I want the ability to allow the user to choose an image from the gallery,
but only images were taken, for example, 10 minutes ago (maybe using Time Created Metadata?).
There are examples of how to open gallery and choose an image:
Intent i = new Intent(Intent.ACTION_PICK,
android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI);
startActivityForResult(i, RESULT_LOAD_IMAGE);
However, I only need images which were taken 10 minutes ago.
Does anyone have an idea?
I might be wrong but I don't think you can achieve this directly by using the Intent.ACTION_PICK into the Gallery. I think, there is a possible way with MediaStore.Images.ImageColumns.DATE_TAKEN and a Cursor as you can see in this answer. However, I did not find the right way to do it.
Then, you can do a workaround: create your own Gallery into your app. Select all the pictures from the Camera folder, filter them, and display only which are taken x min ago into your own Gallery - a simple GridView. I think this might be easy to do:
Init the vars:
// FileArray
private File[] aFile;
// ArrayList
private ArrayList<String> aImagePath = new ArrayList<String>();
Get the DCIM Camera folder:
File fPath = new File(Environment
.getExternalStorageDirectory().toString() + "/DCIM/Camera");
Create a FileArray and list the files in this folder:
// use a FilenameFilter to have only the pictures in JPG
aFile = fPath.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
return name.toLowerCase().endsWith(".jpg");
}
});
For each file, get the last modified date and populate an ArrayList<String>:
for(int i=0; i < aFile.length; i++) {
long lastDate = aFile[i].lastModified(); // get last modified date
long nowTime = nDate.getTime(); // get the current time to compare
if(nowTime - lastDate < 600*1000) { // if less than 10 min
String pathFile = aFile[i].getPath();
aImagePath.add(pathFile); // populate the Array
}
}
Finally, reverse the Array to have the most recent pictures at the first place and display them:
if(aImagePath.size() != 0) {
Collections.reverse(aImagePath); // reverse the Array
// Call an AsyncTask to create and retrieve each Bitmap
// then, in onPostExecute(), populate the Adapter of the GridView
} else {
// No pictures taken 10 min ago!
}
Actually, in the AsyncTask, you will have to deal with the Bitmap options to save memory... I tested this in a GridView into a Fragment and it worked well. You can find the references I used above:
Using File.listFiles with FileNameExtensionFilter
How to get a file's creation date?
Get File Creation Time
How to display selected image gallery in ImageView?
Maybe someone has a better solution, but this above does the trick and displays only the images taken 10 min ago with the Camera's device. I hope this will help you.
Related
I am writing an app that generates Maths worksheets for school students. It will, for example, generate 2 to 5 pages of simple Maths questions and 1 to 2 pages of answers. The PDF can be saved to file and loaded again later. Then it has a print function that can print all the pages. I want to make it skip printing the answer pages.
Is it possible to automatically identify which pages are the answer pages? I can only think of a workaround by making those answer pages have special height or width but not even sure if this works. Are there any better ways to do this?
Ok, I continued the project and used the following method: when constructing the PDF, I put the word "Answer on the top left corner with a gray rectangle surrounding it drawn with drawRect(). Then before the actual printing, I used the following code inside the PrintDocumentAdapter() class to check whether the color of the pixel 0,0 is gray or not.
#Override
public void onStart() {
if (parcelFileDescriptor != null) {
try {
pdfRenderer = new PdfRenderer(parcelFileDescriptor);
} catch (IOException e) {
e.printStackTrace();
}
}
int tempTotal = pdfRenderer.getPageCount();
Bitmap[] tempBitmap = new Bitmap[tempTotal];
finalTotal = tempTotal;
for (int pageNum = 0; pageNum < tempTotal; pageNum++) {
PdfRenderer.Page tempPage = pdfRenderer.openPage(pageNum);
tempBitmap[pageNum] = Bitmap.createBitmap(WS_WIDTH, WS_HEIGHT, Bitmap.Config.ARGB_8888);
tempPage.render(tempBitmap[pageNum], null, null, PdfRenderer.Page.RENDER_MODE_FOR_PRINT);
if (tempBitmap[pageNum].getPixel(0, 0) == Color.GRAY) {
finalTotal--;
}
tempPage.close();
}
}
It works fine. At least should cause no problem if the users only attempt to print PDF files constructed with my app. :P
Please tell me if you know a better way to do this. Thanks!
I am currently creating a map which updates based on users selection and displays 5 location closest to them. This works however when the user changes their selection the map updates and displays the 5 NEW locations as well as the 5 OLD locations.
I am not sure how to remove the old symbols.
public void displayResults(ArrayList allLocation) {
SymbolManager sm = new SymbolManager(mapView,map,styleMap);
sm.deleteAll();
SymList.clear();
sm.setIconAllowOverlap(true);
sm.setIconIgnorePlacement(true);
int count = 1;
for (LocationDetails a : allLocation
) {
// gets the distance from user to Location
double LocationLat = Double.parseDouble(a.getLatitude());
double LocationLng = Double.parseDouble(a.getLongitude());
float[] disResult = new float[1];
Location.distanceBetween(lat, lng, LocationLat, LocationLng, disResult);
results.append(count + ": " + a.getName() + " " + "\n");
distanceResults.append(Math.round(disResult[0]) + "m" + "\n");
SymbolOptions symbolOptions = new SymbolOptions()
.withLatLng(new LatLng(LocationLat, LocationLng))
.withIconImage("marker-11")
.withTextField(""+count)
.withIconColor("black")
.withIconSize(2.5f);
SymList.add(symbolOptions);
count++;
}
LatLngBounds latLngBounds = new LatLngBounds.Builder()
.include(SymList.get(0).getLatLng())
.include(SymList.get(1).getLatLng())
.include(SymList.get(2).getLatLng())
.include(SymList.get(3).getLatLng())
.include(SymList.get(4).getLatLng())
.build();
map.animateCamera(CameraUpdateFactory.newLatLngBounds(latLngBounds, 50), 2000);
for(SymbolOptions a : SymList){
sm.create(a);
}
SymList.clear();
}
I have been using mapbox for 3 months. After hours of research I discovered that on Android the only way to remove a Symbol or any element on the map was to reload all the elements from scratch. Unfortunately, there is currently no method to remove a single element.
So I suggest you create a container class in which to save your items.
If your use case only requires showing about five markers on the map at a time, it might be easier to use native sources and SymbolLayers rather than relying on the abstraction provided by the SymbolManager.
For example, this icon updates based on API response Android demo shows how to add a GeoJSON source and corresponding layer to the map, then update said source to get a different visual result. Basically all of the logic you will need is encapsulated here, but your GeoJSON will be a FeatureCollection of multiple (namely, 5) features rather than just one point.
So, you can set up your symbols similarly to how it's done in the linked example:
private void initSpaceStationSymbolLayer(#NonNull Style style) {
style.addImage("space-station-icon-id",
BitmapFactory.decodeResource(
this.getResources(), R.drawable.iss));
style.addSource(new GeoJsonSource("source-id"));
style.addLayer(new SymbolLayer("layer-id", "source-id").withProperties(
iconImage("space-station-icon-id"),
iconIgnorePlacement(true),
iconAllowOverlap(true),
iconSize(.7f)
));
}
, and then update the source's GeoJSON to the new locations closest to the user's position, similar to the updateMarkerPostion method:
private void updateMarkerPosition(LatLng position) {
// This method is where we update the marker position once we have new coordinates. First we
// check if this is the first time we are executing this handler, the best way to do this is
// check if marker is null;
if (map.getStyle() != null) {
GeoJsonSource spaceStationSource = map.getStyle().getSourceAs("source-id");
if (spaceStationSource != null) {
spaceStationSource.setGeoJson(FeatureCollection.fromFeature(
Feature.fromGeometry(Point.fromLngLat(position.getLongitude(), position.getLatitude()))));
}
}
// Lastly, animate the camera to the new position so the user
// wont have to search for the marker and then return.
map.animateCamera(CameraUpdateFactory.newLatLng(position));
}
A few modifications will need to be made, of course, but this option might be more direct for your implementation specifically.
I am making a simple sequence from randomly generated numbers. Each number will show an image linked to it.
for example,
the value 1 will show a picture of a cat.
value 2 a dog
and value 3 a mouse.
Each image has it's own dedicated imageview, the layout looks like this by default, i.e image views that store black until it's number is called:
Each time the sequence increments. so on the second run two images will show, on the third 3 will show and so on.
The problem I am having is that all the images show at once. So for sequence one just the one image flashes (which is what I want). but on the second run both images show at once together instead of showing the first image then the second.
So to clarify let's say on the four runs the stored array is 1,2,3,3 I would want
image 1 to show, and disappear.then
image 2 show and disappear. then
image 3 show and disappear
and then image 3 to show and disappear.
But what I actually get is on the fourth run 1,2&3 will show at once and disappear at the same time together. How can I break this up to achieve what I want. I have tried many methods and the same result happens. I can't get my head around this problem.
Here is my code:
ArrayList<Integer> stored_vals = new ArrayList<Integer>();
public void Gen() {
int i=0 ;
Random rand = new Random();
int rndInt = rand.nextInt(3)+ 1 ;
list.add(rndInt);
int totalElements = list.size();
Log.d("LOOK", Integer.toString(rndInt));
Log.i("VALUE LIST ", list.toString()+" <<<<LIST HERE");
while(i < totalElements) {
retval =list.get(i);
Log.d("RETVAL", Integer.toString(retval));
String imgName = "flash" + retval;
int id = getResources().getIdentifier(imgName, "drawable", getPackageName());
if (retval==1){
Cat.setImageResource(id);
Reset_View();
}
else if (retval==2){
Dog.setImageResource(id);
Reset_View();
}
else if (retval==3){
Mouse.setImageResource(id);
Reset_View();
}
i++;
}
}
To try and delay the images showing at one at a time and to reset to it's default after showing for a few seconds I call Reset_View(); which is the following code:
CountDownTimer Reset_View = new CountDownTimer(1000 , 0010){
public void onTick(long millisUntilFinished) {
}
public void onFinish() {
Centre.setImageResource(R.drawable.i1);
upperRight.setImageResource(R.drawable.i2);
lowerRight.setImageResource(R.drawable.i3);
lowerLeft.setImageResource(R.drawable.i4);
upperLeft.setImageResource(R.drawable.i5);
}
};
So how can I achieve what I want. I have been stuck on this idea for weeks.
This is a high level idea of what you could do.
Put all the showing and hiding in the countdowntimer. So basically you would need to handle the 'onTick' and hide or show the images when needed. Something like 'time > 0 and < 1000' hide all but the first image. 1000 to 2000, show only second image. 2000 to 3000, show only third image. On finish, hide all.
When you instantiate the timer after the for loop, if retval is 1 - then 1000 would be how long to run, retval = 2, then 2000, retval = 3, then 3000.
There is probably a better way to do it but this is the first thing that comes to my mind.
One problem might be that Reset_View(); is not a method. The line even states public CLASS Reset_View(); extends CountDownTimer. ( I don't know ho that can be a valid class name but whatever) Therefore, calling Reset_View(); will not actually do anything.
You need to change the name of the class to something else, I suggest ResetTimer. Then to reset the Views you must create an instance of ResetTimer and use its start() method like this:
new ResetTimer(1000, 1000).start();
Note: the first number in the constructor is the total time (in milliseconds) until the timers onFinish() is called. The second one it the time between the onTick()s. Since you don't use this method, the number you put in there doesn't matter.
I am developing a chat application, where i have implemented image sending. So without the images everything works fine. But now I'm facing issues in displaying the images that are sent / received. For that what i've done is downloaded the image first and saved it in external storage. My idea was simple fetch the bitmap set it in an imageview on the getView method. Nothing wrong with fetching the image and displaying but listview ruins everthing.
This is my code-
ListView getView()
ViewHolder holder = null;
if(convertView == null ){
convertView = inflater.inflate(R.layout.chat_list, null);
holder = new ViewHolder();
holder.mMsg = (TextView) convertView.findViewById(R.id.text);
holder.mDate = (TextView) convertView.findViewById(R.id.text1);
holder.mLinLay=(LinearLayout) convertView.findViewById(R.id.linSide1);
holder.mRelLay=(RelativeLayout) convertView.findViewById(R.id.relSide);
holder.img=(ImageView)convertView.findViewById(R.id.image);
holder.progCircle=(ProgressBar)convertView.findViewById(R.id.pbHeaderProgress);
convertView.setTag(holder);
} else{
holder = (ViewHolder) convertView.getTag();
}
holder.position=position;
holder.img.setTag(position+"img");
HashMap<String, String> hm = list.get(position);
String date=hm.get("date");
long l = Long.parseLong(date);
long unixTime = System.currentTimeMillis();
CharSequence datedate=DateUtils.getRelativeTimeSpanString(l, unixTime, 1);
String status = hm.get("status");
String who = hm.get("who");
if(hm.get("message").contains("[[pic_message]]"))
{
String picName=hm.get("message").replace("[[pic_message]]", "");
final String picPath1=Environment.getExternalStorageDirectory()+"/App/sent_pics/"+picName+".jpg";
File file = new File(picPath);
if(file.exists())
{
new AsyncTask<ViewHolder, Void, Bitmap>() {
private ViewHolder v;
Bitmap bm;
#Override
protected Bitmap doInBackground(ViewHolder... params) {
v = params[0];
bm = decodeSampledBitmapFromResource(picPath1,100,100);
return bm;
}
#Override
protected void onPostExecute(Bitmap result) {
super.onPostExecute(result);
if (v.img.getTag().equals(position+"img")) {
v.img.setImageBitmap(result);
}
}
}.execute(holder);
}else{
holder.img.setImageBitmap(null);
}
}else{
holder.img.setImageBitmap(null);
Spannable msg =getSmiledText(getApplicationContext(),hm.get("message"));
holder.mMsg.setText(msg);
}
holder.mDate.setText(datedate);
return convertView;
What the problem is-
The listview shows up, but the images are displayed at random listview items. I searched a lot for this kind of problem, tried them but still no luck. The asyntask code is from Google- Use A Background Thread.. As you see from above i didn't set any holder.mMsg.setText(msg); but still whenever the images are shown they are accompanied by a msg, which is not desirable. Also the scrolling is kindda laggy when the images are shown. I have seen many messaging apps, they all run so smoothly, and the items are never mixed up. So what do they use.Also, while googling this problem, one answer suggested that we should remove the converView if else and then everything will be fine. But that will have performance issues which i don't want.
So my question is what should i do? How do the chat apps like, hangouts,bbm,whatsapp achieve this so smoothly?
EDIT
The pictures are displayed with no problem but the main problem is that they are diplayed at random orders.
Like this- i scroll till the image message, they are displayed. Then I again scroll and now the image is displayed in other listview item. My guess is that the same view(which originallly holds the image) is now being used by other, but the image stays there. How can i fix that ? And make the listview smooth (even with images) like the IM apps?
It's because Android ListView reuses Views, so while your Asynctask execute the donInBackground the user is already doing something else and you code don't know anything about it. (So it will put the image)
I would use Picasso to avoid the problem and let someone else handle your problem.
I handled this problem in my application (a contact phone) using:
A cache, to avoid to send multiple requests for the same image even when i already have in memory his image
I send a WeakReference<> to the Asynctask so when it's done check if the ImageView is still valid and put the bitmap inside it. Update the cache.
(Specific to me) Since sometimes i could happen that a contact don't have a photo i just created another List with all users without a photo (so i don't try to download it)
Everytime a .getview is called check if the image is inside the cache and if it's inside the cache put directly it, or start the asynctask.
Bitmap bitmap = cache.get(number);
if (bitmap == null) {
Log.d(TAG, "I will download image for " + name + ".");
// i set a dummy image to avoid to show the wrong picture
holder.contactPhoto.setImageResource(R.drawable.ic_action_person);
loadUserProfilePhoto(number, holder.contactPhoto);
}
else {
// show it directly
Log.d(TAG, "I already have " + name + " in cache.");
holder.contactPhoto.setImageBitmap(bitmap);
}
If you see, it could happen that it shows another picture instead of the user-photo while it's still loading it so i set a dummy picture instead of the old photo.
It's not the best implementation, but it's to show you that it could be very hard to implement it by yourself and do it right.
Read Picasso documentation and see how it could implement it in your code (it's simple, it's just one line.)
The issue is with listview which continuously keep refreshing it.
So your all code is fine, but just set default image in holder.img instead of making it null holder.img.setImageBitmap(null);
And may be in async too, you need set default_image while your image is being loaded.
If you want display images on the fly I think you should use SurfaceView. It is a lot faster and has a higher refresh rate. I made a video streaming application where I tried to display each video frame on the ImageView but that failed. But when I tried out SurfaceVIew it worked out fine.
I've managed to add an image into a JPanel in netbeans and display it.I wonder how to get to the next one,by pressing a button.
I've added the image using this code:
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt){
// TODO add your handling code here:
JFileChooser fileChooser = new JFileChooser();
int result = fileChooser.showOpenDialog(null);
if ( result == JFileChooser.APPROVE_OPTION ){
String Ruta = fileChooser.getSelectedFile().getAbsolutePath();
jTextField1.setText(Ruta);
Icon icon = new ImageIcon(Ruta);
jLabel2.setIcon(icon);
JOptionPane.showMessageDialog(this,"You chose to open this file: " +
fileChooser.getSelectedFile().getName());
}
}
And when i press a button called "jButton2" to get the next image,without manually selecting it again from folder.
For example:
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt){
// TODO add your handling code here:
}
Thank You very much.
You have to enumerate images in the directory you are browsing in. When the user selects the file, you should keep a list of all images from that directory in order to retrieve them when user click the next button. As well you can get the file list whenever the user clicks the next button.
maybe something like this:
private File allFiles;
private int currentIndex;
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
JFileChooser fileChooser = new JFileChooser();
int result = fileChooser.showOpenDialog(null);
if ( result == JFileChooser.APPROVE_OPTION ){
currentFile = fileChooser.getSelectedFile();
String Ruta = currentFile.getAbsolutePath();
jTextField1.setText(Ruta);
allFiles = currentFile.getParent().listFiles(); // maybe you need a filter to include image files only....
currentIndex = indexOf(allFiles, currentFile);
Icon icon = new ImageIcon(Ruta);
jLabel2.setIcon(icon);
JOptionPane.showMessageDialog(this,"You chose to open this file: " + fileChooser.getSelectedFile().getName());
}
}
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
if (currentIndex+1 < allFiles.length) {
jtextField1.setText(allFiles[++currentIndex]);
}
}
private int indexOf(File[] files, File f) {
for (int i=0; i+1 < files.length; i++) {
if (files[i].equals(f)) {
return i;
}
}
return -1;
}
Get the parent file if the current image (File.getParent()).
Use one of the File.list..() methods to get the image files.
Sort them into some order that means 'next' to the user.
Iterate that connection until you find the current File then display the next one after that.
I am assuming that you want the next image, if possible in the same directory you chose in your first code excerpt. What you could do is that once the user has chosen the image, you could use Apache's FileUtils to get the extension of files. If the file is a JPG, JPEG, PNG, etc you could load it's location in a List of strings.
This will give you a list of picture paths. You could then use the buttons to traverse the list. Once the button is pressed, you move to the next item, load the image and render it.
EDIT: This is how I would go about it step by step:
Create a global variable of type List.
Create a global variable which will act as a counter;
In your jButton1ActionPerformed method:
Get the parent directory of the file that the user has chosen;
Use Apache's FileUtil class to get the extension of the file names. If the file name is an image, such as PNG, JPG, etc, add it (the path of that file) to your list.
In you jButton2ActionPerformed, increment the counter (if the counter is not smaller than the size of your list, re-initialize it to 0, so as to avoid OutOfBoundsExceptions) and load the the file denoted by the counter using similar logic to your jButton1ActionPerformed method.