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 |
---------------------------
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
到
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