You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
50 lines
1.8 KiB
50 lines
1.8 KiB
6 years ago
|
---
|
||
|
|
layout: page
|
||
|
|
title: "Error Handling"
|
||
|
|
category: docs
|
||
|
|
order: 9
|
||
|
|
date: 2018-12-20 20:02:31
|
||
|
|
---
|
||
|
|
|
||
|
|
Errors are posted to the registered `CameraListener`s callback:
|
||
|
|
|
||
|
|
```java
|
||
|
|
@Override
|
||
|
|
public void onCameraError(CameraException error) {
|
||
|
|
// Got error!
|
||
|
|
};
|
||
|
|
```
|
||
|
|
|
||
|
|
You are supposed to inspect the `CameraException` object as it contains useful information about
|
||
|
|
what happened and what should be done, if anything. All things that fail can end up throwing this
|
||
|
|
exception, which includes temporary actions like taking a picture, or functional actions like
|
||
|
|
starting the camera preview.
|
||
|
|
|
||
|
|
### Unrecoverable errors
|
||
|
|
|
||
|
|
You can exclude unrecoverable errors using `CameraException.isUnrecoverable()`.
|
||
|
|
If this function returns true, at this point the camera has been released and it is likely showing
|
||
|
|
a black preview. The operation can't go on.
|
||
|
|
|
||
|
|
You can try to call `camera.start()` again, but that's not guaranteed to work. For example, the
|
||
|
|
camera sensor might be in use by another application, so there's nothing we could do.
|
||
|
|
|
||
|
|
### Other errors
|
||
|
|
|
||
|
|
For more fine grained control over what happened, inspect the reason using `CameraException.getReason()`.
|
||
|
|
This will return one of the `CameraException.REASON_` constants:
|
||
|
|
|
||
|
|
|Constant|Description|Unrecoverable|
|
||
|
|
|--------|-----------|-------------|
|
||
|
|
|`REASON_UNKNOWN`|Unknown error. No other info available.|No|
|
||
|
|
|`REASON_FAILED_TO_CONNECT`|Failed to connect to the camera service.|Yes|
|
||
|
|
|`REASON_FAILED_TO_START_PREVIEW`|Failed to start the camera preview.|Yes|
|
||
|
|
|`REASON_DISCONNECTED`|Camera was forced to disconnect by the system.|Yes|
|
||
|
|
|`REASON_PICTURE_FAILED`|Could not take a picture or picture snapshot.|No|
|
||
|
|
|`REASON_VIDEO_FAILED`|Could not take a video or video snapshot.|No|
|
||
|
|
|`REASON_NO_CAMERA`|Could not find a camera for this `Facing` value. You can try another.|No|
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
|