Reputation: 2398
Android - TabHost / TabWidget
I'm new to android and try to port a iOS app. Unfortunately I have some trouble to get my base setup working.
I'm trying to implement a similiar navigation to this tutorial: tutorial
It is more or less a simple TabHost containing several tabs but instead of using
tabHost.addTab(tabHost.newTabSpec("settings").setIndicator("settings").setContent(R.id.tab1));
as in the tutorial and what is working I'd like to Init my tab with a class like this:
tabHost.addTab(tabHost.newTabSpec("settings").setIndicator("settings").setContent(new Intent(this, SettingsActivity.class)));
Unfortunately the app crashes when I click on the 'settings-tab'.
This is my code so far:
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>
SettingsActivity:
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);
}
}
Error-message from LogCat:
10-15 03:52:22.711: W/dalvikvm(889): threadid=1: thread exiting with uncaught exception (group=0x41465700) 10-15 03:52:22.851: E/AndroidRuntime(889): FATAL EXCEPTION: main 10-15 03:52:22.851: E/AndroidRuntime(889): java.lang.IllegalStateException: Did you forget to call 'public void setup(LocalActivityManager activityGroup)'? 10-15 03:52:22.851: E/AndroidRuntime(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/AndroidRuntime(889): at android.widget.TabHost$2.onTabSelectionChanged(TabHost.java:154) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.widget.TabWidget$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$PerformClick.run(View.java:17721) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.os.Handler.handleCallback(Handler.java:730) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.os.Handler.dispatchMessage(Handler.java:92) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.os.Looper.loop(Looper.java:137) 10-15 03:52:22.851: E/AndroidRuntime(889): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-15 03:52:22.851: E/AndroidRuntime(889): at java.lang.reflect.Method.invokeNative(Native Method) 10-15 03:52:22.851: E/AndroidRuntime(889): at java.lang.reflect.Method.invoke(Method.java:525) 10-15 03:52:22.851: E/AndroidRuntime(889): at com.android.internal.os.ZygoteInit$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/AndroidRuntime(889): at dalvik.system.NativeStart.main(Native Method)
I think the problem is, that my MainActivity is not extended from ActivityGroup and/or that I'm not using the LocalActivityManager. The problem is, both are deprecated. What do I have to change to get it work without using deprecated methods and classes?
Sorry for this perhaps simple question but I found nothing via google and I'm new to android programming :).
Upvotes: 1
Views: 5270
Answers (4)
Reputation: 553
Remove "this" from tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(new Intent(this, SettingsActivity.class)));
and replace with getApplicationContext();
like this
tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(new Intent(getApplicationContext(), SettingsActivity.class)));
Upvotes: 0
Reputation: 1739
Do something like,
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);
Hope this helps.. :)
Upvotes: 0
Reputation: 8645
Try this
tabHost.addTab(tabHost.newTabSpec("Einstellungen").setIndicator("Einstellungen").setContent(R.id.tab2)));
Change your code like this
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);
See Nice Android tutorial example hello-tabwidget
Upvotes: 0
