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触屏事件的拦截、分发处理
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@chiemy
chiemy committed Aug 31, 2014
1 parent 3068dd1 commit 40faaa8
Showing 1 changed file with 123 additions and 94 deletions.
217 changes: 123 additions & 94 deletions src/com/example/cviewpager/JellyViewPager.java
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Original file line number Diff line number Diff line change
Expand Up @@ -2,6 +2,7 @@

import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.support.v4.app.Fragment;
import android.support.v4.view.PagerAdapter;
Expand All @@ -12,6 +13,7 @@
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.Toast;

Expand All @@ -32,20 +34,21 @@ public class JellyViewPager extends ViewPager {
/**
* 滑动的最低速度
*/
private static final float FLING_VELOCITY = 500; // 100毫秒速度
private static final int UNIT = 100; // 计算速率的单位（毫秒）
private static float FLING_VELOCITY = 500;
private static final int UNIT = 1000; // 计算速率的单位（毫秒）

/**
* 手指滑动的距离，大于此距离时，移出屏幕
*/
private static float OUT_DISTANCE_BOUDARY;

private static float MAX_DEGREE = 15;

private float mTouchSlop;

private VelocityTracker vTracker;

private PagerAdapter mAdapter;
private MyTouchListener mListener;
private Spring mScaleSpring;
private Spring tranSpring;
private Spring rotateSpring;
Expand All @@ -54,14 +57,16 @@ public class JellyViewPager extends ViewPager {
private final ExampleSpringListener mSpringListener = new ExampleSpringListener();

private View currentView;
private Rect currentViewRect = new Rect();

private int currentItem = -1;

/**
* 屏幕高度
*/
private int screenHeight, screenWidth;
private int mHeight, mWidth;

private OnJellyPageChangeListener pageChangeListener;
private OnPageChangeListener pageChangeListener;

private SparseArray<Object> objs = new SparseArray<Object>();

Expand All @@ -77,31 +82,30 @@ public JellyViewPager(Context context, AttributeSet attrs) {

private void init(Context context) {
super.setOnPageChangeListener(new MyPageChageListener());
mListener = new MyTouchListener();

mScaleSpring = mSpringSystem.createSpring();
tranSpring = mSpringSystem.createSpring();
rotateSpring = mSpringSystem.createSpring();
mScaleSpring.addListener(mSpringListener);
tranSpring.addListener(mSpringListener);
rotateSpring.addListener(mSpringListener);

DisplayMetrics merics = context.getResources().getDisplayMetrics();
screenHeight = merics.heightPixels;
screenWidth = merics.widthPixels;

OUT_DISTANCE_BOUDARY = MAX_SCALE * screenHeight / 3;

ViewConfiguration configuration = ViewConfiguration.get(context);
//FLING_VELOCITY = configuration.getScaledMaximumFlingVelocity();
mTouchSlop = configuration.getScaledTouchSlop();
}

public void setOnPageChangeListener(OnJellyPageChangeListener listener) {
pageChangeListener = listener;
}

@Override
public void setAdapter(PagerAdapter adapter) {
mAdapter = adapter;
super.setAdapter(new ViewPagerAdapter());
}

@Override
public void setOnPageChangeListener(OnPageChangeListener listener) {
pageChangeListener = listener;
}

/**
* 重置spring
Expand All @@ -126,15 +130,15 @@ private void resetSpring() {
*/
public void showNext() {
resetSpring();
animOutIfNeeded(screenHeight, 0);
animOutIfNeeded(mHeight, 0);
}

/**
* 显示上一页
*/
public void showPre() {
resetSpring();
animOutIfNeeded(-screenHeight, 0);
animOutIfNeeded(-mHeight, 0);
}

private void nextPage() {
Expand Down Expand Up @@ -170,7 +174,6 @@ private boolean hasPre() {
*/
private View getCurrentView() {
View view = findViewFromObject(getCurrentItem());
render(view);
return view;
}

Expand Down Expand Up @@ -211,68 +214,21 @@ public void finishUpdate(ViewGroup container) {
}

}

@Override
protected void onLayout(boolean arg0, int arg1, int arg2, int arg3, int arg4) {
super.onLayout(arg0, arg1, arg2, arg3, arg4);
if(currentView == null){
currentView = findViewFromObject(0);
if(currentView != null){
currentView.setScaleX(MAX_SCALE);
currentView.setScaleY(MAX_SCALE);
render(currentView);
}
currentView = getCurrentView();
currentView.setScaleX(MAX_SCALE);
currentView.setScaleY(MAX_SCALE);
currentView.getHitRect(currentViewRect);
}
mHeight = getHeight();
mWidth = getWidth();
OUT_DISTANCE_BOUDARY = MAX_SCALE * mHeight / 3;
}

private void render(View view) {
view.setOnTouchListener(mListener);
}

private float downY, downX;
private float distance;

private class MyTouchListener implements OnTouchListener {
@Override
public boolean onTouch(View v, MotionEvent event) {
float currentY = event.getRawY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
if (vTracker == null) {
vTracker = VelocityTracker.obtain();
} else {
vTracker.clear();
}
vTracker.addMovement(event);
distance = 0;
downY = event.getRawY();
downX = event.getRawX();
resetSpring();
break;
case MotionEvent.ACTION_MOVE:
vTracker.addMovement(event);
distance = currentY - downY;
tranSpring.setEndValue(distance);
float degree = MAX_DEGREE * distance / screenHeight;
if (downX < screenWidth / 2) {
degree = -degree;
}
rotateSpring.setEndValue(degree);
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
vTracker.computeCurrentVelocity(UNIT);
float velocityY = vTracker.getYVelocity();
animOutIfNeeded(distance, velocityY);
if (vTracker != null) {
vTracker.recycle();
vTracker = null;
}
break;
}
return true;
}
}

/**
* 移出视图动画
Expand All @@ -288,7 +244,7 @@ private void animOutIfNeeded(float scrollDis, float velocityY) {
// 下移
if (velocityY > FLING_VELOCITY || (scrollDis > OUT_DISTANCE_BOUDARY)) {
if (hasNext()) {
tranY = screenHeight;
tranY = mHeight;
// 和endvalue不相等，不会rest，下一个view会出现旋转，所以要设置为rest
rotateSpring.setAtRest();
} else {
Expand All @@ -300,7 +256,7 @@ private void animOutIfNeeded(float scrollDis, float velocityY) {
} else if (velocityY < -FLING_VELOCITY
|| (scrollDis < -OUT_DISTANCE_BOUDARY)) { // 上移
if (hasPre()) {
tranY = -screenHeight;
tranY = -mHeight;
rotateSpring.setAtRest();
} else {
rotateSpring.setEndValue(0);
Expand Down Expand Up @@ -334,9 +290,9 @@ public void onSpringUpdate(Spring spring) {
if (springId.equals(tranSpring.getId())) {
currentView.setTranslationY(value);
if (spring.isAtRest()) {
if (value >= screenHeight) {
if (value >= mHeight) {
nextPage();
} else if (value <= -screenHeight) {
} else if (value <= -mHeight) {
prePage();
}
}
Expand Down Expand Up @@ -394,6 +350,96 @@ public View findViewFromObject(int position) {
API_11 = Build.VERSION.SDK_INT >= 11;
}


private float downY, downX,distanceY;
@Override
public boolean onTouchEvent(MotionEvent event) {
if (vTracker == null) {
vTracker = VelocityTracker.obtain();
}
vTracker.addMovement(event);
float currentY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = event.getY();
downX = event.getX();
if(!currentViewRect.contains((int)downX, (int)downY)){
return false;
}
break;
case MotionEvent.ACTION_MOVE:
distanceY = currentY - downY;
if(Math.abs(distanceY) > mTouchSlop){
if(pageChangeListener != null){
pageChangeListener.onPageScrolled(currentItem, (int)Math.abs(distanceY)/getHeight(), (int)distanceY);
pageChangeListener.onPageScrollStateChanged(SCROLL_STATE_DRAGGING);
}
tranSpring.setEndValue(distanceY);
float degree = MAX_DEGREE * distanceY / mHeight;
if (downX < mWidth / 2) {
degree = -degree;
}
rotateSpring.setEndValue(degree);
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
if(Math.abs(distanceY) > mTouchSlop){
if(pageChangeListener != null){
pageChangeListener.onPageScrollStateChanged(SCROLL_STATE_SETTLING);
}
final VelocityTracker tracker = vTracker;
tracker.computeCurrentVelocity(UNIT);
float velocityY = tracker.getYVelocity();
animOutIfNeeded(currentY - downY, velocityY);
if (vTracker != null) {
vTracker.recycle();
vTracker = null;
}
}
break;
}
return true;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (vTracker == null) {
vTracker = VelocityTracker.obtain();
}
vTracker.addMovement(event);
float currentY = event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
downY = event.getY();
downX = event.getX();
resetSpring();
break;
case MotionEvent.ACTION_MOVE:
float distance = Math.abs(currentY - downY);
if(distance > mTouchSlop){
//拦截，不向下传递
return true;
}
break;
case MotionEvent.ACTION_CANCEL:
case MotionEvent.ACTION_UP:
final VelocityTracker tracker = vTracker;
tracker.computeCurrentVelocity(UNIT);
float velocityY = tracker.getYVelocity();
if (vTracker != null) {
vTracker.recycle();
vTracker = null;
}
if(velocityY > FLING_VELOCITY){
//拦截，不向下传递
return true;
}
break;
}
return false;
}

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
private void manageLayer(View v, boolean enableHardware) {
if (!API_11)
Expand All @@ -415,25 +461,8 @@ private void disableHardwareLayer() {
v.setLayerType(View.LAYER_TYPE_NONE, null);
}
}



@Override
public boolean onTouchEvent(MotionEvent event) {
return false;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent event) {
return false;
}

@Override
@Deprecated
public void setOnPageChangeListener(OnPageChangeListener listener) {
throw new RuntimeException("setCurrentItem cannot be used.");
}

@Override
@Deprecated
public void setCurrentItem(int item) {
Expand Down

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