTitleEnabled(false); // disables default title on
                                            // actionbar.
    ab.setDisplayShowCustomEnabled(true); // enables custom view.
    ab.setDisplayShowHomeEnabled(false); // hides app icon.
    ab.setTitle("");
    // Inflating Layout
    LayoutInflater inflater = (LayoutInflater) act.getActionBar()
            .getThemedContext().getSystemService(LAYOUT_INFLATER_SERVICE);

    View customActionBar = inflater.inflate(R.layout.actionbar_layout, null);
    txtUserName=(TextView)customActionBar.findViewById(R.id.txtUserName);

    ab.setCustomView(customActionBar);

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