implement deleting files from viewpager

app/src/main/java/com/simplemobiletools/gallery/activities/ViewPagerActivity.java

@@ -2,6 +2,7 @@ package com.simplemobiletools.gallery.activities;
 
 import android.content.Intent;
 import android.database.Cursor;
+import android.media.MediaScannerConnection;
 import android.net.Uri;
 import android.os.Bundle;
 import android.provider.MediaStore;
@@ -29,6 +30,7 @@ public class ViewPagerActivity extends AppCompatActivity implements ViewPager.On
     private ActionBar actionbar;
     private List<String> photos;
     private MyViewPager pager;
+    private String path;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -40,10 +42,10 @@ public class ViewPagerActivity extends AppCompatActivity implements ViewPager.On
         actionbar = getSupportActionBar();
         hideSystemUI();
 
-        final String path = getIntent().getStringExtra(Constants.PHOTO);
+        path = getIntent().getStringExtra(Constants.PHOTO);
         final MyPagerAdapter adapter = new MyPagerAdapter(getSupportFragmentManager());
         pager = (MyViewPager) findViewById(R.id.view_pager);
-        photos = getPhotos(path);
+        photos = getPhotos();
         adapter.setPaths(photos);
         pager.setAdapter(adapter);
         pager.setCurrentItem(pos);
@@ -63,7 +65,7 @@ public class ViewPagerActivity extends AppCompatActivity implements ViewPager.On
 
     @Override
     public boolean onCreateOptionsMenu(Menu menu) {
-        getMenuInflater().inflate(R.menu.menu, menu);
+        getMenuInflater().inflate(R.menu.viewpager_menu, menu);
         return true;
     }
 
@@ -73,6 +75,9 @@ public class ViewPagerActivity extends AppCompatActivity implements ViewPager.On
             case R.id.menu_share:
                 shareImage();
                 return true;
+            case R.id.menu_remove:
+                deleteImage();
+                return true;
             default:
                 return super.onOptionsItemSelected(item);
         }
@@ -89,7 +94,43 @@ public class ViewPagerActivity extends AppCompatActivity implements ViewPager.On
         startActivity(Intent.createChooser(sendIntent, shareTitle));
     }
 
-    private List<String> getPhotos(final String path) {
+    private void deleteImage() {
+        final String path = photos.get(pager.getCurrentItem());
+        final File file = new File(path);
+        file.delete();
+
+        MediaScannerConnection.scanFile(this, new String[]{path}, null, new MediaScannerConnection.OnScanCompletedListener() {
+            @Override
+            public void onScanCompleted(final String path, final Uri uri) {
+                runOnUiThread(new Runnable() {
+                    @Override
+                    public void run() {
+                        reloadViewPager();
+                    }
+                });
+            }
+        });
+    }
+
+    private void reloadViewPager() {
+        final MyPagerAdapter adapter = (MyPagerAdapter) pager.getAdapter();
+        final int pos = pager.getCurrentItem();
+        photos = getPhotos();
+        if (photos.size() <= 0) {
+            finish();
+            return;
+        }
+
+        pager.setAdapter(null);
+        adapter.updateItems(photos);
+        pager.setAdapter(adapter);
+
+        final int newPos = Math.min(pos, adapter.getCount());
+        pager.setCurrentItem(newPos);
+        updateActionbarTitle();
+    }
+
+    private List<String> getPhotos() {
         final List<String> photos = new ArrayList<>();
         final String fileDir = new File(path).getParent();
         final Uri uri = MediaStore.Images.Media.EXTERNAL_CONTENT_URI;

app/src/main/java/com/simplemobiletools/gallery/adapters/MyPagerAdapter.java

@@ -4,10 +4,10 @@ import android.support.v4.app.Fragment;
 import android.support.v4.app.FragmentManager;
 import android.support.v4.app.FragmentStatePagerAdapter;
 
-import java.util.List;
-
 import com.simplemobiletools.gallery.ViewPagerFragment;
 
+import java.util.List;
+
 public class MyPagerAdapter extends FragmentStatePagerAdapter {
     private List<String> paths;
 
@@ -30,4 +30,10 @@ public class MyPagerAdapter extends FragmentStatePagerAdapter {
         fragment.setPath(paths.get(position));
         return fragment;
     }
+
+    public void updateItems(List<String> newPaths) {
+        paths.clear();
+        paths.addAll(newPaths);
+        notifyDataSetChanged();
+    }
 }

app/src/main/res/menu/viewpager_menu.xml

@@ -1,10 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
       xmlns:app="http://schemas.android.com/apk/res-auto">
+    <item
+        android:id="@+id/menu_remove"
+        android:icon="@android:drawable/ic_menu_delete"
+        android:title="@string/remove"
+        app:showAsAction="ifRoom"/>
     <item
         android:id="@+id/menu_share"
         android:icon="@android:drawable/ic_menu_share"
         android:title="Share"
         app:showAsAction="always"/>
-
 </menu>