问题描述
我一直在努力实现四个方向轻扫导航。而且我对如何把东西放在一起的一些问题。
I've been trying to implement four directional swipe navigation. And I have some questions on how to put things together.
- 在考虑使用碎片。请问这锻炼？
- 在另一个想法是建立一个相对大的布局和安排意见，显示在图片。但是，可能会产生旋转装置波泰特/景观时的问题。
- 不知怎么模仿刷卡效果
如何所有这些问题都会锻炼？任何人都可以帮助它。我已经发现了关于向 TouchMove 功能问题
How all these points will workout? Can anyone help with it.I already found questions regarding to TouchMove feature
- 在只有四个方向触摸运动？
- Android - 基本手势检测
- https://github.com/JakeWharton/Android-DirectionalViewPager/
- Touch movement in only four directions?
- Android - basic gesture detection
- https://github.com/JakeWharton/Android-DirectionalViewPager/
任何建议和帮助是AP preciated，其原因是，我是比较新的Android开发。
Any advice and help is appreciated, the reason is that I'm relatively new to android development.
推荐答案
不是那么难的任务，这要归功于它的滚轮几乎易蛋糕
not so hard task, thanks to Scroller its almost easy cake
如果你想放像按钮等一些互动性意见（我敢打赌，你会），你需要重写onInterceptTouchEvent（MotionEvent EV）
if you want to put some interactive Views like Button etc (and i bet you will) you need to override onInterceptTouchEvent(MotionEvent ev)
public class FourDirectionLayout extends ViewGroup {
private GestureDetector mDetector;
private Scroller mScroller;
private final String[] TEXTS = {
"left view, left swipe only",
"right view, right swipe only",
"top view, top swipe only",
"bottom view, bottom swipe only",
"central view, swipe to the left, right, top or bottom",
};
private final int[] COLORS = {
0xaa0000ff, 0xaa0000ff, 0xaaff0000, 0xaaff0000, 0xaa00ff00
};
private final int[] PACKED_OFFSETS = {
-1, 0, 1, 0, 0, -1, 0, 1, 0, 0
};
public FourDirectionLayout(Context context) {
super(context);
for (int i = 0; i < TEXTS.length; i++) {
TextView tv = new TextView(context);
tv.setTag(i);
tv.setTextSize(32);
tv.setTypeface(Typeface.DEFAULT_BOLD);
tv.setTextColor(0xffeeeeee);
tv.setText(TEXTS[i]);
tv.setBackgroundColor(COLORS[i]);
addView(tv);
}
mDetector = new GestureDetector(context, mListener);
mScroller = new Scroller(context);
}
private OnGestureListener mListener = new SimpleOnGestureListener() {
public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX, float velocityY) {
if (!mScroller.isFinished()) {
return false;
}
int sx = getScrollX();
int sy = getScrollY();
int w = getWidth();
int h = getHeight();
int DURATION = 500;
// check if horizontal/vertical fling
if (Math.abs(velocityX) > Math.abs(velocityY)) {
if (sy != 0 || velocityX * sx < 0) {
return false;
}
// DURATION = (int) (1000 * w / Math.abs(velocityX));
int distance = velocityX < 0? w : -w;
mScroller.startScroll(sx, sy, distance, 0, DURATION);
} else {
if (sx != 0 || velocityY * sy < 0) {
return false;
}
// DURATION = (int) (1000 * h / Math.abs(velocityY));
int distance = velocityY < 0? h : -h;
mScroller.startScroll(sx, sy, 0, distance, DURATION);
}
invalidate();
return true;
}
};
@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
scrollTo(mScroller.getCurrX(), mScroller.getCurrY());
invalidate();
}
}
@Override
public boolean onTouchEvent(MotionEvent event) {
mDetector.onTouchEvent(event);
return true;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
int cnt = getChildCount();
for (int i = 0; i < cnt ; i++) {
View child = getChildAt(i);
int idx = (Integer) child.getTag() << 1;
int xOffset = (r - l) * PACKED_OFFSETS[idx];
int yOffset = (b - t) * PACKED_OFFSETS[idx + 1];
child.layout(l + xOffset, t + yOffset, r + xOffset, b + yOffset);
}
}
}
要测试它在你的Activity.onCreate补充一点：
to test it add this in your Activity.onCreate:
ViewGroup layout = new FourDirectionLayout(this);
setContentView(layout);
这篇关于安卓：四个方向导航的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！