42

我想在扩展 TabActivity 的情况下创建选项卡。(原因是 TabActivity 无法处理看起来的自定义标题栏)。我有

public class startTab extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mylayout);
        Resources res = getResources();
        LocalActivityManager mlam = new LocalActivityManager(this, false);
        TabHost tabHost = (TabHost) findViewById(R.id.tabhost);
        tabHost.setup(mlam);
        TabHost.TabSpec spec;
        Intent intent;

    intent = new Intent().setClass(this, Show1.class);
    spec = tabHost.newTabSpec("Items").setIndicator("Items", res.getDrawable(R.drawable.items32_ldpi)).setContent(intent);
    tabHost.addTab(spec);

    intent = new Intent().setClass(this, Show2.class);
    spec = tabHost.newTabSpec("Users").setIndicator("Users",res.getDrawable(R.drawable.user32_ldpi)).setContent(intent);
    tabHost.addTab(spec);
}

}

我得到的错误是

    07-02 07:11:12.715: ERROR/AndroidRuntime(411): 
Caused by: java.lang.IllegalStateException: Activities can't be added until the containing group has been created.

视图的 xml 是

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
 android:id="@+id/tabhost" android:orientation="vertical" android:layout_width="fill_parent"
 android:layout_height="fill_parent" >
 <LinearLayout android:orientation="vertical"
  android:layout_width="fill_parent" android:layout_height="fill_parent"
  android:paddingTop="5dip">
  <TabWidget android:id="@android:id/tabs"
   android:layout_width="fill_parent" android:layout_height="fill_parent"></TabWidget>
  <FrameLayout android:id="@android:id/tabcontent"
   android:layout_width="fill_parent" android:layout_height="fill_parent"
   android:paddingTop="5dip">
  </FrameLayout>
 </LinearLayout>
</TabHost>

我在某处读到我必须使用 LocalActivityManager,我认为我在那里遗漏了一些东西。任何人的想法?

谢谢!

4

4 回答 4

86

在调用 tabHost.setup(mLocalActivityManager); 之前 你需要添加这一行。

mlam.dispatchCreate(savedInstanceState);
tabHost.setup(mlam );

同样,您需要为 onResume 添加,

mlam.dispatchResume(); 

暂停(),

 mlam.dispatchPause(isFinishing());
于 2011-02-23T23:45:25.057 回答
13

请考虑将Views其用作选项卡的内容。这不仅会导致更少的代码、更少的堆空间消耗、更少的堆栈空间消耗和更低的 CPU 利用率,它还会让你克服这个问题。以下是展示此技术的两个 示例。

于 2010-07-02T07:42:46.607 回答
4
public class ScoreboardActivity extends Activity {
    LocalActivityManager mlam;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_scoreboard);
        mlam = new LocalActivityManager(this, false);
        mlam.dispatchCreate(savedInstanceState);
        TabHost th = (TabHost) findViewById(android.R.id.tabhost);
        th.setup(mlam);
        th.addTab(th.newTabSpec("Numpad").setIndicator("Numpad").setContent(R.id.tab1));
        th.addTab(th.newTabSpec("CardCount").setIndicator("CardCount").setContent(R.id.tab2));
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_scoreboard, menu);
        return true;


    }
    @Override
    protected void onResume(){
        super.onResume();
        mlam.dispatchResume();
    }

    @Override
    protected void onPause(){
        super.onPause();
        mlam.dispatchPause(isFinishing());
    }

}
于 2013-01-01T15:47:38.167 回答
1

尽管有设计考虑,但以下内容根本不起作用,API 似乎表明这setContent(Intent i)是有效的。这在活动扩展时有效TabActivity,但是,扩展Activity和添加setup()调用会导致exception at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:649)

有趣的是,LogCat 建议我忘了打电话setup()

mTabHost = (TabHost) findViewById(android.R.id.tabhost);
mTabHost.setup();

Intent tab1Intent = new Intent(this, ActivityOne.class);
Button tab1View = new Button(this);
tab1View.setText("Activity 1");
  mTabHost.addTab(mTabHost.newTabSpec("tab_1").setIndicator(tab1View).setContent(tab1Intent));
于 2010-08-19T15:55:46.453 回答