昨天朋友项目中有个需求让我帮忙看看怎么搞，就跟去哪儿携程买机票时点中间按钮互换出发地和目的地的效果，当时一看觉得挺简单，用补间动画，在动画完成时设置给两边各textview互换值就好，做出来后发现效果不好，在最后互换值得时候会有闪烁，于是就用了一种较为麻烦的方法，不过效果是达到了，记录一下。gif效果不好。
内容
简单说下思路,在点击互换按钮后:
1、计算互换位置的需要的偏移量:
这里需要需要考虑的特殊地方就是左右两边有可能文字长度不一样,所以我在textview外面套了一层相对布局.画个图来说明吧.布局最外层是个水平的线性布局,中间一个button,两边各一个相对布局宽度0dp权重1,里面的textview宽度都是包裹内容的.
2、获取两侧textview的坐标及绘图缓存,创建镜像view,隐藏两侧的textview,这里直接看下面代码就好啦,需要注意的是Y坐标要减去状态栏高度.
3、隐藏两侧的textview,开启镜像view的属性动画,在结束时互换textview的值,显示出textview,移除镜像view,释放资源.
代码
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public class AddressActivity extends AppCompatActivity { private TextView mTvLeft; private TextView mTvRight; private Button mBtn; private RelativeLayout mRlLeft; private RelativeLayout mRlRight; private WindowManager mWindowManager; private int[] mLeftLocation; private int[] mRightLocation; private Bitmap mLeftCacheBitmap; private Bitmap mRightCacheBitmap; private LinearLayout mLl; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_address); mWindowManager = getWindowManager(); mTvLeft = (TextView) findViewById(R.id.tv_left); mTvRight = (TextView) findViewById(R.id.tv_right); mRlLeft = (RelativeLayout) findViewById(R.id.rl_left); mRlRight = (RelativeLayout) findViewById(R.id.rl_right); mLl = (LinearLayout) findViewById(R.id.ll); mBtn = (Button) findViewById(R.id.btn); mBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View view) { textAnim(); mBtn.setEnabled(false); } }); } /** * 左边tv的镜像view */ private ImageView copyViewLeft; /** * 右边tv的镜像view */ private ImageView copyViewRight; /** * 获取tv的属性,计算偏移量, */ private void textAnim() { //获取tv控件距离父控件的位置 int leftRight = mTvLeft.getRight(); int rightLeft = mTvRight.getLeft(); //包裹右侧tv距离父控件的距离 int rlRight = mRlRight.getRight(); int rlLeft = mRlRight.getLeft(); //在哪里设的padding就要用哪个控件来获取padding值 int paddingStart = mLl.getPaddingStart(); Log.d("AddressActivity", "paddingStart:" + paddingStart); //左侧textview需要移动的距离 int leftOffset = rlRight - leftRight - paddingStart; //右侧textview需要移动的距离 int rightOffset = rlLeft + rightLeft - paddingStart; //创建出镜像view createCopyView(); //隐藏掉两边的tv mTvLeft.setVisibility(View.INVISIBLE); mTvRight.setVisibility(View.INVISIBLE); //开启镜像view的动画 leftAnim(leftOffset,mLeftLocation[0]); rightAnim(rightOffset,mRightLocation[0]); } /** * 创建镜像view */ private void createCopyView(){ mLeftLocation = new int[2]; mRightLocation = new int[2]; //获取相对window的坐标 mTvLeft.getLocationInWindow(mLeftLocation); mTvRight.getLocationInWindow(mRightLocation); //获取左边tv的缓存bitmap mTvLeft.setDrawingCacheEnabled(true); mLeftCacheBitmap = Bitmap.createBitmap(mTvLeft.getDrawingCache()); mTvLeft.destroyDrawingCache(); //获取右边tv的缓存bitmap mTvRight.setDrawingCacheEnabled(true); mRightCacheBitmap = Bitmap.createBitmap(mTvRight.getDrawingCache()); mTvRight.destroyDrawingCache(); //创建出两个镜像view copyViewLeft = createCopyView(mLeftLocation[0], mLeftLocation[1], mLeftCacheBitmap); copyViewRight = createCopyView(mRightLocation[0], mRightLocation[1], mRightCacheBitmap); //释放bitmap资源...这我不确定是不是这么做 mLeftCacheBitmap = null; mRightCacheBitmap = null; } /** * 左侧镜像view的动画 * @param offset 偏移量 * @param defX 原始位置的x */ private void leftAnim(int offset, final int defX){ ValueAnimator leftAnimV = ValueAnimator.ofInt(0,offset); leftAnimV.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { int animatedValue = (int) valueAnimator.getAnimatedValue(); WindowManager.LayoutParams layoutParams = (WindowManager.LayoutParams) copyViewLeft.getLayoutParams(); //往右边移动所以x是变大的 layoutParams.x = defX + animatedValue; mWindowManager.updateViewLayout(copyViewLeft,layoutParams); } }); leftAnimV.setDuration(400); leftAnimV.start(); //左侧动画监听 leftAnimV.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { //改变值 String s = mTvLeft.getText().toString(); mTvLeft.setText(mTvRight.getText().toString()); mTvRight.setText(s); mTvLeft.setVisibility(View.VISIBLE); mWindowManager.removeView(copyViewLeft); copyViewLeft = null; mBtn.setEnabled(true); } }); } /** * 右侧镜像view动画 * @param offset 偏移量 * @param defX 原始位置的x */ private void rightAnim(int offset, final int defX){ ValueAnimator rightAnimV = ValueAnimator.ofInt(0,offset); rightAnimV.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() { @Override public void onAnimationUpdate(ValueAnimator valueAnimator) { int animatedValue = (int) valueAnimator.getAnimatedValue(); WindowManager.LayoutParams layoutParams = (WindowManager.LayoutParams) copyViewRight.getLayoutParams(); layoutParams.x = defX - animatedValue; mWindowManager.updateViewLayout(copyViewRight,layoutParams); } }); rightAnimV.setDuration(400); rightAnimV.start(); rightAnimV.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { mTvRight.setVisibility(View.VISIBLE); mWindowManager.removeView(copyViewRight); copyViewRight = null; } }); } /** * 创建镜像view * * @param x * @param y * @param bitmap */ private ImageView createCopyView(int x, int y, Bitmap bitmap) { WindowManager.LayoutParams mLayoutParams = new WindowManager.LayoutParams(); mLayoutParams.format = PixelFormat.TRANSLUCENT; //图片之外其他地方透明 mLayoutParams.gravity = Gravity.TOP | Gravity.LEFT; mLayoutParams.x = x; //设置imageView的原点 mLayoutParams.y = y - getStatusHeight(this); mLayoutParams.alpha = 1f; //设置透明度 mLayoutParams.width = WindowManager.LayoutParams.WRAP_CONTENT; mLayoutParams.height = WindowManager.LayoutParams.WRAP_CONTENT; mLayoutParams.flags = WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE; ImageView copyView = new ImageView(this); copyView = new ImageView(this); copyView.setImageBitmap(bitmap); mWindowManager.addView(copyView, mLayoutParams); //添加该iamgeView到window return copyView; } /** * 获取状态栏的高度 * @param context * @return */ private static int getStatusHeight(Context context) { int statusHeight = 0; Rect localRect = new Rect(); ((Activity) context).getWindow().getDecorView().getWindowVisibleDisplayFrame(localRect); statusHeight = localRect.top; if (0 == statusHeight) { Class<?> localClass; try { localClass = Class.forName("com.android.internal.R$dimen"); Object localObject = localClass.newInstance(); int i5 = Integer.parseInt(localClass.getField("status_bar_height").get(localObject).toString()); statusHeight = context.getResources().getDimensionPixelSize(i5); } catch (Exception e) { e.printStackTrace(); } } return statusHeight; }} |
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原文链接：https://blog.csdn.net/qq_36376387/article/details/60146291
