Compressing Images in Resolution in Phimpme Android Application

In the Phimpme Android application, users can perform various operations on images such as editing an image, sharing an image, moving the image to another folder, printing a pdf version of the image and many more. However, another important functionality that has been implemented is the option to compress an image. Two modes of compress operation have been implemented namely compress by size and compress by dimensions. In the previous blog post I discussed the implementation of compress by size operation. So in this blog post, I will be discussing how we achieved the functionality to compress any image by resolution.

Step 1

First, we need to add an option in the bottombar menu(in the SingleMediaActivity) to compress the image being viewed. The option to compress an image has been added by implementing the following lines of code in the  menu_bottom_view_pager.xml file.

<item
      android:id=“@+id/action_compress”
      android:orderInCategory=“2”
      app:showAsAction=“always”
      android:icon=“@drawable/compressicn”
      android:title=“Compress”/>

Step 2

Now on selecting the compress option, the user would be prompted to choose the compress mode i.e compress by size or compress by dimension. Once the user opts for compressing the image by resolution, a dialog containing the various resolutions options to choose from is to be displayed. Code snippets used to implement the dialog along with seekbar is displayed below.

<android.support.v7.widget.CardView
  xmlns:android=“http://schemas.android.com/apk/res/android”
  xmlns:app=“http://schemas.android.com/apk/vn.mbm.phimp.me”
  android:layout_width=“match_parent”
  android:layout_height=“wrap_content”
  app:cardCornerRadius=“2dp”
  android:id=“@+id/dialog_chose_provider_title”>
  <LinearLayout
      android:layout_width=“match_parent”
      android:layout_height=“wrap_content”
      android:orientation=“vertical”>

      <TextView
          android:id=“@+id/compress_title”
          android:layout_width=“match_parent”
          android:layout_height=“wrap_content”
          android:padding=“24dp”
          android:text=“@string/compress_by_dimension”
          android:textColor=“@color/md_dark_primary_text”
          android:textSize=“18sp”
          android:textStyle=“bold” />

      <ListView
          android:id=“@+id/listview”
          android:layout_width=“match_parent”
          android:layout_height=“321dp”
          android:layout_alignParentStart=“true”
          android:layout_centerVertical=“true”/>

  </LinearLayout>
</android.support.v7.widget.CardView>

A screenshot displaying the resolutions option dialog is provided below.

Step 3

Now in this final step as mentioned for the compress by size post, we would use the image compression library Compressor to obtain the compress by resolution functionality. After the user has specified the new resolution required, the Compressor class of the library is instantiated by passing-in the context as the parameter and some of its functions are invoked simaltaneously. The functions invoked are setMaxWidth(), setMaxHeight(),  setCompressFormat(), setDestinationDirectoryPath(), compressToFile().

setMaxWidth() – to set the width of the output image.

setMaxHeight() – to set the height of the output image.

setCompressFormat(Bitmap.CompressFormat) – to determine the format of the output compressed image.

setDestinationDirectoryPath(File) – to specify the path to which the compressed image is to be saved.

compressToFile(File) – to perform the compress operation, passing-in the file object of the corresponding image to be compressed.

The compressToFile() function performs the final compress operation and saves the compressed image to the specified path.

Code snippets to implement the above mentioned operations are given below

private void compressDim() {
  ListCompressAdapter lviewAdapter;
  ArrayList<String> compress_option= new ArrayList<String>();
  MediaDetailsMap<String,String> mediaDetailsMap = SingleMediaActivity.mediacompress.getMainDetails(this);
  //gives in the form like 1632×1224 (2.0 MP) , getting width and height of it
  String dim[]=mediaDetailsMap.get(“Resolution”).split(“x”);
  int  width= Integer.parseInt(dim[0].replaceAll(” “,“”));
  String ht[]=dim[1].split(” “);
  int height= Integer.parseInt(ht[0]);
  LayoutInflater inflater = getLayoutInflater();
  final View dialogLayout = inflater.inflate(R.layout.dialog_compresspixel, null);
  TextView title = (TextView) dialogLayout.findViewById(R.id.compress_title);
  title.setBackgroundColor(getPrimaryColor());
  //create options of compress in dimensions in multiple of 2
  int awidth=width;
  int aheight=height;
  ListView listView = (ListView)dialogLayout.findViewById(R.id.listview);
  while ((width%2==0)&&(height%2==0)) {
      compress_option.add(width + ” X “ + height);
      width=width/2;
      height=height/2;
  }

  lviewAdapter = new ListCompressAdapter(this, compress_option);
  listView.setAdapter(lviewAdapter);
  final int finalWidth = awidth;
  final int finalHeight = aheight;
  listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
      @Override
      public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
          if (position==0){
              cwidth[0] = finalWidth ;
              cheight[0] = finalHeight;}
          else{
              cwidth[0] = finalWidth /(position*2);
              cheight[0] = finalHeight /(position*2);}
          view.setBackgroundColor(R.color.md_light_blue_A400);
          new SaveCompressedImage().execute(“Resolution”);
          finish();
      }
  });
new Compressor(getApplicationContext())
      .setMaxWidth(cwidth[0])
      .setMaxHeight(cheight[0])
      .setCompressFormat(Bitmap.CompressFormat.JPEG)
      .setDestinationDirectoryPath( FileUtilsCompress.createFolders().getPath())
      .compressToFile(new File(saveFilePath));

This is how we have implemented the functionality to compress an image by size in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android Github repository listed in the resource section below.

Resources

  1. Android Developer documentation –https://developer.android.com/reference/java/io/File
  2. Github-Phimpme Android Repository – https://github.com/fossasia/phimpme-android/
  3. Compressor Library – https://github.com/zetbaitsu/Compressor

 

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Compress Images Size in Phimpme Android application

In the Phimpme Android application, users can perform various operations on images such as editing an image, sharing an image, moving the image to another folder, printing a pdf version of the image and many more. However, another important functionality that has been implemented is the option to compress an image. Two modes of compress operation have been implemented namely compress by size and compress by dimensions. So in this blog post, I will be discussing how we achieved the functionality to compress any image by size.

Step 1

First, we need to add an option in the bottom bar menu(in the SingleMediaActivity) to compress the image being viewed. The option to compress an image has been added by implementing the following lines of code in the  menu_bottom_view_pager.xml file.

<item
      android:id=“@+id/action_compress”
      android:orderInCategory=“2”
      app:showAsAction=“always”
      android:icon=“@drawable/compressicn”
      android:title=“Compress”/>

Step 2

Now on selecting the compress option, the user would be prompted to choose the compress mode i.e compress by size or compress by dimension. Once the user has opted for the size mode a dialog with a seekbar to set the compress percentage is to be displayed. Code snippets used to implement the dialog along with seekbar is displayed below.

<RelativeLayout
  android:layout_width=“wrap_content”
  android:layout_height=“wrap_content”
  android:layout_marginTop=“8dp”>

  <SeekBar
      android:id=“@+id/seekBar”
      android:layout_width=“match_parent”
      android:layout_height=“wrap_content”
      android:layout_weight=“0.65”
      android:max=“90”
      android:progressBackgroundTint=“@color/colorPrimary”
      android:thumb=“@drawable/ic_location_on_black_24dp” />

  <TextView
      android:id=“@+id/textview2”
      android:layout_width=“wrap_content”
      android:layout_height=“wrap_content”
      android:layout_alignParentEnd=“true”
      android:layout_below=“@+id/seekBar”
      android:layout_marginBottom=“5dp”
      android:layout_marginEnd=“16dp”
      android:text=“95%”
      android:textAppearance=“@style/TextAppearance.AppCompat.Body1”
      android:textSize=“16sp” />
</RelativeLayout>

A screenshot displaying the dialog to set the compress percentage is provided below

Step 3

Here to obtain the compress functionality we have used an open-sourced custom image compression library Compressor. After the user has set the compress percentage, the Compressor class of the library is instantiated by passing-in the context as the parameter and some of its functions are invoked simultaneously. The functions invoked are setQuality(), setCompressFormat(), setDestinationDirectoryPath(), compressToFile().

setQuality(int) – to set the percentage compressed.

setCompressFormat(Bitmap.CompressFormat) – to determine the format of the output compressed image.

setDestinationDirectoryPath(File) – to specify the path to which the compressed image is to be saved.

compressToFile(File) – to perform the compress operation, passing-in the file object of the corresponding image to be compressed.

The compressToFile() function performs the final compress operation and saves the compressed image to the specified path.

Code snippets to implement the above-mentioned operations are given below

private void compressSize() {

  LayoutInflater inflater = getLayoutInflater();
  View dialogLayout = inflater.inflate(R.layout.dialog_compresssize, null);
  TextView title = (TextView) dialogLayout.findViewById(R.id.compress_title);
  title.setBackgroundColor(getPrimaryColor());
  SeekBar percentsize = (SeekBar) dialogLayout.findViewById(R.id.seekBar);
  percentsize.getThumb().setColorFilter(getAccentColor(), PorterDuff.Mode.SRC_IN);
  percentsize.setProgress(0);
  final TextView percent=(TextView)dialogLayout.findViewById(R.id.textview2);
  percentsize.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      @Override
      public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
          //options of compress by size from 5% to 9;
          int progress1=95-progress;
          progress1=progress1-progress1%5;
          percent.setText(progress1+“%”);
          percentagecompress=progress1;}

      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {
          //do nothing
      }

      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {
          //do nothing
      }
  });}
new Compressor(getApplicationContext())
.setQuality(percentagecompress)
.setCompressFormat(Bitmap.CompressFormat.JPEG)
.setDestinationDirectoryPath(FileUtilsCompress.createFolders().getPath())
.compressToFile(new File(saveFilePath));

This is how we have implemented the functionality to compress an image by size in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android Github repository.

Resources

  1. Android Developer documentation –https://developer.android.com/reference/java/io/File
  2. Compressor Library – https://github.com/zetbaitsu/Compressor
  3. Seekbar Tutorial – https://abhiandroid.com/ui/seekbar
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Option to Rename an Image in Phimpme Android Application

In the Phimpme Android application, users can perform various operations on images such as editing an image, sharing an image, moving the image to another folder, printing a pdf version of the image and many more. However, another important functionality that has been implemented is the option to rename an image. So in this blog post, I will be discussing how we achieved the functionality to rename an image.

Step 1

First, we need to add an option in the overflow menu to rename the image being viewed. The option to rename an image has been added by implementing the following lines of code in the  menu_view_pager.xml file.

<item
  android:id=“@+id/rename_photo”
  app:showAsAction=“never”
  android:title=“@string/Rename”/>

Step 2

Now after the user chooses the option to rename any image from the overflow menu, an alert dialog with an edittext would be displayed to the user with the old name and provide the user to add a new name for the photo. The dialog box with edittext has been implemented with the following lines of XML code.

<android.support.v7.widget.CardView
  android:layout_width=“match_parent”
  android:layout_height=“wrap_content”
  app:cardCornerRadius=“2dp”
  android:id=“@+id/description_dialog_card”>
  <ScrollView
      android:layout_width=“match_parent”
      android:layout_height=“match_parent”>
      <LinearLayout
          android:layout_width=“match_parent”
          android:layout_height=“wrap_content”
          android:orientation=“vertical”>
          <TextView
              android:id=“@+id/description_dialog_title”
              android:layout_width=“match_parent”
              android:textColor=“@color/md_dark_primary_text”
              android:layout_height=“wrap_content”
              android:background=“@color/md_dark_appbar”
              android:padding=“24dp”
              android:text=“@string/type_description”
              android:textSize=“18sp”
              android:textStyle=“bold” />
          <LinearLayout
              android:id=“@+id/rl_description_dialog”
              android:layout_width=“match_parent”
              android:layout_height=“wrap_content”
              android:orientation=“horizontal”
              android:padding=“15dp”>
              <EditText
                  android:id=“@+id/description_edittxt”
                  android:layout_width=“fill_parent”
                  android:layout_height=“wrap_content”
                  android:padding=“15dp”
                  android:hint=“@string/description_hint”
                  android:textColorHint=“@color/grey”
                  android:layout_margin=“20dp”
                  android:gravity=“top|left”
                  android:inputType=“textCapSentences|textMultiLine”
                  android:maxLength=“2000”
                  android:maxLines=“4”
                  android:selectAllOnFocus=“true”/>
              <ImageButton
                  android:layout_width=“@dimen/mic_image”
                  android:layout_height=“@dimen/mic_image”
                  android:layout_alignRight=“@+id/description_edittxt”
                  app2:srcCompat=“@drawable/ic_mic_black”
                  android:layout_gravity=“center”
                  android:background=“@color/transparent”
                  android:paddingEnd=“10dp”
                  android:paddingTop=“12dp”
                  android:id=“@+id/voice_input”/>
          </LinearLayout>
      </LinearLayout>
  </ScrollView>
</android.support.v7.widget.CardView>

The screenshot displaying the dialog with edittext is provided below.

Step 3

Now after retrieving the new name entered by the user for the photo we would extract the extension of the old name which can be .jpg, .png etc. Thereafter we’d need to create a new File object passing in the new path of the image(the path folder remains the same only the image name gets changed to a new one) as the constructor parameter. Now using the renameTo method of the File class the old image file can be renamed. However, with this rename operation the image reference would not be automatically updated in the MediaStore database. So we’d need to delete the old file path from the Android system MediaStore database which keeps a URI reference to all the media files present on the device. At last, we’d need to invoke the MediaScanner class to scan all the media files so that the new file path of the renamed image is scanned and is picked up by the MediaStore database. This can be done with the help of an action intent to initiate the media scan action. The code changes implemented to perform the above-mentioned operation is given below.

public void onClick(View dialog) {
      if (editTextNewName.length() != 0) {
          int index = file.getPath().lastIndexOf(“/”);
          String path = file.getPath().substring(0, index);
          File newname = new File(path + “/” + editTextNewName.getText().toString() + “.” +
                  imageextension);
          if(file.renameTo(newname)){
              ContentResolver resolver = getApplicationContext().getContentResolver();
              resolver.delete(
                      MediaStore.Images.Media.EXTERNAL_CONTENT_URI, MediaStore.Images.Media.DATA +
                              “=?”, new String[] { file.getAbsolutePath() });
              Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
              intent.setData(Uri.fromFile(newname));
              getApplicationContext().sendBroadcast(intent);
          }
          if(!allPhotoMode){
              int a = getAlbum().getCurrentMediaIndex();
              getAlbum().getMedia(a).setPath(newname.getPath());
          }else {
              listAll.get(current_image_pos).setPath(newname.getPath());
          }
          renameDialog.dismiss();
          SnackBarHandler.showWithBottomMargin(parentView, getString(R.string.rename_succes), navigationView
                  .getHeight());
      } else {
          SnackBarHandler.showWithBottomMargin(parentView, getString(R.string.insert_something),
                  navigationView.getHeight());
          editTextNewName.requestFocus();
      }
  }
});

This is how we have implemented the functionality to rename an image in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android Github repository listed in the resource section below.

Resources

1.Android Developer documentation-https://developer.android.com/reference/java/io/File

2.Github-Phimpme Android Repository – https://github.com/fossasia/phimpme-android/

3.Renaming a file in java – http://stacktips.com/tutorials/java/how-to-delete-and-rename-a-file-in-java

 

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Option to add description to an image in the Phimpme Android app

In the Phimpme Android application, users can perform various operations on images such as editing an image, sharing an image, moving the image to another folder, printing a pdf version of the image and many more. However, another important functionality that has been implemented is the option to add some description to the image. So in this blog post, I will be discussing how we achieved the functionality to add a description to any image.

Step 1

First, we need to add an option in the overflow menu to add description for the image being viewed. The option to add description to an image has been achieved by adding the following lines of code in the  menu_view_pager.xml file.

<item
  android:id=“@+id/action_description”
  android:title=“Description”
  app:showAsAction=“never” />

Step 2

Now after the user chooses the option to add description to the image, an alertdialog with an edittext would be displayed to the user to enter the description. The dialog box with edittext has been implemented with the following lines of XML code.

<android.support.v7.widget.CardView
  android:layout_width=“match_parent”
  android:layout_height=“wrap_content”
  app:cardCornerRadius=“2dp”
  android:id=“@+id/description_dialog_card”>
  <ScrollView
      android:layout_width=“match_parent”
      android:layout_height=“match_parent”>
      <LinearLayout
          android:layout_width=“match_parent”
          android:layout_height=“wrap_content”
          android:orientation=“vertical”>
          <TextView
              android:id=“@+id/description_dialog_title”
              android:layout_width=“match_parent”
              android:textColor=“@color/md_dark_primary_text”
              android:layout_height=“wrap_content”
              android:background=“@color/md_dark_appbar”
              android:padding=“24dp”
              android:text=“@string/type_description”
              android:textSize=“18sp”
              android:textStyle=“bold” />
          <LinearLayout
              android:id=“@+id/rl_description_dialog”
              android:layout_width=“match_parent”
              android:layout_height=“wrap_content”
              android:orientation=“horizontal”
              android:padding=“15dp”>
              <EditText
                  android:id=“@+id/description_edittxt”
                  android:layout_width=“fill_parent”
                  android:layout_height=“wrap_content”
                  android:padding=“15dp”
                  android:hint=“@string/description_hint”
                  android:textColorHint=“@color/grey”
                  android:layout_margin=“20dp”
                  android:gravity=“top|left”
                  android:inputType=“textCapSentences|textMultiLine”
                  android:maxLength=“2000”
                  android:maxLines=“4”
                  android:selectAllOnFocus=“true”/>
              <ImageButton
                  android:layout_width=“@dimen/mic_image”
                  android:layout_height=“@dimen/mic_image”
                  android:layout_alignRight=“@+id/description_edittxt”
                  app2:srcCompat=“@drawable/ic_mic_black”
                  android:layout_gravity=“center”
                  android:background=“@color/transparent”
                  android:paddingEnd=“10dp”
                  android:paddingTop=“12dp”
                  android:id=“@+id/voice_input”/>
          </LinearLayout>
      </LinearLayout>
  </ScrollView>
</android.support.v7.widget.CardView>

The screenshot of the dialog to enter description has been provided below.

Step 3

Now after retrieving the description added by the user, the description is saved in the realm database using the realm model object ImageDescModel which will contain the path of the image and the description added as its attributes. The path of the image has been used as the primary key for the description table. The realm model class used for the above-mentioned operation is described below.

public class ImageDescModel extends RealmObject {
  @PrimaryKey
  private String path;
  private String desc;

  public ImageDescModel() {
  }

  public ImageDescModel(String path, String title) {
      this.path = path;
      this.desc = title;
  }

  public String getId() {
      return path;
  }

  public void setId(String path) {
      this.path = path;
  }

  public String getTitle() {
      return desc;
  }

  public void setTitle(String description) {
      this.desc = description;
  }
}

This is how we have implemented the functionality to add description to images in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android Github repository listed in the resource section below.

Resources

1.Realm for Android – https://realm.io/blog/realm-for-android/

2.Github-Phimpme Android Repository – https://github.com/fossasia/phimpme-android/

3.Working with realm tutorial – https://www.androidhive.info/2016/05/android-working-with-realm-database-replacing-sqlite-core-data/

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Displaying Image location Address In Phimpme Android Application

In Phimpme Android application one of the features available is to view the details of any image. The details consists of attributes including Date and time at which the image was captured, size of the image, title, path, EXIF data, description added to the image, location etc. However in the location attribute the location coordinates of the image as well as the location address can be displayed depending on the user’s preference. The process of obtaining the coordinates from address is called as Geocoding and obtaining string address from coordinates is called reverse Geocoding. So in this post I will be explaining how to implement set of strings denoting the address from the available coordinates.

Step 1

First we need to create an instance of the class Geocoder passing context and function Locale.getDefault() as the parameters.  The function of the attribute Locale.getdefault is provided below.

Locale.getDefault() – It returns the current value of the default locale for the current instance of the Java Virtual Machine. The Java Virtual Machine sets the default locale during startup based on the host environment.The code snippet to perform the above mentioned operation is given below.

Geocoder geocoder = new Geocoder(context, Locale.getDefault());

Step 2

Now a function call of getFromLocation() of the Geocoder class is done where we need to pass the Lattitude and Longitude values of the Location object as parameters. The lattitude and longitudes values can be obtained by the use of the Location object functions getLatitude() and getLongitude() respectively. The function getFromLocation() will return a list of Address objects which will contain the extracted addresses from the passed latitude and longitude values. We also need to pass a third parameter an integer value which will determine the maximum no of addresses to be returned. Here we have requested for a maximum of one address. The following code snippet is used to perform the desired function call.

try {
 List<Address> addressList = geocoder.getFromLocation(location.getLatitude(), location.getLongitude(), 1);
} catch (IOException e) {
  e.printStackTrace();
}

Step 3

After obtaining the list of Address objects returned from the function call of getFromLocation() we will extract the first address from the list since we want a maximum of 1 address. The Address object will contain information like the address name, country, state, postal code etc. Now the set of strings describing the location can be retrieved with the help of the function getMaxAddressLineIndex() of Address class. The code snippets to perform the above mentioned operations is provided below.

ArrayList<String> addresslines = new ArrayList<String>();
Address address = addressList.get(0);
for(int i = 0; i <= address.getMaxAddressLineIndex(); i++) {
  addresslines.add(address.getAddressLine(i));
}
details.put(context.getString(R.string.location), TextUtils.join(System.getProperty(“line.separator”),
      addresslines));

The screenshot displaying the location address is provided below.

This is how we have achieved the functionality of displaying location address in a set of strings from available coordinates in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android GitHub repository listed in the resources section below.

Resources

1.Android Developer Guide – https://developer.android.com/training/location/display-address.html

2.Github-Phimpme Android Repository – https://github.com/fossasia/phimpme-android/

3.Address Class Guide- https://developer.android.com/reference/android/location/Address.html

 

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Option to Print Photos in the Phimpme Android Application

In the Phimpme Android application, users can perform various operations on the photos available such as copy, move, add the image to favourites collection, share the images with others, use it as covers, wallpapers and much more. However one another important functionality that has been added in the Phimpe Android application is printing of images. In this post we will be discussing about the implementation of the above mentioned functionality.

Step 1

First we need to create an instance of the class PrintHelper passing context as the constructor parameter which can be done with the following line of code.

PrintHelper photoPrinter = new PrintHelper(this);

Step 2

Now a  function call of setScalemode() is done where we require passing a parameter out of the two options SCALE_MODE_FIT and SCALE_MODE_FILL. The difference between the two options is explained below.

SCALE_MODE_FIT – This option sizes the image so that the whole image is displayed within the printable area of the page.

SCALE_MODE_FILLThis option scales the image so that it fills the entire printable area of the page. Choosing this setting means that some portion of the top and bottom, or left and right edges of the image is left out. This option is the default value if no scale mode is set.

Though neither of the scaling options alter the existing aspect ratio of the image, we are going with the latter of the two as the requirement here is to display the whole image in the printable area. The following code snippet is used to perform the desired function call.

photoPrinter.setScaleMode(PrintHelper.SCALE_MODE_FIT);

Step 3

After obtaining an instance of the class PrintHelper and calling the function setScalemode with the proper scale parameter, the path of the image to be printed is extracted and is passed in as a parameter to the decodefile function of the class BitmapFactory which has another parameter.

A Bitmap object is the return result of the operation performed by the function decodefile. The Bitmap object is thereafter passed in as a parameter to the printBitmap() function of the PrintHelper class along with a string attribute which will denote the file name of the printed photo. The code snippet to the above mentioned operations are given below.

Bitmap bitmap = BitmapFactory.decodeFile(getAlbum().getCurrentMedia().getPath(), new BitmapFactory.Options());
photoPrinter.printBitmap(getString(R.string.print), bitmap);

After the printbitmap() is called no further action is required from the side of the application. The Android system print interface appears where the users can select the printing options. The user can proceed to print the image or cancel the operation. If the user decides to proceed with the operation a print job is created and printing operation notification appears in the system navigation bar. The system print interface appearing is displayed below.

This is how we have achieved the functionality of printing images in the Phimpme Android application. To get the full source code, please refer to the Phimpme Android GitHub repository listed in the resources section below.

Resources

1.Android Developer Guide – https://developer.android.com/training/printing/index.html

2.Github-Phimpme Android Repository – https://github.com/fossasia/phimpme-android/

3.PrintHelper Class Guide – https://developer.android.com/reference/android/support/v4/print/PrintHelper.html

 

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