Develop Reference

Why setPivotX() just replace views?

In code - after first part of animation pivot of view is changing and...view position too!(it is strange behavior)
Here's code(stipulation - one ValueAnimator):
ValueAnimator animator = ValueAnimator.ofFloat(0,180);
float firstAnimLineX = ((47.5f * Resources.getSystem().getDisplayMetrics().density));
float firstAnimLineY = ((2.5f * Resources.getSystem().getDisplayMetrics().density));
float secondAnimLineX = ((47.5f * Resources.getSystem().getDisplayMetrics().density));
float secondAnimLineY = ((47.5f * Resources.getSystem().getDisplayMetrics().density));
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
#Override
public void onAnimationUpdate(ValueAnimator animation) {
view.setPivotX((Float) animator.getAnimatedValue()>180/2?firstAnimLineX : secondAnimLineX);
view.setPivotY((Float) animator.getAnimatedValue()>180/2?firstAnimLineY : secondAnimLineY);
view.setRotation((Float) animator.getAnimatedValue());
}
});
XML file:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<FrameLayout
android:layout_width="50dp"
android:layout_height="50dp"
android:id="#+id/frameLayout">
<ImageView
android:layout_width="50dp"
android:layout_height="5dp"
android:layout_gravity="center_horizontal"
android:id="#+id/line"
/>
</FrameLayout>
</RelativeLayout>
And here is what i want to do(left part; right part - it's what realy happens)(yellow point - pivot):
I watched source code of setPivotX but it doesn't says me anything.
Maybe i should call someone of invalidate-methods of view?

I recreated this code and ran it on my Android phone. It gives the exact animation you are looking for.
I created an Image to match your 'match-stick' image.
I made it 400 px wide by 40 high for an example.
I gave it the id: 'bar'
ImageView bar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
bar = findViewById(R.id.bar);
bar.getLayoutParams().width = 400; // I set the dimensions here.
bar.getLayoutParams().height = 40; // I set the dimensions here.
bar.setX(0); bar.setY(0); // Then I positioned it in upper left corner.
bar.setPivotX(380); // I set the pivot a little inside the image so that it looks kinda like it is pivoting on a nail.
bar.setPivotY(20);
bar.animate().rotation(-90).setDuration(2000); // Here it animates from your first image above, to your second image in 2 seconds.
// Here I used a postDelay to allow the first animation to finish its' 2 seconds 'before' calling the second animation. No need for an animate() - listener now.
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
bar.setY(360); // This re-positions the original image to the
// location where the animation ended.
bar.setRotation(90); // Because the original image was horizontal, this turns it vertical.
// Now we finish the animation to your 3rd image above.
bar.animate().rotation(0).setDuration(2000);
}
},2100);
}

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.

image animation on screen

I am trying to make an app where in the first screen, an image (name of the app) flies into the background, and gets fixed into a certain location. I am new to android and would appreciate any help.
I have tried using setAnimationListener():
public class Pageone extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_main);
final ImageView imageView=(ImageView)findViewById(R.id.image);
Animation anim1 = new TranslateAnimation(0, 0, 1024, 824);
anim1.setDuration(3000);
anim1.setFillAfter(true);
anim1.setAnimationListener(new Animation.AnimationListener() {
#Override
public void onAnimationStart(Animation animation) {
}
#Override
public void onAnimationEnd(Animation animation) {
Animation anim2 = new TranslateAnimation(0, 0, 824, 1024);
anim2.setDuration(3000);
anim2.setFillAfter(true);
imageView.clearAnimation();
imageView.startAnimation(anim2);
}
#Override
public void onAnimationRepeat(Animation animation) {
}
});
imageView.startAnimation(anim1);
}
}
and the xml page as -
<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:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
tools:context="com.example.meeting.MainActivity$PlaceholderFragment"
android:background="#drawable/tapregister" >
<ImageView
android:id="#+id/image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:src="#drawable/meet"
/>
</RelativeLayout>'
While running the app in android virtual device manager, I find the image fixed as seen in the layout section.

You don't need two animations to do what you want. You just need one animation that moves your ImageView from Bottom to the center of the screen.
So, drop your anim1.setAnimationListener() code. Change the Ydelta values to start in position Y+300 (for example) and end in position Y+0 (your layout original position). This will place your ImageView on the screen bottom, 300 px below your initial position and move it to the center, this is, to your layout initial position. Like this:
final ImageView imageView=(ImageView)findViewById(R.id.image);
Animation anim1 = new TranslateAnimation(0,0,300,0);
anim1.setDuration(3000);
anim1.setFillAfter(true);
imageView.startAnimation(anim1);

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