File Photo Viewer

A simple library for viewing an image file on Android from local storage.

[] (https://jitpack.io/#skywidesoft/FilePhotoView)

Libraries used

• Glide: for image photo loading
• PhotoView: for image viewing with zoom functions

Gradle dependency

Add it to your build.gradle with:

allprojects {
    repositories {
        maven { url "https://jitpack.io" }
    }
}

and:

dependencies {
    compile 'com.github.skywidesoft:FilePhotoView:{latest version}'
}

Usage

Use this library is very simple, you just need to invoke the class "com.skywidesoft.filephotoview.FilePhotoViewActivity" and pass in the absolute path of the file to view.

Sample

The following is a sample Activity class that do the following:

• Download a file from Internet and turn into a Bitmap image
• Generate a uuid for the file name
• Save the file to application cache
• Create a new Intent for the FilePhotoViewActivity, and pass the file name (with the argument name "imageFilePath")

Sample code snippet (from sample folder)

public class MainActivity extends AppCompatActivity {

    Button viewBtn;
    EditText imageUrl;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageUrl = (EditText) findViewById(R.id.imageUrl);

        viewBtn = (Button) findViewById(R.id.viewBtn);

        viewBtn.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {

                // Download image from Internet and save to application cache
                Glide.with(MainActivity.this)
                        .load(imageUrl.getText().toString())
                        .asBitmap()
                        .into(new SimpleTarget<Bitmap>() {
                            @Override
                            public void onResourceReady(Bitmap resource, GlideAnimation<? super Bitmap> glideAnimation) {
                                Log.d("MainActivity", "Image downloaded successfully");

                                // Save file to application cache
                                String imageFileName = UUID.randomUUID().toString() + ".jpg";
                                String imageFilePath = saveBitmapToCache(resource, imageFileName, MainActivity.this);

                                // Start photo view activity
                                Intent i = new Intent(MainActivity.this, FilePhotoViewActivity.class);
                                i.putExtra("imageFilePath", imageFilePath);

                                startActivity(i);
                            }
                        });


            }

        });
    }

    private String saveBitmapToCache(Bitmap resource, String fileName, Context context) {

        Log.d("MainActivity", "Saving image file to application cache");

        Log.d("MainActivity", "Cache directory: " + context.getCacheDir().getAbsolutePath());

        File imageFile = new File(context.getCacheDir().getAbsolutePath() + "/" + fileName);

        Log.d("MainActivity", "Saving file: " + imageFile.getAbsolutePath());

        String fileExt = fileName.substring(fileName.lastIndexOf(".")).toLowerCase();

        Bitmap.CompressFormat format;

        if (fileExt.equals("png")) {

            format = Bitmap.CompressFormat.PNG;

        } else {

            format = Bitmap.CompressFormat.JPEG;

        }

        OutputStream outputStream;

        try {

            outputStream = new FileOutputStream(imageFile);

            resource.compress(format, 100, outputStream);

            Log.d("MainActivity", "Image file saved successfully");

        } catch (Exception ex) {

            Log.e("MainActivity", "Error saving image file: " + ex.getMessage());

        }

        return imageFile.getAbsolutePath();

    }
}