Develop Reference

How do I change alpha of an image view multiple times using thread.sleep?

I am trying to create an animation for my game. I am trying to make an animation of a coin flip that will stop under certain conditions.
So far I have tried to change an image view multiple times within one method and using thread.sleep to delay the transition between the pictures.
Using 12 different images I am now trying to make it so the alpha of the first image will set to 0 and the second image will set to one, the the second image will set to 0 and the third will set to 1, etc...
The way I am currently trying to do it is by putting images inside of an array of ImageViews and then calling them sequentially.
setContentView(R.layout.coin_flip_screen);
for(int i = 0; i < 4; i++){
headsTails[i].animate().alpha(0).setDuration(100);
headsTails[i+1].animate().alpha(1).setDuration(100);
try {
Thread.sleep(100);
} catch (Exception e) {
}
}

final int size = imageView.length;
final int animTime = 300;
final Handler animationHandler = new Handler();
Runnable animationRunnable = new Runnable() {
int i = 0;
#Override
public void run() {
if(i == size-1){
animationHandler.removeCallbacks(this);
return;
}
imageView[i++].animate().alpha(0f).setDuration(animTime).start();
imageView[i].animate().alpha(1f).setDuration(animTime).start();
animationHandler.postDelayed(this, animTime);
}
};
animationHandler.post(animationRunnable);
This code will iterate through all your imageviews in the array and stop itself once all the images are consumed.
Play along with your animTime variable until you get the perfect animation effect. Ideally it should be around 300 to 500 ms.
I will personally not use array of imageviews to create this effect as
it will eat up the memory. There are many more efficient ways to do
the coin flip animation, which you can google when you get time.

This should fix it
headsTails[i].animate().alpha(0).setDuration(100).start();

How to make each ImageView of list to start animation one by one?

I'm new to Android and I have 9 ImageViews that I want to make transparent. I'm using AlphaAnimation to make them fade. They fade indeed but I want to make them fade one by one. Unfortunately they all fade together and I don't know why.
I tried to use various ways to do it(including CountDownTimer,Thread.sleep(),new Handler().postDelayed()), but there is no change. All of the ImageViews fade simultaneously, not one by one. I know they are capable of doing it because animation on one works, but iteration throught list of this views ends up with all of them being animated at the same time.
Important methods(I guess):
private void fadeImageTiles(List<ImageView> ivs) {
Collections.shuffle(ivs);
for (ImageView iv : ivs) {
//maybe there's problem with iteration?
gradientFade(iv);
}
}
private void gradientFade(ImageView iv){
AlphaAnimation animation = new AlphaAnimation(1f,0f);
animation.setDuration(2000);
iv.startAnimation(animation);
iv.setVisibility(View.INVISIBLE);
}
Final effect is to make them fade randomly revealing image behind

You can use void setStartOffset (long startOffset) to specify after how many milliseconds the view should be animated.
For example:
private void fadeImageTiles(List<ImageView> ivs) {
Collections.shuffle(ivs);
for (int i = 0; i < ivs.size(); i++) {
//maybe there's problem with iteration?
gradientFade(ivs.get(i), i);
}
}
private void gradientFade(ImageView iv, int index){
AlphaAnimation animation = new AlphaAnimation(1f,0f);
animation.setDuration(2000);
animation.setStartOffset(index * 500);
iv.startAnimation(animation);
iv.setVisibility(View.INVISIBLE);
}
Or you can use ViewPropertyAnimator without writing much code. Replace your code inside your gradientFade method with this:
iv.animate().alpha(0).setDuration(2000).setStartDelay(index * 500);

Program exported from processing 3.1.1 not working on android device

I have make a video player which split the monitor with one side the image captured by the attached camera and the other side a video clip. It operates without error under java mode. When I run the program under android mode, processing reports no error but the sketch is not running on my phone, a pop up window which says
unfortunately, (sketch name) has stopped
shows up.
My code as below.
import processing.video.*;
Movie myMovie;
Capture cam;
void setup() {
size(displayWidth, displayHeight);
myMovie = new Movie(this,"new cctv.mp4");
myMovie.loop();
myMovie.mask(myMovie);
String[] cameras = Capture.list();
if (cameras.length == 0) {
println("There are no cameras available for capture.");
exit();
} else {
println("Available cameras:");
for (int i = 0; i < cameras.length; i++) {
println(i,cameras[i]);
}
cam = new Capture(this,cameras[0]);
cam.start();
}
}
void draw() {
if(cam.available()){
cam.read();}
image(cam, 0, 0, displayWidth, displayHeight);
image(myMovie, width/2, 0,displayWidth/2,displayHeight);
}
void movieEvent(Movie m){
m.read();
}

Time to start debugging your code.
The first thing you should try is hooking this up to LogCat so you can actually see the stack trace. Do that right now, as that's going to answer 95% of your question.
If that doesn't give you any information, then I guess you'll have to start adding print statements to see where your code fails.
I am suspicious of this line:
void setup() {
size(displayWidth, displayHeight);
It's generally a bad idea to pass variables into the size() function, especially if you aren't using the settings() function.
I'm also suspicious of the libraries you're importing. Are you sure they work in Android mode? Not all Java libraries automatically work for Android.

Can't play gif when using freeTTS Voices - Java

I am using freeTTS to speak out some text, in the background i want a animated gif to keep playing
When i try this: as soon as the voice starts speaking, the image in background gets hanged even if i keep it in some other JFrame... and after the speech is completed it starts moving. I want it to run properly without pauses.
I am placing a animated gif in a label by importing it to my application and changing the icon to that image in label' properties.
Edit
Here is my code:
private void RandomjBActionPerformed(java.awt.event.ActionEvent evt) {
Voice voice;
voice = voiceManager.getVoice(VOICENAME);
voice.allocate();
voice.speak("Daksh");
}
I am actually using a lot of setVisible, setText, declaration of integers, calculating on them but i have removed them to simplify the code for you to understand. Still it gives the same problem if executed.
The button 'RandomjB' is clicked from another button by the following code:
final Timer timer = new Timer(zad, new ActionListener() {
int tick = 0;
#Override
public void actionPerformed(ActionEvent e) {
System.out.println("Success" + ++tick);
RandomjB.doClick();
final int col = Integer.parseInt(t3.getText());;
if (tick >= col) {
((Timer) e.getSource()).stop();
for(int g=0; g<col; g++){
jButton2.setVisible(true); // Check Button -> Visible
}
}
}
});
timer.setInitialDelay(0);
System.out.format("About to schedule task.%n");
timer.start();
System.out.format("Task scheduled.%n");

It is hard to tell without the code, I however assume that you loop the speech synthesis within the one and only Swing-Thread and therefore block all kind of window updates as long as the speech loop is in progress.
As stated by Shaun Wild: you need to use a second Thread for the speech loop.

You may want to do some research on Threads and Concurrency
These allow two things to operate simultaneously, this is just my assumption.
Assuming that you instantiate some kind of class for the FreeTTS you may want to do something like this
FreeTTSClass tts;
new Thread(new Runnable(){
public void run(){
tts = new FreeTTSClass();
}
}).start();

Face detection not working for Front Camera

So basically, i have this code,
if(mCamera.getParameters().getMaxNumDetectedFaces()==0)
{
System.out.println("Face detection not avaliable");
}
else
{
System.out.println("Max faces: " + Integer.toString(mCamera.getParameters().getMaxNumDetectedFaces()));
}
mCamera.setFaceDetectionListener(new FaceDetectionListener() {
#Override
public void onFaceDetection(Face[] faces, Camera camera) {
// TODO Auto-generated method stub
System.out.println("Face detection callback called." + Integer.toString(faces.length));
}
});
After calling mCamera.startFaceDetection();, the callback is called, everything works as normal. However, if I change cameras, the same code results in the callback never being called. The getMaxNumDetectedFaces, returns 35 for both cameras, so I assume its supported on the front camera. I can change the camera back and forth, calling this code each time, and it will work for the back camera but not the front one.
Is there anything else I might be doing wrong?

Is it possible that the quality of the camera that's not working (the front one, right?) Isn't accurate enough for the face detection to work? The camera's image may be too noisy for the face detector to work. There are lot of other variables that could be hindering this.
Also doing a search for front camera, it looks like the front camera's points may be mirrored. This is described in: http://developer.android.com/reference/android/hardware/Camera.Face.html
I hope this helps.

Is there a way to check if the camera is being read? Java has always had some issues in registering web cams etc.... Perhaps try to make sure you can see images with the webcam.
Btw, if you want any further help, we will need to know more about the code. library etc....

This code will return the id of your Front facing camera, for others you can change camera.CameraInfo:
private int findFrontFacingCamera() {
int cameraId = -1;
// Search for the front facing camera
int numberOfCameras = Camera.getNumberOfCameras();
for (int i = 0; i < numberOfCameras; i++) {
Camera.CameraInfo info = new Camera.CameraInfo();
Camera.getCameraInfo(i, info);
if (info.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
Log.d("FaceDetector", "Camera found");
cameraId = i;
break;
}
}
return cameraId;
}
I had the code which worked on my Gallaxy tablet but it wouldnt call the take foto and as a result wouldnt call face detection in other devices, so after searching for a while I found this solution which worked. I added the following code in the class where takePicture is called :
camera.startPreview();

You can use Webcame for capturing image from webcam. it automatically detects webcam so no need to extra configuration for webcam. it also support more than one webcam at a time.