Develop Reference

android - start animating a view immediately

i am making an android app and i am a newbie in development.
I created a startup animation for the app, using the app icon that is scaled from O% size to 100% size and rotated at the same time. This works allright. But i have a problem with it. In xml, the view visibility is set to gone initially. In code, i call image.setVisibility(View.VISIBLE) and then image.startAnimation(iconAnimation) . But the result is that i can see a flash of the ImageView before it starts animating, for like half a second or so. You can see the gif.
Gif:
see the gif
Can you help me with this? Thanks in advance.
My code:
runOnUiThread(new Runnable() {
#Override
public void run() {
// here
image.setVisibility(View.VISIBLE);
image.startAnimation(imageAnim);
//also found this somewhere, didn't help.
image.invalidate();
}
});
Layout xml:
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="35sp"
android:text="Kytky"
android:layout_centerInParent="true"
android:id="#+id/welcome_text"
android:visibility="gone"/>
<ImageView
android:layout_width="200dp"
android:layout_height="200dp"
android:src="#mipmap/ic_launcher"
android:layout_centerInParent="true"
android:id="#+id/welcome_image"
android:visibility="gone"/>

You can use value animator instead, You can hack through the animation
imageView.setPivotX(viewCenterX);
imageView.setPivotY(viewCenterY);
imageView.setScaleX(0);
imageView.setScaleY(0);
final FloatEvaluator scaleEvaluator = new FloatEvaluator();
final FloatEvaluator rotationEvaluator = new FloatEvaluator();
ValueAnimator valueAnimator = ValueAnimator.ofFloat(0, 1f);
valueAnimator.setDuration(TimeUnit.SECONDS.toMillis(1));
valueAnimator.setInterpolator(new DecelerateInterpolator());
valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
float fraction = animation.getAnimatedFraction();
float scale = scaleEvaluator.evaluate(fraction, 0f, 1f);
float rotation = rotationEvaluator.evaluate(fraction, 0f, 360f);
imageView.setScale(scale);
imageView.setRotation(rotation);
}
});
valueAnimator.start();
Start one more animator or use this same animator to slide the logo up. Using this animators you will have full control over your animation.

you can switch the view visibility when the animations starts
imageAnim.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
image.setVisibility(View.VISIBLE);
}
#Override
public void onAnimationEnd(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
image.startAnimation(imageAnim);
the blink happens because the view visibility far from starting the animations, so in the first frame it will have its real size, and after that starts the animation

You need to work with alpha as well...make it visible and set alpha to minimum value than set alpha gradually to maximum value with in handler.

Create Cycle Tile effect on single image in android

I need to develop Cycle Tile effect on single image in android.
Cycle Tile windows 8 effect.
Reference app : Flava™ - Note/Journal , they are using Cycle Tile like effect in navigation drawer.
I tried with animations(fade in / fade out) but I think its different than Cycle Tile effect.
I searched on web but nothing find related to Cycle Tile with android.
Please help.

I created a small demo to give this effect.
What I did was, show animations of images one by one while drawer is opened.
Zoom animation was not required. I used TranslateAnimation only.
Here is the drawe layout code in xml file:
<LinearLayout
android:id="#+id/left_drawer_layout"
android:layout_width="240dp"
android:layout_height="match_parent"
android:layout_gravity="start"
android:orientation="vertical">
<ImageView
android:id="#+id/drawerImage"
android:contentDescription="#string/app_name"
android:layout_width="match_parent"
android:layout_height="140dip"
android:src="#drawable/ic_launcher"
android:adjustViewBounds="false"
android:cropToPadding="false"
android:scaleType ="centerCrop"
/>
<ListView
android:id="#+id/left_drawer"
android:layout_width="240dp"
android:layout_height="match_parent"
android:choiceMode="singleChoice"
android:divider="#android:color/transparent"
android:dividerHeight="0dp"
android:background="#111"/>
</LinearLayout>
Here's part of the java code:
//global initializations
private TypedArray imgs;
private int imageNumber = 0;
int x = 35;
int y = -35;
Animation animation;
//overriden method
public void onDrawerOpened(View drawerView) {
getActionBar().setTitle(mDrawerTitle);
invalidateOptionsMenu(); // creates call to onPrepareOptionsMenu()
showAnimatedImages();
}
//put in onCreate
imgs = getResources().obtainTypedArray(R.array.drawer_images);
//method to show animated images
public void showAnimatedImages(){
mDrawerImage.setImageResource(imgs.getResourceId(imageNumber, -1));
animation = new TranslateAnimation(x, y, x, y);
animation.setDuration(6000);
animation.setFillAfter(true);
mDrawerImage.startAnimation(animation);
animation.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub
}
#Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub
}
#Override
public void onAnimationEnd(Animation animation) {
System.out.println(imageNumber);
System.out.println(imgs.length());
// TODO Auto-generated method stub
if(imageNumber > imgs.length())
imageNumber = 0;
else
imageNumber = imageNumber+1;
int r = x;
x = y;
y = r;
showAnimatedImages();
}
});
}
I am interchanging the x and y integers in onAnimationEnd to reverse direction. That means, first animation will be shown from up left to bottom right, and second will be shown vice-verse. imageNumber is increased till it reaches the length of array of images. After that again its started from 0.
Let me know in case you have any doubt.
This is not as smooth as that application, but I hope it helps you get going :)

Need imagebutton clear before Animation commences

So I start my activity and then
setContentView(R.layout.myxmllayoutfile);
All is well, but I want to make my imagebutton suddenly grow (scale) from nothing (ie 1%). However the layout is already displaying the button so it suddenly disappears then grows back rather than growing from nothing.
I have some alternatives but is there a real solution?:
1. flying the imagebutton animate in from offscreen? ; or
2. making it tiny in the xml and then growing it, then if necessary changing the clickable area?; or
3. is there a better solution?
UPDATE:
As suggested I tried:
<ImageButton
android:id="#+id/spinner"
android:scaleType="fitXY"
android:layout_width="120dp"
android:layout_height="120dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:background="#drawable/clear"
android:orientation="horizontal"
android:visibility="invisible"
android:src="#drawable/spin"
/>
and in my java:
scaleView.startAnimation(scanimation);
ImageButton spinnerbutton=(ImageButton)findViewById(R.id.spinner);
spinnerbutton.setVisibility(View.VISIBLE);
but it is still visible before it shrinks to 1% then grows! Suggestions welcome.
UPDATE2:
Nothing has changed with the edited below code:
public void growit() {
final ImageView scaleView = (ImageView) findViewById(R.id.spinner);
Animation scanimation = AnimationUtils.loadAnimation(this, R.anim.throbbing2);
scanimation.setFillAfter(true);
scanimation.setAnimationListener(new Animation.AnimationListener() {
public void onAnimationStart(Animation a) { Log.e("growit", "---- animation start listener called");
scaleView.setVisibility(View.VISIBLE);
}
public void onAnimationRepeat(Animation a) {
}
public void onAnimationEnd(Animation a) {
}
});
scaleView.startAnimation(scanimation);
}

Make imagebutton hidden.
Then in your animation set Animation listener and on start animation callback method set the button visible
UPDATE:
Animation animation = new ScaleAnimation(0.0f, 1.0f, 0.0f, 1.0f);
animation.setAnimationListener(new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
mImageButton.setVisibility(View.VISIBLE);
}
#Override
public void onAnimationRepeat(Animation animation) { }
#Override
public void onAnimationEnd(Animation animation) { }
});
mImageButton.startAnimation(animation);

No permanent solution. Just used a workaround of making it tiny in the xml and then growing it as suggested in the question as a possible "solution"/workaround but not ideal.

clickable imageview location change with animation - android

I have an imageview that's included inside a RelativeLayout. When the imageview is clicked, I animate the entire RelativeLayout with a translate animation to move it down.
when I click the imageview again (in it's new location) it's supposed to move it back up, but it does not. However, if I click where the imageview started, it does move the entire "panel" back up. Why is the imageview not moving with the relativelayout...at least insofar as the clickability of it. The actual image is moving, but the spot where it's clickable is not.
here is my xml for the layout:
<RelativeLayout
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_width="fill_parent"
android:layout_height="120px"
android:layout_marginTop="-106px"
android:id="#+id/chatbox"
android:visibility="invisible">
<TextView
android:layout_width="fill_parent"
android:layout_height="106px"
android:background="#000000"
android:id="#+id/chattext" />
<ImageView
android:layout_width="20px"
android:layout_height="14px"
android:id="#+id/chatbubble"
android:layout_below="#id/chattext"
android:src="#drawable/chatbubble" />
</RelativeLayout>
Edit: I should add that I'm using Animation.setFillAfter(true) to hold the panel in place after the animation completes.

This is because animations actually do not affect views positions, they just draw them. So to handle click at new place you have to place something there (i.e. invisible FrameLayout). Or you can change your views margins on animation complete, so the views actually will move to the place.

I had the same problem and the best solution I found is to add an AnimationListener to your animation and move the view yourself in that listener as Konstantin Burov said :
animation.setFillAfter(false);
AnimationListener animListener = new AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationRepeat(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
RelativeLayout.LayoutParams relativeLayoutParams = (LayoutParams) yourView.getLayoutParams();
//To avoid the flicker
yourView.clearAnimation();
relativeLayoutParams.setMargins(0, 0, 0, Utils.dpToPx(activity, newPositionDp);
yourView.setLayoutParams(relativeLayoutParams);
}
};
animation.setAnimationListener(animListener);
The Utils.dpToPx may be useful too :
public final static int dpToPx(Context context, int dp) {
return ((int)((dp * context.getResources().getDisplayMetrics().density) + 0.5));
}

Blinking Text in android view

How do I display Blinking Text in android.
Thank you all.

Actually there is an Easter egg blink tag for this in ICS! :) I don't actually recommend using it - was REALLY amused to find it in the source, though!
<blink xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="I'm blinking"
/>
</blink>

Create a view animation for it. You can do an alpha fade from 100% to 0% in 0 seconds and back again on a cycle. That way, Android handles it inteligently and you don't have to mess arround with threading and waste CPU.
More on animations here:
http://developer.android.com/reference/android/view/animation/package-summary.html
Tutorial:
http://developerlife.com/tutorials/?p=343

Using Threads in your code always wastes CPU time and decreases performance of the application. You should not use threads all the time. Use if wherever neccessary.
Use XML Animations for this purpose :
R.anim.blink
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android">
<alpha android:fromAlpha="0.0"
android:toAlpha="1.0"
android:interpolator="#android:anim/accelerate_interpolator"
android:duration="600"
android:repeatMode="reverse"
android:repeatCount="infinite"/>
</set>
Blink Activity: use it like this :-
public class BlinkActivity extends Activity implements AnimationListener {
TextView txtMessage;
Button btnStart;
// Animation
Animation animBlink;
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_blink);
txtMessage = (TextView) findViewById(R.id.txtMessage);
btnStart = (Button) findViewById(R.id.btnStart);
// load the animation
animBlink = AnimationUtils.loadAnimation(getApplicationContext(),
R.anim.blink);
// set animation listener
animBlink.setAnimationListener(this);
// button click event
btnStart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
txtMessage.setVisibility(View.VISIBLE);
// start the animation
txtMessage.startAnimation(animBlink);
}
});
}
#Override
public void onAnimationEnd(Animation animation) {
// Take any action after completing the animation
// check for blink animation
if (animation == animBlink) {
}
}
#Override
public void onAnimationRepeat(Animation animation) {
}
#Override
public void onAnimationStart(Animation animation) {
}
}
Let me know if you have any queries..

It can be done by adding a ViewFlipper that alternates two TextViews and Fadein and Fadeout animation can be applied when they switch.
Layout File:
<ViewFlipper android:id="#+id/flipper" android:layout_width="fill_parent" android:layout_height="wrap_content" android:flipInterval="1000" >
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="TEXT THAT WILL BLINK"/>
<TextView android:layout_width="fill_parent" android:layout_height="wrap_content" android:gravity="center_horizontal" android:text="" />
</ViewFlipper>
Activity Code:
private ViewFlipper mFlipper;
mFlipper = ((ViewFlipper)findViewById(R.id.flipper));
mFlipper.startFlipping();
mFlipper.setInAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_in));
mFlipper.setOutAnimation(AnimationUtils.loadAnimation(getApplicationContext(), android.R.anim.fade_out));

public static void blinkText(TextView textView) {
Animation animation = new AlphaAnimation(1, 0); // Change alpha from fully visible to invisible
animation.setDuration(300); // duration - half a second
animation.setInterpolator(new LinearInterpolator()); // do not alter animation rate
animation.setRepeatCount(-1); // Repeat animation infinitely
animation.setRepeatMode(Animation.REVERSE); // Reverse animation at the end so the button will fade back in
textView.startAnimation(animation);
}
I can't remember where I found this but it is by far the best I've seen

If you want to make text blink on canvas in bitmap image so you can use this code
we have to create two methods
So first, let's declare a blink duration and a holder for our last update time:
private static final int BLINK_DURATION = 350; // 350 ms
private long lastUpdateTime = 0; private long blinkStart=0;
now create method
public void render(Canvas canvas) {
Paint paint = new Paint();
paint.setTextSize(40);
paint.setColor(Color.RED);
canvas.drawBitmap(back, width / 2 - back.getWidth() / 2, height / 2
- back.getHeight() / 2, null);
if (blink)
canvas.drawText(blinkText, width / 2, height / 2, paint);
}
Now create update method to blink
public void update() {
if (System.currentTimeMillis() - lastUpdateTime >= BLINK_DURATION
&& !blink) {
blink = true;
blinkStart = System.currentTimeMillis();
}
if (System.currentTimeMillis() - blinkStart >= 150 && blink) {
blink = false;
lastUpdateTime = System.currentTimeMillis();
}
}
Now it work fine

private bool _blink;
private string _initialtext;
private async void Blink()
{
_initialtext = _txtView.Text;
_txtView.Text = Resources.GetString(Resource.String.Speak_now);
while (VoiceRecognizerActive)
{
await Task.Delay(200);
_blink = !_blink;
Activity.RunOnUiThread(() =>
{
if (_blink)
_txtView.Visibility = ViewStates.Invisible;
else
_txtView.Visibility = ViewStates.Visible;
});
}
_txtView.Text = _initialtext;
_txtView.Visibility = ViewStates.Visible;
}
//this is for Xamarin android