Develop Reference

Open a TabActivity with "simple" Activity

I have a problem when I try to open a TabActivity with an intent from an Activity.
The code of my activity (ConnexionActivity), which is NOT an activity from a tab :
buttonConnexion.setOnClickListener(new OnClickListener(){
public void onClick(View v) {
Intent intent = new Intent(ConnexionActivity.this, NeurokiffMobileActivity.class);
startActivity(intent);
}
});
and the TabActivity (NeurokiffMobileActivity) :
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
this.getIntent();
/* ******** Gestion Onglets ******** */
res = getResources(); // Resource object to get Drawables
tabHost = (TabHost) findViewById(android.R.id.tabhost); // The activity TabHost
/* *** Onglet "Evènements" *** */
/* Intent responsable de lancer l'activité depuis l'onglet */
intent = new Intent().setClass(this, EvenementActivity.class);
bundleEnvoye.putString("id_user", idUser);
intent.putExtras(bundleEnvoye);
/* Crée un TabSpec et l'ajoute au TabHost */
spec = tabHost.newTabSpec("evenement").setIndicator("Evenements",
res.getDrawable(R.drawable.ic_tab_evenement))
.setContent(intent);
tabHost.addTab(spec);
/* *** Onglet "Favoris" *** */
intent = new Intent().setClass(this, FavorisActivity.class);
bundleEnvoye.putString("id_user", idUser);
intent.putExtras(bundleEnvoye);
spec = tabHost.newTabSpec("favoris").setIndicator("Favoris",
res.getDrawable(R.drawable.ic_tab_favoris))
.setContent(intent);
tabHost.addTab(spec);
/* *** Onglet "Kiffs" *** */
intent = new Intent().setClass(this, KiffsActivity.class);
bundleEnvoye.putString("id_user", idUser);
intent.putExtras(bundleEnvoye);
spec = tabHost.newTabSpec("kiffs").setIndicator("Kiffs",
res.getDrawable(R.drawable.ic_tab_kiffs))
.setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(0);
}
and the .xml of this TabActivity :
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
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">
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="1"
android:padding="5dp" />
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_weight="0"/>
</LinearLayout>
</TabHost>
The error is a NullPointerException on the onCreate method of NeurokiffMobileActivity, and the application close.
When I put another "simple" Activity instead of NeurokiffMobileActivity in the intent, it works.
Can someone help me, please ? It seems to be a problem due to TabActivity, but I don't know which...
Thanks in advance ! ;)

Here is the sample for you
showtab.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
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">
<TabWidget
android:id="#android:id/tabs"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
</TabWidget>
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:id="#android:id/tabcontent" >
</FrameLayout>
</LinearLayout>
</TabHost>
Below is the code of AfterLoginTabActivity(a tabactivity to be called)
public class AfterLoginTabActivity extends TabActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.afterloginview);
#SuppressWarnings("deprecation")
TabHost tabHost =getTabHost();
Intent i = new Intent(AfterLoginTabActivity.this,ProfileClass.class);
TabSpec profileSpec = tabHost.newTabSpec("profile").setIndicator("Profile").setContent(i);
Intent j = new Intent(AfterLoginTabActivity.this,GroupClass.class);
TabSpec groupSpec = tabHost.newTabSpec("group").setIndicator("group").setContent(j);
tabHost.addTab(profileSpec);
tabHost.addTab(groupSpec);
tabHost.setCurrentTab(1);
}
}
Code i used inside my button.setOnClickListener
if(msg == "success")
{
System.out.println("Inside button");
try {
Intent intent = new Intent(MainActivity.this,AfterLoginTabActivity.class);
startActivity(intent);
finish();
} catch (Exception e) {
// TODO: handle exception
System.out.print("tHIS IS EXCCEPTION" + e);
}
}

Tab Activity not showing

I am trying to get an Activity to show in a tab but just can't get it to work.
I have checked that the activity shows when on its own but as soon as I try to put it in a tab I get an empty tab.
This is the tab screen and its XML layout file:
public class TestTabs extends TabActivity{
private TabHost tabHost; // The tabhost for all the tabs
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.tabbed_screen);
tabHost = getTabHost();
initTabs();
}
protected void addTab(String tabName, Intent tabIntent){
TabSpec tabSpec = tabHost.newTabSpec(tabName);
tabSpec.setIndicator(tabName);
tabSpec.setContent(tabIntent);
tabHost.addTab(tabSpec);
}
protected void initTabs() {
addTab("1",new Intent(this,TestActivity.class));
}
}
Layout:
<?xml version="1.0" encoding="utf-8"?>
<TabHost android:layout_width="fill_parent"
android:layout_height="fill_parent" xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost">
<LinearLayout android:id="#+id/LinearLayout01"
android:orientation="vertical" android:layout_height="fill_parent"
android:layout_width="fill_parent">
<TabWidget android:id="#android:id/tabs" android:layout_height="fill_parent" android:layout_width="fill_parent"></TabWidget>
<FrameLayout android:id="#android:id/tabcontent"
android:layout_height="fill_parent" android:layout_width="fill_parent">
</FrameLayout>
</LinearLayout>
</TabHost>
This is the "child" activity:
public class TestActivity extends Activity {
#Override
public void onCreate(Bundle savedInstanceState) {
// The super.onCreate() call will set the general frame also for this Screen:
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
}
Layout:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:ellipsize="end"
android:maxLines="1"
android:singleLine="true"
android:text="Hello World"
android:textSize="12sp"
android:textStyle="bold" />
As I said, the child activity shows ok when alone but when I put it in the tab I get the tab without any contents.
I am probably missing something obvious but this is the first time I have done anything with tabs in Android.

You should change name of method "addTab" because its default method of TabActivity that might be causing this problem.secondly,your code should be like:
public class TestTabs extends TabActivity{
private TabHost tabHost; // The tabhost for all the tabs
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.tabbed_screen);
tabHost = getTabHost();
TabSpec tabSpec;
Intent intent = new Intent().setClass(this, tab1_activity.class);
tabSpec = tabHost.newTabSpec("Tab-1").setIndicator("Tab-1",drawable1_obj).setContent(intent);
tabHost.addTab(spec);
intent = new Intent().setClass(this, tab2_activity.class);
tabSpec = tabHost.newTabSpec("Tab-2").setIndicator("Tab-2",drawable2_obj).setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(1);
}
}

Listening click TabWidget

My tabhost tools.java:
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.tabtools);
Resources res = getResources();
TabHost tabHost = getTabHost();
TabHost.TabSpec spec;
Intent intent;
// TabDados
intent = new Intent().setClass(this, ToolDadosTubuCirc.class);
spec = tabHost.newTabSpec("dados")
.setIndicator("Dados", res.getDrawable(R.drawable.icondados))
.setContent(intent);
tabHost.addTab(spec);
// TabLegenda
intent = new Intent().setClass(this, ToolLegendaTubuCirc.class);
spec = tabHost
.newTabSpec("legenda")
.setIndicator("Legenda",
res.getDrawable(R.drawable.iconlegenda))
.setContent(intent);
tabHost.addTab(spec);
// TabCalcular
intent = new Intent().setClass(this, ToolCalcularTubuCirc.class);
spec = tabHost
.newTabSpec("calcular")
.setIndicator("Calcular",
res.getDrawable(R.drawable.iconcalcular))
.setContent(intent);
tabHost.addTab(spec);
// TabCorrente
tabHost.setCurrentTab(0);
}}
Each intent calls an activity.
and within each "file. java" commands have to perform the calculations.
Within "dados.java" is where I get the information of the User.
When they click on the tab "calcular" must verify that all data has been completed.
I guess I need a "onclicklistener" for each tab, like a button, right??
How? how to create an event to run code when a tab"Dados" tab"Legenda" tab"calcular" is clicked?
Attention: I need to check which tab was clicked from the file "ToolDadosCircular.java."
Edit:
tabtools.xml code:
<TabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="#+layout/rowLog"
android:layout_below="#+layout/rowLine" >
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:padding="5dp" >
<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"
android:padding="5dp" />
</LinearLayout>
</TabHost>

Try
tabHost.getChildAt(yourtab).setOnClickListener(new View.onClickListener()
{
#Override public void onClick(View view){
//your code
}
}
Edit: I'm guessing your class is like this
public class ToolDadosTubuCirc extends Activity{
#Override public void onCreate(Bundle bundle){
//code...
TabHost tabHost = (TabHost) getParent().findViewById(yourTabHostId);
//do what you want with tabHost
//code...
}
}

AsyncTasks and tabs

I am trying to work with AsyncTasks in Android 2.1 but get errors on my code.
I want to display to the user logo and after that to display my tabs but get errors on my AsyncTask.If you can see my code and tell me where my errors are.
the error is
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.News/startPakage.tabs}: java.lang.RuntimeException: Your content must have a TabHost whose id attribute is 'android.R.id.tabhost'
where my code is:
public class tabs extends TabActivity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.logoscreen);
new GetDataTask(this).execute();
private class GetDataTask extends AsyncTask<Void, Void, Integer> {
Context context;
GetDataTask(Context context){this.context=context;}
protected Integer doInBackground(Void... params) {
int waited = 0;
while (waited < 5000) {
try {
this.wait(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
waited += 100;
}
return 1;
}
protected void onPostExecute(Integer result) {
tabs.this.setContentView(R.layout.tabs);
//setContentView(R.layout.tabs);
TabHost tabHost= (TabHost)tabs.this.findViewById( android.R.id.tabhost );
//
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(context,start.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("Heb news").setIndicator("Heb news").setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(context, rusNewsP.ListRusNews.class);
spec = tabHost.newTabSpec("Rus News").setIndicator("Rus News").setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(0);
}
}
And my xml is:
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
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="wrap_content" />
<FrameLayout
android:id="#android:id/tabcontent"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="5dp" />
</LinearLayout>
thanks a lot!

The problem is that you're using a TabActivity but the first time you set the content view you do NOT have a tabhost (in the R.layout.logoscreen file). You can add the tabhost to your logo layout (it won't hurt) and it should work. Alternatively, you can split the code into two activities and just kick off a new activity after the AsyncTask is done.

You can try this:
Give id as : android:id="#+id/tabhost"
and in your code use:
TabHost tabHost= (TabHost)tabs.this.findViewById( R.id.tabhost );
Do this for all the declarations in your xml file.

load two .swf flies in a Tab Layout

I use a Tab Layout display two .swf files and a imageView in three tabs. However, when I wanted to change to imageView from a swf tab. The swf still exits.
//TabActivity
public class TabSwfActivity extends TabActivity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
Resources res = getResources(); // Resource object to get Drawables
TabHost tabHost = getTabHost(); // The activity TabHost
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, OperatorActivity.class);
// Initialize a TabSpec for each tab and add it to the TabHost
spec = tabHost.newTabSpec("artists").setIndicator("artists")
.setContent(intent);
tabHost.addTab(spec);
// Do the same for the other tabs
intent = new Intent().setClass(this, LearningActivity.class);
spec = tabHost.newTabSpec("albums").setIndicator("albums")
.setContent(intent);
tabHost.addTab(spec);
intent = new Intent().setClass(this, QuestionActivity.class);
spec = tabHost.newTabSpec("songs").setIndicator("songs")
.setContent(intent);
tabHost.addTab(spec);
tabHost.setCurrentTab(2);
}
}
//main.xml
<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
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">
<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>
//swf tab learningActivity.java
public class LearningActivity extends Activity {
private WebView mWebView;
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.learninglayout);
String url ="file:///android_asset/sample/simple.swf";
mWebView=(WebView) findViewById(R.id.webView1);
mWebView.getSettings().setPluginsEnabled(true);
mWebView.loadUrl(url);
}
}
// learning.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"
>
<WebView android:id="#+id/webView1"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
</WebView>
</LinearLayout>
//picture tab
public class QuestionActivity extends Activity {
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.questionlayout);
}
}