Support "assets-library:://" from CameraRoll.

android/src/main/java/com/remobile/qrcodeLocalImage/RCTQRCodeLocalImage.java

@@ -1,7 +1,9 @@
 package com.remobile.qrcodeLocalImage;
 
+import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.BitmapFactory;
+import android.net.Uri;
 
 import com.facebook.react.bridge.ReactApplicationContext;
 import com.facebook.react.bridge.ReactContextBaseJavaModule;
@@ -22,8 +24,12 @@
 
 
 public class RCTQRCodeLocalImage extends ReactContextBaseJavaModule {
+
+    private Context context;
+
     public RCTQRCodeLocalImage(ReactApplicationContext reactContext) {
         super(reactContext);
+        this.context = reactContext;
     }
 
     @Override
@@ -36,17 +42,27 @@ public void decode(String path, Callback callback) {
         Hashtable<DecodeHintType, String> hints = new Hashtable<DecodeHintType, String>();
         hints.put(DecodeHintType.CHARACTER_SET, "utf-8"); // 设置二维码内容的编码
         BitmapFactory.Options options = new BitmapFactory.Options();
-        options.inJustDecodeBounds = true; // 先获取原大小
-        options.inJustDecodeBounds = false; // 获取新的大小
+        // 返回宽度高度为原图的1/4，节省内存，解决 OOM 异常
+        options.inSampleSize = 4;
+        // 附加上图片的Config参数，解析器或根据当前的参数配置进行对应的解析，这也可以有效减少加载的内存。
+        options.inPreferredConfig = Bitmap.Config.RGB_565;
+        // 由此产生的位图将分配它的像素,这样他们可以被净化系统需要回收的内存。
+        options.inPurgeable = true;
 
-        int sampleSize = (int) (options.outHeight / (float) 200);
-
-        if (sampleSize <= 0)
-            sampleSize = 1;
-        options.inSampleSize = sampleSize;
         Bitmap scanBitmap = null;
         if (path.startsWith("http://")||path.startsWith("https://")) {
             scanBitmap = this.getbitmap(path);
+        } else if (path.startsWith("content://")) {
+            try {
+                InputStream inputStream = this.context.getContentResolver().openInputStream(Uri.parse(path));
+                if (inputStream != null) {
+                    scanBitmap = BitmapFactory.decodeStream(inputStream, null, options);
+                    inputStream.close();
+                }
+            } catch (IOException e) {
+                e.printStackTrace();
+                scanBitmap = null;
+            }
         } else {
             scanBitmap = BitmapFactory.decodeFile(path, options);
         }

ios/RCTQRCodeLocalImage/RCTQRCodeLocalImage.m

@@ -9,45 +9,68 @@
 #import <UIKit/UIKit.h>
 #import <React/RCTLog.h>
 #import <React/RCTUtils.h>
+#import <Photos/Photos.h>
 #import "RCTQRCodeLocalImage.h"
 
 @implementation RCTQRCodeLocalImage
 RCT_EXPORT_MODULE()
 
-RCT_EXPORT_METHOD(decode:(NSString *)path callback:(RCTResponseSenderBlock)callback)
-{
-    UIImage *srcImage;
+- (void)loadImageWithPath:(NSString *)path callback:(void(^)(UIImage * _Nullable srcImage))callback {
     if ([path hasPrefix:@"http://"] || [path hasPrefix:@"https://"]) {
-        srcImage = [UIImage imageWithData: [NSData dataWithContentsOfURL:[NSURL URLWithString: path]]];
-    } else {
-        srcImage = [[UIImage alloc] initWithContentsOfFile:path];
-    }
-    if (nil==srcImage){
-        NSLog(@"PROBLEM! IMAGE NOT LOADED\n");
-        callback(@[RCTMakeError(@"IMAGE NOT LOADED!", nil, nil)]);
-        return;
-    }
-    NSLog(@"OK - IMAGE LOADED\n");
-    NSDictionary *detectorOptions = @{@"CIDetectorAccuracy": @"CIDetectorAccuracyHigh"};
-    CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:detectorOptions];
-    CIImage *image = [CIImage imageWithCGImage:srcImage.CGImage];
-    NSArray *features = [detector featuresInImage:image];
-    if (0==features.count) {
-        NSLog(@"PROBLEM! Feature size is zero!\n");
-        callback(@[RCTMakeError(@"Feature size is zero!", nil, nil)]);
-        return;
-    }
-
-    CIQRCodeFeature *feature = [features firstObject];
-
-    NSString *result = feature.messageString;
-    NSLog(@"result: %@", result);
-
-    if (result) {
-        callback(@[[NSNull null], result]);
+        callback([UIImage imageWithData: [NSData dataWithContentsOfURL:[NSURL URLWithString: path]]]);
+    } else if ([path hasPrefix:@"assets-library://"]) {
+        PHFetchResult *results = [PHAsset fetchAssetsWithALAssetURLs:@[[NSURL URLWithString:path]] options:nil];
+        PHAsset *asset = [results firstObject];
+        PHImageRequestOptions *imageOptions = [PHImageRequestOptions new];
+        imageOptions.networkAccessAllowed = YES;
+        imageOptions.deliveryMode = PHImageRequestOptionsDeliveryModeHighQualityFormat;
+        imageOptions.resizeMode = PHImageRequestOptionsResizeModeNone;
+
+        [[PHImageManager defaultManager] requestImageDataForAsset:asset
+                                                          options:imageOptions
+                                                    resultHandler:^(NSData * _Nullable imageData, NSString * _Nullable dataUTI, UIImageOrientation orientation, NSDictionary * _Nullable info) {
+                                                        if (imageData == nil) {
+                                                            callback(nil);
+                                                        } else {
+                                                            callback([UIImage imageWithData:imageData]);
+                                                        }
+                                                    }];
     } else {
-        callback(@[RCTMakeError(@"QR Parse failed!", nil, nil)]);
-        return;
+        callback([[UIImage alloc] initWithContentsOfFile:path]);
     }
 }
+
+RCT_EXPORT_METHOD(decode:(NSString *)path callback:(RCTResponseSenderBlock)callback)
+{
+    [self loadImageWithPath:path callback:^(UIImage * _Nullable srcImage) {
+        if (nil==srcImage){
+            NSLog(@"PROBLEM! IMAGE NOT LOADED\n");
+            callback(@[RCTMakeError(@"IMAGE NOT LOADED!", nil, nil)]);
+            return;
+        }
+        NSLog(@"OK - IMAGE LOADED\n");
+
+        NSDictionary *detectorOptions = @{@"CIDetectorAccuracy": @"CIDetectorAccuracyHigh"};
+        CIDetector *detector = [CIDetector detectorOfType:CIDetectorTypeQRCode context:nil options:detectorOptions];
+        CIImage *image = [CIImage imageWithCGImage:srcImage.CGImage];
+        NSArray *features = [detector featuresInImage:image];
+        if (0==features.count) {
+            NSLog(@"PROBLEM! Feature size is zero!\n");
+            callback(@[RCTMakeError(@"Feature size is zero!", nil, nil)]);
+            return;
+        }
+
+        CIQRCodeFeature *feature = [features firstObject];
+
+        NSString *result = feature.messageString;
+        NSLog(@"result: %@", result);
+
+        if (result) {
+            callback(@[[NSNull null], result]);
+        } else {
+            callback(@[RCTMakeError(@"QR Parse failed!", nil, nil)]);
+            return;
+        }
+    }];
+}
 @end