HardBirch

仿网易新闻效果源码分析

时间:12-11-08 栏目:安卓源码解析与小应用 作者:张飞不张,文采横飞 评论:0 点击: 3,816 次

  一直想知道这种效果到底是如何做出来的,直到看到代码,原来还是动画。从网上找了两份代码,原理基本相同,两份代码中应该有相互参考部分,现在简单解析下,做一个记录,另外,代码中做了些许不妨碍功能的修改(如果有时间的话,自己也会考虑用fragment实现下)。先看下效果图:


这里主要讲解的是以下部分:


先看下注释里面的说明:

/**
 * Android实现局部图片滑动指引效果
 * @Description: 实现以下功能:
 * 1、顶部单张图片左右拖拉滑动;
 * 2、带指引;
 * 3、仅滑动顶部单张图片,不滑动页面,下面的图文内容不动;
 * 4、类似于新闻客户端的功能

看下它的主Activity里面的全局变量(也就是上面图形):

public class MainActivity extends ActivityGroup implements OnClickListener{
	// 选中的新闻条目
	private TextView mSelectedItem = null;
	// 头部新闻条目的Layout
	private RelativeLayout mHeader = null;
	// 中间新闻主体的Layout
	private RelativeLayout mNewsMainLayout = null;
	private LayoutParams params = null;
	//顶部提示
	private TextView mNetEaseTop = null;
	// 新闻分类
	private TextView mNewsItem = null;
	private TextView mInfoItem = null;
	private TextView mBlogItem = null;
	private TextView mMagezineItem = null;
	private TextView mDomainItem = null;
	private TextView mMoreItem = null;

	// 新闻分类中每条分类的宽度
	private int mItemWidth = 0;
	// 条目背景移动开始位置
	private int startX = 0;
	private Intent mIntent = null;
	// 设置新闻主题
	private View mNewsMain = null;

注释比较详细。可以看到这个activity继承自activityGroup类,而activityGroup类在3.0以后是deprecated,所以在开头说想要用fragment重新实现一下。

Deprecated. Use the new Fragment and FragmentManager APIs instead; these are also available on older platforms through the Android compatibility package.

再看onCreate方法:

@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        // 初始化控件
        initeViews();
    }

    /**
     * 初始化控件
     */
    private void initeViews(){
    	mNewsItem = (TextView) findViewById(R.id.tv_title_news);
    	mInfoItem = (TextView) findViewById(R.id.tv_title_info);
    	mBlogItem = (TextView) findViewById(R.id.tv_title_blog);
    	mMagezineItem = (TextView) findViewById(R.id.tv_title_magazine);
    	mDomainItem = (TextView) findViewById(R.id.tv_title_domain);
    	mMoreItem = (TextView) findViewById(R.id.tv_title_more);

    	mNewsItem.setOnClickListener(this);
    	mInfoItem.setOnClickListener(this);
    	mBlogItem.setOnClickListener(this);
    	mMagezineItem.setOnClickListener(this);
    	mDomainItem.setOnClickListener(this);
    	mMoreItem.setOnClickListener(this);

    	// 设置选中条目属性
    	mSelectedItem = new TextView(this);
    	mSelectedItem.setText(R.string.title_news_category_tops);
    	mSelectedItem.setTextColor(Color.WHITE);
    	mSelectedItem.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 17);
    	mSelectedItem.setGravity(Gravity.CENTER);
    	mSelectedItem.setWidth((getScreenWidth() - DimensionUtility.dip2px(this, 20)) / 6);
    	mSelectedItem.setBackgroundResource(R.drawable.slidebar);
    	RelativeLayout.LayoutParams param = new RelativeLayout.LayoutParams(
    			LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
    	param.addRule(RelativeLayout.CENTER_VERTICAL, RelativeLayout.TRUE);

    	mHeader = (RelativeLayout) findViewById(R.id.layout_title_bar);
    	mNetEaseTop = (TextView) findViewById(R.id.tv_netease_top);

    	mHeader.addView(mSelectedItem, param);

    	// 设置头条新闻主体
    	mIntent = new Intent(MainActivity.this, TopicNews.class);
    	mNewsMain = getLocalActivityManager().startActivity(
    			"TopicNews", mIntent).getDecorView();
    	params = new LayoutParams(
    			LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT);
    	mNewsMainLayout = (RelativeLayout) findViewById(R.id.layout_news_main);
    	mNewsMainLayout.addView(mNewsMain, params);
    }

这里所说的选中条目,就是上图中,选中的高亮部分,它其实可以理解为和下面六个是上下两层的关系。而mNetEaseTop是指的


这一块内容,在原代码中,作者并未做这一块和下面内容的同时更新,个人后来加上。设置头条新闻主题下面就是设置默认选择项:第一项(头条新闻)。

再来看一下里面用到的布局文件:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:weightSum="10" >

    <include
        android:id="@+id/header"
        layout="@layout/header" />

    <RelativeLayout
        android:id="@+id/layout_news_main"
        android:layout_width="fill_parent"
        android:layout_height="0dp"
        android:layout_weight="9" >
    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/layout_bottom"
        android:layout_weight="1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <RadioGroup
            android:id="@+id/radiogroup"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:background="@drawable/bottombg"
            android:gravity="center_vertical"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/radio_news"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_news"
                android:button="@null"
                android:checked="true" />

            <RadioButton
                android:id="@+id/radio_topic"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_topic"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_pic"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_pic"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_follow"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_follow"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_vote"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_vote"
                android:button="@null" />
        </RadioGroup>
    </RelativeLayout>

</LinearLayout>



中间的layout_new_main就是mNewsMainLayout,起到一个占位的作用,下面的RadioGroup就是最下面的标记栏。里面用到的布局文件主要是header.xml:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <RelativeLayout
        android:id="@+id/layout_top"
        android:layout_width="match_parent"
        android:layout_height="40dip"
        android:background="#990000" >

        <TextView
            android:id="@+id/tv_netease_top"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_marginLeft="10dip"
            android:textSize="20sp"
            android:textColor="@android:color/white"
            android:text="@string/news_top_left_text1" />

        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerVertical="true"
            android:layout_toRightOf="@+id/tv_netease_top"
            android:text="@string/news_top_left_text2"
            android:textColor="@android:color/white"
            android:textSize="20sp" />

        <ImageView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"
            android:src="@drawable/duoyun"
            android:contentDescription="@string/img_duoyun_desc" />

    </RelativeLayout>

    <RelativeLayout
        android:id="@+id/layout_title_bar"
        android:layout_width="fill_parent"
        android:layout_height="40dip"
        android:paddingLeft="5dip"
        android:paddingRight="5dip"
        android:background="@drawable/bg_header_top">

        <LinearLayout
            android:id="@+id/header_item"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal" >

            <RelativeLayout
                android:id="@+id/layout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_news"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_tops" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_info"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_info" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_blog"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_blog" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_magazine"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_magazine" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_domain"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_domain" />

            </RelativeLayout>

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" >

                <TextView
                    android:id="@+id/tv_title_more"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_centerInParent="true"
                    style="@style/header_title_style"
                    android:gravity="center"
                    android:text="@string/title_news_category_more" />
            </RelativeLayout>
        </LinearLayout>
    </RelativeLayout>
</LinearLayout>

比较简单的布局,不详述。

上面代码设置选中项宽带:

mSelectedItem.setWidth((getScreenWidth() - DimensionUtility.dip2px(this, 20)) / 6);

用到了getScreenWidth方法:

/**
     * 获取屏幕的宽度
     * @return
     */
    private int getScreenWidth(){
    	WindowManager windowManager = getWindowManager();
		Display display = windowManager.getDefaultDisplay();
//		Point point = new Point();
//		display.getSize(point);
//		int screenWidth = point.x;
		int screenWidth = display.getWidth();
		return screenWidth;
    }

display的getWidth方法在3.0中好像也没deprecated。可以使用注释掉的代码获取屏幕宽度。

下面是最重要的部分点击切换:

// 新闻分类事件监听
	@Override
	public void onClick(View v) {
		mItemWidth = findViewById(R.id.layout).getWidth();

		switch (v.getId()) {
		case R.id.tv_title_news:
			//动画滑动
			ImageAnimation.SetImageSlide(mSelectedItem, startX, 0, 0, 0);
			//设置滑动后动画开始位置
			startX = 0;
			//设置选中项显示文字,也就是高亮部分文字
			mSelectedItem.setText(R.string.title_news_category_tops);
			//设置左上角提示文字
			mNetEaseTop.setText(R.string.title_news_category_tops);

			// 显示头条信息
			mIntent.setClass(MainActivity.this, TopicNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"TopicNews", mIntent).getDecorView();
			break;
		case R.id.tv_title_info:
			ImageAnimation.SetImageSlide(mSelectedItem, startX, mItemWidth, 0, 0);
			startX = mItemWidth;
			mSelectedItem.setText(R.string.title_news_category_info);
			mNetEaseTop.setText(R.string.title_news_category_info);

			// 显示资讯信息
			mIntent.setClass(MainActivity.this, InfoNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"InfoNews", mIntent).getDecorView();
			break;
		case R.id.tv_title_blog:
			ImageAnimation.SetImageSlide(mSelectedItem, startX, mItemWidth * 2, 0, 0);
			startX = mItemWidth * 2;
			mSelectedItem.setText(R.string.title_news_category_blog);
			mNetEaseTop.setText(R.string.title_news_category_blog);

			// 显示博客信息
			mIntent.setClass(MainActivity.this, BlogNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"BlogNews", mIntent).getDecorView();
			break;
		case R.id.tv_title_magazine:
			ImageAnimation.SetImageSlide(mSelectedItem, startX, mItemWidth * 3, 0, 0);
			startX = mItemWidth * 3;
			mSelectedItem.setText(R.string.title_news_category_magazine);
			mNetEaseTop.setText(R.string.title_news_category_magazine);

			// 显示杂志信息
			mIntent.setClass(MainActivity.this, MagazineNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"MagazineNews", mIntent).getDecorView();
			break;
		case R.id.tv_title_domain:
			ImageAnimation.SetImageSlide(mSelectedItem, startX, mItemWidth * 4, 0, 0);
			startX = mItemWidth * 4;
			mSelectedItem.setText(R.string.title_news_category_domain);
			mNetEaseTop.setText(R.string.title_news_category_domain);
			// 显示业界信息
			mIntent.setClass(MainActivity.this, DomainNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"DomainNews", mIntent).getDecorView();
			break;
		case R.id.tv_title_more:
			ImageAnimation.SetImageSlide(mSelectedItem, startX, mItemWidth * 5, 0, 0);
			startX = mItemWidth * 5;
			mSelectedItem.setText(R.string.title_news_category_more);
			mNetEaseTop.setText(R.string.title_news_category_more);

			// 显示更多信息
			mIntent.setClass(MainActivity.this, MoreNews.class);
			mNewsMain = getLocalActivityManager().startActivity(
	    			"MoreNews", mIntent).getDecorView();
			break;
		default:
			break;
		}
		// 更换Layout中的新闻主体
		mNewsMainLayout.removeAllViews();
		mNewsMainLayout.addView(mNewsMain, params);
	}

在注释中,解释的已经比较清楚了,看一下ImageAnimation:

public class ImageAnimation {
	/**
	 * 设置图像移动动画效果
	 * @param v
	 * @param startX
	 * @param toX
	 * @param startY
	 * @param toY
	 */
	public static void SetImageSlide(View v, int startX, int toX, int startY, int toY) {
		TranslateAnimation anim = new TranslateAnimation(startX, toX, startY, toY);
		anim.setDuration(100);
		anim.setFillAfter(true);
		v.startAnimation(anim);
	}
}

就是一个简单的移动动画。这样就是简单的顶部标示就完成了,接下来要分析如下:



这个代码在TopicNews中,先看下使用到的全局变量:

public class TopicNews extends Activity{
	// 滑动图片的集合
	private ArrayList<View> mImagePageViewList = null;
	private ViewGroup mMainView = null;
	private ViewPager mViewPager = null;
	// 当前ViewPager索引
//	private int pageIndex = 0; 

	// 包含圆点图片的View
	private ViewGroup mImageCircleView = null;
	private ImageView[] mImageCircleViews = null; 

	// 滑动标题
	private TextView mSlideTitle = null;

	// 布局设置类
	private SlideImageLayout mSlideLayout = null;
	// 数据解析类
	private NewsXmlParser mParser = null; 

 里面的viewPager类是用于滑动控件,SlideImageLayout类是用于上面图片和下面标志点的布局。NewsXmlParser类提供数据。

看一下onCreate方法:

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setTheme(android.R.style.Theme_Translucent_NoTitleBar);
		// 初始化
		initeViews();
	}

	/**
	 * 初始化
	 */
	private void initeViews(){
		// 滑动图片区域
		mImagePageViewList = new ArrayList<View>();
		LayoutInflater inflater = getLayoutInflater();
		mMainView = (ViewGroup)inflater.inflate(R.layout.page_topic_news, null);
		mViewPager = (ViewPager) mMainView.findViewById(R.id.image_slide_page);  

		// 圆点图片区域
		mParser = new NewsXmlParser();
		int length = mParser.getSlideImages().length;
		mImageCircleViews = new ImageView[length];
		mImageCircleView = (ViewGroup) mMainView.findViewById(R.id.layout_circle_images);
		mSlideLayout = new SlideImageLayout(TopicNews.this);
		mSlideLayout.setCircleImageLayout(length);

		for(int i = 0; i < length; i++){
			mImagePageViewList.add(mSlideLayout.getSlideImageLayout(mParser.getSlideImages()[i]));
			mImageCircleViews[i] = mSlideLayout.getCircleImageLayout(i);
			mImageCircleView.addView(mSlideLayout.getLinearLayout(mImageCircleViews[i], 10, 10));
		}

		// 设置默认的滑动标题
		mSlideTitle = (TextView) mMainView.findViewById(R.id.tvSlideTitle);
		mSlideTitle.setText(mParser.getSlideTitles()[0]);

		setContentView(mMainView);

		// 设置ViewPager
        mViewPager.setAdapter(new SlideImageAdapter());
        mViewPager.setOnPageChangeListener(new ImagePageChangeListener());
	}

看一下远点图片区域:

// 圆点图片区域
		mParser = new NewsXmlParser();
		int length = mParser.getSlideImages().length;
		mImageCircleViews = new ImageView[length];
		mImageCircleView = (ViewGroup) mMainView.findViewById(R.id.layout_circle_images);
		mSlideLayout = new SlideImageLayout(TopicNews.this);
		mSlideLayout.setCircleImageLayout(length);

		for(int i = 0; i < length; i++){
			mImagePageViewList.add(mSlideLayout.getSlideImageLayout(mParser.getSlideImages()[i]));
			mImageCircleViews[i] = mSlideLayout.getCircleImageLayout(i);
			mImageCircleView.addView(mSlideLayout.getLinearLayout(mImageCircleViews[i], 10, 10));
		}

里面主要是调用了NewsXmlParser类和SlideImageLayout的方法,那就先看下NewsXmlParser的getSlideImages方法:

public int[] getSlideImages(){
		return slideImages;
	}

这里的slideImage是在类中定义好的:

// 滑动图片的集合,这里设置成了固定加载,当然也可动态加载。
	private int[] slideImages = {
			R.drawable.image01,
			R.drawable.image02,
			R.drawable.image03,
			R.drawable.image04,
			R.drawable.image05};

那看一下用到的SlideImageLayout类的getSlideImageLayout:获取图片的布局:

/**
	 * 生成滑动图片区域布局
	 * @param id
	 * @return
	 */
	public View getSlideImageLayout(int id){
		// 包含TextView的LinearLayout
		LinearLayout imageLinerLayout = new LinearLayout(mContext);
		LinearLayout.LayoutParams imageLinerLayoutParames = new LinearLayout.LayoutParams(
				LinearLayout.LayoutParams.WRAP_CONTENT,
				LinearLayout.LayoutParams.WRAP_CONTENT,
				1);

		ImageView iv = new ImageView(mContext);
		iv.setBackgroundResource(id);
		iv.setOnClickListener(new ImageOnClickListener());
		imageLinerLayout.addView(iv,imageLinerLayoutParames);
		mImageList.add(iv);

		return imageLinerLayout;
	}

创建一个layout,然后再创建一个imageView,把ImageView加入到layout中,然后返回layout。同理,我们再看下set和getCircleImageLayout:


 * 设置圆点个数
	 * @param size
	 */
	public void setCircleImageLayout(int size){
		mImageViews = new ImageView[size];
	}

	/**
	 * 生成圆点图片区域布局对象
	 * @param index
	 * @return
	 */
	public ImageView getCircleImageLayout(int index){
		mImageView = new ImageView(mContext);
		mImageView.setLayoutParams(new LayoutParams(10,10));
        mImageView.setScaleType(ScaleType.FIT_XY);

        mImageViews[index] = mImageView;

        if (index == 0) {
            //默认选中第一张图片
            mImageViews[index].setBackgroundResource(R.drawable.dot_selected);
        } else {
            mImageViews[index].setBackgroundResource(R.drawable.dot_none);
        }  

        return mImageViews[index];
	}


获取圆点图片的Image,然后返回。

在initViews中还有设置滑动图片标题:


// 设置默认的滑动标题
		mSlideTitle = (TextView) mMainView.findViewById(R.id.tvSlideTitle);
		mSlideTitle.setText(mParser.getSlideTitles()[0]);

		setContentView(mMainView);

最后是设置Viewpager的Adapter还有监听

// 设置ViewPager
        mViewPager.setAdapter(new SlideImageAdapter());
        mViewPager.setOnPageChangeListener(new ImagePageChangeListener());

先来看下SlideImageAdapter类:

// 滑动图片数据适配器
    private class SlideImageAdapter extends PagerAdapter {
        @Override
        public int getCount() {
            return mImagePageViewList.size();
        }  

        @Override
        public boolean isViewFromObject(View view, Object object) {
            return view == object;
        }  

        @Override
        public int getItemPosition(Object object) {
            return super.getItemPosition(object);
        }  

        @Override
        public void destroyItem(View view, int arg1, Object arg2) {
            ((ViewPager) view).removeView(mImagePageViewList.get(arg1));
        }  

        @Override
        public Object instantiateItem(View view, int position) {
        	((ViewPager) view).addView(mImagePageViewList.get(position));

            return mImagePageViewList.get(position);
        }  

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {  

        }  

        @Override
        public Parcelable saveState() {
            return null;
        }  

        @Override
        public void startUpdate(View arg0) {
        }  

        @Override
        public void finishUpdate(View arg0) {
        }
    }

一个典型的适配器类,主要看下面两个方法:

@Override
        public void destroyItem(View view, int arg1, Object arg2) {
            ((ViewPager) view).removeView(mImagePageViewList.get(arg1));
        }  

        @Override
        public Object instantiateItem(View view, int position) {
        	((ViewPager) view).addView(mImagePageViewList.get(position));

            return mImagePageViewList.get(position);
        }  

实例化Item和销毁Item。我们在initViews方法里面为mImagePageViewList里面加载了很多view,在这里取出,加入到ViewPager中去。

其实他的滑动监听事件特别简单,就是改变下选中图片、标识圆点和标题文字:

// 滑动页面更改事件监听器
    private class ImagePageChangeListener implements OnPageChangeListener {
        @Override
        public void onPageScrollStateChanged(int arg0) {
        }  

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
        }  

        @Override
        public void onPageSelected(int index) {
//        	pageIndex = index;
        	mSlideLayout.setPageIndex(index);
        	mSlideTitle.setText(mParser.getSlideTitles()[index]);

            for (int i = 0; i < mImageCircleViews.length; i++) {
            	mImageCircleViews[index].setBackgroundResource(R.drawable.dot_selected);

                if (index != i) {
                	mImageCircleViews[i].setBackgroundResource(R.drawable.dot_none);
                }
            }
        }
    }

还有,在网易新闻里,有个底部标记栏:

这个功能是如何实现的呢?

<RelativeLayout
        android:id="@+id/layout_bottom"
        android:layout_weight="1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >

        <RadioGroup
            android:id="@+id/radiogroup"
            android:layout_width="fill_parent"
            android:layout_height="0dp"
            android:background="@drawable/bottombg"
            android:gravity="center_vertical"
            android:orientation="horizontal" >

            <RadioButton
                android:id="@+id/radio_news"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_news"
                android:button="@null"
                android:checked="true" />

            <RadioButton
                android:id="@+id/radio_topic"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_topic"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_pic"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_pic"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_follow"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_follow"
                android:button="@null" />

            <RadioButton
                android:id="@+id/radio_vote"
                android:layout_width="wrap_content"
                android:background="@drawable/tab_selector_vote"
                android:button="@null" />
        </RadioGroup>
    </RelativeLayout>

其中background图片:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/current_topic_tab" android:state_checked="true"/>
    <item android:drawable="@drawable/back_topic_tab" android:state_checked="false"/>

</selector>

切换代码:

@Override
	public void onCheckedChanged(RadioGroup group, int checkedId) {

		switch (checkedId) {
		case R.id.radio_news:
			ImageAnimation.SetImageSlide(mImageView, startLeft, 0, 0, 0);
			startLeft = 0;
			break;
		case R.id.radio_topic:
			ImageAnimation.SetImageSlide(mImageView, startLeft, mImageView.getWidth(), 0, 0);
			startLeft = mImageView.getWidth();

			break;
		case R.id.radio_pic:
			ImageAnimation.SetImageSlide(mImageView, startLeft, mImageView.getWidth() * 2, 0, 0);
			startLeft = mImageView.getWidth() * 2;
			break;
		case R.id.radio_follow:
			ImageAnimation.SetImageSlide(mImageView, startLeft, mImageView.getWidth() * 3, 0, 0);
			startLeft = mImageView.getWidth() * 3;
			break;
		case R.id.radio_vote:
			ImageAnimation.SetImageSlide(mImageView, startLeft, mImageView.getWidth() * 4, 0, 0);
			startLeft = mImageView.getWidth() * 4;
			break;

		default:
			break;
		}
	


最后代码下载地址:

http://download.csdn.net/detail/aomandeshangxiao/4751356


声明: 本文由( 张飞不张,文采横飞 )原创编译,转载请保留链接: 仿网易新闻效果源码分析

仿网易新闻效果源码分析:等您坐沙发呢!

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