那些遇到过的问题

LinearLayout中的android TabHost

Zel*_*Ady 1 android android-tabhost

在寻找解决方案后,我决定重新问一个已经在这里提出的问题.

我有一个TabHost控件,我需要把它放在其他布局(LinearLayout)中.我收集谷歌给我们的例子(http://developer.android.com/resources/tutorials/views/hello-tabwidget.html)并做了同样的事情,唯一的区别是TabHost不是布局的根和显示视图的activity类不会扩展TabActivity,而是扩展Activity

我的xml是这样的:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TabHost 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"
            android:padding="5dp">
            <TabWidget android:id="@android:id/tabs"
                android:layout_width="fill_parent" android:layout_height="53px"
                android:tabStripEnabled="false" android:layout_margin="1px"
                android:background="#222222" />
            <FrameLayout android:id="@android:id/tabcontent"
                android:layout_width="fill_parent" android:layout_height="fill_parent"
                android:padding="5dp" />
        </LinearLayout>
    </TabHost>
</LinearLayout>
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而java类是这样的:

public class TabsExampleActivity extends Activity {

    TabHost tabHost;


    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initTabs();

    }


    private void initTabs() {
        Resources res = getResources();                     // Resource object to get Drawables
        tabHost = (TabHost) findViewById(R.id.tabhost);     // The activity TabHost

        TabHost.TabSpec spec;                               // Resusable TabSpec for each tab
        Intent intent;                                      // Reusable Intent for each tab        

        intent = new Intent("eu.pkg.tabsExample.BuildingTabActivity");
        spec = tabHost.newTabSpec("text").setIndicator("",
                          res.getDrawable(R.drawable.tab_text_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, ClipArtTabActivity.class);
        spec = tabHost.newTabSpec("clipart").setIndicator("",
                          res.getDrawable(R.drawable.tab_clipart_selector))
                      .setContent(intent);
        tabHost.addTab(spec);


        intent = new Intent().setClass(this, FrameSelectorTabActivity.class);
        spec = tabHost.newTabSpec("frame").setIndicator("",
                          res.getDrawable(R.drawable.tab_frame_selector))
                      .setContent(intent);
        tabHost.addTab(spec);



        intent = new Intent().setClass(this, BgSelectorTabActivity.class);
        spec = tabHost.newTabSpec("bg").setIndicator("",
                          res.getDrawable(R.drawable.tab_bg_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, BuildingTabActivity.class);
        spec = tabHost.newTabSpec("build").setIndicator("",
                          res.getDrawable(R.drawable.tab_build_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        tabHost.setCurrentTab(4);
    }
}
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如果我使用TabActivity作为基本活动,并且我使用TabHost作为root,那么代码运行良好,我看到标签...等.

只有在我扩展Activity时才会出现此问题,错误是:

04-11 18:53:38.874:ERROR/AndroidRuntime(32539):java.lang.RuntimeException:无法启动活动ComponentInfo {eu.pkg.tabsExample/eu.pkg.tabsExample.TabsExampleActivity}:java.lang.NullPointerException

问题是:如何在LinearLayout中托管TabHost？

编辑:

按照注释中的建议进行更改后,日志cat错误为:

04-11 20:52:01.993:ERROR/imdg81(28747):IsShutDownStarted()04-11 20:52:01.999:ERROR/SensorManager(28747):registerListener 4:gp2a光传感器延迟:240 04-11 20:52 :01.999:ERROR/SensorManager(28747):======= >>>传感器线程运行<<< ======== 04-11 20:52:02.075:ERROR/imdg81(28747): IsShutDownStarted()04-11 20:52:02.284:ERROR/LockPatternKeyguardView(28747):电话启动完成.因此可以为音乐播放器发送广播消息04-11 20:52:05.507:错误/ jdwp(3675):写入握手字节失败:断管(-1 of 14)04-11 20:52:05.609:ERROR/AndroidRuntime( 3675):FATAL EXCEPTION:main 04-11 20:52:05.609:ERROR/AndroidRuntime(3675):java.lang.RuntimeException:无法启动活动ComponentInfo {eu.pkg.tabsExample/eu.pkg.tabsExample.TabsExampleActivity}: java.lang.IllegalStateException:您是否忘记调用'public void setup(LocalActivityManager activityGroup)'？04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android. app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at android.app.ActivityThread.access $ 2300(ActivityThread.java:125)04-11 20:52 :05.609:ERROR/AndroidRuntime(3675):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:2033)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android.os.Handler. dispatchMessage(Handler.java:99)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at android.os.Looper.loop(Looper.java:123)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android.app.ActivityThread.main(ActivityThread.java:4627)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at java.lang.reflect.Method.invokeNative(Native Method) 04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at java.lang.reflect.Method.invoke(Method.java:521)04-11 2 0:52:05.609:ERROR/AndroidRuntime(3675):at com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:858)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at dalvik.system.NativeStart.main(Native Method)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):引起:java.lang.IllegalStateException:您是否忘记调用'public void setup(LocalActivityManager activityGroup)'？04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android.widget.TabHost $ IntentContentStrategy.getContentView(TabHost.java:654)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at android.widget.TabHost.setCurrentTab(TabHost.java:328)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):在android.widget.TabHost.addTab(TabHost.java:213)04-11 20: 52:05.609:ERROR/AndroidRuntime(3675):at eu.pkg.tabsExample.TabsExampleActivity.initTabs(TabsExampleActivity.java:43)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at eu.pkg.tabsExample .TabsExampleActivity.onCreate(TabsExampleActivity.java:27)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)04-11 20:52:05.609 :ERROR/AndroidRuntime(3675):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)04-11 20:52:05.609:ERROR/AndroidRuntime(3675):... 11更多

Zel*_*Ady 6

问题解决了.另一个stackoverflow问题中的用户207在其中一个评论中给出的正确解决方案是:

这是XML:

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TabHost android:id="@android: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"
            android:padding="5dp">
            <TabWidget android:id="@android:id/tabs"
                android:layout_width="fill_parent" android:layout_height="53px"
                android:tabStripEnabled="false" android:layout_margin="1px"
                android:background="#222222" />
            <FrameLayout android:id="@android:id/tabcontent"
                android:layout_width="fill_parent" android:layout_height="fill_parent"
                android:padding="5dp" />
        </LinearLayout>
    </TabHost>
</LinearLayout>
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和java文件:

package eu.pkg.tabsExample;

import android.app.Activity;
import android.app.LocalActivityManager;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TabHost;

public class TabsExampleActivity extends Activity {

    TabHost tabHost;
    LocalActivityManager mLocalActivityManager;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        initTabs(savedInstanceState);
    }

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

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

    private void initTabs(Bundle savedInstanceState) {
        Resources res = getResources();                     // Resource object to get Drawables
        tabHost = (TabHost) findViewById(android.R.id.tabhost);     // The activity TabHost
        mLocalActivityManager = new LocalActivityManager(this, false);
        mLocalActivityManager.dispatchCreate(savedInstanceState);
        tabHost.setup(mLocalActivityManager);

        TabHost.TabSpec spec;                               // Resusable TabSpec for each tab
        Intent intent;                                      // Reusable Intent for each tab        

        intent = new Intent("eu.pkg.tabsExample.BuildingTabActivity");
        spec = tabHost.newTabSpec("text").setIndicator("",
                          res.getDrawable(R.drawable.tab_text_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, ClipArtTabActivity.class);
        spec = tabHost.newTabSpec("clipart").setIndicator("",
                          res.getDrawable(R.drawable.tab_clipart_selector))
                      .setContent(intent);
        tabHost.addTab(spec);


        intent = new Intent().setClass(this, FrameSelectorTabActivity.class);
        spec = tabHost.newTabSpec("frame").setIndicator("",
                          res.getDrawable(R.drawable.tab_frame_selector))
                      .setContent(intent);
        tabHost.addTab(spec);



        intent = new Intent().setClass(this, BgSelectorTabActivity.class);
        spec = tabHost.newTabSpec("bg").setIndicator("",
                          res.getDrawable(R.drawable.tab_bg_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        intent = new Intent().setClass(this, BuildingTabActivity.class);
        spec = tabHost.newTabSpec("build").setIndicator("",
                          res.getDrawable(R.drawable.tab_build_selector))
                      .setContent(intent);
        tabHost.addTab(spec);

        tabHost.setCurrentTab(4);
    }
}
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场景背后的魔力在于这四行代码:

    tabHost = (TabHost) findViewById(android.R.id.tabhost);     // The activity TabHost
    mLocalActivityManager = new LocalActivityManager(this, false);
    mLocalActivityManager.dispatchCreate(savedInstanceState);
    tabHost.setup(mLocalActivityManager);
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谢谢大家对这个答案的贡献.

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