Mark, thanks that worked!! For thread recycling, I will put the final
classes at the end.
Notes:
- You need to shift mTabContent down by setting margins. Used a
hard-coded 65. Could not find a Static for this value.
- Found a bug when I implemented my removeTab() method. You
cannot just remove children from mTabWidget & mTabContent, because
mTabSpecs needs to also to be changed. It is not accessable.
Therefore you must:
- Go get all the views & titles that are not the one you are
trying to get rid of.
- Call clearAllTabs()
- Add the remaining views back.
The bug is, mTabWidget's mSelectedTab member does not get reset to 0.
If the first tab is not selected when the clear happens, then when you
try to add a tab, eventually mTabWidget's setCurrentTab() gets called,
causing a Null Pointer Exception on line 164.
//
==========================================================================
import android.content.Context;
import android.view.Gravity;
import android.widget.TabHost;
import android.widget.TabHost.TabContentFactory;
import android.widget.TabHost.TabSpec;
import android.widget.TabWidget;
class DynamicTabHost extends TabHost{
public DynamicTabHost(Context context){
super(context);
TabWidget tabs = new TabWidget(super.getContext() );
tabs.setId(android.R.id.tabs);
addView(tabs, new LayoutParams
(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT,Gravity.TOP));
FrameLayout frame = new FrameLayout(super.getContext() );
frame.setId(android.R.id.tabcontent);
FrameLayout.LayoutParams params = new LayoutParams
(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT,Gravity.BOTTOM);
params.setMargins(0, 65, 0, 0);
addView(frame, params);
super.setup();
}
public void addTab(View view, String tabTitle){
TabSpec tabSpec = super.newTabSpec(tabTitle);
tabSpec.setContent(new PreExistingViewFactory(view));
tabSpec.setIndicator(tabTitle);
super.addTab(tabSpec);
}
public void removeTab(View view){
// determine where tab is to get rid of
ViewGroup content = getTabContentView();
int nukedIdx = content.indexOfChild(view);
if (nukedIdx == -1) return;
// prepare to get the remaining tab instances prior to
clearAllTabs()
int nTabs = getTabCount();
View[] remainingViews = null;
String[] remainingTitles = null;
if (nTabs > 1){
remainingViews = new View [nTabs - 1];
remainingTitles = new String[nTabs - 1];
for (int i = 0, c = 0; i < nTabs; i++){
if (i != nukedIdx){
remainingViews [c ] = content.getChildAt(i);
remainingTitles[c++] = getTabTitle(i);
}
}
}
// only way to get state correct
clearAllTabs();
// add back any remaining
for(int i = 0; i < nTabs - 1; i++){
addTab(remainingViews[i], remainingTitles[i]);
}
}
private String getTabTitle(int index){
RelativeLayout tab = (RelativeLayout) super.getTabWidget
().getChildAt(index);
TextView text = (TextView) tab.getChildAt(1);
return text.getText().toString();
}
// needed to fix Bug in clearAllTabs; TabWidget corrupt
@Override
public void clearAllTabs(){
// TabWidget corrupt when first not current
super.setCurrentTab(0);
super.clearAllTabs();
}
}
//--------------------------------------------------------------------------
class PreExistingViewFactory implements TabContentFactory{
private final View preExisting;
protected PreExistingViewFactory(View view){
preExisting = view;
}
public View createTabContent(String tag) {
return preExisting;
}
}
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