一个方便集成的 Android(安卓)右滑返回上级 控件
16lz
2021-01-25
首先这个需求来着与 一款线上项目 要添加上 右滑返回高级页的一个效果( = = #因为IOS有)；
首先分析下 需求： 任何页面上右滑返回上级。考虑到 Android用栈来处理页面，那需要做的 只是关闭当前页面就哦了。
我们要做到的 :
1/ onInterceptTouchEvent(MotionEvent ev) 中 对不同事件 进行判断 并作拦截处理
2/ 如果拦截到了 则在 onTouchEvent(MotionEvent event) 中 对添加对移动距离 以及相应动画效果。
反之 则交给相应控件自己处理。
主要功能就是这两点了，考虑到viewPager也是比较常见的控件 于是在内做了判断处理；测试阶段 发现自定义控件、BaiduMapVIew 事件上的冲突，添加了 setIgnoreView(View view)、removeIgnoreView(View view)方法。
当然还有最重要的一点要方便 线上集成的 attachToActivity(): 考虑到所有页面的view都绑定在window的RelativeLayout上， 参考系统 setContentView( ) 方法；
最重要的 一句话绑定 集成该控件。
//BaseActivity中 添加if (isOpenSwipeBack()) { layout = new SwipeBackLayout(this); layout.attachToActivity(this);}//为了拓展性 对外暴露 isOpenSwipeBack() 方法。下面是最重要的 控件的方法
import java.lang.ref.WeakReference; import java.util.ArrayList; import java.util.LinkedList; import java.util.List; import android.app.Activity; import android.content.Context; import android.content.res.TypedArray; import android.graphics.Canvas; import android.graphics.Rect; import android.graphics.drawable.Drawable; import android.support.v4.view.ViewPager; import android.util.AttributeSet; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.ViewConfiguration; import android.view.ViewGroup; import android.widget.FrameLayout; import android.widget.Scroller; import com.sino.fanxq.R; public class SwipeBackLayout extends FrameLayout { private static final String TAG = SwipeBackLayout.class.getSimpleName(); private View mContentView; private int mTouchSlop; private int downX; private int downY; private int tempX; private Scroller mScroller; private int viewWidth; private boolean isSilding; private boolean isFinish; private Drawable mShadowDrawable; private Activity mActivity; private List<ViewPager> mViewPagers = new LinkedList<ViewPager>(); public SwipeBackLayout(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SwipeBackLayout(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); //触发移动事件的距离 mTouchSlop = ViewConfiguration.get(context).getScaledTouchSlop(); mScroller = new Scroller(context); mShadowDrawable = getResources().getDrawable(R.drawable.shadow_left); } public void attachToActivity(Activity activity) { mActivity = activity; TypedArray a = activity.getTheme().obtainStyledAttributes(new int[] { android.R.attr.windowBackground }); int background = a.getResourceId(0, 0); a.recycle(); ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView(); ViewGroup decorChild = (ViewGroup) decor.getChildAt(0); decorChild.setBackgroundResource(background); decor.removeView(decorChild); addView(decorChild); setContentView(decorChild); decor.addView(this); } private void setContentView(View decorChild) { mContentView = (View) decorChild.getParent(); } /** * 事件拦截操作 */ @Override public boolean onInterceptTouchEvent(MotionEvent ev) { // 处理ViewPager冲突问题 ViewPager mViewPager = getTouchViewPager(mViewPagers, ev); // Log.i(TAG, "mViewPager = " + mViewPager); if (mViewPager != null && mViewPager.getCurrentItem() != 0) { return super.onInterceptTouchEvent(ev); } View ignoreView = getTouchIgnoreView(ignoreViews, ev); if (ignoreView != null) { Log.i(TAG, "ignoreView》》》》》》》》》》》》》》》》ignoreView"); return false; } switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: downX = tempX = (int) ev.getRawX(); downY = (int) ev.getRawY(); break; case MotionEvent.ACTION_MOVE: int moveX = (int) ev.getRawX(); // 满足此条件屏蔽SildingFinishLayout里面子类的touch事件 if (moveX - downX > mTouchSlop && Math.abs((int) ev.getRawY() - downY) < mTouchSlop) { return true; } break; } return super.onInterceptTouchEvent(ev); } private List<WeakReference<View>> ignoreViews = new ArrayList<WeakReference<View>>(); public void setIgnoreView(View view) { if (view == null) { return; } WeakReference<View> mReference = new WeakReference<View>(view); if (!ignoreViews.contains(view)) { ignoreViews.add(mReference); } } public void removeIgnoreView(View view) { if (view == null) { return; } WeakReference<View> mReference = new WeakReference<View>(view); if (ignoreViews.contains(mReference)) { ignoreViews.remove(mReference); } } private View getTouchIgnoreView(List<WeakReference<View>> ignoreViews, MotionEvent ev) { if (ignoreViews == null || ignoreViews.size() == 0) { return null; } Rect mRect = new Rect(); for (WeakReference<View> v : ignoreViews) { v.get().getGlobalVisibleRect(mRect); // v.getHitRect(mRect); if (mRect.contains((int) ev.getX(), (int) ev.getY())) { return v.get(); } } return null; }; @Override public boolean onTouchEvent(MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_MOVE: int moveX = (int) event.getRawX(); int deltaX = tempX - moveX; tempX = moveX; if (moveX - downX > mTouchSlop && Math.abs((int) event.getRawY() - downY) < mTouchSlop) { isSilding = true; } if (moveX - downX >= 0 && isSilding) { mContentView.scrollBy(deltaX, 0); } break; case MotionEvent.ACTION_UP: isSilding = false; if (mContentView.getScrollX() <= -viewWidth / 2) { isFinish = true; scrollRight(); } else { scrollOrigin(); isFinish = false; } break; } return true; } /** * 获取SwipeBackLayout里面的ViewPager的集合 * * @param mViewPagers * @param parent */ private void getAlLViewPager(List<ViewPager> mViewPagers, ViewGroup parent) { int childCount = parent.getChildCount(); for (int i = 0; i < childCount; i++) { View child = parent.getChildAt(i); if (child instanceof ViewPager) { mViewPagers.add((ViewPager) child); } else if (child instanceof ViewGroup) { getAlLViewPager(mViewPagers, (ViewGroup) child); } } } /** * 返回我们touch的ViewPager * * @param mViewPagers * @param ev * @return */ private ViewPager getTouchViewPager(List<ViewPager> mViewPagers, MotionEvent ev) { if (mViewPagers == null || mViewPagers.size() == 0) { return null; } Rect mRect = new Rect(); for (ViewPager v : mViewPagers) { v.getGlobalVisibleRect(mRect); // v.getHitRect(mRect); if (mRect.contains((int) ev.getX(), (int) ev.getY())) { return v; } } return null; } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { super.onLayout(changed, l, t, r, b); if (changed) { viewWidth = this.getWidth(); getAlLViewPager(mViewPagers, this); // Log.i(TAG, "ViewPager size = " + mViewPagers.size()); } } @Override protected void dispatchDraw(Canvas canvas) { super.dispatchDraw(canvas); if (mShadowDrawable != null && mContentView != null) { int left = mContentView.getLeft() - mShadowDrawable.getIntrinsicWidth(); int right = left + mShadowDrawable.getIntrinsicWidth(); int top = mContentView.getTop(); int bottom = mContentView.getBottom(); mShadowDrawable.setBounds(left, top, right, bottom); mShadowDrawable.draw(canvas); } } /** * 滚动出界面 */ private void scrollRight() { final int delta = (viewWidth + mContentView.getScrollX()); // 调用startScroll方法来设置一些滚动的参数，我们在computeScroll()方法中调用scrollTo来滚动item mScroller.startScroll(mContentView.getScrollX(), 0, -delta + 1, 0, Math.abs(delta)); postInvalidate(); } /** * 滚动到起始位置 */ private void scrollOrigin() { int delta = mContentView.getScrollX(); mScroller.startScroll(mContentView.getScrollX(), 0, -delta, 0, Math.abs(delta)); postInvalidate(); } @Override public void computeScroll() { // 调用startScroll的时候scroller.computeScrollOffset()返回true， if (mScroller.computeScrollOffset()) { mContentView.scrollTo(mScroller.getCurrX(), mScroller.getCurrY()); postInvalidate(); if (mScroller.isFinished() && isFinish) { mActivity.finish(); } } } } 更多相关文章
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