安卓图片选择支持heic/heif格式，PhotoPicker改造

  随着安卓手机heic格式图片格式照片的普及，照片能够在相同画质的情况下减少几乎一半的体积，但是在安卓开发中，按照我们传统的读取图片方式，是没有办法读取heic格式图片。经过这几天的摸索，现将解决方法分享出来：

  我们的项目是在PhotoPick这一款开源框架的基础上二次开发的，首先特别感谢PhotoPicker开发的作者：PhotoPicker传送门

  在阅读源码之后，了解到，项目使用的是LoaderManager读取系统的资源文件，源码贴到下面：

package me.iwf.photopicker.utils;

import android.content.Context;
import android.database.Cursor;
import android.os.Bundle;
import androidx.fragment.app.FragmentActivity;
import androidx.loader.app.LoaderManager;
import androidx.loader.content.Loader;

import java.util.ArrayList;
import java.util.List;
import me.iwf.photopicker.PhotoPicker;
import me.iwf.photopicker.R;
import me.iwf.photopicker.entity.PhotoDirectory;

import static android.provider.BaseColumns._ID;
import static android.provider.MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME;
import static android.provider.MediaStore.Images.ImageColumns.BUCKET_ID;
import static android.provider.MediaStore.MediaColumns.DATA;
import static android.provider.MediaStore.MediaColumns.DATE_ADDED;
import static android.provider.MediaStore.MediaColumns.SIZE;

/**
 * Created by donglua on 15/5/31.
 */
public class MediaStoreHelper {

  public final static int INDEX_ALL_PHOTOS = 0;


  public static void getPhotoDirs(FragmentActivity activity, Bundle args, PhotosResultCallback resultCallback) {
    activity.getSupportLoaderManager()
        .initLoader(0, args, new PhotoDirLoaderCallbacks(activity, resultCallback));
  }

  private static class PhotoDirLoaderCallbacks implements LoaderManager.LoaderCallbacks<Cursor> {

    private Context context;
    private PhotosResultCallback resultCallback;

    public PhotoDirLoaderCallbacks(Context context, PhotosResultCallback resultCallback) {
      this.context = context;
      this.resultCallback = resultCallback;
    }

    @Override public Loader<Cursor> onCreateLoader(int id, Bundle args) {
      return new PhotoDirectoryLoader(context, args.getBoolean(PhotoPicker.EXTRA_SHOW_GIF, false));
    }

    @Override public void onLoadFinished(Loader<Cursor> loader, Cursor data) {

      if (data == null)  return;
      List<PhotoDirectory> directories = new ArrayList<>();
      PhotoDirectory photoDirectoryAll = new PhotoDirectory();
      photoDirectoryAll.setName(context.getString(R.string.__picker_all_image));
      photoDirectoryAll.setId("ALL");

      data.moveToFirst();

      while (data.moveToNext()) {

        int imageId  = data.getInt(data.getColumnIndexOrThrow(_ID));
        String bucketId = data.getString(data.getColumnIndexOrThrow(BUCKET_ID));
        String name = data.getString(data.getColumnIndexOrThrow(BUCKET_DISPLAY_NAME));
        String path = data.getString(data.getColumnIndexOrThrow(DATA));
        long size = data.getInt(data.getColumnIndexOrThrow(SIZE));

        if (size < 1) continue;

        PhotoDirectory photoDirectory = new PhotoDirectory();
        photoDirectory.setId(bucketId);
        photoDirectory.setName(name);

        if (!directories.contains(photoDirectory)) {
          photoDirectory.setCoverPath(path);
          photoDirectory.addPhoto(imageId, path);
          photoDirectory.setDateAdded(data.getLong(data.getColumnIndexOrThrow(DATE_ADDED)));
          directories.add(photoDirectory);
        } else {
          directories.get(directories.indexOf(photoDirectory)).addPhoto(imageId, path);
        }

        photoDirectoryAll.addPhoto(imageId, path);
      }
      if (photoDirectoryAll.getPhotoPaths().size() > 0) {
        photoDirectoryAll.setCoverPath(photoDirectoryAll.getPhotoPaths().get(0));
      }
      directories.add(INDEX_ALL_PHOTOS, photoDirectoryAll);
      if (resultCallback != null) {
        resultCallback.onResultCallback(directories);
      }
    }

    @Override public void onLoaderReset(Loader<Cursor> loader) {

    }
  }


  public interface PhotosResultCallback {
    void onResultCallback(List<PhotoDirectory> directories);
  }

}

  而读取条件作者是在PhotoDirectoryLoader类中进行处理的：

package me.iwf.photopicker.utils;

import android.content.Context;
import android.net.Uri;
import android.provider.MediaStore.Images.Media;
import androidx.loader.content.CursorLoader;

import static android.provider.MediaStore.MediaColumns.MIME_TYPE;

/**
 * Created by 黄东鲁 on 15/6/28.
 */
public class PhotoDirectoryLoader extends CursorLoader {

  final String[] IMAGE_PROJECTION = {
      Media._ID,
      Media.DATA,
      Media.BUCKET_ID,
      Media.BUCKET_DISPLAY_NAME,
      Media.DATE_ADDED,
      Media.SIZE
  };

  public PhotoDirectoryLoader(Context context, boolean showGif) {
    super(context);

    setProjection(IMAGE_PROJECTION);
    setUri(Media.EXTERNAL_CONTENT_URI);
    setSortOrder(Media.DATE_ADDED + " DESC");

    setSelection(
        MIME_TYPE + "=? or " + MIME_TYPE + "=? or "+ MIME_TYPE + "=? " + (showGif ? ("or " + MIME_TYPE + "=?") : ""));
    String[] selectionArgs;
    if (showGif) {
      selectionArgs = new String[] { "image/jpeg", "image/png", "image/jpg","image/gif" };
    } else {
      selectionArgs = new String[] { "image/jpeg", "image/png", "image/jpg" };
    }
    setSelectionArgs(selectionArgs);
  }


  private PhotoDirectoryLoader(Context context, Uri uri, String[] projection, String selection,
      String[] selectionArgs, String sortOrder) {
    super(context, uri, projection, selection, selectionArgs, sortOrder);
  }


}

  支持heic格式的关键就在selectionArgs中，我们在setSelection方法中添加heic格式的支持即可，修改如下（其他app也可以参照此修改，如果是使用ContentProvider读取系统媒体文件的话，也可以照此修改）：

  public PhotoDirectoryLoader(Context context, boolean showGif) {
    super(context);

    setProjection(IMAGE_PROJECTION);
    setUri(Media.EXTERNAL_CONTENT_URI);
    setSortOrder(Media.DATE_ADDED + " DESC");

    setSelection(
        MIME_TYPE + "=? or " +MIME_TYPE + "=? or " + MIME_TYPE + "=? or "+ MIME_TYPE + "=? " + (showGif ? ("or " + MIME_TYPE + "=?") : ""));
    String[] selectionArgs;
    if (showGif) {
      selectionArgs = new String[] { "image/heic","image/jpeg", "image/png", "image/jpg","image/gif" };
    } else {
      selectionArgs = new String[] { "image/heic","image/jpeg", "image/png", "image/jpg" };
    }
    setSelectionArgs(selectionArgs);
  }

  而在图片的预览界面，由于使用的是Glide框架，这里提供一个可用的版本号：

  implementation "com.github.bumptech.glide:glide:4.10.0"

  最新版4.11.0似乎有问题，这里github上给出了解释：

  大家看到这篇文章的时候，可能4.12.0已经发布了哦，哈哈！