Slideshow option in the Phimpme Android Application
The Phimpme Android application along with all the basic features for viewing and sharing images also has some interesting functions, for example, the ability to view all the images at once using the slideshow option. The users can also manage the time duration for which a particular photo will be displayed before switching on to the next image. In this post, we will be discussing how we have achieved this functionality in the Phimpme Android application.
Step 1
First, we have to provide the user with an option to enter the time duration for which they want to view a particular photo. For this, we have made use of the themed dialog box which will take the input from the user and then we will be converting the time entered by them into milliseconds. This can be done by using the following code snippet.
dialog.setButton(DialogInterface.BUTTON_POSITIVE, getString(R.string.ok).toUpperCase(), new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
String value= editTextTimeInterval.getText().toString();
if(!"".equals(value))
{
slideshow=true;
int intValue = Integer.parseInt(value);
SLIDE_SHOW_INTERVAL = intValue * 1000;
Step 2
For changing the photo at a particular duration of time, we need to make use of the Runnable interface in Java, which uses a method run() to execute the tasks. To use it, we have to create a Handler object and initialize it. This can be done using the following lines of the code.
private Handler handler; handler = new Handler();
After this, we have to define and initialize our Runnable object which will be used later to change the picture. The code snippet for initializing the runnable object is given below.
Runnable slideShowRunnable = new Runnable() {
@Override
public void run() {
try{
mViewPager.scrollToPosition((getAlbum().getCurrentMediaIndex() + 1) % getAlbum().getMedia().size());
}
catch (Exception e) {
e.printStackTrace();
}
finally{
handler.postDelayed(this, SLIDE_SHOW_INTERVAL);
}
As the run() method gets executed, the scrollToPosition function of the ViewPager class gets called which changes the position of the image displayed to the next image available.
Step 3
To call the runnable object we created in the second step, we have to use the postDelayed function of the Handler class which takes in a Runnable object and the time in milliseconds as the parameter. The code snippet for this is provided below.
handler.postDelayed(this, SLIDE_SHOW_INTERVAL);
Please note that we have also included the above line of code in the finally block after each successful run of the method because as the slideshow starts, we will have to call this function to scroll to the new position after every finite provided duration.
This is how we have achieved the Slideshow functionality in the Phimpme Android application. To get the full source code for this implementation, please check out the Phimpme Android GitHub repository listed in the resources section below.
Resources
- GitHub – Phimpme Android Repository – https://github.com/fossasia/phimpme-android/
- Android Developer Guide – Handler class – https://developer.android.com/reference/android/os/Handler.html
- StackOverflow – Runnable in Java – https://stackoverflow.com/questions/13327571/in-a-simple-to-understand-explanation-what-is-runnable-in-java
- StackOverflow – Image Slideshow in Android – https://stackoverflow.com/questions/2995145/image-slideshow-example-in-android
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