我试图让一个应用程序，用户可以在刷卡并更改该片段他们看到在屏幕上。我不能使用视图寻呼机，因为我希望用户能够刷到不同的片段，直到永远。这里是我的片段检测器：
I am trying to make an app where a user can swipe and change which fragment they are seeing on the screen. I can not use view pager because I want the user to be able to swipe to different fragments forever. Here is the detector in my fragment:
class MyGestureDetector extends SimpleOnGestureListener {
@Override
public boolean onDown(MotionEvent e) {
return true;
}
@Override
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE & Math.abs(velocityX) > 10) {
left();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE & Math.abs(velocityX) > 10) {
right();
}
return false;
}
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY){
if(e1.getX() - e2.getX() > SWIPE_MIN_DISTANCE & distanceX > distanceY) {
left();
} else if (e2.getX() - e1.getX() > SWIPE_MIN_DISTANCE & distanceX > distanceY) {
right();
}
return false;
}
}
public void right(){
mCallback.dateNumber(true);
sportView.setText("Loading");
}public void left(){
mCallback.dateNumber(false);
sportView.setText("Loading");
}
在我的活动，这里是我加改变片段监听器：
In my activity, here is the listener that I added to change fragments:
@Override
public void dateNumber(Boolean left_right) {
//true == right
//false == left
if(left_right == false){
day = day + 1;
Fragment1 rightFragment = new Fragment1();
Bundle args = new Bundle();
args.putInt("day", day);
rightFragment.setArguments(args);
android.support.v4.app.FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, rightFragment);
transaction.addToBackStack(null);
transaction.commit();
}else if(left_right == true){
day = day - 1;
Fragment1 leftFragment = new Fragment1();
Bundle args = new Bundle();
args.putInt("day", day);
leftFragment.setArguments(args);
android.support.v4.app.FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, leftFragment);
transaction.addToBackStack(null);
transaction.commit();
}
left_right = null;
}
我知道，滑动手势总是被公认，但有时新的片段会开不起来。没有人知道为什么？
I know that the swipe gesture is always being recognized but sometimes the new fragment won't open up. Does anyone know why?
推荐答案
首先，你真的可以使用的 droidQuery ：
First of all, you can really simplify your swipe code using droidQuery:
//global variables
private boolean isSwiping = false;
private SwipeDetector.Direction swipeDirection = null;
private View v;//set to the parent layout of the fragments.
//swipe-handling code
$.with(v).swipe(new Function() {
@Override
public void invoke($ droidQuery, Object... params) {
if (params[0] == SwipeDetector.Direction.START)
isSwiping = true;
else if (params[0] == SwipeDetector.Direction.STOP) {
if (isSwiping) {
isSwiping = false;
if (swipeDirection != null) {
switch(swipeDirection) {
case DOWN :
//TODO: Down swipe complete, so do something
break;
case UP :
//TODO: Up swipe complete, so do something
break;
case LEFT :
//TODO: Left swipe complete, so do something
break;
case RIGHT :
//TODO: Right swipe complete, so do something (such as):
day++;
Fragment1 rightFragment = new Fragment1();
Bundle args = new Bundle();
args.putInt("day", day);
rightFragment.setArguments(args);
android.support.v4.app.FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.fragment_container, rightFragment);
transaction.addToBackStack(null);
transaction.commit();
break;
default :
break;
}
}
}
}
else {
swipeDirection = (SwipeDetector.Direction) params[0];
}
}
});
您可以找到更多的片段交易here.
You can find more on Fragment transactions here.
此外，考虑保持一个内部偏移变量，跟踪的 +/- 从零偏移。因此，举例来说，你可以从的ArrayList 获得已实例化的片段，然后就换出一个在 mArrayList.get（补偿），和丢权当，做偏移++ ，和偏移 - '左刷卡
Also, consider keeping an int offset variable that keeps track of the +/- offset from zero. So for instance, you could get the already-instantiated Fragments from an ArrayList, then just swap out the one at mArrayList.get(offset), and when flinging right, do offset++, and 'offset--` for left swipes.
的要求，在评论，这code，可用于处理挥笔和一个小孩图片点击：
As requested in the comments, this code can be used to handle swipes and a child image click:
包括 SwipeInterceptorView 在主布局（ RES /布局/ main.xml中）：
<?xml version="1.0" encoding="utf-8"?>
<self.philbrown.SwipeInterceptorView xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/swipe_view"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</self.philbrown.SwipeInterceptorView>
您需要有类变量：
SwipeInterceptorView view;//instantiated in onCreate
ImageView fragImage;//must be instantiated when the new Fragment is transitioned in
接下来，包括以下组件的onCreate ：
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//set main view to the main layout
setContentView(R.layout.main);
//get a reference to the content view
view = (SwipeInterceptorView) findViewById(R.id.swipe_view);
//add Swiper
view.setSwipeListener(new SwipeListener() {
public void onUpSwipe(View v) {
//TODO handle up swipe
}
public void onRightSwipe(View v) {
//TODO handle right swipe
}
public void onLeftSwipe(View v) {
//TODO handle left swipe
}
public void onDownSwipe(View v) {
//TODO handle down swipe
}
});
view.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
return super.onTouch(v, event);
}
});
}
在包含ImageView的新片段转换，你需要引用它，并更新刷卡拦截器的onTouch方式：
When the new Fragment containing the ImageView is transitioned in, you need to reference it and update the swipe interceptor's onTouch method:
fragImage = (ImageView) fragment/* references the now non-null, on-display fragment */.getView().findViewById(R.id.yourImageId);
int[] origin = new int[2];
fragImage.getLocationOnScreen(origin);
final Rect bounds = new Rect(origin[0], origin[1], fragImage.getRight(), fragImage.getBottom());
view.setOnTouchListener(new View.OnTouchListener() {
@Override
public void onTouch(View v, MotionEvent event) {
if (bounds.contains(event.getRawX(), event.getRawY())) {
return false;//now clicks will be handled by the Image.
}
return v.onTouchEvent(event);
}
});
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