Display a Message that overlays the ActionBar in Android Activity. Set time in seconds for the message to slide away.

ActionBarAlert.java

package com.sketchpunk;

import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.app.Activity;
import android.graphics.Color;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.Window;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.FrameLayout;
import android.widget.TextView;

public class ActionBarAlert{
	private FrameLayout mLayout;
	private TextView mTextView;
	private AnimatorSet mAnimSlideDown;
	private AnimatorSet mAnimSlideUp;
	private boolean mIsVisible = false;
	private Runnable mHideThread;

	public ActionBarAlert(Activity act){
		//...........................................
		Window window = act.getWindow(); //Container is a frame layout
		View v = window.getDecorView(); //Get Root View

		int resId = act.getResources().getIdentifier("action_bar_container","id","android");
		FrameLayout mActionBarRoot = (FrameLayout)v.findViewById(resId);

		//...........................................
		//Get the size of of tha action bar in another way since getHeight is zero until after Activity.onResume is called
		TypedValue tv = new TypedValue();
		int height = 56;
		try{
			if(act.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true)){
				height = TypedValue.complexToDimensionPixelSize(tv.data, act.getResources().getDisplayMetrics());
			}//if
		}catch(Exception e){
			System.out.println("Error trying to get Action Bar Height " + e.getMessage());
		}//try

		//...........................................
		//Create a new layout that will live over the actionbar.
		mLayout = new FrameLayout(act);
		mLayout.setBackgroundColor(Color.parseColor("#FFFFFF"));
		mLayout.setVisibility(View.INVISIBLE);

		//Stop events from bubbling down to action bar.
		mLayout.setOnTouchListener(new View.OnTouchListener(){public boolean onTouch(View v,MotionEvent event){return true;}});

		//set the size of the message layout to the same size as the action bar.
		FrameLayout.LayoutParams mLayoutParams = new FrameLayout.LayoutParams(FrameLayout.LayoutParams.MATCH_PARENT,height,Gravity.LEFT | Gravity.TOP);

		//...........................................
		//Create TextView that will display the alert message
		mTextView = new TextView(act);
		mTextView.setText("Hello");
		mTextView.setTextColor(Color.parseColor("#000000"));
		mTextView.setLayoutParams(new FrameLayout.LayoutParams(FrameLayout.LayoutParams.WRAP_CONTENT, FrameLayout.LayoutParams.WRAP_CONTENT, Gravity.CENTER));
		mLayout.addView(mTextView);

		//...........................................
		mAnimSlideDown = new AnimatorSet();
		ObjectAnimator alphaAnimD = ObjectAnimator.ofFloat(mLayout, "alpha", 0f, 1f);
		ObjectAnimator transAnimD = ObjectAnimator.ofFloat(mLayout,"translationY",-height,0f);
		transAnimD.setInterpolator(new AccelerateDecelerateInterpolator());
		mAnimSlideDown.playTogether(transAnimD, alphaAnimD);
		mAnimSlideDown.setDuration(250);

		mAnimSlideUp = new AnimatorSet();
		ObjectAnimator alphaAnimU = ObjectAnimator.ofFloat(mLayout, "alpha", 1f, 0f);
		ObjectAnimator transAnimU = ObjectAnimator.ofFloat(mLayout,"translationY",0f,-height);
		alphaAnimU.setInterpolator(new AccelerateDecelerateInterpolator());
		mAnimSlideUp.playTogether(transAnimU, alphaAnimU);
		mAnimSlideUp.setDuration(250);

		//...........................................
		//Reusable thread to hide the message after n amount of seconds.
		mHideThread = new Runnable(){ @Override public void run(){ hide(); }};

		//...........................................
		//Inject new views over the action bar.
		mActionBarRoot.addView(mLayout,mLayoutParams);
	}//func

	public void show(String msg){ show(msg,0); }
	public void show(String msg,int secToHide){
		mTextView.setText(msg);

		if(!mIsVisible){
			mLayout.setVisibility(View.VISIBLE);
			mAnimSlideDown.start();
			mIsVisible = true;
		}//if

		if(secToHide > 0) mLayout.postDelayed(mHideThread,secToHide * 1000);
	}//func

	public void hide(){
		if(!mIsVisible) return;

		mAnimSlideUp.start();
		mIsVisible = false;
	}//func

	public boolean isVisible(){ return mIsVisible; }
}//cls

gistfile1.txt

protected void onCreate(Bundle savedInstanceState){
	mBarAlert = new ActionBarAlert(this);
}//if

Useage:
mBarAlert.show("Hello World",3);