【发布时间】:2010-11-17 22:00:09
【问题描述】:
好的,我一定忽略了一些愚蠢的事情,因为我无法让我的 tabhost 显示在我的 Activity 类中。当我尝试运行该应用程序时,我正在接近可怕的力量。如果我扩展 TabActivity,它将起作用,但我不能这样做 [请参阅下面的编辑],因为一旦我从原型项目中移动代码,它将位于从 Activity 继承的自定义类中。
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>
这是试图创建和显示 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
这是我在日志中得到的错误。
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
它抱怨没有调用设置,但我正在调用它。还有另一个版本的设置需要某种 LocalActivityMananger。我尝试替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.
[编辑] 基于下面的一些 cmets,我意识到我需要更清楚为什么我不能从 TabActivity 继承。一旦我有原型工作,我需要将它移植到从 Activity 继承的现有应用程序的屏幕中。我需要将 TabHost 加载到该 Activity 中的布局中。它基本上是带有一排状态图标的 LinearLayout,然后是带有 Tabhost 的 LinearLayout。我知道如果我能完成这项工作,我就可以进入下一个阶段。谢谢!
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| status icons |
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| Tab, Tab, Tab |
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| status icons |
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