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   源码介绍

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时光轴 向下拉比较炫

package com.flavienlaurent.notboringactionbar;

import java.util.ArrayList;

import android.app.ActionBar;
import android.app.Activity;
import android.content.Context;
import android.graphics.RectF;
import android.os.Bundle;
import android.text.Spannable;
import android.text.SpannableString;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

public class NoBoringActionBarActivity extends Activity {

    private static final String TAG = "NoBoringActionBarActivity";
    private int mActionBarTitleColor;
    private int mActionBarHeight;
    private int mHeaderHeight;
    private int mMinHeaderTranslation;
    private ListView mListView;
    private KenBurnsView mHeaderPicture;
    private ImageView mHeaderLogo;
    private View mHeader;
    private View mPlaceHolderView;
    private AccelerateDecelerateInterpolator mSmoothInterpolator;

    private RectF mRect1 = new RectF();
    private RectF mRect2 = new RectF();

    private AlphaForegroundColorSpan mAlphaForegroundColorSpan;
    private SpannableString mSpannableString;

    private TypedValue mTypedValue = new TypedValue();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mSmoothInterpolator = new AccelerateDecelerateInterpolator();
        mHeaderHeight = getResources().getDimensionPixelSize(R.dimen.header_height);
        mMinHeaderTranslation = -mHeaderHeight   getActionBarHeight();
//布局加载
        setContentView(R.layout.activity_noboringactionbar);

        mListView = (ListView) findViewById(R.id.listview);
        //加载控件
        mHeader = findViewById(R.id.header);
        mHeaderPicture = (KenBurnsView) findViewById(R.id.header_picture);
        mHeaderPicture.setResourceIds(R.drawable.picture0, R.drawable.picture1);
        mHeaderLogo = (ImageView) findViewById(R.id.header_logo);

        mActionBarTitleColor = getResources().getColor(R.color.actionbar_title_color);

        mSpannableString = new SpannableString(getString(R.string.noboringactionbar_title));
        mAlphaForegroundColorSpan = new AlphaForegroundColorSpan(mActionBarTitleColor);

        setupActionBar();
        setupListView();
    }
//加载动画
    private void setupListView() {
        ArrayList<String> FAKES = new ArrayList<String>();
        for (int i = 0; i < 1000; i  ) {
            FAKES.add("entry "   i);
        }
        mPlaceHolderView = getLayoutInflater().inflate(R.layout.view_header_placeholder, mListView, false);
        mListView.addHeaderView(mPlaceHolderView);
        myadapter itenadapter=new myadapter(this, 10);
        mListView.setAdapter(itenadapter);
        mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
            @Override
            public void onScrollStateChanged(AbsListView view, int scrollState) {
            }

            @Override
            public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                int scrollY = getScrollY();
                //sticky actionbar
                mHeader.setTranslationY(Math.max(-scrollY, mMinHeaderTranslation));
                //header_logo --> actionbar icon
                float ratio = clamp(mHeader.getTranslationY() / mMinHeaderTranslation, 0.0f, 1.0f);
                interpolate(mHeaderLogo, getActionBarIconView(), mSmoothInterpolator.getInterpolation(ratio));
                //actionbar title alpha
                //getActionBarTitleView().setAlpha(clamp(5.0F * ratio - 4.0F, 0.0F, 1.0F));
                //---------------------------------
                //better way thanks to @cyrilmottier
                setTitleAlpha(clamp(5.0F * ratio - 4.0F, 0.0F, 1.0F));
            }
        });
    }

    public class myadapter extends BaseAdapter {
    	private Context mContext;
    	private int count;
    	public myadapter(Context context,int count) {
    		this.mContext = context;
    		this.count=count;
    	}
		@Override
		public int getCount() {
			// TODO Auto-generated method stub
			return count;
		}

		@Override
		public Object getItem(int position) {
			// TODO Auto-generated method stub
			return null;
		}

		@Override
		public long getItemId(int position) {
			// TODO Auto-generated method stub
			return 0;
		}

		@Override
		public View getView(int position, View convertView, ViewGroup parent) {
			// TODO Auto-generated method stub
			ViewHolder viewHolder = null;
			if (convertView == null) {
				convertView = LayoutInflater.from(mContext).inflate(
						R.layout.listitem, null);
				viewHolder = new ViewHolder();
				viewHolder.mImageView= (ImageView)convertView.findViewById(R.id.imageView3);
			
				convertView.setTag(viewHolder);
			} else {
				viewHolder = (ViewHolder) convertView.getTag();
			}
			
if (position%2==0) {
	viewHolder.mImageView.setImageDrawable(getResources().getDrawable(R.drawable.picture1));
}
			return convertView;

		}
		 class ViewHolder {
			TextView mtitle;
			ImageView mImageView;
		}
    }
    private void setTitleAlpha(float alpha) {
        mAlphaForegroundColorSpan.setAlpha(alpha);
        mSpannableString.setSpan(mAlphaForegroundColorSpan, 0, mSpannableString.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
        getActionBar().setTitle(mSpannableString);
    }

    public static float clamp(float value, float max, float min) {
        return Math.max(Math.min(value, min), max);
    }

    private void interpolate(View view1, View view2, float interpolation) {
        getOnScreenRect(mRect1, view1);
        getOnScreenRect(mRect2, view2);

        float scaleX = 1.0F   interpolation * (mRect2.width() / mRect1.width() - 1.0F);
        float scaleY = 1.0F   interpolation * (mRect2.height() / mRect1.height() - 1.0F);
        float translationX = 0.5F * (interpolation * (mRect2.left   mRect2.right - mRect1.left - mRect1.right));
        float translationY = 0.5F * (interpolation * (mRect2.top   mRect2.bottom - mRect1.top - mRect1.bottom));

        view1.setTranslationX(translationX);
        view1.setTranslationY(translationY - mHeader.getTranslationY());
        view1.setScaleX(scaleX);
        view1.setScaleY(scaleY);
    }

    private RectF getOnScreenRect(RectF rect, View view) {
        rect.set(view.getLeft(), view.getTop(), view.getRight(), view.getBottom());
        return rect;
    }

    public int getScrollY() {
        View c = mListView.getChildAt(0);
        if (c == null) {
            return 0;
        }

        int firstVisiblePosition = mListView.getFirstVisiblePosition();
        int top = c.getTop();

        int headerHeight = 0;
        if (firstVisiblePosition >= 1) {
            headerHeight = mPlaceHolderView.getHeight();
        }

        return -top   firstVisiblePosition * c.getHeight()   headerHeight;
    }

    private void setupActionBar() {
        ActionBar actionBar = getActionBar();
        actionBar.setIcon(R.drawable.ic_transparent);
        //getActionBarTitleView().setAlpha(0f);
    }

    private ImageView getActionBarIconView() {
        return (ImageView) findViewById(android.R.id.home);
    }

    /*private TextView getActionBarTitleView() {
        int id = Resources.getSystem().getIdentifier("action_bar_title", "id", "android");
        return (TextView) findViewById(id);
    }*/

    public int getActionBarHeight() {
        if (mActionBarHeight != 0) {
            return mActionBarHeight;
        }
        getTheme().resolveAttribute(android.R.attr.actionBarSize, mTypedValue, true);
        mActionBarHeight = TypedValue.complexToDimensionPixelSize(mTypedValue.data, getResources().getDisplayMetrics());
        return mActionBarHeight;
    }
    @Override 
    public boolean onOptionsItemSelected(MenuItem item) 
    { 
        switch (item.getItemId()) 
        { 
        case android.R.id.home: 
        finish();
            return true; 
        default: 
            return super.onOptionsItemSelected(item); 
        } 
    } 

 
}