[置顶] 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"/>
    	
	   </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);
               }
           }
       }
   }