android 可滑动的View
16lz
2021-01-23
效果图如下：
方法一（实现原理，主要依靠移动动画
private OnTouchListener gonggaoOnTouch() { return new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: { break; } case MotionEvent.ACTION_UP: { if (mAdsV.getTop() == mSlipRl.getTop() && moveY < 0) { topTag(); } else if (moveY < -200) { topTag(); } else { nextTag(); } break; } } gestureDetector.onTouchEvent(event); return true; } private void topTag() { animBuilder.setDurationMillis(400).setFromYValue(formY) .setToYValue(mAdsV.getTop() - mSlipRl.getTop()); bgMoveAnim = animBuilder.build(); bgMoveAnim.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub mSlipRl.clearAnimation(); setLayout(mSlipRl, 0, mAdsV.getTop(), 0); mSlipRl.invalidate(); } }); mSlipRl.startAnimation(bgMoveAnim); } private void nextTag() { animBuilder.setDurationMillis(400).setFromYValue(formY) .setToYValue(mAdsV.getBottom() - mSlipRl.getTop()); bgMoveAnim = animBuilder.build(); bgMoveAnim.setAnimationListener(new AnimationListener() { @Override public void onAnimationStart(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationRepeat(Animation animation) { // TODO Auto-generated method stub } @Override public void onAnimationEnd(Animation animation) { // TODO Auto-generated method stub mSlipRl.clearAnimation(); setLayout(mSlipRl, 0, mAdsV.getBottom(), 0); mSlipRl.invalidate(); } }); mSlipRl.startAnimation(bgMoveAnim); } }; } 方法二，主要代码如下：
@Override public boolean dispatchTouchEvent(MotionEvent event) { // TODO Auto-generated method stub switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastY = event.getY(); if(null==mLocationSlip||null==mSlipDown||null==mSlipMove){ mLocationSlip = this.findViewById(R.id.location_slip); mSlipDown = this.findViewById(R.id.down_slip); mSlipMove = this.findViewById(R.id.move_slip); } top = mSlipMove.getTop(); bottom = mSlipDown.getBottom(); if (top <= lastY && lastY <= (bottom + top)) { isMove = true; return true; } case MotionEvent.ACTION_MOVE: if (isMove) { float newY = event.getY(); int ay = (int) ((lastY - newY) * 0.5); lastY = newY; mSlipMove.offsetTopAndBottom(-ay); } break; case MotionEvent.ACTION_UP: if (isMove) { isMove = false; top = mSlipMove.getTop(); System.out.println(top + "====" + bottom + "==="+ mLocationSlip.getBottom()*2/3); if(!location&&top<(mLocationSlip.getBottom()*2/3)){ setLayout(mSlipMove, 0, 0, 0); location=true; }else if(location&&top>(mLocationSlip.getBottom()*1/3)){ setLayout(mSlipMove, 0, mLocationSlip.getBottom(), 0); location=false; }else if(!location){ setLayout(mSlipMove, 0, mLocationSlip.getBottom(), 0); }else{ setLayout(mSlipMove, 0, 0, 0); } } break; } return super.dispatchTouchEvent(event); } 主要知识点，就是重新设置了View的位置，android 3.0之后View可以同setTop（），setLeft()等一系列方法直接设置位置方便了开发。3.0之前位置变化设置方法：
/** * 给view重置位置 * @param view * @param x * @param y * @param b */ public void setLayout(View view, int x, int y, int b) { MarginLayoutParams margin = new MarginLayoutParams( view.getLayoutParams()); margin.setMargins(x, y, 0, b); RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams( margin); view.setLayoutParams(layoutParams); } 文章涉及知识点不多，相信一看就懂。如有问题，留言
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