如何在畫廊中獲得新媒體的Uri？

Question

我試圖在添加圖庫時獲取圖庫中所有媒體的Uri。例如。用途拍攝照片。我自動收到一個包含Uri的意圖。我針對Apis 21-26，Android刪除了在Api 25中執行此操作的功能，而無需使用JobObservers。我不知道如何用JobObserver來做到這一點。有人可以幫忙嗎？

Answer 1

首先，FileOberver是一種內存殺手方法。考慮大量的文件。而ContentObserver似乎是一種更好的方法。

getContentResolver().registerContentObserver(android.provider.MediaStore.Images.Media.INTERNAL_CONTENT_URI, true, 
     new ContentObserver(new Handler()) { 
      @Override 
      public void onChange(boolean selfChange) { 
       Log.d("your_tag","Internal Media has been changed"); 
       super.onChange(selfChange); 
       Long timestamp = readLastDateFromMediaStore(context, MediaStore.Images.Media.INTERNAL_CONTENT_URI); 
       // comapare with your stored last value and do what you need to do 

      } 
     } 
    ); 
getContentResolver().registerContentObserver(android.provider.MediaStore.Images.Media.EXTERNAL_CONTENT_URI, true, 
    new ContentObserver(new Handler()) { 
     @Override 
     public void onChange(boolean selfChange) { 
      Log.d("your_tag","External Media has been changed"); 
      super.onChange(selfChange); 

      Long timestamp = readLastDateFromMediaStore(context, MediaStore.Images.Media.EXTERNAL_CONTENT_URI); 
      // comapare with your stored last value and do what you need to do 
     } 
     } 

); 

private Long readLastDateFromMediaStore(Context context, Uri uri) { 
     Cursor cursor = context.getContentResolver().query(uri, null, null, null, "date_added DESC"); 
     PhotoHolder media = null; 
     Long dateAdded =-1; 
     if (cursor.moveToNext()) { 
      Long dateAdded = cursor.getLong(cursor.getColumnIndexOrThrow(MediaColumns.DATE_ADDED));   
     } 
     cursor.close(); 
     return dateAdded; 
} 

Answer 2

要使用的jobscheduler使用您使用這些內容的URI

JobInfo.Builder builder = new JobInfo.Builder(ASJOBSERVICE_JOB_ID, new ComponentName("co.intellidev.storj", JobSchedulerService.class.getName())); 
      builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, flag)); 
      builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Images.Media.INTERNAL_CONTENT_URI, flag)); 
      builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, flag)); 
      builder.addTriggerContentUri(new JobInfo.TriggerContentUri(MediaStore.Video.Media.INTERNAL_CONTENT_URI, flag));