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Because when you start Tab, you don’t call the method onTabChanged().
public class MainActivity extends TabActivity { private TabHost mTabHost;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Resources res = getResources();
mTabHost = getTabHost();
TabHost.TabSpec spec;
Intent intent;
//Home
intent = new Intent(this, HelloActivity.class);
spec = mTabHost.newTabSpec("novaos")
.setIndicator("tab1", res.getDrawable(R.drawable.ic_launcher))
.setContent(intent);
mTabHost.addTab(spec);
intent = new Intent(this, HelloActivity.class);
spec = mTabHost.newTabSpec("novaos")
.setIndicator("tab2", res.getDrawable(R.drawable.ic_launcher))
.setContent(intent);
mTabHost.addTab(spec);
intent = new Intent(this, HelloActivity.class);
spec = mTabHost.newTabSpec("novaos")
.setIndicator("tab3", res.getDrawable(R.drawable.ic_launcher))
.setContent(intent);
mTabHost.addTab(spec);
for(int i=0;i<mTabHost.getTabWidget().getChildCount();i++)
{
mTabHost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#333333"));
}
mTabHost.getTabWidget().setCurrentTab(0);
// mTabHost.getTabWidget().getChildAt(1).setBackgroundColor(Color.parseColor("#505050"));
}
private static final int ANIMATION_TIME = 240;
private TabHost tabHost;
private View previousView;
private View currentView;
private int currentTab;
/**
* Constructor that takes the TabHost as a parameter and sets previousView to the currentView at instantiation
*
* @param tabHost
* @return
*/
public void AnimatedTabHostListener(TabHost tabHost)
{
this.tabHost = tabHost;
this.previousView = tabHost.getCurrentView();
}
/**
* When tabs change we fetch the current view that we are animating to and animate it and the previous view in the
* appropriate directions.
*/
public void onTabChanged(String tabId)
{
Toast.makeText(getBaseContext(), "Stop!", Toast.LENGTH_LONG).show();
currentView = tabHost.getCurrentView();
if (tabHost.getCurrentTab() > currentTab)
{
previousView.setAnimation(outToLeftAnimation());
currentView.setAnimation(inFromRightAnimation());
}
else
{
previousView.setAnimation(outToRightAnimation());
currentView.setAnimation(inFromLeftAnimation());
}
previousView = currentView;
currentTab = tabHost.getCurrentTab();
}
/**
* Custom animation that animates in from right
*
* @return Animation the Animation object
*/
private Animation inFromRightAnimation()
{
Animation inFromRight = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 1.0f, Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
return setProperties(inFromRight);
}
/**
* Custom animation that animates out to the right
*
* @return Animation the Animation object
*/
private Animation outToRightAnimation()
{
Animation outToRight = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
return setProperties(outToRight);
}
/**
* Custom animation that animates in from left
*
* @return Animation the Animation object
*/
private Animation inFromLeftAnimation()
{
Animation inFromLeft = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, -1.0f, Animation.RELATIVE_TO_PARENT, 0.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
return setProperties(inFromLeft);
}
/**
* Custom animation that animates out to the left
*
* @return Animation the Animation object
*/
private Animation outToLeftAnimation()
{
Animation outtoLeft = new TranslateAnimation(Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, -1.0f,
Animation.RELATIVE_TO_PARENT, 0.0f, Animation.RELATIVE_TO_PARENT, 0.0f);
return setProperties(outtoLeft);
}
/**
* Helper method that sets some common properties
* @param animation the animation to give common properties
* @return the animation with common properties
*/
private Animation setProperties(Animation animation)
{
animation.setDuration(ANIMATION_TIME);
animation.setInterpolator(new AccelerateInterpolator());
return animation;
}}
So no animation happens. What would be the problem?