Get last image captured using camera on Android

问题:

I am trying to get the last image captured by the user using a camera app using the following code and display it to the user in my camera app's (like other camera apps do, show a small preview of the last image capture in a corner):

String[] projection = new String[]{                     MediaStore.Images.ImageColumns._ID,                     MediaStore.Images.ImageColumns.DATA,                     MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,                     MediaStore.Images.ImageColumns.DATE_TAKEN,                     MediaStore.Images.ImageColumns.MIME_TYPE             };             final Cursor cursor = getContentResolver()                     .query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, projection, null,                             null, MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC");              if (cursor.moveToFirst()) {                 Bitmap bm = BitmapFactory.decodeFile(cursor.getString(1));                 imagePreview.setImageBitmap(bm);             } 

but the code shows me the last image in my phone from anywhere, like if i take a screenshot then it shows me that. I want to display the last image captured from the DCIM folder or whichever folder the photos are kept, not photos I download or screenshot. Can anyone help me out?

回答1:

It pretty sure returns all android standard phone's Camera folder, otherwise ask the user to set the Camera folder. also you can provide more conditions to check...

String[] projection = new String[]{         MediaStore.Images.ImageColumns._ID,         MediaStore.Images.ImageColumns.DATA,         MediaStore.Images.ImageColumns.BUCKET_DISPLAY_NAME,         MediaStore.Images.ImageColumns.DATE_TAKEN,         MediaStore.Images.ImageColumns.MIME_TYPE};  Cursor cursor = getActivity().getContentResolver().query(         MediaStore.Images.Media.EXTERNAL_CONTENT_URI,         projection,         null,         null,         MediaStore.Images.ImageColumns.DATE_TAKEN + " DESC"); if(cursor != null){     cursor.moveToFirst();     while(cursor.moveToNext()){         String path = cursor.getString(cursor.getColumnIndex(MediaStore.Images.Media.DATA));          if(path.toUpperCase().contains("DCIM/CAMERA") ||              path.toUpperCase().contains("DCIM/100ANDRO")||              path.toUpperCase().contains("DCIM/100MEDIA")){          Log.d(TAG,path);         File file = new File(path);         path = file.getParent();         return path;         }         continue;     }     //cursor.close();     return null; 

回答2:

there's no official observer for that. You may want to use a FileWatcher or an observer when a media image has been taken. You will need a receiver which listen for the camerashot and then query the mediastore for the last updated image.

// in the receivers class in onChange()  Cursor cursor = context.getContentResolver().query(uri, null, null, null, "date_added DESC LIMIT 1"); Media media = null; if (cursor.moveToNext()) {      int dataColumn = cursor.getColumnIndexOrThrow(MediaColumns.DATA);      String filePath = cursor.getString(dataColumn);  } 

In the cyanogenmod there's an Intent Filter flag (which is working until now)

 <receiver         android:name="com.app.CameraEventReceiver"         android:enabled="true">         <intent-filter>             <action android:name="com.android.camera.NEW_PICTURE"/>             <data android:mimeType="image/*"/>         </intent-filter>     </receiver>  

文章来源: Get last image captured using camera on Android