Asked  7 Months ago    Answers:  5   Viewed   30 times

Let's say I have a vertical linearLayout with :

[v1]
[v2]

By default v1 has visibily = GONE. I would like to show v1 with an expand animation and push down v2 at the same time.

I tried something like this:

Animation a = new Animation()
{
    int initialHeight;

    @Override
    protected void applyTransformation(float interpolatedTime, Transformation t) {
        final int newHeight = (int)(initialHeight * interpolatedTime);
        v.getLayoutParams().height = newHeight;
        v.requestLayout();
    }

    @Override
    public void initialize(int width, int height, int parentWidth, int parentHeight) {
        super.initialize(width, height, parentWidth, parentHeight);
        initialHeight = height;
    }

    @Override
    public boolean willChangeBounds() {
        return true;
    }
};

But with this solution, I have a blink when the animation starts. I think it's caused by v1 displaying full size before the animation is applied.

With javascript, this is one line of jQuery! Any simple way to do this with android?

 Answers

27

I see that this question became popular so I post my actual solution. The main advantage is that you don't have to know the expanded height to apply the animation and once the view is expanded, it adapts height if content changes. It works great for me.

public static void expand(final View v) {
    int matchParentMeasureSpec = View.MeasureSpec.makeMeasureSpec(((View) v.getParent()).getWidth(), View.MeasureSpec.EXACTLY);
    int wrapContentMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED);
    v.measure(matchParentMeasureSpec, wrapContentMeasureSpec);
    final int targetHeight = v.getMeasuredHeight();

    // Older versions of android (pre API 21) cancel animations for views with a height of 0.
    v.getLayoutParams().height = 1;
    v.setVisibility(View.VISIBLE);
    Animation a = new Animation()
    {
        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            v.getLayoutParams().height = interpolatedTime == 1
                    ? LayoutParams.WRAP_CONTENT
                    : (int)(targetHeight * interpolatedTime);
            v.requestLayout();
        }

        @Override
        public boolean willChangeBounds() {
            return true;
        }
    };

    // Expansion speed of 1dp/ms
    a.setDuration((int)(targetHeight / v.getContext().getResources().getDisplayMetrics().density));
    v.startAnimation(a);
}

public static void collapse(final View v) {
    final int initialHeight = v.getMeasuredHeight();

    Animation a = new Animation()
    {
        @Override
        protected void applyTransformation(float interpolatedTime, Transformation t) {
            if(interpolatedTime == 1){
                v.setVisibility(View.GONE);
            }else{
                v.getLayoutParams().height = initialHeight - (int)(initialHeight * interpolatedTime);
                v.requestLayout();
            }
        }

        @Override
        public boolean willChangeBounds() {
            return true;
        }
    };

    // Collapse speed of 1dp/ms
    a.setDuration((int)(initialHeight / v.getContext().getResources().getDisplayMetrics().density));
    v.startAnimation(a);
}

As mentioned by @Jefferson in the comments, you can obtain a smoother animation by changing the duration (and hence the speed) of the animation. Currently, it has been set at a speed of 1dp/ms

Tuesday, June 1, 2021
 
Deyson
answered 7 Months ago
26

I have solved my issue and now my animation works fine :) if anyone needed just copy my code and xml file and have a happy coding :)

My Activity MainActivity:

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.view.animation.AnimationUtils;
import android.view.animation.TranslateAnimation;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.RelativeLayout;

public class MainActivity extends Activity {

RelativeLayout rl_footer;
ImageView iv_header;
boolean isBottom = true;
Button btn1;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    rl_footer = (RelativeLayout) findViewById(R.id.rl_footer);
    iv_header = (ImageView) findViewById(R.id.iv_up_arrow);
    iv_header.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            iv_header.setImageResource(R.drawable.down_arrow);
            iv_header.setPadding(0, 10, 0, 0); 
            rl_footer.setBackgroundResource(R.drawable.up_manu_bar);
            if (isBottom) {
                SlideToAbove();
                isBottom = false;
            } else {
                iv_header.setImageResource(R.drawable.up_arrow);
                iv_header.setPadding(0, 0, 0, 10);
                rl_footer.setBackgroundResource(R.drawable.down_manu_bar1);
                SlideToDown();
                isBottom = true;
            }

        }
    });

}

public void SlideToAbove() {
    Animation slide = null;
    slide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
            Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
            0.0f, Animation.RELATIVE_TO_SELF, -5.0f);

    slide.setDuration(400);
    slide.setFillAfter(true);
    slide.setFillEnabled(true);
    rl_footer.startAnimation(slide);

    slide.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {

            rl_footer.clearAnimation();

            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                    rl_footer.getWidth(), rl_footer.getHeight());
            // lp.setMargins(0, 0, 0, 0);
            lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
            rl_footer.setLayoutParams(lp);

        }

    });

}

public void SlideToDown() {
    Animation slide = null;
    slide = new TranslateAnimation(Animation.RELATIVE_TO_SELF, 0.0f,
            Animation.RELATIVE_TO_SELF, 0.0f, Animation.RELATIVE_TO_SELF,
            0.0f, Animation.RELATIVE_TO_SELF, 5.2f);

    slide.setDuration(400);
    slide.setFillAfter(true);
    slide.setFillEnabled(true);
    rl_footer.startAnimation(slide);

    slide.setAnimationListener(new AnimationListener() {

        @Override
        public void onAnimationStart(Animation animation) {

        }

        @Override
        public void onAnimationRepeat(Animation animation) {
        }

        @Override
        public void onAnimationEnd(Animation animation) {

            rl_footer.clearAnimation();

            RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                    rl_footer.getWidth(), rl_footer.getHeight());
            lp.setMargins(0, rl_footer.getWidth(), 0, 0);
            lp.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
            rl_footer.setLayoutParams(lp);

        }

    });

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

 }

and my Xml activity_main:

 <?xml version="1.0" encoding="utf-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:id="@+id/rl_main"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:background="@drawable/autograph_bg" >

 <RelativeLayout
    android:id="@+id/rl_footer"
    android:layout_width="fill_parent"
    android:layout_height="70dp"
    android:layout_alignParentBottom="true"
    android:background="@drawable/down_manu_bar1" >

    <ImageView
        android:id="@+id/iv_new_file"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="18dp"
        android:onClick="onNewFileClick"
        android:src="@drawable/file_icon" />

    <TextView
        android:id="@+id/tv_new_file"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_new_file"
        android:layout_below="@+id/iv_new_file"
        android:text="New"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_insert"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_new_file"
        android:layout_marginLeft="30dp"
        android:layout_toRightOf="@+id/iv_new_file"
        android:src="@drawable/insert_icon" />

    <TextView
        android:id="@+id/tv_insert"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_insert"
        android:layout_below="@+id/iv_insert"
        android:text="Insert"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_up_arrow"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:paddingBottom="10dp"
        android:src="@drawable/up_arrow" />

    <ImageView
        android:id="@+id/iv_down_arrow"
        android:layout_width="45dp"
        android:layout_height="45dp"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:background="@drawable/down_arrow"
        android:paddingBottom="10dp"
        android:visibility="gone" />

    <ImageView
        android:id="@+id/iv_save"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_insert"
        android:layout_marginLeft="30dp"
        android:layout_toRightOf="@+id/iv_up_arrow"
        android:src="@drawable/save" />

    <TextView
        android:id="@+id/tv_save"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/iv_save"
        android:layout_alignParentBottom="true"
        android:text="Save"
        android:textColor="#ffffff" />

    <ImageView
        android:id="@+id/iv_settings"
        android:layout_width="25dp"
        android:layout_height="25dp"
        android:layout_alignTop="@+id/iv_save"
        android:layout_marginLeft="27dp"
        android:layout_toRightOf="@+id/tv_save"
        android:paddingTop="2dp"
        android:src="@drawable/icon_settings" />

    <TextView
        android:id="@+id/tv_settings"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_marginLeft="260dp"
        android:text="Settings"
        android:textColor="#ffffff" />
 </RelativeLayout>

 </RelativeLayout>

just create new android project and copy paste my code and have fun! :) also remember in xml i have image view and his background images replace with yout own images thanks..

Wednesday, June 16, 2021
 
Vlad
answered 6 Months ago
37

As far as i know, thats a Bug in 2.1, 2.2

A possible workaround could be:

ImageView rocketImage = (ImageView) layout.findViewById(R.id.animation);
rocketImage.setBackgroundResource(R.drawable.progress_blue_animation);
rocketAnimation = (AnimationDrawable) rocketImage.getBackground();
rocketImage.post(new Runnable(){
    public void run(){
        rocketAnimation.start();
    }
});

(But i didn't try it in Targets >2.1)

Wednesday, August 4, 2021
 
user9824674
answered 4 Months ago
62

I just did animation.start() after the loop and called the function from a runnable and it worked

while (from <= to) {
    String name = "globe_" + String.format("%03d", from);
    int globeId = res.getIdentifier(name, "drawable",
            this.getPackageName());

    animation.addFrame(res.getDrawable(globeId), 200);
    from++;
}

globe.setBackgroundDrawable(animation);

animation.start()
Monday, August 9, 2021
 
Cilvic
answered 4 Months ago
30

Since there are no codes attached, I'm assuming you have some transition animation to the activity. If this is the case, it might cause the problem.Since there are two animations running simultaneously. Disable the transition and give it try.

startActivity(intent);
getActivity().overridePendingTransition(0, 0); 
Tuesday, September 28, 2021
 
TheTechnicalPaladin
answered 3 Months ago
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