Android实现去哪儿携程地址互换效果

发布时间：2020-08-19 23:20:25

来源：脚本之家

阅读：106

作者：xinyang_code

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

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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