Android - Tabhost在Activity类中工作

时间:2010-11-17 22:00:09

标签: android android-tabhost

好的,我必须忽略一些愚蠢的东西,因为我无法让我的tabhost显示在我的Activity类中。当我尝试运行应用程序时,我正在接近可怕的力量。如果我扩展TabActivity,它会工作,但是我不能这样做 [请参阅下面的编辑],因为一旦我从原型项目中移动代码,它就会在一个继承自Activity的自定义类中。

这是XML布局:

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

以下是尝试创建和显示TabHost的类:

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.widget.TabHost;

public class my_proto extends Activity
{   
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState)
   {
      Log.i(this.toString(), "OnCreate");

      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);

      Log.i(this.toString(), "get tab host");
      TabHost host = (TabHost)findViewById(R.id.tabhost); 
      host.setup();

      Log.i(this.toString(), "add tabs");
      host.addTab(host.newTabSpec("one")
                      .setIndicator("First Results")
                      .setContent(new Intent(this, FirstResultsListViewActivity.class)));

      host.addTab(host.newTabSpec("two")
                      .setIndicator("Second Results")
                      .setContent(new Intent(this, SecondResultsListViewActivity.class)));

      Log.i(this.toString(), "adjust tab size");
      host.getTabWidget().getChildAt(0).getLayoutParams().height = 35;
      host.getTabWidget().getChildAt(1).getLayoutParams().height = 35;

   }// end onCreate

}// end class my_proto

这是我在日志中收到的错误。

11-17 16:49:51.271: INFO/com.my_proto.my_proto@43b80b50(1302): OnCreate
11-17 16:49:51.472: INFO/com.my_proto.my_proto@43b80b50(1302): get tab host
11-17 16:49:51.480: INFO/com.my_proto.my_proto@43b80b50(1302): add tabs
11-17 16:49:51.521: DEBUG/AndroidRuntime(1302): Shutting down VM
11-17 16:49:51.521: WARN/dalvikvm(1302): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
11-17 16:49:51.530: ERROR/AndroidRuntime(1302): Uncaught handler: thread main exiting due to uncaught exception
11-17 16:49:51.552: ERROR/AndroidRuntime(1302): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my_proto/com.my_proto.my_proto}: java.lang.IllegalStateException: Did you forget to call 'public void setup(LocalActivityManager activityGroup)'?
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2496)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2512)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread.access$2200(ActivityThread.java:119)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1863)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.os.Handler.dispatchMessage(Handler.java:99)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.os.Looper.loop(Looper.java:123)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread.main(ActivityThread.java:4363)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at java.lang.reflect.Method.invokeNative(Native Method)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at java.lang.reflect.Method.invoke(Method.java:521)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:860)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at dalvik.system.NativeStart.main(Native Method)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302): Caused by: java.lang.IllegalStateException: Did you forget to call 'public void setup(LocalActivityManager activityGroup)'?
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:646)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.widget.TabHost.setCurrentTab(TabHost.java:320)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.widget.TabHost.addTab(TabHost.java:213)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at com.mc_proto.mc_proto.onCreate(my_proto.java:29)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2459)
11-17 16:49:51.552: ERROR/AndroidRuntime(1302):     ... 11 more

抱怨没有打电话给设置,但我打电话给它。还有另一种版本的设置需要某种LocalActivityMananger。我已经尝试更换呼叫以设置下面的呼叫,但没有运气。

LocalActivityManager mLocalActivityManager = new LocalActivityManager(this, false);
host.setup(mLocalActivityManager);

[edit]上面的调用不起作用所以我把它拿回来了。虽然我记录了一个新的错误。

11-17 20:24:58.382: ERROR/AndroidRuntime(1432): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.my_proto/com.my_proto.my_proto}: java.lang.IllegalStateException: Activities can't be added until the containing group has been created.

[edit]基于下面的一些评论,我意识到我需要更清楚为什么我不能继承TabActivity。一旦我有原型工作,我需要将其移植到继承自Activity的现有应用程序的屏幕。我需要将TabHost加载到该Activity中的Layout中。它基本上是一个带有一行状态图标的LinearLayout,跟着我的一个带有Tabhost的LinearLayout。我知道,如果我能够开展这项工作,我可以进入下一阶段。谢谢!

---------------------------
|      status icons       |
---------------------------
|    Tab, Tab, Tab        |
|                         |
|                         |
|                         | 
---------------------------
|      status icons       |
---------------------------

7 个答案:

答案 0 :(得分:30)

好的我明白了。显然,TabActivity扩展了ActivityGroup,扩展了Activity。但是在您的代码中,您的类会扩展Activity,而不是活动组。

所以有两种选择:

1)如果您希望标签内容成为活动,请让您的课程延伸ActivityGroup(而不是Activity)。然后,您对设置的调用应为host.setup(getLocalActivityManager());

这样您就可以模拟TabActivity源代码。

2)如果您可以将标签内容设为观看次数(与活动相比),请将您的课程保持为Activity,并致电setup()。但是对于setContent部分,请执行以下操作:

host.addTab(host.newTabSpec("two")
                .setIndicator("Second Results")
                .setContent(new TabContentFactory() {

                    public View createTabContent(String tag) {
                        return new TextView(TestActivity.this);
                    }
                }));

然后在createTabContent中定义你的列表视图(这通常是我做的 - 我更喜欢使用视图而不是活动作为标签的内容)。

答案 1 :(得分:10)

如果你有一个场景,你需要为你的Tabhost使用Activity类,你可以尝试以下它可以工作。

    tabHost = (TabHost) findViewById(R.id.tabhost); //here tabHost will be your Tabhost
    LocalActivityManager mLocalActivityManager = new LocalActivityManager(mActivity, false);
    mLocalActivityManager.dispatchCreate(state); // state will be bundle your activity state which you get in onCreate
    tabHost.setup(mLocalActivityManager);

答案 2 :(得分:8)

有同样的问题:这个问题有助于Android: TabHost without TabActivity

显然,您只需要添加一行:

LocalActivityManager mLocalActivityManager = new LocalActivityManager(this, false);
mLocalActivityManager.dispatchCreate(savedInstanceState);
host.setup(mLocalActivityManager);

答案 3 :(得分:2)

android:id="@+id/tabhost"对我不起作用。我必须写android:id="@android:id/tabhost"

答案 4 :(得分:1)

我将课程改为

public class my_proto extends ActivityGroup

并更改以下内容:

this.mHost = (TabHost) findViewById(R.id.tabhost);
this.mHost.setup(getLocalActivityManager());

对我来说似乎没问题

答案 5 :(得分:0)

更改具有以下内容的类声明:

public class my_proto extends Activity

public class my_proto extends TabActivity

答案 6 :(得分:0)

tommie说的是真的。您还应该查看此处的教程http://developer.android.com/resources/tutorials/views/hello-tabwidget.html