import android.app.Activity;
import android.os.Bundle;
import android.content.Context;
import android.graphics.Color;
import android.util.Log;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.TableLayout;
import android.widget.TextView;
public class FlinggalleryActivity extends Activity
{
private final int color_red = Color.argb(100,200,0);
private final int color_green = Color.argb(100,0);
private final int color_blue = Color.argb(100,200);
private final int color_yellow = Color.argb(100,0);
private final int color_purple = Color.argb(100,200);
private final String[] mLabelArray = {"View1","View2","View3","View4","View5"};
private final int[] mColorArray = {color_red,color_green,color_blue,color_yellow,color_purple};
private Flinggallery mgallery;
private CheckBox mCheckBox;
// Note: The following handler is critical to correct function of
// the Flinggallery class. This enables the Flinggallery class to
// detect when the motion event has ended by finger being lifted
@Override
public boolean onTouchEvent(MotionEvent event)
{
return mgallery.ongalleryTouchEvent(event);
}
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
mgallery = new Flinggallery(this);
mgallery.setPaddingWidth(5);
mgallery.setAdapter(new ArrayAdapter<String>(getApplicationContext(),android.R.layout.simple_list_item_1,mLabelArray)
{
@Override
public View getView(int position,View convertView,ViewGroup parent)
{
Log.d("111","count="+position);
// if (convertView != null && convertView instanceof galleryViewItem)
// {
// galleryViewItem galleryView = (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);
//
// return galleryView;
//
// }
return new galleryViewItem(getApplicationContext(),position);
}
});
LinearLayout layout = new LinearLayout(getApplicationContext());
layout.setorientation(LinearLayout.VERTICAL);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT);
layoutParams.setMargins(10,10,10);
layoutParams.weight = 1.0f;
layout.addView(mgallery,layoutParams);
mCheckBox = new CheckBox(getApplicationContext());
mCheckBox.setText("gallery is Circular");
mCheckBox.setText("gallery is Circular");
mCheckBox.setPadding(50,10);
mCheckBox.setTextSize(30);
mCheckBox.setChecked(true);
mCheckBox.setonClickListener(new OnClickListener()
{
@Override
public void onClick(View view)
{
mgallery.setIsgalleryCircular(mCheckBox.isChecked());
}
});
layout.addView(mCheckBox,new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.WRAP_CONTENT));
setContentView(layout);
}
private class galleryViewItem extends TableLayout
{
private EditText mEdit1;
private TextView mText1;
private TextView mText2;
private Button mButton1;
private Button mButton2;
public galleryViewItem(Context context,int position)
{
super(context);
this.setorientation(LinearLayout.VERTICAL);
this.setLayoutParams(new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.MATCH_PARENT,
LinearLayout.LayoutParams.MATCH_PARENT));
mEdit1 = new EditText(context);
this.addView(mEdit1,
LinearLayout.LayoutParams.WRAP_CONTENT));
mText1 = new TextView(context);
mText1.setText(mLabelArray[position]);
mText1.setTextSize(30);
mText1.setGravity(Gravity.LEFT);
mText1.setBackgroundColor(mColorArray[position]);
this.addView(mText1,
LinearLayout.LayoutParams.WRAP_CONTENT));
mButton1 = new Button(context);
mButton1.setText("<<");
mButton1.setGravity(Gravity.LEFT);
mButton1.setonClickListener(new OnClickListener()
{
@Override
public void onClick(View view)
{
mgallery.movePrevIoUs();
}
});
this.addView(mButton1,
LinearLayout.LayoutParams.WRAP_CONTENT));
mButton2 = new Button(context);
mButton2.setText(">>");
mButton2.setGravity(Gravity.RIGHT);
mButton2.setonClickListener(new OnClickListener()
{
@Override
public void onClick(View view)
{
mgallery.moveNext();
}
});
this.addView(mButton2,
LinearLayout.LayoutParams.WRAP_CONTENT));
mText2 = new TextView(context);
mText2.setText(mLabelArray[position]);
mText2.setTextSize(30);
mText2.setGravity(Gravity.RIGHT);
mText2.setBackgroundColor(mColorArray[position]);
this.addView(mText2,
LinearLayout.LayoutParams.MATCH_PARENT,1));
}
}
}
[代码]Flinggallery
import android.content.Context;
import android.view.GestureDetector;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.Interpolator;
import android.view.animation.Transformation;
import android.widget.Adapter;
import android.widget.FrameLayout;
import android.widget.LinearLayout;
// Todo:
// 1. In order to improve performance Cache screen bitmap and use for animation
// 2. Establish superfluous memory allocations and delay or replace with reused objects
// Probably need to make sure we are not allocating objects (strings,etc.) in loops
public class Flinggallery extends FrameLayout
{
// Constants
private final int swipe_min_distance = 120;
private final int swipe_max_off_path = 250;
private final int swipe_threshold_veloicty = 400;
// Properties
private int mViewPaddingWidth = 0;
private int mAnimationDuration = 250;
private float mSnapBorderRatio = 0.5f;
private boolean mIsgalleryCircular = true;
// Members
private int mgalleryWidth = 0;
private boolean mIsTouched = false;
private boolean mIsDragging = false;
private float mCurrentOffset = 0.0f;
private long mScrollTimestamp = 0;
private int mFlingDirection = 0;
private int mCurrentPosition = 0;
private int mCurrentViewNumber = 0;
private Context mContext;
private Adapter mAdapter;
private FlinggalleryView[] mViews;
private FlinggalleryAnimation mAnimation;
private GestureDetector mGestureDetector;
private Interpolator mDecelerateInterpolater;
public Flinggallery(Context context)
{
super(context);
mContext = context;
mAdapter = null;
mViews = new FlinggalleryView[3];
mViews[0] = new FlinggalleryView(0,this);
mViews[1] = new FlinggalleryView(1,this);
mViews[2] = new FlinggalleryView(2,this);
mAnimation = new FlinggalleryAnimation();
mGestureDetector = new GestureDetector(new FlingGestureDetector());
mDecelerateInterpolater = AnimationUtils.loadInterpolator(mContext,android.R.anim.decelerate_interpolator);
}
public void setPaddingWidth(int viewPaddingWidth)
{
mViewPaddingWidth = viewPaddingWidth;
}
public void setAnimationDuration(int animationDuration)
{
mAnimationDuration = animationDuration;
}
public void setSnapBorderRatio(float snapBorderRatio)
{
mSnapBorderRatio = snapBorderRatio;
}
public void setIsgalleryCircular(boolean isgalleryCircular)
{
if (mIsgalleryCircular != isgalleryCircular)
{
mIsgalleryCircular = isgalleryCircular;
if (mCurrentPosition == getFirstPosition())
{
// We need to reload the view immediately to the left to change it to circular view or blank
mViews[getPrevViewNumber(mCurrentViewNumber)].recycleView(getPrevPosition(mCurrentPosition));
}
if (mCurrentPosition == getLastPosition())
{
// We need to reload the view immediately to the right to change it to circular view or blank
mViews[getNextViewNumber(mCurrentViewNumber)].recycleView(getNextPosition(mCurrentPosition));
}
}
}
public int getgalleryCount()
{
return (mAdapter == null) ? 0 : mAdapter.getCount();
}
public int getFirstPosition()
{
return 0;
}
public int getLastPosition()
{
return (getgalleryCount() == 0) ? 0 : getgalleryCount() - 1;
}
private int getPrevPosition(int relativePosition)
{
int prevPosition = relativePosition - 1;
if (prevPosition < getFirstPosition())
{
prevPosition = getFirstPosition() - 1;
if (mIsgalleryCircular == true)
{
prevPosition = getLastPosition();
}
}
return prevPosition;
}
private int getNextPosition(int relativePosition)
{
int nextPosition = relativePosition + 1;
if (nextPosition > getLastPosition())
{
nextPosition = getLastPosition() + 1;
if (mIsgalleryCircular == true)
{
nextPosition = getFirstPosition();
}
}
return nextPosition;
}
private int getPrevViewNumber(int relativeViewNumber)
{
return (relativeViewNumber == 0) ? 2 : relativeViewNumber - 1;
}
private int getNextViewNumber(int relativeViewNumber)
{
return (relativeViewNumber == 2) ? 0 : relativeViewNumber + 1;
}
@Override
protected void onLayout(boolean changed,int left,int top,int right,int bottom)
{
super.onLayout(changed,left,top,right,bottom);
// Calculate our view width
mgalleryWidth = right - left;
if (changed == true)
{
// Position views at correct starting offsets
mViews[0].setoffset(0,mCurrentViewNumber);
mViews[1].setoffset(0,mCurrentViewNumber);
mViews[2].setoffset(0,mCurrentViewNumber);
}
}
public void setAdapter(Adapter adapter)
{
mAdapter = adapter;
mCurrentPosition = 0;
mCurrentViewNumber = 0;
// Load the initial views from adapter
mViews[0].recycleView(mCurrentPosition);
mViews[1].recycleView(getNextPosition(mCurrentPosition));
mViews[2].recycleView(getPrevPosition(mCurrentPosition));
// Position views at correct starting offsets
mViews[0].setoffset(0,mCurrentViewNumber);
}
private int getViewOffset(int viewNumber,int relativeViewNumber)
{
// Determine width including configured padding width
int offsetWidth = mgalleryWidth + mViewPaddingWidth;
// Position the prevIoUs view one measured width to left
if (viewNumber == getPrevViewNumber(relativeViewNumber))
{
return offsetWidth;
}
// Position the next view one measured width to the right
if (viewNumber == getNextViewNumber(relativeViewNumber))
{
return offsetWidth * -1;
}
return 0;
}
void movePrevIoUs()
{
// Slide to prevIoUs view
mFlingDirection = 1;
processGesture();
}
void moveNext()
{
// Slide to next view
mFlingDirection = -1;
processGesture();
}
@Override
public boolean onKeyDown(int keyCode,KeyEvent event)
{
switch (keyCode)
{
case KeyEvent.KEYCODE_DPAD_LEFT:
movePrevIoUs();
return true;
case KeyEvent.KEYCODE_DPAD_RIGHT:
moveNext();
return true;
case KeyEvent.KEYCODE_DPAD_CENTER:
case KeyEvent.KEYCODE_ENTER:
}
return super.onKeyDown(keyCode,event);
}
public boolean ongalleryTouchEvent(MotionEvent event)
{
boolean consumed = mGestureDetector.onTouchEvent(event);
if (event.getAction() == MotionEvent.ACTION_UP)
{
if (mIsTouched || mIsDragging)
{
processScrollSnap();
processGesture();
}
}
return consumed;
}
void processGesture()
{
int newViewNumber = mCurrentViewNumber;
int reloadViewNumber = 0;
int reloadPosition = 0;
mIsTouched = false;
mIsDragging = false;
if (mFlingDirection > 0)
{
if (mCurrentPosition > getFirstPosition() || mIsgalleryCircular == true)
{
// Determine prevIoUs view and outgoing view to recycle
newViewNumber = getPrevViewNumber(mCurrentViewNumber);
mCurrentPosition = getPrevPosition(mCurrentPosition);
reloadViewNumber = getNextViewNumber(mCurrentViewNumber);
reloadPosition = getPrevPosition(mCurrentPosition);
}
}
if (mFlingDirection < 0)
{
if (mCurrentPosition < getLastPosition() || mIsgalleryCircular == true)
{
// Determine the next view and outgoing view to recycle
newViewNumber = getNextViewNumber(mCurrentViewNumber);
mCurrentPosition = getNextPosition(mCurrentPosition);
reloadViewNumber = getPrevViewNumber(mCurrentViewNumber);
reloadPosition = getNextPosition(mCurrentPosition);
}
}
if (newViewNumber != mCurrentViewNumber)
{
mCurrentViewNumber = newViewNumber;
// Reload outgoing view from adapter in new position
mViews[reloadViewNumber].recycleView(reloadPosition);
}
// Ensure input focus on the current view
mViews[mCurrentViewNumber].requestFocus();
// Run the slide animations for view transitions
mAnimation.prepareAnimation(mCurrentViewNumber);
this.startAnimation(mAnimation);
// Reset fling state
mFlingDirection = 0;
}
void processScrollSnap()
{
// Snap to next view if scrolled passed snap position
float rollEdgeWidth = mgalleryWidth * mSnapBorderRatio;
int rollOffset = mgalleryWidth - (int) rollEdgeWidth;
int currentOffset = mViews[mCurrentViewNumber].getCurrentOffset();
if (currentOffset <= rollOffset * -1)
{
// Snap to prevIoUs view
mFlingDirection = 1;
}
if (currentOffset >= rollOffset)
{
// Snap to next view
mFlingDirection = -1;
}
}
private class FlinggalleryView
{
private int mViewNumber;
private FrameLayout mParentLayout;
private FrameLayout mInvalidLayout = null;
private LinearLayout mInternalLayout = null;
private View mExternalView = null;
public FlinggalleryView(int viewNumber,FrameLayout parentLayout)
{
mViewNumber = viewNumber;
mParentLayout = parentLayout;
// Invalid layout is used when outside gallery
mInvalidLayout = new FrameLayout(mContext);
mInvalidLayout.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
// Internal layout is permanent for duration
mInternalLayout = new LinearLayout(mContext);
mInternalLayout.setLayoutParams(new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
mParentLayout.addView(mInternalLayout);
}
public void recycleView(int newPosition)
{
if (mExternalView != null)
{
mInternalLayout.removeView(mExternalView);
}
if (mAdapter != null)
{
if (newPosition >= getFirstPosition() && newPosition <= getLastPosition())
{
mExternalView = mAdapter.getView(newPosition,mExternalView,mInternalLayout);
}
else
{
mExternalView = mInvalidLayout;
}
}
if (mExternalView != null)
{
mInternalLayout.addView(mExternalView,new LinearLayout.LayoutParams(
LayoutParams.MATCH_PARENT,LayoutParams.MATCH_PARENT));
}
}
public void setoffset(int xOffset,int yOffset,int relativeViewNumber)
{
// Scroll the target view relative to its own position relative to currently displayed view
mInternalLayout.scrollTo(getViewOffset(mViewNumber,relativeViewNumber) + xOffset,yOffset);
}
public int getCurrentOffset()
{
// Return the current scroll position
return mInternalLayout.getScrollX();
}
public void requestFocus()
{
mInternalLayout.requestFocus();
}
}
private class FlinggalleryAnimation extends Animation
{
private boolean mIsAnimationInProgres;
private int mRelativeViewNumber;
private int mInitialOffset;
private int mTargetoffset;
private int mTargetdistance;
public FlinggalleryAnimation()
{
mIsAnimationInProgres = false;
mRelativeViewNumber = 0;
mInitialOffset = 0;
mTargetoffset = 0;
mTargetdistance = 0;
}
public void prepareAnimation(int relativeViewNumber)
{
// If we are animating relative to a new view
if (mRelativeViewNumber != relativeViewNumber)
{
if (mIsAnimationInProgres == true)
{
// We only have three views so if requested again to animate in same direction we must snap
int newDirection = (relativeViewNumber == getPrevViewNumber(mRelativeViewNumber)) ? 1 : -1;
int animDirection = (mTargetdistance < 0) ? 1 : -1;
// If animation in same direction
if (animDirection == newDirection)
{
// Ran out of time to animate so snap to the target offset
mViews[0].setoffset(mTargetoffset,mRelativeViewNumber);
mViews[1].setoffset(mTargetoffset,mRelativeViewNumber);
mViews[2].setoffset(mTargetoffset,mRelativeViewNumber);
}
}
// Set relative view number for animation
mRelativeViewNumber = relativeViewNumber;
}
// Note: In this implementation the targetoffset will always be zero
// as we are centering the view; but we include the calculations of
// targetoffset and targetdistance for use in future implementations
mInitialOffset = mViews[mRelativeViewNumber].getCurrentOffset();
mTargetoffset = getViewOffset(mRelativeViewNumber,mRelativeViewNumber);
mTargetdistance = mTargetoffset - mInitialOffset;
// Configure base animation properties
this.setDuration(mAnimationDuration);
this.setInterpolator(mDecelerateInterpolater);
// Start/continued animation
mIsAnimationInProgres = true;
}
@Override
protected void applyTransformation(float interpolatedTime,Transformation transformation)
{
// Ensure interpolatedTime does not over-shoot then calculate new offset
interpolatedTime = (interpolatedTime > 1.0f) ? 1.0f : interpolatedTime;
int offset = mInitialOffset + (int) (mTargetdistance * interpolatedTime);
for (int viewNumber = 0; viewNumber < 3; viewNumber++)
{
// Only need to animate the visible views as the other view will always be off-screen
if ((mTargetdistance > 0 && viewNumber != getNextViewNumber(mRelativeViewNumber)) ||
(mTargetdistance < 0 && viewNumber != getPrevViewNumber(mRelativeViewNumber)))
{
mViews[viewNumber].setoffset(offset,mRelativeViewNumber);
}
}
}
@Override
public boolean getTransformation(long currentTime,Transformation outTransformation)
{
if (super.getTransformation(currentTime,outTransformation) == false)
{
// Perform final adjustment to offsets to cleanup animation
mViews[0].setoffset(mTargetoffset,mRelativeViewNumber);
// Reached the animation target
mIsAnimationInProgres = false;
return false;
}
// Cancel if the screen touched
if (mIsTouched || mIsDragging)
{
// Note that at this point we still consider ourselves to be animating
// because we have not yet reached the target offset; its just that the
// user has temporarily interrupted the animation with a touch gesture
return false;
}
return true;
}
}
private class FlingGestureDetector extends GestureDetector.SimpleOnGestureListener
{
@Override
public boolean onDown(MotionEvent e)
{
// Stop animation
mIsTouched = true;
// Reset fling state
mFlingDirection = 0;
return true;
}
@Override
public boolean onScroll(MotionEvent e1,MotionEvent e2,float distanceX,float distanceY)
{
if (e2.getAction() == MotionEvent.ACTION_MOVE)
{
if (mIsDragging == false)
{
// Stop animation
mIsTouched = true;
// Reconfigure scroll
mIsDragging = true;
mFlingDirection = 0;
mScrollTimestamp = System.currentTimeMillis();
mCurrentOffset = mViews[mCurrentViewNumber].getCurrentOffset();
}
float maxVeLocity = mgalleryWidth / (mAnimationDuration / 1000.0f);
long timestampDelta = System.currentTimeMillis() - mScrollTimestamp;
float maxScrollDelta = maxVeLocity * (timestampDelta / 1000.0f);
float currentScrollDelta = e1.getX() - e2.getX();
if (currentScrollDelta < maxScrollDelta * -1) currentScrollDelta = maxScrollDelta * -1;
if (currentScrollDelta > maxScrollDelta) currentScrollDelta = maxScrollDelta;
int scrollOffset = Math.round(mCurrentOffset + currentScrollDelta);
// We can't scroll more than the width of our own frame layout
if (scrollOffset >= mgalleryWidth) scrollOffset = mgalleryWidth;
if (scrollOffset <= mgalleryWidth * -1) scrollOffset = mgalleryWidth * -1;
mViews[0].setoffset(scrollOffset,mCurrentViewNumber);
mViews[1].setoffset(scrollOffset,mCurrentViewNumber);
mViews[2].setoffset(scrollOffset,mCurrentViewNumber);
}
return false;
}
@Override
public boolean onFling(MotionEvent e1,float veLocityX,float veLocityY)
{
if (Math.abs(e1.getY() - e2.getY()) <= swipe_max_off_path)
{
if (e2.getX() - e1.getX() > swipe_min_distance && Math.abs(veLocityX) > swipe_threshold_veloicty)
{
movePrevIoUs();
}
if(e1.getX() - e2.getX() > swipe_min_distance && Math.abs(veLocityX) > swipe_threshold_veloicty)
{
moveNext();
}
}
return false;
}
@Override
public void onLongPress(MotionEvent e)
{
// Finalise scrolling
mFlingDirection = 0;
processGesture();
}
@Override
public void onShowPress(MotionEvent e)
{
}
@Override
public boolean onSingleTapUp(MotionEvent e)
{
// Reset fling state
mFlingDirection = 0;
return false;
}
}
}
