android实现uc和墨迹天气那样的左右拖动效果.docx
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android实现uc和墨迹天气那样的左右拖动效果
[代码]FlingGalleryActivity
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.content.Context;
importandroid.graphics.Color;
importandroid.util.Log;
importandroid.view.Gravity;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.view.ViewGroup;
importandroid.view.View.OnClickListener;
importandroid.widget.ArrayAdapter;
importandroid.widget.Button;
importandroid.widget.CheckBox;
importandroid.widget.EditText;
importandroid.widget.LinearLayout;
importandroid.widget.TableLayout;
importandroid.widget.TextView;
publicclassFlingGalleryActivityextendsActivity
{
privatefinalintcolor_red=Color.argb（100,200,0,0）;
privatefinalintcolor_green=Color.argb（100,0,200,0）;
privatefinalintcolor_blue=Color.argb（100,0,0,200）;
privatefinalintcolor_yellow=Color.argb（100,200,200,0）;
privatefinalintcolor_purple=Color.argb（100,200,0,200）;
privatefinalString[]mLabelArray={"View1","View2","View3","View4","View5"};
privatefinalint[]mColorArray={color_red,color_green,color_blue,color_yellow,color_purple};
privateFlingGallerymGallery;
privateCheckBoxmCheckBox;
//Note:
Thefollowinghandleriscriticaltocorrectfunctionof
//theFlingGalleryclass.ThisenablestheFlingGalleryclassto
//detectwhenthemotioneventhasendedbyfingerbeinglifted
@Override
publicbooleanonTouchEvent（MotionEventevent）
{
returnmGallery.onGalleryTouchEvent（event）;
}
publicvoidonCreate（BundlesavedInstanceState）
{
super.onCreate（savedInstanceState）;
mGallery=newFlingGallery（this）;
mGallery.setPaddingWidth（5）;
mGallery.setAdapter（newArrayAdapter（getApplicationContext（）,android.R.layout.simple_list_item_1,mLabelArray）
{
@Override
publicViewgetView（intposition,ViewconvertView,ViewGroupparent）
{
Log.d（"111","count="+position）;
//if（convertView!
=null&&convertViewinstanceofGalleryViewItem）
//{
//GalleryViewItemgalleryView=（GalleryViewItem）convertView;
//
//galleryView.mEdit1.setText（""）;
//galleryView.mText1.setText（mLabelArray[position]）;
//galleryView.mText1.setBackgroundColor（mColorArray[position]）;
//galleryView.mText2.setText（mLabelArray[position]）;
//galleryView.mText2.setBackgroundColor（mColorArray[position]）;
//
//Log.d（"111","count="+position）;
//
//returngalleryView;
//
//}
returnnewGalleryViewItem（getApplicationContext（）,position）;
}
}）;
LinearLayoutlayout=newLinearLayout（getApplicationContext（））;
layout.setOrientation（LinearLayout.VERTICAL）;
LinearLayout.LayoutParamslayoutParams=newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT）;
layoutParams.setMargins（10,10,10,10）;
layoutParams.weight=1.0f;
layout.addView（mGallery,layoutParams）;
mCheckBox=newCheckBox（getApplicationContext（））;
mCheckBox.setText（"GalleryisCircular"）;
mCheckBox.setText（"GalleryisCircular"）;
mCheckBox.setPadding（50,10,0,10）;
mCheckBox.setTextSize（30）;
mCheckBox.setChecked（true）;
mCheckBox.setOnClickListener（newOnClickListener（）
{
@Override
publicvoidonClick（Viewview）
{
mGallery.setIsGalleryCircular（mCheckBox.isChecked（））;
}
}）;
layout.addView（mCheckBox,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT））;
setContentView（layout）;
}
privateclassGalleryViewItemextendsTableLayout
{
privateEditTextmEdit1;
privateTextViewmText1;
privateTextViewmText2;
privateButtonmButton1;
privateButtonmButton2;
publicGalleryViewItem（Contextcontext,intposition）
{
super（context）;
this.setOrientation（LinearLayout.VERTICAL）;
this.setLayoutParams（newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT））;
mEdit1=newEditText（context）;
this.addView（mEdit1,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT））;
mText1=newTextView（context）;
mText1.setText（mLabelArray[position]）;
mText1.setTextSize（30）;
mText1.setGravity（Gravity.LEFT）;
mText1.setBackgroundColor（mColorArray[position]）;
this.addView（mText1,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT））;
mButton1=newButton（context）;
mButton1.setText（"<<"）;
mButton1.setGravity（Gravity.LEFT）;
mButton1.setOnClickListener（newOnClickListener（）
{
@Override
publicvoidonClick（Viewview）
{
mGallery.movePrevious（）;
}
}）;
this.addView（mButton1,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT））;
mButton2=newButton（context）;
mButton2.setText（">>"）;
mButton2.setGravity（Gravity.RIGHT）;
mButton2.setOnClickListener（newOnClickListener（）
{
@Override
publicvoidonClick（Viewview）
{
mGallery.moveNext（）;
}
}）;
this.addView（mButton2,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT））;
mText2=newTextView（context）;
mText2.setText（mLabelArray[position]）;
mText2.setTextSize（30）;
mText2.setGravity（Gravity.RIGHT）;
mText2.setBackgroundColor（mColorArray[position]）;
this.addView（mText2,newLinearLayout.LayoutParams（
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT,1））;
}
}
}
[代码]FlingGallery
importandroid.content.Context;
importandroid.view.GestureDetector;
importandroid.view.KeyEvent;
importandroid.view.MotionEvent;
importandroid.view.View;
importandroid.view.animation.Animation;
importandroid.view.animation.AnimationUtils;
importandroid.view.animation.Interpolator;
importandroid.view.animation.Transformation;
importandroid.widget.Adapter;
importandroid.widget.FrameLayout;
importandroid.widget.LinearLayout;
//TODO:
//1.InordertoimproveperformanceCachescreenbitmapanduseforanimation
//2.Establishsuperfluousmemoryallocationsanddelayorreplacewithreusedobjects
//Probablyneedtomakesurewearenotallocatingobjects（strings,etc.）inloops
publicclassFlingGalleryextendsFrameLayout
{
//Constants
privatefinalintswipe_min_distance=120;
privatefinalintswipe_max_off_path=250;
privatefinalintswipe_threshold_veloicty=400;
//Properties
privateintmViewPaddingWidth=0;
privateintmAnimationDuration=250;
privatefloatmSnapBorderRatio=0.5f;
privatebooleanmIsGalleryCircular=true;
//Members
privateintmGalleryWidth=0;
privatebooleanmIsTouched=false;
privatebooleanmIsDragging=false;
privatefloatmCurrentOffset=0.0f;
privatelongmScrollTimestamp=0;
privateintmFlingDirection=0;
privateintmCurrentPosition=0;
privateintmCurrentViewNumber=0;
privateContextmContext;
privateAdaptermAdapter;
privateFlingGalleryView[]mViews;
privateFlingGalleryAnimationmAnimation;
privateGestureDetectormGestureDetector;
privateInterpolatormDecelerateInterpolater;
publicFlingGallery（Contextcontext）
{
super（context）;
mContext=context;
mAdapter=null;
mViews=newFlingGalleryView[3];
mViews[0]=newFlingGalleryView（0,this）;
mViews[1]=newFlingGalleryView（1,this）;
mViews[2]=newFlingGalleryView（2,this）;
mAnimation=newFlingGalleryAnimation（）;
mGestureDetector=newGestureDetector（newFlingGestureDetector（））;
mDecelerateInterpolater=AnimationUtils.loadInterpolator（mContext,android.R.anim.decelerate_interpolator）;
}
publicvoidsetPaddingWidth（intviewPaddingWidth）
{
mViewPaddingWidth=viewPaddingWidth;
}
publicvoidsetAnimationDuration（intanimationDuration）
{
mAnimationDuration=animationDuration;
}
publicvoidsetSnapBorderRatio（floatsnapBorderRatio）
{
mSnapBorderRatio=snapBorderRatio;
}
publicvoidsetIsGalleryCircular（booleanisGalleryCircular）
{
if（mIsGalleryCircular!
=isGalleryCircular）
{
mIsGalleryCircular=isGalleryCircular;
if（mCurrentPosition==getFirstPosition（））
{
//Weneedtoreloadtheviewimmediatelytothelefttochangeittocircularvieworblank
mViews[getPrevViewNumber（mCurrentViewNumber）].recycleView（getPrevPosition（mCurrentPosition））;
}
if（mCurrentPosition==getLastPosition（））
{
//Weneedtoreloadtheviewimmediatelytotherighttochangeittocircularvieworblank
mViews[getNextViewNumber（mCurrentViewNumber）].recycleView（getNextPosition（mCurrentPosition））;
}
}
}
publicintgetGalleryCount（）
{
return（mAdapter==null）?
0:
mAdapter.getCount（）;
}
publicintgetFirstPosition（）
{
return0;
}
publicintgetLastPosition（）
{
return（getGalleryCount（）==0）?
0:
getGalleryCount（）-1;
}
privateintgetPrevPosition（intrelativePosition）
{
intprevPosition=relativePosition-1;
if（prevPosition{
prevPosition=getFirstPosition（）-1;
if（mIsGalleryCircular==true）
{
prevPosition=getLastPosition（）;
}
}
returnprevPosition;
}
privateintgetNextPosition（intrelativePosition）
{
intnextPosition=relativePosition+1;
if（nextPosition>getLastPosition（））
{
nextPosition=getLastPosition（）+1;
if（mIsGalleryCircular==true）
{
nextPosition=getFirstPosition（）;
}
}
returnnextPosition;
}
privateintgetPrevViewNumber（intrelativeViewNumber）
{
return（relativeViewNumber==0）?
2:
relativeViewNumber-1;
}
privateintgetNextViewNumber（intrelativeViewNumber）
{
return
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