android 引导界面的设计

最近在研究如何做出仿微信，仿新浪等应用，第一次安装使用的使用展示应用程序的新特性和用法。

实现功能：左右手势滑屏

    底部小圆点随当前显示页跳动

    浮动按钮显示。当触屏事件发生显示，否则就渐渐消失

第一种： ViewFlipper + GestureDetector

第二种： ActivityGroup +   GestureDetector

第三种： ViewPager  (Android3.0+)

第四种： ViewFlow (开源项目)

话不多说，先放上效果图

向右滑动，或者点击按钮向右

怎么样，是不是很心动~~~！哈哈、

实现左右滑屏是需要一个叫做ViewPager的东西。具体ViewPager怎么用我就不赘述了。（PS注意导入ViewPager的兼容包)

接下来是代码：

首先在main.xml中声明ViewPager：

 <LinearLayout
    android:id="@+id/linearLayout01"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >
 <android.support.v4.view.ViewPager
     android:id="@+id/guidePages"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"/>

 lt;/LinearLayout>

 <LinearLayout
    android:id="@+id/linearLayout01"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >
 <android.support.v4.view.ViewPager
     android:id="@+id/guidePages"
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"/>

 lt;/LinearLayout>

 和一个viewGroup放小圆点

 和一个viewGroup放小圆点

 <LinearLayout
     android:id="@+id/viewGroup"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignParentBottom="true"
     android:layout_marginBottom="40dp"
     android:gravity="center_horizontal"
     android:orientation="horizontal" >

 </LinearLayout>

 <LinearLayout
     android:id="@+id/viewGroup"
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:layout_alignParentBottom="true"
     android:layout_marginBottom="40dp"
     android:gravity="center_horizontal"
     android:orientation="horizontal" >

 </LinearLayout>

接着在item01.xml等几个xml中放置要显示的图片,因为几个都一样，就不都贴上来了。

 <ImageView
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="@drawable/feature_guide_0" >

 </ImageView>

 <ImageView
     android:layout_width="fill_parent"
     android:layout_height="fill_parent"
     android:background="@drawable/feature_guide_0" >

 </ImageView>

接下来是核心代码：

 public class GuideViewActivity extends Activity {


     private ViewPager viewPager;
      private ArrayList<View> pageViews;
      private ImageView imageView;
      private ImageView[] imageViews;
     // 包裹滑动图片LinearLayout
      private ViewGroup main;
     // 包裹小圆点的LinearLayout
      private ViewGroup group;
      //左箭头按钮
      private ImageView imageViewLeft;
      //右箭头按钮
      private ImageView imageViewRight;
      //当前页码
      private int currentIndex;

      //ImageView的alpha值
      private int mAlpha = 0;
      private boolean isHide;


     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         //将要显示的图片放到ArrayList当中，存到适配器中
         LayoutInflater inflater = getLayoutInflater();
         pageViews = new ArrayList<View>();
         pageViews.add(inflater.inflate(R.layout.item01, null));

 public class GuideViewActivity extends Activity {


     private ViewPager viewPager;
      private ArrayList<View> pageViews;
      private ImageView imageView;
      private ImageView[] imageViews;
     // 包裹滑动图片LinearLayout
      private ViewGroup main;
     // 包裹小圆点的LinearLayout
      private ViewGroup group;
      //左箭头按钮
      private ImageView imageViewLeft;
      //右箭头按钮
      private ImageView imageViewRight;
      //当前页码
      private int currentIndex;

      //ImageView的alpha值
      private int mAlpha = 0;
      private boolean isHide;


     /** Called when the activity is first created. */
     @Override
     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         //将要显示的图片放到ArrayList当中，存到适配器中
         LayoutInflater inflater = getLayoutInflater();
         pageViews = new ArrayList<View>();
         pageViews.add(inflater.inflate(R.layout.item01, null));

 ...

 ...

        imageViews = new ImageView[pageViews.size()];
        main = (ViewGroup)inflater.inflate(R.layout.main, null);

        group = (ViewGroup)main.findViewById(R.id.viewGroup);
        viewPager = (ViewPager)main.findViewById(R.id.guidePages);
        imageViewLeft = (ImageView)main.findViewById(R.id.imageView1);
        imageViewRight = (ImageView)main.findViewById(R.id.imageView2);
        imageViewLeft.setAlpha(0);
        imageViewRight.setAlpha(0);

        //将小圆点放到imageView数组当中
        for (int i = 0; i < pageViews.size(); i++) {
            imageView = new ImageView(GuideViewActivity.this);
            imageView.setLayoutParams(new LayoutParams(20,20));
            imageView.setPadding(20, 0, 20, 0);
            imageViews[i] = imageView;

            if (i == 0) {
             //默认选中第一张图片
                imageViews[i].setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                imageViews[i].setBackgroundResource(R.drawable.page_indicator);
            }

            group.addView(imageViews[i]);
        }

        setContentView(main);

        viewPager.setAdapter(new GuidePageAdapter());
        viewPager.setOnPageChangeListener(new GuidePageChangeListener());
        imageViewLeft.setOnClickListener(new ButtonListener());
        imageViewRight.setOnClickListener(new ButtonListener());
    }

    //左右切换屏幕的按钮监听器
    class ButtonListener implements OnClickListener{

     @Override
     public void onClick(View v) {
         // TODO Auto-generated method stub
         int showNext=0;
         if(v.getId() == R.id.imageView1) {
             System.out.println("点击了向左的按钮");
             if(currentIndex ==0 )
                 showNext = currentIndex;
             else
                 showNext = currentIndex-1;
             viewPager.setCurrentItem(showNext);
         }
         if(v.getId() == R.id.imageView2){
             System.out.println("点击了向右的按钮");
             if(currentIndex == imageViews.length)
                 showNext = currentIndex;
             else
                 showNext = currentIndex+1;
             viewPager.setCurrentItem(showNext);
         }
             System.out.println("当前页码："+showNext);

     }

    }

    /**
     * 设置按钮渐显效果
     */
    private Handler mHandler = new Handler()
    {
        public void handleMessage(Message msg) {
            if(msg.what==1 && mAlpha<255){
                //通过设置不透明度设置按钮的渐显效果
                mAlpha += 50;

                if(mAlpha>255)
                    mAlpha=255;

                imageViewLeft.setAlpha(mAlpha);
                imageViewLeft.invalidate();
                imageViewRight.setAlpha(mAlpha);
                imageViewRight.invalidate();

                if(!isHide && mAlpha<255)
                    mHandler.sendEmptyMessageDelayed(1, 100);
            }else if(msg.what==0 && mAlpha>0){
                mAlpha -= 3;

                if(mAlpha<0)
                    mAlpha=0;
                imageViewLeft.setAlpha(mAlpha);
                imageViewLeft.invalidate();
                imageViewRight.setAlpha(mAlpha);
                imageViewRight.invalidate();

                if(isHide && mAlpha>0)
                    mHandler.sendEmptyMessageDelayed(0, 2);
            }
        }
    };

    private void showImageButtonView(){
        isHide = false;
        mHandler.sendEmptyMessage(1);
    }

    private void hideImageButtonView(){
        new Thread(){
            public void run() {
                try {
                    isHide = true;
                    mHandler.sendEmptyMessage(0);
                } catch (Exception e) {
                    ;
                }
            }
        }.start();
    }





 @Override
 public boolean dispatchTouchEvent(MotionEvent ev) {
     System.out.println("this is dispatch");
     System.out.println("触碰屏幕");
        switch (ev.getAction()) {
            case MotionEvent.ACTION_MOVE:
            case MotionEvent.ACTION_DOWN:
                showImageButtonView();
                break;
            case MotionEvent.ACTION_UP:
                hideImageButtonView();
                break;
        }


     return super.dispatchTouchEvent(ev);
 }

 // 指引页面数据适配器,实现适配器方法
    class GuidePageAdapter extends PagerAdapter {

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

        @Override
        public boolean isViewFromObject(View arg0, Object arg1) {
            return arg0 == arg1;
        }

        @Override
        public int getItemPosition(Object object) {
            // TODO Auto-generated method stub
            return super.getItemPosition(object);
        }

        @Override
        public void destroyItem(View arg0, int arg1, Object arg2) {
            // TODO Auto-generated method stub
            ((ViewPager) arg0).removeView(pageViews.get(arg1));
        }

        @Override
        public Object instantiateItem(View arg0, int arg1) {
            // TODO Auto-generated method stub
            ((ViewPager) arg0).addView(pageViews.get(arg1));
            return pageViews.get(arg1);
        }

        @Override
        public void restoreState(Parcelable arg0, ClassLoader arg1) {
            // TODO Auto-generated method stub

        }

        @Override
        public Parcelable saveState() {
            // TODO Auto-generated method stub
            return null;
        }

        @Override
        public void startUpdate(View arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void finishUpdate(View arg0) {
            // TODO Auto-generated method stub

        }
    }

 // 指引页面更改事件监听器,左右滑动图片时候，小圆点变换显示当前图片位置
    class GuidePageChangeListener implements OnPageChangeListener {

        @Override
        public void onPageScrollStateChanged(int arg0) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onPageScrolled(int arg0, float arg1, int arg2) {
            // TODO Auto-generated method stub

        }

        @Override
        public void onPageSelected(int arg0) {
         currentIndex = arg0;
            for (int i = 0; i < imageViews.length; i++) {
                imageViews[arg0].setBackgroundResource(R.drawable.page_indicator_focused);

                if (arg0 != i) {
                    imageViews[i].setBackgroundResource(R.drawable.page_indicator);
                }
            }
        }
    }