1.修改RA Image Android照片列表，将缩略图处理放到串行队列。

RA Image/app/src/main/java/com/usai/redant/raimage/PhotoList/PhotoGridActivity.java

@@ -30,6 +30,9 @@ import java.io.Serializable;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.Iterator;
+import java.util.concurrent.Executor;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
 
 public class PhotoGridActivity extends AppCompatActivity implements RAGridView.GridViewMeasure {
 
@@ -178,6 +181,9 @@ public class PhotoGridActivity extends AppCompatActivity implements RAGridView.G
         this.measuring = m;
     }
 
+
+    private ExecutorService executorService = Executors.newSingleThreadExecutor();
+
     /**Adapter*/
     private class GridViewAdapter extends BaseAdapter {
 
@@ -229,7 +235,7 @@ public class PhotoGridActivity extends AppCompatActivity implements RAGridView.G
 
 
             final HashMap<String,String> item = photoDic.get(position);
-            String path = item.get("path");
+            final String path = item.get("path");
 
 
 //            Bitmap bitmap = scaleImage(path);
@@ -243,29 +249,57 @@ public class PhotoGridActivity extends AppCompatActivity implements RAGridView.G
 //            holder.photoView.setImageBitmap(scale);
 
             if (thumbPhotoIsExists(path)) {
-                Bitmap bitmap = BitmapFactory.decodeFile(path);
+                Bitmap bitmap = BitmapFactory.decodeFile(thumbFile(path).getAbsolutePath());
                 holder.photoView.setImageBitmap(bitmap);
             } else {
                 final String filePath = path;
                 final PhotoViewHolder photoHolder = holder;
-                new Thread(new Runnable() {
+//                new Thread(new Runnable() {
+//                    @Override
+//                    public void run() {
+//                        Bitmap bitmap = BitmapFactory.decodeFile(filePath);
+//
+//                        final Bitmap scale = ThumbnailUtils.extractThumbnail(bitmap, 300, 300);
+//
+//                        File thumbFile = thumbFile(filePath);
+//                        savePhotoToFile(scale,thumbFile);
+//
+//                        runOnUiThread(new Runnable() {
+//                            @Override
+//                            public void run() {
+//                                photoHolder.photoView.setImageBitmap(scale);
+//                            }
+//                        });
+//                    }
+//                }).start();
+
+                executorService.submit(new Runnable() {
                     @Override
                     public void run() {
-                        Bitmap bitmap = BitmapFactory.decodeFile(filePath);
-
-                        final Bitmap scale = ThumbnailUtils.extractThumbnail(bitmap, 300, 300);
-
-                        File thumbFile = thumbFile(filePath);
-                        savePhotoToFile(scale,thumbFile);
-
+                        Log.d("Run", "begin " + filePath);
+
+                        Bitmap scale = null;
+                        if (thumbPhotoIsExists(filePath)) {
+                            scale = BitmapFactory.decodeFile(thumbFile(filePath).getAbsolutePath());
+                        } else {
+                            Bitmap bitmap = BitmapFactory.decodeFile(filePath);
+                            scale = ThumbnailUtils.extractThumbnail(bitmap, 300, 300);
+                            File thumbFile = thumbFile(filePath);
+                            savePhotoToFile(scale,thumbFile);
+                            bitmap.recycle();
+                        }
+
+                        final Bitmap scale_img = scale;
                         runOnUiThread(new Runnable() {
                             @Override
                             public void run() {
-                                photoHolder.photoView.setImageBitmap(scale);
+                                photoHolder.photoView.setImageBitmap(scale_img);
+
                             }
                         });
+                        Log.d("Run", "finish " + filePath);
                     }
-                }).start();
+                });
             }