Android - TabHost / TabWidget



我是Android新手,并尝试移植iOS应用程序。不幸的是,我在使基本设置正常工作时遇到了一些麻烦。

我正在尝试实现与本教程类似的导航:教程

它或多或少是一个简单的TabHost,包含多个选项卡而不是使用

tabHost.addTab(tabHost.newTabSpec("settings").setIndicator("settings").setContent(R.id.tab1));

就像在教程中一样,我想用这样的类初始化我的选项卡:

tabHost.addTab(tabHost.newTabSpec("settings").setIndicator("settings").setContent(new Intent(this, SettingsActivity.class)));

不幸的是,当我单击"设置选项卡"时,该应用程序崩溃了。

这是我到目前为止的代码:

MainActivity:
package xxx;
import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
public class MainActivity extends Activity implements OnTabChangeListener
{
    @Override
    protected void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initTabs();
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) 
    {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.main, menu);
        return true;
    }

    private void initTabs()
    {
        TabHost tabHost = (TabHost)findViewById(android.R.id.tabhost);
        tabHost.setup();

        tabHost.addTab(tabHost.newTabSpec("Übersicht").setIndicator("Übersicht").setContent(R.id.tab1)); // <- is working fine
        tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(new Intent(this, SettingsActivity.class))); <- crash
        tabHost.setOnTabChangedListener(this);
        tabHost.setCurrentTab(0);
    }

    @Override
    public void onTabChanged(String tabId) 
    {
        // TODO Auto-generated method stub  
    }
}

activity_main.xml:

<RelativeLayout xmlns:android=
    xmlns:tools=""
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >
    <TabHost
        android:id="@android:id/tabhost"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true" >
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical" >
            <TabWidget
                android:id="@android:id/tabs"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >
            </TabWidget>
            <FrameLayout
                android:id="@android:id/tabcontent"
                android:layout_width="match_parent"
                android:layout_height="match_parent" >
                <LinearLayout
                    android:id="@+id/tab1"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal" >
                </LinearLayout>
                <LinearLayout
                    android:id="@+id/tab2"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal" >
                </LinearLayout>
                <LinearLayout
                    android:id="@+id/tab3"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal" >
                </LinearLayout>
                <LinearLayout
                    android:id="@+id/tab4"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:orientation="horizontal" >
                </LinearLayout>                
            </FrameLayout>
        </LinearLayout>
    </TabHost>
</RelativeLayout>

设置活动:

package xxx;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class SettingsActivity extends Activity
{
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        TextView tv = new TextView(this);
        tv.setText("This is tab 2");
        setContentView(tv);
    }   
}

来自日志猫的错误消息:

10-15 03:52:22.711: W/dalvikvm(889): threadid=1: 线程退出 未捕获的异常 (group=0x41465700) 10-15 03:52:22.851: E/Android运行时(889): 致命异常: main 10-15 03:52:22.851: E/AndroidRuntime(889): java.lang.IllegalStateException: Do You Forget(英语:Do You Forget) 调用"公共无效设置(本地活动管理器活动组)"?10-15 03:52:22.851: E/Android运行时(889): at android.widget.TabHost$IntentContentStrategy.getContentView(TabHost.java:747) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.widget.TabHost.setCurrentTab(TabHost.java:413) 10-15 03:52:22.851: E/Android运行时(889): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:154) 10-15 03:52:22.851: E/Android运行时(889): at android.widget.TabWidget$TabClickListener.onClick(TabWidget.java:546) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.view.view.performClick(View.java:4240) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.view.view$PerformClick.run(View.java:17721) 10-15 03:52:22.851: E/Android运行时(889): at android.os.Handler.handleCallback(Handler.java:730) 10-15 03:52:22.851: E/Android运行时(889): at android.os.Handler.dispatchMessage(Handler.java:92) 10-15 03:52:22.851: E/Android运行时(889): at android.os.Looper.loop(Looper.java:137) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-15 03:52:22.851: E/Android运行时(889): at java.lang.reflect.Method.invokeNative(Native Method) 10-15 03:52:22.851: E/Android运行时(889): at java.lang.reflect.Method.invoke(Method.java:525) 10-15 03:52:22.851: E/AndroidRuntime(889): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-15 03:52:22.851: E/AndroidRuntime(889): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-15 03:52:22.851: E/Android运行时(889): at dalvik.system.NativeStart.main(Native Method)

我认为问题是,我的MainActivity没有从ActivityGroup扩展和/或我没有使用LocalActivityManager。问题是,两者都已弃用。我必须更改什么才能在不使用已弃用的方法和类的情况下使其工作?

很抱歉这个可能很简单的问题,但我没有通过谷歌找到任何东西,我是安卓编程:)新手。

正如你提到的,你应该从 活动组 扩展,但如果你不想要一个不推荐使用的类,所以你可以 使用FragmentsFragmentManager

片段

试试这个

 tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(R.id.tab2))); 

像这样更改代码

   TabHost.TabSpec spec;  // Resusable TabSpec for each tab
Intent intent;  // Reusable Intent for each tab
// Create an Intent to launch an Activity for the tab (to be reused)
intent = new Intent().setClass(this, ArtistsActivity.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("artists").setIndicator("Artists",
                  res.getDrawable(R.drawable.ic_tab_artists)).setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, AlbumsActivity.class);
spec = tabHost.newTabSpec("albums").setIndicator("Albums",
                  res.getDrawable(R.drawable.ic_tab_albums)).setContent(intent);
tabHost.addTab(spec);

请参阅尼斯Android教程示例hello-tabwidget

做类似的事情,

TabHost tabHost = getTabHost(); 
    Intent intentHome = new Intent().setClass(MainScreen.this, Home.class);
    TabSpec tabSpecHome = tabHost.newTabSpec("Home").setIndicator("Home").setContent(intentHome);
    tabHost.addTab(tabSpecHome);        
    tabHost.setCurrentTab(0);

希望这有帮助.. :)

tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(new Intent(this, SettingsActivity.class)));中删除"this"

并替换为 getApplicationContext();

喜欢这个

tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(new Intent(getApplicationContext(), SettingsActivity.class)));

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