android实现携程购票起始点位置交换

<?xml version="1.0" encoding="utf-8"? 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:fitsSystemWindows="true"
  android:orientation="horizontal" 

  <TextView
    android:id="@+id/left_tv"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="center"
    android:text="北京" / 

  <Button
    android:id="@+id/btn"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="center"
    android:text="交换位置" / 

  <TextView
    android:id="@+id/right_tv"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:gravity="center"
    android:text="深圳" / 

</LinearLayout 

public class TESTButtonActivity extends AppCompatActivity {
private int startX;
private int endX;
private TextView leftCityTextView;
private TextView rightCityTextView;
private ValueAnimator endCityAnimator;
private ValueAnimator startCityAnimation;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_button);
leftCityTextView = ((TextView) this.findViewById(R.id.left_tv));
rightCityTextView = ((TextView) this.findViewById(R.id.right_tv));
Button mBtn = ((Button) this.findViewById(R.id.btn));
mBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startCityAnimation.start();
endCityAnimator.start();
}
});
}
private void getLocation() {
int[] startXLocation = new int[2];
leftCityTextView.getLocationOnScreen(startXLocation);//获取坐标
int[] endXLocation = new int[2];
rightCityTextView.getLocationOnScreen(endXLocation);
startX = startXLocation[0];//0为x坐标
endX = endXLocation[0];
}
@Override
public void onWindowFocusChanged(boolean hasFocus) {
super.onWindowFocusChanged(hasFocus);
getLocation();
int leftMoveX = endX - startX;
int rightMoveX = endX - startX;
startCityAnimation = ValueAnimator.ofInt(0, leftMoveX).setDuration(5000);
startCityAnimation.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int value = (int) animation.getAnimatedValue();
//重新布局
leftCityTextView.layout(startX + value,
leftCityTextView.getTop(),
startX + value + leftCityTextView.getWidth(),
leftCityTextView.getBottom());
}
});
endCityAnimator = ValueAnimator.ofInt(0, rightMoveX).setDuration(5000);
endCityAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
int value = (int) animation.getAnimatedValue();
//重新布局
rightCityTextView.layout(endX - value,
rightCityTextView.getTop(),
endX + rightCityTextView.getWidth() - value,
rightCityTextView.getBottom());
}
});
endCityAnimator.addListener(new Animator.AnimatorListener() {
@Override
public void onAnimationStart(Animator animation) {
}
@Override
public void onAnimationEnd(Animator animation) {
//用于下次交换
TextView tempTextView = leftCityTextView;
leftCityTextView = rightCityTextView;
rightCityTextView = tempTextView;
}
@Override
public void onAnimationCancel(Animator animation) {
}
@Override
public void onAnimationRepeat(Animator animation) {
}
});
}
}