1 @ReactMethod
 2     private void deleteImage(String fileName, String uri, Callback callback) {
 3         try {
 4             File file = new File(fileName);
 5             if (file.exists())
 6                 file.delete();
 7             ContentResolver mContentResolver = this.getContentResolver();
 8             String where = MediaStore.Images.Media.DATA + "='" + fileName + "'";
 9             // 删除操作
10             mContentResolver.delete(Uri.parse(uri), where, null);
11             //刷新操作
12             File delete_file = new File(uri);
13             // 扫描单个媒体文件，注意是文件，不是文件夹
14             new SingleMediaScanner(this, delete_file);
15             callback.invoke("删除成功");
16 //                    else
17 //            callback.invoke('删除失败');
18
19         } catch (Exception e) {
20         }
21
22     }

 1 public class SingleMediaScanner implements MediaScannerConnection.MediaScannerConnectionClient {
 2
 3     private MediaScannerConnection mMs;
 4     private File mFile;
 5
 6     public SingleMediaScanner(Context context, File f) {
 7         mFile = f;
 8         mMs = new MediaScannerConnection(context, this);
 9         mMs.connect();
10     }
11
12     @Override
13     public void onMediaScannerConnected() {
14         mMs.scanFile(mFile.getAbsolutePath(), null);
15     }
16
17     @Override
18     public void onScanCompleted(String path, Uri uri) {
19         mMs.disconnect();
20     }
21
22 }

 1 // NOTE: Currently not reentrant / doesn't support concurrent requests
 2   @ReactMethod
 3   public void launchCamera(final ReadableMap options, final Callback callback)
 4   {
 5     //新加begin
 6     Activity currentActivity = getCurrentActivity();
 7
 8     if (currentActivity == null)
 9     {
10       responseHelper.invokeError(callback, "can't find current Activity");
11       return;
12     }
13     //新加end
14
15     if (!isCameraAvailable())
16     {
17       responseHelper.invokeError(callback, "Camera not available");
18       return;
19     }
20 //    注释掉原有的代码
21 //    final Activity currentActivity = getCurrentActivity();
22 //    if (currentActivity == null)
23 //    {
24 //      responseHelper.invokeError(callback, "can't find current Activity");
25 //      return;
26 //    }
27
28     this.options = options;
29     //新加begin
30     imageConfig = new ImageConfig(null, null, 0, 0, 100, 0, false);
31     //新加end
32     if (!permissionsCheck(currentActivity, callback, REQUEST_PERMISSIONS_FOR_CAMERA))
33     {
34       return;
35     }
36
37     parseOptions(this.options);
38
39     int requestCode;
40     Intent cameraIntent;
41
42     if (pickVideo)
43     {
44       requestCode = REQUEST_LAUNCH_VIDEO_CAPTURE;
45       cameraIntent = new Intent(MediaStore.ACTION_VIDEO_CAPTURE);
46       cameraIntent.putExtra(MediaStore.EXTRA_VIDEO_QUALITY, videoQuality);
47       if (videoDurationLimit > 0)
48       {
49         cameraIntent.putExtra(MediaStore.EXTRA_DURATION_LIMIT, videoDurationLimit);
50       }
51     }
52     else
53     {
54       requestCode = REQUEST_LAUNCH_IMAGE_CAPTURE;
55       cameraIntent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
56
57       final File original = createNewFile(reactContext, this.options, false);
58       imageConfig = imageConfig.withOriginalFile(original);
59
60       cameraCaptureURI = RealPathUtil.compatUriFromFile(reactContext, imageConfig.original);
61       if (cameraCaptureURI == null)
62       {
63         responseHelper.invokeError(callback, "Couldn't get file path for photo");
64         return;
65       }
66       cameraIntent.putExtra(MediaStore.EXTRA_OUTPUT, cameraCaptureURI);
67     }
68
69     if (cameraIntent.resolveActivity(reactContext.getPackageManager()) == null)
70     {
71       responseHelper.invokeError(callback, "Cannot launch camera");
72       return;
73     }
74
75     this.callback = callback;
76
77     try
78     {
79       currentActivity.startActivityForResult(cameraIntent, requestCode);
80     }
81     catch (ActivityNotFoundException e)
82     {
83       e.printStackTrace();
84       responseHelper.invokeError(callback, "Cannot launch camera");
85     }
86   }