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) {      }    });  }}