app引导页(背景图片切换加各个页面动画效果)

前言:不知不觉中又加班到了10点半,整个启动页面做了一天多的时间,一共有三个页面,每个页面都有动画效果,动画效果调试起来麻烦,既要跟ios统一,又要匹配各种不同的手机,然后产品经理还有可能在中途改需求,程序员各种苦逼有木有,在这个过程中也学到了蛮多东西的,所以写一篇博客跟大家分享一下.

 

先看效果图:

1.显示三个页面的Activity  用view pager去加载三个fragment实现,控制点点点的切换,监听view pager的切换,控制fragment动画的开始跟结束,重写了view pager,实现了背景图片的移动效果.

/**
 * 主Activity
 * @author ansen
 * @create time 2015-08-07
 */
public class KaKaLauncherActivity extends FragmentActivity {
    private GuideViewPager vPager;
    private List<LauncherBaseFragment> list = new ArrayList<LauncherBaseFragment>();
    private BaseFragmentAdapter adapter;

    private ImageView[] tips;
    private int currentSelect;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_luancher_main);

        //初始化点点点控件
        ViewGroup group = (ViewGroup)findViewById(R.id.viewGroup);
        tips = new ImageView[3];
        for (int i = 0; i < tips.length; i++) {
            ImageView imageView = new ImageView(this);
            imageView.setLayoutParams(new LayoutParams(10, 10));
            if (i == 0) {
                imageView.setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                imageView.setBackgroundResource(R.drawable.page_indicator_unfocused);
            }
            tips[i]=imageView;

            LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(new ViewGroup.LayoutParams(LayoutParams.WRAP_CONTENT,LayoutParams.WRAP_CONTENT));
            layoutParams.leftMargin = 20;//设置点点点view的左边距
            layoutParams.rightMargin = 20;//设置点点点view的右边距
            group.addView(imageView,layoutParams);
        }

        //获取自定义viewpager 然后设置背景图片
        vPager = (GuideViewPager) findViewById(R.id.viewpager_launcher);
        vPager.setBackGroud(BitmapFactory.decodeResource(getResources(),R.drawable.bg_kaka_launcher));

        /**
         * 初始化三个fragment  并且添加到list中
         */
        RewardLauncherFragment rewardFragment = new RewardLauncherFragment();
        PrivateMessageLauncherFragment privateFragment = new PrivateMessageLauncherFragment();
        StereoscopicLauncherFragment stereoscopicFragment = new StereoscopicLauncherFragment();
        list.add(rewardFragment);
        list.add(privateFragment);
        list.add(stereoscopicFragment);

        adapter = new BaseFragmentAdapter(getSupportFragmentManager(),list);
        vPager.setAdapter(adapter);
        vPager.setOffscreenPageLimit(2);
        vPager.setCurrentItem(0);
        vPager.setOnPageChangeListener(changeListener);
    }

    /**
     * 监听viewpager的移动
     */
    OnPageChangeListener changeListener=new OnPageChangeListener() {
        @Override
        public void onPageSelected(int index) {
            setImageBackground(index);//改变点点点的切换效果
            LauncherBaseFragment fragment=list.get(index);

            list.get(currentSelect).stopAnimation();//停止前一个页面的动画
            fragment.startAnimation();//开启当前页面的动画

            currentSelect=index;
        }

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

    /**
     * 改变点点点的切换效果
     * @param selectItems
     */
    private void setImageBackground(int selectItems) {
        for (int i = 0; i < tips.length; i++) {
            if (i == selectItems) {
                tips[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                tips[i].setBackgroundResource(R.drawable.page_indicator_unfocused);
            }
        }
    }
}

2.重写viewpager   在dispatchDraw方法中控制显示的背景图片区域,

/**
 * 重写ViewPager  主要做一个切换背景的功能
 * @author ansen
 * @create time 2015-08-07
 */
public class GuideViewPager extends ViewPager {
    private Bitmap bg;
    private Paint b = new Paint(1);

    public GuideViewPager(Context context) {
        super(context);
    }

    public GuideViewPager(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    @Override
    protected void dispatchDraw(Canvas canvas) {
        if (this.bg != null) {
            int width = this.bg.getWidth();
            int height = this.bg.getHeight();
            int count = getAdapter().getCount();
            int x = getScrollX();
            // 子View中背景图片需要显示的宽度，放大背景图或缩小背景图。
            int n = height * getWidth() / getHeight();

            /**
             * (width - n) / (count - 1)表示除去显示第一个ViewPager页面用去的背景宽度，剩余的ViewPager需要显示的背景图片的宽度。
             * getWidth()等于ViewPager一个页面的宽度，即手机屏幕宽度。在该计算中可以理解为滑动一个ViewPager页面需要滑动的像素值。
             * ((width - n) / (count - 1)) /getWidth()也就表示ViewPager滑动一个像素时，背景图片滑动的宽度。
             * x * ((width - n) / (count - 1)) /  getWidth()也就表示ViewPager滑动x个像素时，背景图片滑动的宽度。
             * 背景图片滑动的宽度的宽度可以理解为背景图片滑动到达的位置。
             */
            int w = x * ((width - n) / (count - 1)) / getWidth();
            canvas.drawBitmap(this.bg, new Rect(w, 0, n + w, height), new Rect( x, 0, x + getWidth(), getHeight()), this.b);
        }
        super.dispatchDraw(canvas);
    }

    public void setBackGroud(Bitmap paramBitmap) {
        this.bg = paramBitmap;
        this.b.setFilterBitmap(true);
    }
}

3.主体布局文件  上面放一个自定义的viewpager  下面放一个显示点点的RelativeLayout

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <com.example.view.GuideViewPager
        android:id="@+id/viewpager_launcher"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <RelativeLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical" >

        <LinearLayout
            android:id="@+id/viewGroup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_marginBottom="30dp"
            android:gravity="center_horizontal"
            android:orientation="horizontal" />
    </RelativeLayout>

</RelativeLayout>

4.ViewPager适配器

/**
 * Viewpager适配器
 * @author apple
 *
 */
public class BaseFragmentAdapter extends FragmentStatePagerAdapter {
    private List<LauncherBaseFragment>list;
    public BaseFragmentAdapter(FragmentManager fm, List<LauncherBaseFragment> list) {
        super(fm);
        this.list = list;
    }

    public BaseFragmentAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int arg0) {
        return list.get(arg0);
    }

    @Override
    public int getCount() {
        return list.size();
    }
}

5.Fragment抽象类 有两个抽象方法,开启动画跟停止动画  所有的Fragment都继承这个类  Viewpager切换的时候可以更好的控制每个Fragment开启动画,结束动画

/**
 * Fragment抽象类
 * @author ansen
 *
 */
public abstract class LauncherBaseFragment extends Fragment{
    public abstract void  startAnimation();
    public abstract void  stopAnimation();
}

6.打赏页Fragment  三个动画效果  硬币向下移动动画+打赏图片缩放动画+改变打赏图片透明度然后隐藏图片

/**
 * 打赏页面
 * @author ansen
 * @create time 2015-08-07
 */
public class RewardLauncherFragment extends LauncherBaseFragment{
    private ImageView ivReward;
    private ImageView ivGold;

    private Bitmap goldBitmap;
    private boolean started;//是否开启动画(ViewPage滑动时候给这个变量赋值)

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View rooView=inflater.inflate(R.layout.fragment_reward_launcher, null);
        ivGold=(ImageView) rooView.findViewById(R.id.iv_gold);
        ivReward=(ImageView) rooView.findViewById(R.id.iv_reward);

        //获取硬币的高度
        goldBitmap=BitmapFactory.decodeResource(getActivity().getResources(),R.drawable.icon_gold);
        startAnimation();
        return rooView;
    }

    public void startAnimation(){
        started=true;

        //向下移动动画 硬币的高度*2+80
        TranslateAnimation translateAnimation=new TranslateAnimation(0,0,0,goldBitmap.getHeight()*2+80);
        translateAnimation.setDuration(500);
        translateAnimation.setFillAfter(true);

        ivGold.startAnimation(translateAnimation);
        translateAnimation.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {}
            @Override
            public void onAnimationEnd(Animation animation){
                if(started){
                    ivReward.setVisibility(View.VISIBLE);
                    //硬币移动动画结束开启缩放动画
                    Animation anim=AnimationUtils.loadAnimation(getActivity(),R.anim.reward_launcher);
                    ivReward.startAnimation(anim);
                    anim.setAnimationListener(new AnimationListener(){
                        @Override
                        public void onAnimationStart(Animation animation) {}
                        @Override
                        public void onAnimationRepeat(Animation animation) {}
                        @Override
                        public void onAnimationEnd(Animation animation) {
                                //缩放动画结束 开启改变透明度动画
                                AlphaAnimation alphaAnimation=new AlphaAnimation(1,0);
                                alphaAnimation.setDuration(1000);
                                ivReward.startAnimation(alphaAnimation);
                                alphaAnimation.setAnimationListener(new AnimationListener() {
                                    @Override
                                    public void onAnimationStart(Animation animation) {}
                                    @Override
                                    public void onAnimationRepeat(Animation animation) {}
                                    @Override
                                    public void onAnimationEnd(Animation animation) {
                                        //透明度动画结束隐藏图片
                                        ivReward.setVisibility(View.GONE);
                                    }
                            });
                        }
                    });
                }
            }
            @Override
            public void onAnimationRepeat(Animation animation) {}
        });
    }

    @Override
    public void stopAnimation(){
        started=false;//结束动画时标示符设置为false
        ivGold.clearAnimation();//清空view上的动画
    }
}

7.私信页面   四个动画效果   并且四个动画都相同,其实只要我们实现了一个,其他的基本都很容易了.   依次实现四个图片的放大然后还原

/**
 * 私信
 * @author ansen
 */
public class PrivateMessageLauncherFragment extends LauncherBaseFragment{
    private ImageView ivLikeVideo,ivThinkReward,ivThisWeek,ivWatchMovie;

    private Animation likeAnimation,thinkAnimation,watchAnimation,thisWeekAnimation;

    private boolean started;//是否开启动画

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View rooView=inflater.inflate(R.layout.fragment_private_message_launcher, null);

        ivLikeVideo=(ImageView) rooView.findViewById(R.id.iv_private_message_like_video);
        ivThinkReward=(ImageView) rooView.findViewById(R.id.iv_private_message_think_reward);
        ivWatchMovie=(ImageView) rooView.findViewById(R.id.iv_private_message_watch_movie);
        ivThisWeek=(ImageView) rooView.findViewById(R.id.private_message_this_week);
        return rooView;
    }

    public void stopAnimation(){
        //动画开启标示符设置成false
        started=false;
        /**
         * 清空所有控件上的动画
         */
        ivLikeVideo.clearAnimation();
        ivThinkReward.clearAnimation();
        ivWatchMovie.clearAnimation();
        ivThisWeek.clearAnimation();
    }


    public void startAnimation(){
        started=true;

        /**
         * 每次开启动画前先隐藏控件
         */
        ivLikeVideo.setVisibility(View.GONE);
        ivThinkReward.setVisibility(View.GONE);
        ivWatchMovie.setVisibility(View.GONE);
        ivThisWeek.setVisibility(View.GONE);

        new Handler().postDelayed(new Runnable() {//延时0.5秒之后开启喜欢视频动画
            @Override
            public void run(){
                if(started)
                    likeVideoAnimation();
            }
        },500);
    }

    /**
     * 好喜欢你的视频
     */
    private void likeVideoAnimation(){
        ivLikeVideo.setVisibility(View.VISIBLE);

        likeAnimation = AnimationUtils.loadAnimation(getActivity(),R.anim.private_message_launcher);
        ivLikeVideo.startAnimation(likeAnimation);//开启动画
        likeAnimation.setAnimationListener(new AnimationListener(){
            @Override
            public void onAnimationStart(Animation animation) {}
            @Override
            public void onAnimationRepeat(Animation animation) {}
            @Override
            public void onAnimationEnd(Animation animation) {//监听动画结束
                    if(started)
                        thinkReward();
            }
        });
    }

    /**
     * 谢谢你的打赏
     */
    private void thinkReward(){
        ivThinkReward.setVisibility(View.VISIBLE);
        thinkAnimation = AnimationUtils.loadAnimation(getActivity(),R.anim.private_message_launcher);
        ivThinkReward.startAnimation(thinkAnimation);
        thinkAnimation.setAnimationListener(new AnimationListener(){
            @Override
            public void onAnimationStart(Animation animation) {}
            @Override
            public void onAnimationRepeat(Animation animation) {}
            @Override
            public void onAnimationEnd(Animation animation) {
                if(started)
                    watchMovie();
            }
        });
    }

    /**
     * 一起看个电影呗
     */
    private void watchMovie(){
        ivWatchMovie.setVisibility(View.VISIBLE);
        watchAnimation = AnimationUtils.loadAnimation(getActivity(),R.anim.private_message_launcher);
        ivWatchMovie.startAnimation(watchAnimation);
        watchAnimation.setAnimationListener(new AnimationListener(){
            @Override
            public void onAnimationStart(Animation animation) {}
            @Override
            public void onAnimationRepeat(Animation animation) {}
            @Override
            public void onAnimationEnd(Animation animation) {
                if(started)
                    thisWeek();
            }
        });
    }

    /**
     * 好啊  这周末有空
     */
    private void thisWeek(){
        ivThisWeek.setVisibility(View.VISIBLE);
        thisWeekAnimation = AnimationUtils.loadAnimation(getActivity(),R.anim.private_message_launcher);
        ivThisWeek.startAnimation(thisWeekAnimation);
    }
}

8.最后一个引导页  就两个动画  图片的放大跟缩小,其实用xml布局的话一个动画就能搞定,跟私信页面的动画差不多.小伙伴写的代码.这里换了一种方式.代码比较多.

/**
 * 最后一个
 * @author apple
 */
public class StereoscopicLauncherFragment extends LauncherBaseFragment implements OnClickListener{
    private static final float ZOOM_MAX = 1.3f;
    private static final  float ZOOM_MIN = 1.0f;

    private ImageView imgView_immediate_experience;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View rooView=inflater.inflate(R.layout.fragment_stereoscopic_launcher, null);
        imgView_immediate_experience=(ImageView) rooView.findViewById(R.id.imgView_immediate_experience);
        imgView_immediate_experience.setOnClickListener(this);
        return rooView;
    }

    public void playHeartbeatAnimation(){
            /**
             * 放大动画
             */
        AnimationSet animationSet = new AnimationSet(true);
        animationSet.addAnimation(new ScaleAnimation(ZOOM_MIN, ZOOM_MAX, ZOOM_MIN, ZOOM_MAX, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,0.5f));
        animationSet.addAnimation(new AlphaAnimation(1.0f, 0.8f));

        animationSet.setDuration(500);
        animationSet.setInterpolator(new AccelerateInterpolator());
        animationSet.setFillAfter(true);

        animationSet.setAnimationListener(new AnimationListener() {
            @Override
            public void onAnimationStart(Animation animation) {
            }

            @Override
            public void onAnimationRepeat(Animation animation) {
            }

            @Override
            public void onAnimationEnd(Animation animation) {
                    /**
                     * 缩小动画
                     */
                AnimationSet animationSet = new AnimationSet(true);
                animationSet.addAnimation(new ScaleAnimation(ZOOM_MAX, ZOOM_MIN, ZOOM_MAX,ZOOM_MIN, Animation.RELATIVE_TO_SELF, 0.5f,Animation.RELATIVE_TO_SELF, 0.5f));
                animationSet.addAnimation(new AlphaAnimation(0.8f, 1.0f));
                animationSet.setDuration(600);
                animationSet.setInterpolator(new DecelerateInterpolator());
                animationSet.setFillAfter(false);
                 // 实现心跳的View
                imgView_immediate_experience.startAnimation(animationSet);
            }
        });
         // 实现心跳的View
        imgView_immediate_experience.startAnimation(animationSet);
    }

    @Override
    public void onClick(View v) {
//      Intent intent = new Intent();
//      intent.setClass(getActivity(),MainActivity.class);
//      startActivity(intent);
//      getActivity().finish();
    }

    @Override
    public void startAnimation() {
        playHeartbeatAnimation();
    }

    @Override
    public void stopAnimation() {

    }
}

最后总结:以上就是三个引导页的核心代码了,还有一些布局文件,动画效果的布局文件我就不一一贴出来的,大家可以去下载我的源码,在这个过程中碰到的几个大的问题说明一下.

1.viewpager切换的时候要结束上个fragment的动画   我是通过boolean变量去控制的

2.背景图片移动的效果    之前自己走了很多弯路,后面在网上找了一个demo拿过来用了.因为大家都有开源精神所以这里省了很多功夫

3.图片放大缩小以前居然不知道一个xml动画布局就能搞定.之前一直想办法用两个动画实现

看看时间一篇博客写了一个半小时,都12点了,办公室一个人敲打着键盘,记录着这两天做过的东西,才发现这也是一件很惬意的事情。。。。闪人。。。回家.
推荐下自己创建的android QQ群:202928390 欢迎大家的加入.

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