android的ViewPager和Animation的一些使用(一)

android的ViewPager是一个可以支持手势来切换View的控件,很适合来做用户引导的页面:

如果有4张图,那么我们这样来写Layout:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/whats_new_main_view"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="#FFFFFF" >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="60dp"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/tab_name"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:gravity="center"
            android:text="第一页"
            android:textColor="#000000"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tab_name1"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:gravity="center"
            android:text="第二页"
            android:textColor="#000000"
            android:textSize="14sp" />

        <TextView
            android:id="@+id/tab_name2"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:gravity="center"
            android:text="第三页"
            android:textColor="#000000"
            android:textSize="14sp" />
       
        <TextView
            android:id="@+id/tab_name3"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:layout_weight="1"
            android:gravity="center"
            android:text="第四页"
            android:textColor="#000000"
            android:textSize="14sp" />
    </LinearLayout>
    <!-- img为蓝色的滑块
     -->
      <ImageView 
        android:id="@+id/img"
        android:layout_width="@dimen/image_width"
        android:layout_height="4dp"
        android:background="#0A84BD"
       />

     <android.support.v4.view.ViewPager
        android:id="@+id/vPager"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        android:layout_gravity="center"
        android:layout_weight="1.0"
        android:background="#000000"
        android:flipInterval="30"
        android:persistentDrawingCache="animation" />
</LinearLayout>

做init工作:

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.pager_layout);
		mImageWidth = this.getResources().getDimensionPixelSize(R.dimen.image_width);
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		int screenW = dm.widthPixels;
		//offset为img的初始位置
		offset = (screenW / 4 - mImageWidth) / 2;
		
		img = (ImageView)findViewById(R.id.img);
		LayoutParams layout = (LayoutParams) img.getLayoutParams();
		layout.leftMargin = offset;
		
		InitViewPager();
		initAnimationForEachView(0);
	}

	private void InitViewPager() {
		viewPager=(ViewPager) findViewById(R.id.vPager);
		views=new ArrayList<View>();
		LayoutInflater inflater=getLayoutInflater();
		view1=inflater.inflate(R.layout.layout_tutorial_1, null);
		view2=inflater.inflate(R.layout.layout_tutorial_2, null);
		view3=inflater.inflate(R.layout.layout_tutorial_3, null);
		view4=inflater.inflate(R.layout.layout_tutorial_4, null);
		views.add(view1);
		views.add(view2);
		views.add(view3);
		views.add(view4);
		viewPager.setAdapter(new MyViewPagerAdapter(views));
		viewPager.setCurrentItem(0);
		viewPager.setOnPageChangeListener(new MyOnPageChangeListener());
		InitOther();
	}
	
	private void InitOther() {
		textView1 = (TextView) findViewById(R.id.tab_name);
		textView2 = (TextView) findViewById(R.id.tab_name1);
		textView3 = (TextView) findViewById(R.id.tab_name2);
		textView4 =  (TextView) findViewById(R.id.tab_name3);

		textView1.setOnClickListener(new MyOnClickListener(0));
		textView2.setOnClickListener(new MyOnClickListener(1));
		textView3.setOnClickListener(new MyOnClickListener(2));
		textView4.setOnClickListener(new MyOnClickListener(3));
		
		t1_fixed = (ImageView)view1.findViewById(R.id.t1_fixed);
	    t1_icon1 = (ImageView)view1.findViewById(R.id.t1_icon1);
	    t1_icon2 = (ImageView)view1.findViewById(R.id.t1_icon2);
	    t1_next = (ImageView)view1.findViewById(R.id.t1_next);
	  
	    t2_fixed = (ImageView)view2.findViewById(R.id.t2_fixed);
	    t2_icon1 = (ImageView)view2.findViewById(R.id.t2_icon1);
	    t2_next = (ImageView)view2.findViewById(R.id.t2_next);
	    
	    t3_fixed = (ImageView)view3.findViewById(R.id.t3_fixed);
	    t3_next = (ImageView)view3.findViewById(R.id.t3_next);
	    center_layout_3 = (RelativeLayout)view3.findViewById(R.id.center_layout_3);
	    t3_icon6 = (ImageView)view3.findViewById(R.id.t3_icon6);
	    
	    t4_fixed = (ImageView)view4.findViewById(R.id.t4_fixed);
	    t4_icon1 = (ImageView)view4.findViewById(R.id.t4_icon1);
	}

	private class MyOnClickListener implements OnClickListener{
        private int index=0;
        public MyOnClickListener(int i){
        	index=i;
        }
		public void onClick(View v) {
			viewPager.setCurrentItem(index);			
		}
		
	}
	
	public class MyViewPagerAdapter extends PagerAdapter{
		private List<View> mListViews;
		
		public MyViewPagerAdapter(List<View> mListViews) {
			this.mListViews = mListViews;
		}

		@Override
		public void destroyItem(ViewGroup container, int position, Object object) 	{	
			container.removeView(mListViews.get(position));
		}


		@Override
		public Object instantiateItem(ViewGroup container, int position) {			
			 container.addView(mListViews.get(position), 0);
			 return mListViews.get(position);
		}

		@Override
		public int getCount() {			
			return  mListViews.size();
		}
		
		@Override
		public boolean isViewFromObject(View arg0, Object arg1) {			
			return arg0==arg1;
		}
	}

    public class MyOnPageChangeListener implements OnPageChangeListener{

    	int one = offset * 2 + mImageWidth;
		int two = one * 2;
		public void onPageScrollStateChanged(int arg0) {
			
		}

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

		public void onPageSelected(final int arg0) {
			Animation animation = new TranslateAnimation(one * currIndex, one * arg0, 0, 0);// 显然这个比较简洁，只有一行代码。
			currIndex = arg0;
			animation.setFillAfter(true);// True:图片停在动画结束位置
			animation.setDuration(300);
			img.startAnimation(animation);
			initAnimationForEachView(arg0);
			
		}
    	
    }

动画部分第二篇来讲,效果图如下:

代码可以在http://download.csdn.net/detail/baidu_nod/7636351下载

android的ViewPager和Animation的一些使用(一),,5-wow.com