Android - Tabhost 在 Activity 类中工作 [英] Android - Tabhost working in Activity class
问题描述
好吧,我一定是忽略了一些愚蠢的事情,因为我无法让我的 tabhost 显示在我的活动类中.当我尝试运行该应用程序时,我得到了可怕的力量.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] 因为一旦我从我的原型项目中移动代码,它将位于从 Activity 继承的自定义类中.
OK, I must be overlooking something silly because I am unable to get my tabhost to display in my Activity class. I am getting the dreaded force close when I try to run the app. It will work if i extend TabActivity, but I can't do that [see edit below] because once I move the code from my prototype project its going to be in a custom class that inherits from Activity.
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>
这是尝试创建和显示 TabHost 的类:
And here is the class that is trying to create and display the TabHost:
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.
This is the error I get in the log.
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 setup,但我正在调用它.还有另一个版本的安装程序需要某种 LocalActivityMananger.我曾尝试更换呼叫以设置下面的呼叫,但没有运气.
Its complaining about not calling setup, but I am calling it. There is another version of setup that needs some kind of LocalActivityMananger. I have tried replacing the call to setup the call below but no luck.
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.
[edit] The call above didn't work so I took it back out. Although I was getting a new error logged.
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.
根据下面的一些评论,我意识到我需要更清楚为什么我不能从 TabActivity 继承.一旦我的原型工作,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 加载到该活动中的布局中.它基本上是一个带有一行状态图标的 LinearLayout,然后是我的带有 Tabhost 的 LinearLayout.我知道,如果我能做到这一点,我就可以进入下一阶段.谢谢!
[edit] Based on some of the comments below I realized I need to be clearer about why I can't inherit from TabActivity. Once I have the prototype working I need to port this into an existing app's screen that inherits from Activity. I will need to load the TabHost into a Layout within that Activity. It will basically be a LinearLayout with a row of status icons, followed my a LinearLayout with the Tabhost in it. I know that if I can get this working I can move onto the next phase. Thanks!
---------------------------
| status icons |
---------------------------
| Tab, Tab, Tab |
| |
| |
| |
---------------------------
| status icons |
---------------------------
推荐答案
好的,我想通了.显然,TabActivity
扩展了 ActivityGroup
,它扩展了 Activity
.但是在您的代码中,您的类扩展了 Activity
,它不是活动组.
Ok I figured it out. Apparently, TabActivity
extends ActivityGroup
, which extends Activity
. But in your code your class extends Activity
which is not an activity group.
所以有两种选择:
1) 如果您希望标签内容是活动,请让您的类扩展 ActivityGroup
(而不是 Activity
).那么你对 setup 的调用应该是 host.setup(getLocalActivityManager());
1) If you want the tab content to be activities, have your class extend ActivityGroup
(instead of Activity
). Then your call to setup should be host.setup(getLocalActivityManager());
通过这种方式,您可以模拟 TabActivity
源代码.
This way you are emulating the TabActivity
source code.
2) 如果你可以让你的标签内容是视图(vs 活动),保持你的类从 Activity
扩展,并保持对 setup()
的调用.但是对于 setContent 部分,请执行以下操作:
2) If you can have your tab content be views (vs activities), keep your class as extending from Activity
, and keep your call to setup()
. But for the setContent part do something like this:
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 中定义您的列表视图(这通常是我所做的 - 我更喜欢使用视图而不是活动作为选项卡的内容).
And then define your list view inside createTabContent (that's usually what I do - I prefer using views instead of activities as the contents of the tabs).
这篇关于Android - Tabhost 在 Activity 类中工作的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!