[Android UI]ActionBar随ScorllView上下拖动而透明度渐变效果（续1）
浏览数：72 /
时间：2015年06月11日
根据上一篇ActionBar随ScorllView上下拖动而透明度渐变效果的基本描述，我们自定义的actionbar滚动透明的效果使用起来可能有点繁琐。这次想要在上次的代码内容上（可自动切换、无限滑动的图片广告展示栏的实现分享(续1)），博主太懒了，哈哈，实现这样的效果。
这次的demo很简单，老样子，你可以自己下载demo稍微看看，结构如下：
主界面代码：
package org.jan.adviewpaper.demo;
import android.app.ActionBar;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.Toast;
import com.achep.header2actionbar.FadingActionBarHelper;
/**
* demo 主界面
* @author jan
*/
public class MainActivity extends Activity implements OnClickListener {
private static final String TAG = "MainActivity";
private ActionBar mActionBar;
//这边的是ActionBar的辅助类，设置透明度在里面的干活！
private FadingActionBarHelper mFadingActionBarHelper;
private Button mSearchButton;
//....
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mActionBar = getActionBar();
// 使用自定义的布局的ActionBar
mActionBar.setDisplayOptions(ActionBar.DISPLAY_SHOW_CUSTOM);
mActionBar.setCustomView(R.layout.my_actionbar);
mSearchButton = (Button) mActionBar.getCustomView().findViewById(
R.id.search_button);
// 给搜索按钮添加点击事件
mSearchButton.setOnClickListener(this);
// 注意！定义Actionbar的背景色 ，这句不能忘记！
mActionBar.getCustomView().setBackground(
getResources().getDrawable(R.drawable.actionbar_bg));
mFadingActionBarHelper = new FadingActionBarHelper(getActionBar(),
getResources().getDrawable(R.drawable.actionbar_bg));
if (savedInstanceState == null) {
getFragmentManager().beginTransaction()
.add(R.id.container_view, new MyViewFragment()).commit();
}
}
public FadingActionBarHelper getFadingActionBarHelper() {
return mFadingActionBarHelper;
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.search_button:
Log.d(TAG, "你点击了搜索按钮！");
Toast.makeText(this, "you clicked search", 1000).show();
break;
}
}
}
必须继承这个抽象类来实现效果HeaderFragment.java:
public abstract class HeaderFragment extends Fragment {
private static final String TAG = "HeaderFragment";
public static final int HEADER_BACKGROUND_SCROLL_NORMAL = 0;
public static final int HEADER_BACKGROUND_SCROLL_PARALLAX = 1;
public static final int HEADER_BACKGROUND_SCROLL_STATIC = 2;
//TODO header’s height 你可以改变他
public static int headerHeight=350;
private FrameLayout mFrameLayout;
private View mContentOverlay;
// header
private View mHeader;
private View mHeaderHeader;
private View mHeaderBackground;
private int mHeaderHeight;
private int mHeaderScroll;
private int mHeaderBackgroundScrollMode = HEADER_BACKGROUND_SCROLL_NORMAL;
private Space mFakeHeader;
private boolean isListViewEmpty;
// listeners
private AbsListView.OnScrollListener mOnScrollListener;
private OnHeaderScrollChangedListener mOnHeaderScrollChangedListener;
public interface OnHeaderScrollChangedListener {
public void onHeaderScrollChanged(float progress, int height, int scroll);
}
public void setOnHeaderScrollChangedListener(OnHeaderScrollChangedListener listener) {
mOnHeaderScrollChangedListener = listener;
}
public void setHeaderBackgroundScrollMode(int scrollMode) {
mHeaderBackgroundScrollMode = scrollMode;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final Activity activity = getActivity();
assert activity != null;
mFrameLayout = new FrameLayout(activity);
mHeader = onCreateHeaderView(inflater, mFrameLayout);
mHeaderHeader = mHeader.findViewById(android.R.id.title);
// mHeaderBackground = mHeader.findViewById(android.R.id.background);
assert mHeader.getLayoutParams() != null;
// mHeaderHeight = mHeader.getLayoutParams().height;
View content = onCreateContentView(inflater, mFrameLayout);
mHeaderHeight = headerHeight;
mFakeHeader = new Space(activity);
mFakeHeader.setLayoutParams(
new ListView.LayoutParams(0, mHeaderHeight));
mFakeHeader.setLayoutParams(
new ListView.LayoutParams(0, 0));
mHeaderBackground = content.findViewById(android.R.id.background);
if (content instanceof ListView) {
isListViewEmpty = true;
final ListView listView = (ListView) content;
listView.addHeaderView(mFakeHeader);
listView.setOnScrollListener(new AbsListView.OnScrollListener() {
@Override
public void onScrollStateChanged(AbsListView absListView, int scrollState) {
if (mOnScrollListener != null) {
mOnScrollListener.onScrollStateChanged(absListView, scrollState);
}
}
@Override
public void onScroll(AbsListView absListView, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
if (mOnScrollListener != null) {
mOnScrollListener.onScroll(
absListView, firstVisibleItem,
visibleItemCount, totalItemCount);
}
if (isListViewEmpty) {
scrollHeaderTo(0);
} else {
final View child = absListView.getChildAt(0);
assert child != null;
scrollHeaderTo(child == mFakeHeader ? child.getTop() : -mHeaderHeight);
}
}
});
} else {
// Merge fake header view and content view.
final LinearLayout view = new LinearLayout(activity);
view.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
view.setOrientation(LinearLayout.VERTICAL);
view.addView(mFakeHeader);
view.addView(content);
// Put merged content to ScrollView
final NotifyingScrollView scrollView = new NotifyingScrollView(activity);
scrollView.addView(view);
scrollView.setOnScrollChangedListener(new NotifyingScrollView.OnScrollChangedListener() {
@Override
public void onScrollChanged(ScrollView who, int l, int t, int oldl, int oldt) {
scrollHeaderTo(-t);
}
});
content = scrollView;
}
mFrameLayout.addView(content);
mFrameLayout.addView(mHeader);
// Content overlay view always shows at the top of content.
if ((mContentOverlay = onCreateContentOverlayView(inflater, mFrameLayout)) != null) {
mFrameLayout.addView(mContentOverlay, new FrameLayout.LayoutParams(
ViewGroup.LayoutParams.MATCH_PARENT,
ViewGroup.LayoutParams.MATCH_PARENT));
}
// Post initial scroll
mFrameLayout.post(new Runnable() {
@Override
public void run() {
scrollHeaderTo(0, true);
}
});
return mFrameLayout;
}
private void scrollHeaderTo(int scrollTo) {
scrollHeaderTo(scrollTo, false);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void scrollHeaderTo(int scrollTo, boolean forceChange) {
scrollTo = Math.min(Math.max(scrollTo, -mHeaderHeight), 0);
if (mHeaderScroll == (mHeaderScroll = scrollTo) & !forceChange) return;
setViewTranslationY(mHeader, scrollTo);
setViewTranslationY(mHeaderHeader, -scrollTo);
switch (mHeaderBackgroundScrollMode) {
case HEADER_BACKGROUND_SCROLL_NORMAL:
setViewTranslationY(mHeaderBackground, 0);
break;
case HEADER_BACKGROUND_SCROLL_PARALLAX:
setViewTranslationY(mHeaderBackground, -scrollTo / 1.6f);
break;
case HEADER_BACKGROUND_SCROLL_STATIC:
setViewTranslationY(mHeaderBackground, -scrollTo);
break;
}
if (mContentOverlay != null) {
final ViewGroup.LayoutParams lp = mContentOverlay.getLayoutParams();
final int delta = mHeaderHeight + scrollTo;
lp.height = mFrameLayout.getHeight() - delta;
mContentOverlay.setLayoutParams(lp);
mContentOverlay.setTranslationY(delta);
}
notifyOnHeaderScrollChangeListener(
(float) -scrollTo / mHeaderHeight,
mHeaderHeight,
-scrollTo);
}
@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void setViewTranslationY(View view, float translationY) {
if (view != null) view.setTranslationY(translationY);
}
private void notifyOnHeaderScrollChangeListener(float progress, int height, int scroll) {
if (mOnHeaderScrollChangedListener != null) {
mOnHeaderScrollChangedListener.onHeaderScrollChanged(progress, height, scroll);
}
}
public abstract View onCreateHeaderView(LayoutInflater inflater, ViewGroup container);
public abstract View onCreateContentView(LayoutInflater inflater, ViewGroup container);
public abstract View onCreateContentOverlayView(LayoutInflater inflater, ViewGroup container);
public void setListViewAdapter(ListView listView, ListAdapter adapter) {
isListViewEmpty = adapter == null;
listView.setAdapter(null);
listView.removeHeaderView(mFakeHeader);
listView.addHeaderView(mFakeHeader);
listView.setAdapter(adapter);
}
/**
* {@inheritDoc AbsListView#setOnScrollChangedListener}
*/
public void setListViewOnScrollChangedListener(AbsListView.OnScrollListener listener) {
mOnScrollListener = listener;
}
// //////////////////////////////////////////
// //////////// -- GETTERS -- ///////////////
// //////////////////////////////////////////
public View getHeaderView() {
return mHeader;
}
public View getHeaderHeaderView() {
return mHeaderHeader;
}
public View getHeaderBackgroundView() {
return mHeaderBackground;
}
public int getHeaderBackgroundScrollMode() {
return mHeaderBackgroundScrollMode;
}
}FadingActionBarHelper.java
public class FadingActionBarHelper {
private static final String TAG = "FadingActionBarHelper";
//默认的透明度最大值（255）
private static final int MAX_ALPHA = 220;
private int mAlpha = 255;
private Drawable mDrawable;
private boolean isAlphaLocked;
private final ActionBar mActionBar;
public FadingActionBarHelper(final ActionBar actionBar) {
mActionBar = actionBar;
}
public FadingActionBarHelper(final ActionBar actionBar, final Drawable drawable) {
mActionBar = actionBar;
setActionBarBackgroundDrawable(drawable);
}
public void setActionBarBackgroundDrawable(Drawable drawable) {
setActionBarBackgroundDrawable(drawable, true);
}
@TargetApi(Build.VERSION_CODES.KITKAT)
public void setActionBarBackgroundDrawable(Drawable drawable, boolean mutate) {
mDrawable = mutate ? drawable.mutate() : drawable;
mActionBar.setBackgroundDrawable(mDrawable);
if (mAlpha == MAX_ALPHA) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT)
mAlpha = mDrawable.getAlpha();
} else {
setActionBarAlpha(mAlpha);
}
}
/**
* An {@link android.app.ActionBar} background drawable.
*
* @see #setActionBarBackgroundDrawable(android.graphics.drawable.Drawable)
* @see #setActionBarAlpha(int)
*/
public Drawable getActionBarBackgroundDrawable() {
return mDrawable;
}
/**
* Please use this method for global changes only!
* This is helpful when you need to provide something like
* Navigation drawer: lock ActionBar and set
* {@link android.graphics.drawable.Drawable#setAlpha(int)}
* to {@link #getActionBarBackgroundDrawable()} directly.
*
* @param alpha a value from 0 to 255
* @see #getActionBarBackgroundDrawable()
* @see #getActionBarAlpha()
*/
public void setActionBarAlpha(int alpha) {
if (mDrawable == null) {
Log.w(TAG, "Set action bar background before setting the alpha level!");
return;
}
if (!isAlphaLocked){
mDrawable.setAlpha(alpha);
View view = mActionBar.getCustomView();
if(view!=null){
//这里是对自定义actionbar的其他控件背景的处理，我这边就草草了事了
if(alpha>=55){
view.findViewById(R.id.search_button).setBackgroundResource(R.drawable.search);
view.findViewById(R.id.refresh_button).setBackgroundResource(R.drawable.refresh);
}else{
view.findViewById(R.id.search_button).setBackgroundResource(R.drawable.skin_nav_icon_l_search_rev);
view.findViewById(R.id.refresh_button).setBackgroundResource(R.drawable.skin_nav_icon_r_refresh_rev);
}
//注意！这边是真正设置背景透明度的地方
if(view.getBackground()!=null&&alpha<=MAX_ALPHA){
view.getBackground().setAlpha(alpha);
}
}
}
mAlpha = alpha;
}
public int getActionBarAlpha() {
return mAlpha;
}
/**
* When ActionBar's alpha is locked {@link #setActionBarAlpha(int)}
* won't change drawable\'s alpha (but will change {@link #getActionBarAlpha()} level)
*
* @param lock
*/
public void setActionBarAlphaLocked(boolean lock) {
// Update alpha level on unlock
if (isAlphaLocked != (isAlphaLocked = lock) && !isAlphaLocked) {
setActionBarAlpha(mAlpha);
}
}
public boolean isActionBarAlphaLocked() {
return isAlphaLocked;
}
}我们主要内容MyViewFragment.java
public class MyViewFragment extends HeaderFragment {
private FrameLayout mContentOverlay;
private static final String TAG = "MyViewFragment";
private static int PAGER_START_PLAY = 0x123;
// 切换间隔时间3秒
private static final int PLAY_TIME = 3 * 1000;
// 实现viewpager的控件
private JazzyViewPager mViewPaper;
// 圆形标签的父层
private LinearLayout symbolContainer;
private ImageView[] images;
private ImageView[] circleSymbols;
private ArrayList<String> imageUrlList;
// 图片框架universalimageloader的图形帮助类
private ImageLoader mImageLoader;
private Handler mHandler;
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
setHeaderBackgroundScrollMode(HEADER_BACKGROUND_SCROLL_PARALLAX);
//注意！这个是很屌的方法，用来改变actionbar的透明度
setOnHeaderScrollChangedListener(new OnHeaderScrollChangedListener() {
@Override
public void onHeaderScrollChanged(float progress, int height, int scroll) {
height -= getActivity().getActionBar().getHeight();
progress = (float) scroll / height;
if (progress > 1f) progress = 1f;
progress = (1 - (float) Math.cos(progress * Math.PI)) * 0.5f;
((MainActivity) getActivity())
.getFadingActionBarHelper()
.setActionBarAlpha((int) (255 * progress));
}
});
mImageLoader = ImageLoader.getInstance();
initMockImages();
}
@Override
public void onDetach() {
super.onDetach();
}
@Override
public View onCreateHeaderView(LayoutInflater inflater, ViewGroup container) {
return inflater.inflate(R.layout.fragment_header, container, false);
}
@Override
public View onCreateContentView(LayoutInflater inflater, ViewGroup container) {
View view = inflater.inflate(R.layout.fragment_myview, container, false);
setupMyHandler();
initViews(view);
return view;
}
@Override
public View onCreateContentOverlayView(LayoutInflater inflater, ViewGroup container) {
// ProgressBar progressBar = new ProgressBar(getActivity());
mContentOverlay = new FrameLayout(getActivity());
// mContentOverlay.addView(progressBar, new FrameLayout.LayoutParams(
// ViewGroup.LayoutParams.WRAP_CONTENT,
// ViewGroup.LayoutParams.WRAP_CONTENT, Gravity.CENTER));
// if (mLoaded) mContentOverlay.setVisibility(View.GONE);
return mContentOverlay;
}
private void setupMyHandler() {
mHandler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (PAGER_START_PLAY == msg.what) {
Log.d(TAG, "----PAGER_START_PLAY-----");
int current = mViewPaper.getCurrentItem();
if (current == images.length - 1) {
current = -1;
}
Log.d(TAG, "play item = " + current);
mViewPaper.setCurrentItem(current + 1);
mHandler.sendEmptyMessageDelayed(PAGER_START_PLAY,
PLAY_TIME);
}
}
};
}
private void initViews(View v) {
symbolContainer = (LinearLayout) v.findViewById(R.id.symblo_container);
circleSymbols = new ImageView[imageUrlList.size()];
images = new ImageView[imageUrlList.size()];
for (int i = 0; i < imageUrlList.size(); i++) {
ImageView imageView = new ImageView(getActivity());
ImageView circle = new ImageView(getActivity());
imageView.setScaleType(ScaleType.CENTER_CROP);
images[i] = imageView;
LinearLayout.LayoutParams lp = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT);
lp.setMargins(3, 0, 3, 0);
circle.setLayoutParams(lp);
circle.setTag(i);
circle.setBackgroundDrawable(getResources().getDrawable(
R.drawable.circle_normal));
circleSymbols[i] = circle;
symbolContainer.addView(circleSymbols[i]);
}
setViewPager(v,TransitionEffect.Standard);
}
private void setViewPager(View v,TransitionEffect effect) {
mViewPaper = (JazzyViewPager) v.findViewById(R.id.adviewpaper);
mViewPaper.setTransitionEffect(effect);
mViewPaper.setAdapter(new MyPagerAdapter());
mViewPaper.setOnPageChangeListener(new MyPageViewChangeListener());
mViewPaper.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (imageUrlList.size() == 0 || imageUrlList.size() == 1) {
return true;
} else {
return false;
}
}
});
circleSymbols[0].setBackgroundDrawable(getResources().getDrawable(
R.drawable.circle_selected));
mViewPaper.setCurrentItem(0);
mHandler.sendEmptyMessageDelayed(PAGER_START_PLAY, PLAY_TIME);
}
/**
* 创建本地图片数据
*/
private void initMockImages() {
imageUrlList = new ArrayList<String>();
imageUrlList.add("drawable://" + R.drawable.jd_ad_0);
imageUrlList.add("drawable://" + R.drawable.jd_ad_1);
imageUrlList.add("drawable://" + R.drawable.jd_ad_2);
imageUrlList.add("drawable://" + R.drawable.jd_ad_3);
imageUrlList.add("drawable://" + R.drawable.jd_ad_4);
}
/**
* 设置圆形标签的状态
*
* @param index
* 当前标签的位置
*/
private void setSymbolImages(int index) {
for (ImageView image : circleSymbols) {
Integer i = (Integer) image.getTag();
if (i == index) {
image.setBackgroundDrawable(getResources().getDrawable(
R.drawable.circle_selected));
} else {
image.setBackgroundDrawable(getResources().getDrawable(
R.drawable.circle_normal));
}
}
}
private class MyPagerAdapter extends PagerAdapter {
@Override
public int getCount() {
return imageUrlList.size();
}
@Override
public boolean isViewFromObject(View view, Object obj) {
if (view instanceof OutlineContainer) {
return ((OutlineContainer) view).getChildAt(0) == obj;
} else {
return view == obj;
}
}
@Override
public void destroyItem(ViewGroup container, int position, Object object) {
((ViewPager) container).removeView(mViewPaper
.findViewFromObject(position));
}
@Override
public Object instantiateItem(ViewGroup container, int position) {
mImageLoader.displayImage(imageUrlList.get(position),
images[position]);
container.addView(images[position], LayoutParams.MATCH_PARENT,
LayoutParams.MATCH_PARENT);
final int index = position;
images[position].setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Log.e(TAG, "you clicked images position is" + index);
Toast.makeText(getActivity(),
"你点击了第" + (index + 1) + "张图", Toast.LENGTH_SHORT)
.show();
}
});
// 注意！不加这个方法要报IllegalStateException
mViewPaper.setObjectForPosition(images[position], position);
return images[position];
}
}
private class MyPageViewChangeListener implements OnPageChangeListener {
@Override
public void onPageScrollStateChanged(int stateCode) {
switch (stateCode) {
case 0:
// 你什么都没动
break;
case 1:
// 正在滑动哦
break;
case 2:
// 滑动完了
break;
}
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
@Override
public void onPageSelected(int position) {
Log.d(TAG, "onPageSelected-->position:" + position);
setSymbolImages(position);
}
}
}好了。demo的下载连接:点击打开链接
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