기본적인 안드로이드 바탕화면 드래그엔드롭 화면전환 
@visualkhh
퍼가실땐^^꼭.ㅎㅎ출처를.ㅎ

device.png
package com.kdtandroid.view;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.widget.FrameLayout;
import android.widget.HorizontalScrollView;
import android.widget.LinearLayout;
/*
 * visualkhh@gmail.com
 * @visualkhh
 * 김현하
 */
public class CustomFlipper extends FrameLayout {

final private double accelerationDelay_mm=120;
private Handler handle =new Handler();
private LinearLayout navigation_container = null;
private LinearLayout container = null;
private HorizontalScrollView content_horizontal_container = null;
private LinearLayout content_item_container = null;
private Context context = null;
private static int index=0;
public CustomFlipper(Context context) {
super(context);
this.context = context;
init();
}

public CustomFlipper(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
init();
}
public CustomFlipper(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.context = context;
init();
}

private void init() {
content_horizontal_container = new HorizontalScrollView(context);
content_horizontal_container.setHorizontalFadingEdgeEnabled(false);
// content_horizontal_container.setHorizontalScrollBarEnabled(false);
content_horizontal_container.setLayoutParams(new ViewGroup.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT));
// content_horizontal_container.setBackgroundColor(0xFFFF0000);
content_item_container = new LinearLayout(this.context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT, 0.0F);
params.leftMargin  = 0;
params.rightMargin = 0;
params.topMargin = 0;
params.bottomMargin = 0;
// params.gravity = gravity;
content_item_container.setLayoutParams(params);
content_item_container.setGravity(Gravity.CENTER);
content_item_container.setOrientation(LinearLayout.HORIZONTAL);
//**************
container = new LinearLayout(this.context);
LinearLayout.LayoutParams params_container = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT, 0.0F);
params_container.leftMargin  = 0;
params_container.rightMargin = 0;
params_container.topMargin = 0;
params_container.bottomMargin = 0;
// params.gravity = gravity;
container.setLayoutParams(params_container);
container.setGravity(Gravity.CENTER);
container.setOrientation(LinearLayout.HORIZONTAL);
//**************
//
container.addView(content_item_container);
//
content_horizontal_container.addView(container);
content_horizontal_container.setOnTouchListener(Listener_touch);
super.addView(content_horizontal_container);
}
@Override
public void addView(View child) {
LinearLayout atContainer = new LinearLayout(this.context);
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
ViewGroup.LayoutParams.FILL_PARENT,
ViewGroup.LayoutParams.FILL_PARENT, 0.0F);
int pading=0;
params.leftMargin  = pading;
params.rightMargin = pading;
params.topMargin = pading;
params.bottomMargin = pading;
// params.gravity = gravity;
atContainer.setLayoutParams(params);
atContainer.setGravity(Gravity.CENTER);
atContainer.setOrientation(LinearLayout.VERTICAL);
atContainer.addView(child);
// atContainer.setBackgroundColor(Color.BLACK);
content_item_container.addView(atContainer);
Log.d("CustomFlipper",getMeasuredWidth()+"  "+getMeasuredHeight());
// super.addView(atContainer);
// super.addView(child);
};
float moveAction_x=0;
float downAction_x=0;
long downTime=0;
long upTime=0;
OnTouchListener Listener_touch = new OnTouchListener(){
public boolean onTouch(View v, MotionEvent event) {
// Log.d("CustomFlipper","onTouchEvent GetAction"+event.getAction());
//
if(event.getAction() == event.ACTION_DOWN){
downTime = System.currentTimeMillis();
downAction_x = event.getX();
moveAction_x = event.getX();
// Log.d("CustomFlipper","onTouchEvent Down"+moveAction_x);
return true;
}
if(event.getAction() == event.ACTION_UP){
upTime = System.currentTimeMillis();
long differenceTime = Math.abs(upTime-downTime);
float differenceValue = downAction_x-event.getX();
int thisIndex = getNeighborIndex();

Log.d("CustomFlipper","onTouchEvent UP");
//차이가없을땐 그냥 인덱   차이있으면 글로가
if(differenceTime<accelerationDelay_mm){
if(differenceValue>0){//++
thisIndex=index;
thisIndex++;
}else if(differenceValue<0){ //--
thisIndex=index;
thisIndex--;
}
}
goIndexPage(thisIndex);
}
if(event.getAction() == event.ACTION_MOVE){
float differenceValue = moveAction_x-event.getX();
moveAction_x =event.getX();
// Log.d("CustomFlipper",moveAction_x+"onTouchEvent MOVE"+event.getX());
setHorizontal_apeend_x(differenceValue);
}
return false;
}

};

public void goIndexPage(int input_index) {
if(input_index<0)
input_index=0;
if(input_index >= getContentChildCount())
input_index=getContentChildCount()-1;
final int index = input_index;
Thread thread =new Thread(){
public void run() {

//가중치
int step=30;
double [] exp = new double[step]; 
double sum=0;
double wi=0.1;
for(int i=0;i<step;i++){
double expval = Math.exp(-(wi*(i+1)));
exp[i]=expval;
sum+=expval;
}
for(int i=0;i<step;i++){
exp[i]=exp[i]/sum;
}
float charwidtg  =   (  index*getMeasuredWidth()  )   -   getHorizontal_x();
for(int i=0;i<step;i++){
final double weight_value = charwidtg*exp[i];
handle.post(new Runnable() {
public void run() {
setHorizontal_apeend_x(weight_value);
// Log.d("CustomFlipper",weight_value+" GoPage GetIndex "+index);
}
});
try {
sleep(5);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
handle.post(new Runnable() {
public void run() {
setHorizontal_absx((  index*getMeasuredWidth()  ) );
int inputIndex = index;
setLastIndex(inputIndex);
}
});
};
};
thread.setDaemon(true);
thread.start();
}
private int getNeighborIndex() {
float at_view_point = getViewCenterPoint(); //지금 사용자가 보고있는 위치    (맨왼쪽+절반사이즈)
float horizontal_child_cnt = getContentChildCount();
int thisIndex=0;
for(int i = 0 ; i <horizontal_child_cnt;i++ ){
float left_x =i*getMeasuredWidth();
float right_x =left_x+getMeasuredWidth();
if(left_x<at_view_point && right_x>at_view_point){
thisIndex=i;
}
}
return thisIndex;
}

private float getViewCenterPoint(){
float halfSize = getMeasuredWidth()/2; //한장의 화면의 절반사이즈
float horizontal_x = getHorizontal_x(); //화면에 맨왼쪽
float at_view_point = horizontal_x+halfSize; //지금 사용자가 보고있는 위치    (맨왼쪽+절반사이즈)
return at_view_point;
}
public int getIndex(){
return this.index;
}
/////////
public void setBackgroundResourceContent(int rsc){
content_item_container.setBackgroundResource(rsc);
}
public void setBackgroundDrawableContent(Drawable draw){
content_item_container.setBackgroundDrawable(draw);
}
public void setBackgroundColorContent(int color){
content_item_container.setBackgroundColor(color);
}
////////
private void setLastIndex(int index){
this.index = index;
}
private float getContentWidth(){
float inner_full_width = getMeasuredWidth()*getContentChildCount(); //전체사이즈
return inner_full_width;
}
private int getContentChildCount(){
return content_item_container.getChildCount();
}
private float getHorizontal_x(){
return content_horizontal_container.getScrollX();
}
private void setHorizontal_absx(int i) {
content_horizontal_container.scrollTo( i, content_horizontal_container.getScrollY());
content_horizontal_container.invalidate();
}
private void setHorizontal_apeend_x(double i) {
// Log.d("CustomFlipper",content_horizontal_container.getScrollX()+"   "+i);
content_horizontal_container.scrollTo((int) ((int)content_horizontal_container.getScrollX()+i), content_horizontal_container.getScrollY());
content_horizontal_container.invalidate();
}


@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
for(int i=0;i<getContentChildCount();i++){
View atChild = content_item_container.getChildAt(i);
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)atChild.getLayoutParams();
params.width=getMeasuredWidth();
params.height=getMeasuredHeight();
atChild.setLayoutParams(params);
// setHorizontal_absx((  getNeighborIndex()*getMeasuredWidth()  ) );
// setMeasuredDimension(widthMeasureSpec,heightMeasureSpec);
}
LinearLayout.LayoutParams params = (LinearLayout.LayoutParams)content_item_container.getLayoutParams();
params.width=(int) getContentWidth();
// params.height=getMeasuredHeight();
content_item_container.setLayoutParams(params);
int getIndex = getIndex();
goIndexPage(getIndex);
// this.width=getMeasuredWidth();
// this.height=getMeasuredHeight();
// Log.d("CustomFlipper","onMeasure");
// Log.d("CustomFlipper",widthMeasureSpec+"  "+heightMeasureSpec+"  ----- "+getMeasuredWidth()+"  "+getMeasuredHeight());
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}

}


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