Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import java.io.IOException;
import android.content.ContentProviderClient;
import android.content.ContentResolver;
import android.content.Context;
import android.database.Cursor;
import android.media.ExifInterface;
import android.net.Uri;

import android.provider.MediaStore.Images;

public class Main {
    /**
     * Return the rotation of the passed image file
     * 
     * @param filepath
     *           image absolute file path
     * @return image orientation
     */
    public static int getExifOrientation(final String filepath) {
        if (null == filepath)
            return 0;
        ExifInterface exif = null;
        try {
            exif = new ExifInterface(filepath);
        } catch (IOException e) {
            return 0;
        }
        return getExifOrientation(exif);
    }

    public static int getExifOrientation(final ExifInterface exif) {
        int degree = 0;

        if (exif != null) {
            final int orientation = exif.getAttributeInt(ExifInterface.TAG_ORIENTATION, -1);
            if (orientation != -1) {
                switch (orientation) {
                case ExifInterface.ORIENTATION_ROTATE_90:
                    degree = 90;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_180:
                    degree = 180;
                    break;
                case ExifInterface.ORIENTATION_ROTATE_270:
                    degree = 270;
                    break;
                }
            }
        }
        return degree;
    }

    /**
     * Return the string representation of the given orientation
     * 
     * @param orientation
     * @return
     */
    public static String getExifOrientation(int orientation) {
        switch (orientation) {
        case 0:
            return String.valueOf(ExifInterface.ORIENTATION_NORMAL);
        case 90:
            return String.valueOf(ExifInterface.ORIENTATION_ROTATE_90);
        case 180:
            return String.valueOf(ExifInterface.ORIENTATION_ROTATE_180);
        case 270:
            return String.valueOf(ExifInterface.ORIENTATION_ROTATE_270);
        default:
            throw new AssertionError("invalid: " + orientation);
        }
    }

    /**
     * Try to get the exif orientation of the passed image uri
     * 
     * @param context
     * @param uri
     * @return
     */
    public static int getExifOrientation(Context context, Uri uri) {

        final String scheme = uri.getScheme();

        ContentProviderClient provider = null;
        if (scheme == null || ContentResolver.SCHEME_FILE.equals(scheme)) {
            return getExifOrientation(uri.getPath());
        } else if (scheme.equals(ContentResolver.SCHEME_CONTENT)) {
            try {
                provider = context.getContentResolver().acquireContentProviderClient(uri);
            } catch (SecurityException e) {
                return 0;
            }

            if (provider != null) {
                Cursor result;
                try {
                    result = provider.query(uri,
                            new String[] { Images.ImageColumns.ORIENTATION, Images.ImageColumns.DATA }, null, null,
                            null);
                } catch (Exception e) {
                    e.printStackTrace();
                    return 0;
                }

                if (result == null) {
                    return 0;
                }

                int orientationColumnIndex = result.getColumnIndex(Images.ImageColumns.ORIENTATION);
                int dataColumnIndex = result.getColumnIndex(Images.ImageColumns.DATA);

                try {
                    if (result.getCount() > 0) {
                        result.moveToFirst();

                        int rotation = 0;

                        if (orientationColumnIndex > -1) {
                            rotation = result.getInt(orientationColumnIndex);
                        }

                        if (dataColumnIndex > -1) {
                            String path = result.getString(dataColumnIndex);
                            rotation |= getExifOrientation(path);
                        }
                        return rotation;
                    }
                } finally {
                    result.close();
                }
            }
        }
        return 0;
    }
}