Android Cant get One TextView to animate to the position of another TextView

问题

Ok by the looks of it, this should be the easiest thing to do when it comes to animations. I have to do the following: I have place 2 TextViews and Random position of the screen. (For eg the first TextView is at top-left (0,0)) and the other TextView is at bottom right(width_of_screen, height_of_screen).

Now when I click on the bottom textView I want it to animate to the position of the top left textview. My Code is the following:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    txtOne = (TextView)findViewById(R.id.textone);
    txtTwo = (TextView)findViewById(R.id.text_two);
    relative = (RelativeLayout)findViewById(R.id.relative);


    txtTwo.setOnClickListener(new View.OnClickListener() {

        @SuppressLint("NewApi")
        @Override
        public void onClick(View v) {



            float to_x = txtOne.getX();
            float to_y = txtOne.getY();


            float x_from = txtTwo.getX();
            float y_from = txtTwo.getY();
            //txtTwo.getLocationInWindow(fromLoc);   
            txtOne.getLocationOnScreen(toLoc);
            Animations anim = new Animations();

            Animation a = anim.fromAtoB(x_from, y_from, -to_x, -to_y, animL,1000);
            txtTwo.startAnimation(a);

        }
    });
}



public class Animations {
    public Animation fromAtoB(float fromX, float fromY, float toX, float toY, AnimationListener l, int speed){


        Animation fromAtoB = new TranslateAnimation(

                fromX, 

                toX, 

                fromY, 

                toY
                );

        fromAtoB.setDuration(speed);
        //fromAtoB.setInterpolator(new );


        if(l != null)
            fromAtoB.setAnimationListener(l);               
        return fromAtoB;
    }
}



AnimationListener animL = new AnimationListener() {

    @Override
    public void onAnimationStart(Animation animation) {     
    }

    @Override
    public void onAnimationRepeat(Animation animation) {        
    }

    @Override
    public void onAnimationEnd(Animation animation) {
        //this is just a method to delete the ImageView and hide the animation Layout until we need it again.
        //clearAnimation();       
    }
};

The animations are weird. The bottom textView never animates to the top one. I really could use some help in this. Thanks.

回答1:

Ok I found the error in my code. If anyone is having problems then use this :

Animation a = anim.fromAtoB(0, 0, to_x-x_from, to_y - y_from, animL,1000);

instead of

 Animation a = anim.fromAtoB(x_from, y_from, -to_x, -to_y, animL,1000);

来源：https://stackoverflow.com/questions/18029097/android-cant-get-one-textview-to-animate-to-the-position-of-another-textview

标签

android

animation

textview

translation