Android 사용자 정의 ViewPager 맞 춤 형 이미지 전환 효과 구현

package com.example.zhy_jazzyviewpager; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.view.PagerAdapter; 
import android.view.Menu; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.ImageView.ScaleType; 
 
public class MainActivity extends Activity 
{ 
 protected static final String TAG = "MainActivity"; 
 private int[] mImgIds; 
 private MyJazzyViewPager mViewPager; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) 
 { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 mImgIds = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, 
  R.drawable.d }; 
 mViewPager = (MyJazzyViewPager) findViewById(R.id.id_viewPager); 
 mViewPager.setAdapter(new PagerAdapter() 
 { 
 
  @Override 
  public boolean isViewFromObject(View arg0, Object arg1) 
  { 
  return arg0 == arg1; 
  } 
 
  @Override 
  public void destroyItem(ViewGroup container, int position, 
   Object object) 
  { 
  container.removeView((View) object); 
  } 
 
  @Override 
  public Object instantiateItem(ViewGroup container, int position) 
  { 
  ImageView imageView = new ImageView(MainActivity.this); 
  imageView.setImageResource(mImgIds[position]); 
  imageView.setScaleType(ScaleType.CENTER_CROP); 
  container.addView(imageView); 
  mViewPager.setObjectForPosition(imageView, position); 
  return imageView; 
  } 
 
  @Override 
  public int getCount() 
  { 
  return mImgIds.length; 
  } 
 }); 
 
 } 
 
} 

package com.example.zhy_jazzyviewpager; 
 
import java.util.HashMap; 
import java.util.LinkedHashMap; 
 
import android.content.Context; 
import android.support.v4.view.ViewPager; 
import android.util.AttributeSet; 
import android.util.Log; 
import android.view.View; 
 
import com.nineoldandroids.view.ViewHelper; 
 
public class MyJazzyViewPager extends ViewPager 
{ 
 private float mTrans; 
 private float mScale; 
 /** 
 *         
 */ 
 private static final float SCALE_MAX = 0.5f; 
 private static final String TAG = "MyJazzyViewPager"; 
 /** 
 *   position    View 
 */ 
 private HashMap<Integer, View> mChildrenViews = new LinkedHashMap<Integer, View>(); 
 /** 
 *          
 */ 
 private View mLeft; 
 /** 
 *          
 */ 
 private View mRight; 
 
 public MyJazzyViewPager(Context context, AttributeSet attrs) 
 { 
 super(context, attrs); 
 } 
 
 @Override 
 public void onPageScrolled(int position, float positionOffset, 
  int positionOffsetPixels) 
 { 
 
// Log.e(TAG, "position=" + position+", positionOffset = "+positionOffset+" ,positionOffsetPixels = " + positionOffsetPixels+" , currentPos = " + getCurrentItem()); 
  
 //         ，       ，        
 float effectOffset = isSmall(positionOffset) ? 0 : positionOffset; 
  
 //     View 
 mLeft = findViewFromObject(position); 
 //     View 
 mRight = findViewFromObject(position + 1); 
  
 //          
 animateStack(mLeft, mRight, effectOffset, positionOffsetPixels); 
 super.onPageScrolled(position, positionOffset, positionOffsetPixels); 
 } 
 
 public void setObjectForPosition(View view, int position) 
 { 
 mChildrenViews.put(position, view); 
 } 
 
 /** 
 *           View 
 * 
 * @param position 
 * @return 
 */ 
 public View findViewFromObject(int position) 
 { 
 return mChildrenViews.get(position); 
 } 
 
 private boolean isSmall(float positionOffset) 
 { 
 return Math.abs(positionOffset) < 0.0001; 
 } 
 
 protected void animateStack(View left, View right, float effectOffset, 
  int positionOffsetPixels) 
 { 
 if (right != null) 
 { 
  /** 
  *                 （      ）：0.0~1.0，        
  *            （      ）：1.0~0，        
  */ 
  mScale = (1 - SCALE_MAX) * effectOffset + SCALE_MAX; 
  /** 
  * x   ：            （      ）：0-720            （      ）：720-0 
  */ 
  mTrans = -getWidth() - getPageMargin() + positionOffsetPixels; 
  ViewHelper.setScaleX(right, mScale); 
  ViewHelper.setScaleY(right, mScale); 
  ViewHelper.setTranslationX(right, mTrans); 
 } 
 if (left != null) 
 { 
  left.bringToFront(); 
 } 
 } 
} 

<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.zhy_jazzyviewpager.MyJazzyViewPager 
 android:layout_width="wrap_content" 
 android:layout_height="wrap_content" 
 android:id="@+id/id_viewPager" /> 
 
</RelativeLayout> 

package com.jfeinstein.jazzyviewpager; 
 
import com.jfeinstein.jazzyviewpager.JazzyViewPager.TransitionEffect; 
 
import android.app.Activity; 
import android.os.Bundle; 
import android.support.v4.view.PagerAdapter; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 
import android.widget.ImageView.ScaleType; 
 
public class MainActivity extends Activity 
{ 
 protected static final String TAG = "MainActivity"; 
 private int[] mImgIds; 
 private JazzyViewPager mViewPager; 
 
 @Override 
 protected void onCreate(Bundle savedInstanceState) 
 { 
 super.onCreate(savedInstanceState); 
 setContentView(R.layout.activity_main); 
 mImgIds = new int[] { R.drawable.a, R.drawable.b, R.drawable.c, 
  R.drawable.d }; 
 mViewPager = (JazzyViewPager) findViewById(R.id.id_viewPager); 
 //       
 mViewPager.setTransitionEffect(TransitionEffect.Stack); 
  
  
 mViewPager.setAdapter(new PagerAdapter() 
 { 
 
  @Override 
  public boolean isViewFromObject(View arg0, Object arg1) 
  { 
  return arg0 == arg1; 
  } 
 
  @Override 
  public void destroyItem(ViewGroup container, int position, 
   Object object) 
  { 
  container.removeView((View) object); 
  } 
 
  @Override 
  public Object instantiateItem(ViewGroup container, int position) 
  { 
  ImageView imageView = new ImageView(MainActivity.this); 
  imageView.setImageResource(mImgIds[position]); 
  imageView.setScaleType(ScaleType.CENTER_CROP); 
  container.addView(imageView); 
  mViewPager.setObjectForPosition(imageView, position); 
  return imageView; 
  } 
 
  @Override 
  public int getCount() 
  { 
  return mImgIds.length; 
  } 
 }); 
 
 } 
 
}