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高仿launcher和墨迹左右拖动效果 (自定义的View)

2013年08月16日 ⁄ 综合 ⁄ 共 13601字 ⁄ 字号 评论关闭

半个月前就有这样的想法,做出一个模仿launcher的效果。自己也曾从网上搜过很多资料,也思考过怎么实现,最终还是参考了别人的资料实现了此效果,也解决了我这半个多月的冥思苦想,再次感谢,今天把代码贴出来供大家学习,因为这方面做得比较好的资料缺失比较少(因为本人搜了很多资料都不能达到效果),如果大家觉得还不错,请顶起。

       

            首先自定义一个 ViewGroup:

 

  1. public class MyScrollLayout extends ViewGroup{  
  2.   
  3.     private VelocityTracker mVelocityTracker;           // 用于判断甩动手势      
  4.     private static final int SNAP_VELOCITY = 600;          
  5.     private Scroller  mScroller;                        // 滑动控制器      
  6.     private int mCurScreen;                               
  7.     private int mDefaultScreen = 0;                            
  8.     private float mLastMotionX;         
  9.  //   private int mTouchSlop;                             
  10.       
  11.    private OnViewChangeListener mOnViewChangeListener;    
  12.    
  13.     public MyScrollLayout(Context context) {  
  14.         super(context);  
  15.         // TODO Auto-generated constructor stub  
  16.         init(context);  
  17.     }     
  18.     public MyScrollLayout(Context context, AttributeSet attrs) {  
  19.         super(context, attrs);  
  20.         // TODO Auto-generated constructor stub  
  21.         init(context);  
  22.     }  
  23.       
  24.     public MyScrollLayout(Context context, AttributeSet attrs, int defStyle) {  
  25.         super(context, attrs, defStyle);  
  26.         // TODO Auto-generated constructor stub       
  27.         init(context);  
  28.     }  
  29.       
  30.     private void init(Context context)  
  31.     {  
  32.         mCurScreen = mDefaultScreen;            
  33.      //   mTouchSlop = ViewConfiguration.get(getContext()).getScaledTouchSlop();                  
  34.         mScroller = new Scroller(context);   
  35.           
  36.     }  
  37.   
  38.     @Override  
  39.     protected void onLayout(boolean changed, int l, int t, int r, int b) {  
  40.         // TODO Auto-generated method stub        
  41.          if (changed) {      
  42.                 int childLeft = 0;      
  43.                 final int childCount = getChildCount();                       
  44.                 for (int i=0; i<childCount; i++) {      
  45.                     final View childView = getChildAt(i);      
  46.                     if (childView.getVisibility() != View.GONE) {      
  47.                         final int childWidth = childView.getMeasuredWidth();      
  48.                         childView.layout(childLeft, 0,       
  49.                                 childLeft+childWidth, childView.getMeasuredHeight());      
  50.                         childLeft += childWidth;      
  51.                     }      
  52.                 }      
  53.             }      
  54.     }  
  55.   
  56.     @Override  
  57.     protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
  58.         // TODO Auto-generated method stub  
  59.         super.onMeasure(widthMeasureSpec, heightMeasureSpec);         
  60.         final int width = MeasureSpec.getSize(widthMeasureSpec);         
  61.         final int widthMode = MeasureSpec.getMode(widthMeasureSpec);        
  62.                   
  63.         final int count = getChildCount();         
  64.         for (int i = 0; i < count; i++) {         
  65.             getChildAt(i).measure(widthMeasureSpec, heightMeasureSpec);         
  66.         }                  
  67.         scrollTo(mCurScreen * width, 0);          
  68.     }  
  69.   
  70.      public void snapToDestination() {      
  71.             final int screenWidth = getWidth();      
  72.             final int destScreen = (getScrollX()+ screenWidth/2)/screenWidth;      
  73.             snapToScreen(destScreen);      
  74.      }    
  75.       
  76.      public void snapToScreen(int whichScreen) {          
  77.             // get the valid layout page      
  78.             whichScreen = Math.max(0, Math.min(whichScreen, getChildCount()-1));      
  79.             if (getScrollX() != (whichScreen*getWidth())) {                       
  80.                 final int delta = whichScreen*getWidth()-getScrollX();      
  81.                         mScroller.startScroll(getScrollX(), 0,       
  82.                         delta, 0, Math.abs(delta)*2);  
  83.                   
  84.                 mCurScreen = whichScreen;      
  85.                 invalidate();       // Redraw the layout                      
  86.                 if (mOnViewChangeListener != null)  
  87.                 {  
  88.                     mOnViewChangeListener.OnViewChange(mCurScreen);  
  89.                 }  
  90.             }      
  91.         }      
  92.   
  93.     @Override  
  94.     public void computeScroll() {  
  95.         // TODO Auto-generated method stub  
  96.         if (mScroller.computeScrollOffset()) {      
  97.             scrollTo(mScroller.getCurrX(), mScroller.getCurrY());    
  98.             postInvalidate();      
  99.         }     
  100.     }  
  101.   
  102.     @Override  
  103.     public boolean onTouchEvent(MotionEvent event) {  
  104.         // TODO Auto-generated method stub                            
  105.             final int action = event.getAction();      
  106.             final float x = event.getX();      
  107.             final float y = event.getY();      
  108.                   
  109.             switch (action) {      
  110.             case MotionEvent.ACTION_DOWN:                 
  111.                   Log.i("", "onTouchEvent  ACTION_DOWN");                   
  112.                 if (mVelocityTracker == null) {      
  113.                         mVelocityTracker = VelocityTracker.obtain();      
  114.                         mVelocityTracker.addMovement(event);   
  115.                 }              
  116.                 if (!mScroller.isFinished()){      
  117.                     mScroller.abortAnimation();      
  118.                 }                  
  119.                 mLastMotionX = x;                
  120.                 break;      
  121.                       
  122.             case MotionEvent.ACTION_MOVE:    
  123.                int deltaX = (int)(mLastMotionX - x);                 
  124.                if (IsCanMove(deltaX))  
  125.                {  
  126.                  if (mVelocityTracker != null)  
  127.                  {  
  128.                         mVelocityTracker.addMovement(event);   
  129.                  }     
  130.                 mLastMotionX = x;       
  131.                 scrollBy(deltaX, 0);      
  132.                }  
  133.            
  134.                break;                         
  135.             case MotionEvent.ACTION_UP:                       
  136.                 int velocityX = 0;  
  137.                 if (mVelocityTracker != null)  
  138.                 {  
  139.                     mVelocityTracker.addMovement(event);   
  140.                     mVelocityTracker.computeCurrentVelocity(1000);    
  141.                     velocityX = (int) mVelocityTracker.getXVelocity();  
  142.                 }                                     
  143.                 if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {         
  144.                     // Fling enough to move left            
  145.                     snapToScreen(mCurScreen - 1);         
  146.                 } else if (velocityX < -SNAP_VELOCITY         
  147.                         && mCurScreen < getChildCount() - 1) {         
  148.                     // Fling enough to move right            
  149.                     snapToScreen(mCurScreen + 1);         
  150.                 } else {         
  151.                     snapToDestination();         
  152.                 }        
  153.                                   
  154.                 if (mVelocityTracker != null) {         
  155.                     mVelocityTracker.recycle();         
  156.                     mVelocityTracker = null;         
  157.                 }         
  158.           //      mTouchState = TOUCH_STATE_REST;  
  159.                 break;        
  160.             }                     
  161.             return true;      
  162.     }  
  163.   
  164.     private boolean IsCanMove(int deltaX)  
  165.     {  
  166.         if (getScrollX() <= 0 && deltaX < 0 ){  
  167.             return false;  
  168.         }     
  169.         if  (getScrollX() >=  (getChildCount() - 1) * getWidth() && deltaX > 0){  
  170.             return false;  
  171.         }         
  172.         return true;  
  173.     }  
  174.       
  175.     public void SetOnViewChangeListener(OnViewChangeListener listener)  
  176.     {  
  177.         mOnViewChangeListener = listener;  
  178.     }  
  179. }  

  1. public class SwitchViewDemoActivity extends Activity implements OnViewChangeListener, OnClickListener{  
  2.     /** Called when the activity is first created. */  
  3.   
  4.     private MyScrollLayout mScrollLayout;     
  5.     private ImageView[] mImageViews;      
  6.     private int mViewCount;   
  7.     private int mCurSel;  
  8.       
  9.     @Override  
  10.     public void onCreate(Bundle savedInstanceState) {  
  11.         super.onCreate(savedInstanceState);  
  12.         setContentView(R.layout.main);          
  13.         init();  
  14.           
  15.     }  
  16.       
  17.     private void init()  
  18.     {  
  19.         mScrollLayout = (MyScrollLayout) findViewById(R.id.ScrollLayout);     
  20.         LinearLayout linearLayout = (LinearLayout) findViewById(R.id.llayout);  
  21.         //动态添加一个layout控件  
  22.         LinearLayout layout=new LinearLayout(this);  
  23.         layout.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT));  
  24.         layout.setBackgroundResource(R.drawable.guide01);  
  25.         mScrollLayout.addView(layout);  
  26.         //动态添加一个imageView控件          
  27.         ImageView imageView=new ImageView(this);  
  28.         imageView.setLayoutParams(new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));  
  29.         imageView.setPadding(15, 15, 15, 15);  
  30.         imageView.setImageResource(R.drawable.guide_round);  
  31.         linearLayout.addView(imageView);  
  32.           
  33.         mViewCount = mScrollLayout.getChildCount();  
  34.         mImageViews = new ImageView[mViewCount];      
  35.         for(int i = 0; i < mViewCount; i++)      {  
  36.             mImageViews[i] = (ImageView) linearLayout.getChildAt(i);  
  37.             mImageViews[i].setEnabled(true);  
  38.             mImageViews[i].setOnClickListener(this);  
  39.             mImageViews[i].setTag(i);  
  40.         }         
  41.         mCurSel = 0;  
  42.         mImageViews[mCurSel].setEnabled(false);       
  43.         mScrollLayout.SetOnViewChangeListener(this);  
  44.           
  45.     }  
  46.   
  47.     private void setCurPoint(int index)  
  48.     {  
  49.         if (index < 0 || index > mViewCount - 1 || mCurSel == index)      {  
  50.             return ;  
  51.         }         
  52.         mImageViews[mCurSel].setEnabled(true);  
  53.         mImageViews[index].setEnabled(false);         
  54.         mCurSel = index;  
  55.     }  
  56.   
  57.     @Override  
  58.     public void OnViewChange(int view) {  
  59.         // TODO Auto-generated method stub  
  60.         setCurPoint(view);  
  61.     }  
  62.   
  63.     @Override  
  64.     public void onClick(View v) {  
  65.         // TODO Auto-generated method stub  
  66.         int pos = (Integer)(v.getTag());  
  67.         setCurPoint(pos);  
  68.         mScrollLayout.snapToScreen(pos);  
  69.     }  
  70. }  

最后是布局文件 :

  1. <?xml version="1.0" encoding="utf-8"?>  
  2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
  3.     android:layout_width="fill_parent"  
  4.     android:layout_height="fill_parent" >  
  5.   
  6.     <cn.com.karl.scroll.MyScrollLayout  
  7.         xmlns:android="http://schemas.android.com/apk/res/android"  
  8.         android:id="@+id/ScrollLayout"  
  9.         android:layout_width="fill_parent"  
  10.         android:layout_height="fill_parent" >  
  11.   
  12.         <LinearLayout  
  13.             android:layout_width="fill_parent"  
  14.             android:layout_height="fill_parent"  
  15.             android:background="@drawable/guide01" >  
  16.         </LinearLayout>  
  17.   
  18.         <LinearLayout  
  19.             android:layout_width="fill_parent"  
  20.             android:layout_height="fill_parent"  
  21.             android:background="@drawable/guide02" >  
  22.         </LinearLayout>  
  23.   
  24.         <LinearLayout  
  25.             android:layout_width="fill_parent"  
  26.             android:layout_height="fill_parent"  
  27.             android:background="@drawable/guide03" >  
  28.         </LinearLayout>  
  29.   
  30.         <LinearLayout  
  31.             android:layout_width="fill_parent"  
  32.             android:layout_height="fill_parent"  
  33.             android:background="@drawable/guide04" >  
  34.         </LinearLayout>  
  35.   
  36.         <LinearLayout  
  37.             android:layout_width="fill_parent"  
  38.             android:layout_height="fill_parent"  
  39.             android:background="@drawable/guide05" >  
  40.         </LinearLayout>  
  41.     </cn.com.karl.scroll.MyScrollLayout>  
  42.   
  43.     <LinearLayout  
  44.         android:id="@+id/llayout"  
  45.         android:layout_width="wrap_content"  
  46.         android:layout_height="wrap_content"  
  47.         android:layout_alignParentBottom="true"  
  48.         android:layout_centerHorizontal="true"  
  49.         android:layout_marginBottom="24.0dip"  
  50.         android:orientation="horizontal" >  
  51.   
  52.         <ImageView  
  53.             android:layout_width="wrap_content"  
  54.             android:layout_height="wrap_content"  
  55.             android:layout_gravity="center_vertical"  
  56.             android:clickable="true"  
  57.             android:padding="15.0dip"  
  58.             android:src="@drawable/guide_round" />  
  59.   
  60.         <ImageView  
  61.             android:layout_width="wrap_content"  
  62.             android:layout_height="wrap_content"  
  63.             android:layout_gravity="center_vertical"  
  64.             android:clickable="true"  
  65.             android:padding="15.0dip"  
  66.             android:src="@drawable/guide_round" />  
  67.   
  68.         <ImageView  
  69.             android:layout_width="wrap_content"  
  70.             android:layout_height="wrap_content"  
  71.             android:layout_gravity="center_vertical"  
  72.             android:clickable="true"  
  73.             android:padding="15.0dip"  
  74.             android:src="@drawable/guide_round" />  
  75.   
  76.         <ImageView  
  77.             android:layout_width="wrap_content"  
  78.             android:layout_height="wrap_content"  
  79.             android:layout_gravity="center_vertical"  
  80.             android:clickable="true"  
  81.             android:padding="15.0dip"  
  82.             android:src="@drawable/guide_round" />  
  83.   
  84.         <ImageView  
  85.             android:layout_width="wrap_content"  
  86.             android:layout_height="wrap_content"  
  87.             android:layout_gravity="center_vertical"  
  88.             android:clickable="true"  
  89.             android:padding="15.0dip"  
  90.             android:src="@drawable/guide_round" />  
  91.     </LinearLayout>  
  92.   
  93. </RelativeLayout>  

看看运行后的效果到底怎么样吧!

转自http://blog.csdn.net/wangkuifeng0118/article/details/7374460

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