Move imageview after animation (update position)

问题:

I am trying to to do a translate animation on an image view from the bottom to the middle of the screen. Upon finish of the animation, I want the image view to stay there. I dont want the setFillAfter(true) because I want the actual position of the imageview to be updated.

I do it currently by having 2 image view (one at the start of animation and one at the end) and I play with the setVisibility to achieve this. Is this the correct way to do things? Here is the code I used:

<ImageView
    android:id="@+id/ivStart"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:background="@drawable/typer_step_1"
    android:gravity="center"
     />



<ImageView
    android:id="@+id/ivMiddle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:background="@drawable/typer_step_1"
    android:gravity="center"
    android:visibility="invisible"
     />    








     TranslateAnimation translate = new TranslateAnimation(0, mDestLoc1[0]-mSrcLoc1[0], 0, mDestLoc1[1]-mSrcLoc1[1]);                   
translate.setDuration(2000);
translate.setAnimationListener(new AnimationListener(){

    @Override
    public void onAnimationStart(Animation animation) {}

    @Override
    public void onAnimationEnd(Animation animation) {
        ivMiddle.setVisibility(View.VISIBLE)
                        ivStart.setVisibility(View.INVISIBLE)


    }

    @Override
    public void onAnimationRepeat(Animation animation) {}

});

ivStart.startAnimation(translate);

回答1:

Then you must set new LayoutParams for your View which is animating. When animation finishes, in your onAnimationEnd part, set new position of your View.

     TranslateAnimation translate = new TranslateAnimation(0, mDestLoc1[0]-mSrcLoc1[0], 0, mDestLoc1[1]-mSrcLoc1[1]);                   
     translate.setDuration(2000);
     translate.setAnimationListener(new AnimationListener(){

         @Override
         public void onAnimationStart(Animation animation) {}

         @Override
         public void onAnimationEnd(Animation animation) {
             RelativeLayout.LayoutParams par = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
             par.topMargin = mDestLoc1[1]-mSrcLoc1[1];
             par.leftMargin = mDestLoc1[0]-mSrcLoc1[0];
             view.setLayoutParams(par);              
         }

         @Override
         public void onAnimationRepeat(Animation animation) {}

     });

     view.startAnimation(translate);

回答2:

Snake use my code this ll help you,

//Call this in your onCreate

 private void StartAnimationsDtoU() 
{
    Animation anim = AnimationUtils.loadAnimation(this, R.anim.alphadtou);
    anim.reset();
    RelativeLayout l=(RelativeLayout) findViewById(R.id.lin_lay);
    l.clearAnimation();
    l.startAnimation(anim);
    anim = AnimationUtils.loadAnimation(this, R.anim.translate);
    anim.reset();
    ImageView iv = (ImageView) findViewById(R.id.logo);
    iv.setImageResource(R.drawable.earth);
    iv.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
    iv.clearAnimation();
    iv.startAnimation(anim);

}

This is your linear layout with an image which ll move from down to middle of the screen.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/lin_lay">

<ImageView
    android:id="@+id/logo"
    android:layout_width="130dp"
    android:layout_height="130dp"
    android:layout_centerHorizontal="true"
    android:layout_centerVertical="true"
    android:background="@drawable/earth" />

and this ll be your xml file for translation i.e translate.xml ...

<set xmlns:android="http://schemas.android.com/apk/res/android"><translate
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXDelta="0%"
android:toXDelta="0%"
android:fromYDelta="200%"
android:toYDelta="0%"
android:duration="4000"
android:zAdjustment="top" /></set>

and this ll be your down to up alphadtou.xml...

<?xml version="1.0" encoding="utf-8"?><alpha
xmlns:android="http://schemas.android.com/apk/res/android"
android:fromAlpha="0.0"
android:toAlpha="1.0"
android:duration="1000" />

and also override onAttachedToWindow method like this...

@Override
public void onAttachedToWindow()
{
    // TODO Auto-generated method stub
    super.onAttachedToWindow();
    Window window = getWindow();
    window.setFormat(PixelFormat.RGBA_8888);
}

Hope this ll help you alot.

回答3:

If you want the actual starting position of the image view you can get it at the time of animationStart And you can use setFillAfter(true). The setFillAfter(true) will update the position after the animation end.

If you need the new position you can use the setFilter(true). If you are not ready to use setFillAfter(true) (if you need the older position), then you have done the right thing by having two Image Views. But its better to get the position in animationStart and use setFillAfter(true).

回答4:

Add this line before starting the animation translate.setFillAfter(true);