我想用PhoneGap创建InAppBrowser的屏幕截图。我搜索了很多,但我一无所获。这甚至可能吗?
我的目标是:iOS和Android
如果你想截取主窗口的截图,cordova screenshot plugin会帮助你。屏幕截图将保存在应用程序存储中,因此您无需访问设备库。
但是,如果您使用InAppBrowser Plugin打开这样的新窗口
var ref = window.open('http://www.yoursubwindow.com', '_blank')
然后你将无法截取ref
的截图。
原因:ref
不是普通的Javascript浏览器窗口,而是InAppBrowser
对象,对浏览器窗口的访问权限有限。特别是,您将无法访问Javascript window.navigator
对象,该对象在cordova屏幕截图插件中用于截取屏幕截图。
因此,如果您使用window.navigator.screenshot.save(...)
截取屏幕截图,它将始终截取基础窗口(主窗口)的屏幕截图,但从不使用ref
。
ref.navigator.screenshot.save(...)
将导致javascript错误,因为没有定义ref.navigator
。
我现在正在解决这个问题,但我还没有找到解决方案。所以,如果你找到一个,请告诉我!
这个PhoneGap插件应该可以帮助你:
cordova-screenshot
https://github.com/gitawego/cordova-screenshot
用法:
navigator.screenshot.save(function(error,res){
if(error){
console.error(error);
}else{
console.log('ok',res.filePath);
}
});
正如其在评论中所写,cordova-screenshot插件无法正常使用inAppBrowser。但您仍然可以在inAppBrowser插件代码中实现屏幕截图。 stackoverflow上已经有几种解决方案。我使用以下Android代码(编辑的InAppBrowser.java代码):
//在我的代码中,postmessage触发了功能,所以在一些postmessage上它将对象作为postMessage返回到cordova,我正在捕获并使用数据:image
public void screenShare(JSONObject obj) {
final WebView childView = inAppWebView;
Bitmap bitmap = Bitmap.createBitmap(childView.getWidth(), childView.getHeight(), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bitmap);
childView.draw(canvas);
int quality = 100;
ByteArrayOutputStream jpeg_data = new ByteArrayOutputStream();
if (bitmap.compress(CompressFormat.JPEG, quality, jpeg_data)) {
byte[] code = jpeg_data.toByteArray();
byte[] output = Base64.encode(code, Base64.NO_WRAP);
String js_out = new String(output);
js_out = "data:image/jpeg;base64," + js_out;
try {
obj.put("screen", js_out);
LOG.d(LOG_TAG, "screen result sending" );
sendUpdate(obj, true);
}catch (JSONException ex) {
LOG.e(LOG_TAG, "data screenshare object passed to postMessage has caused a JSON error.");
}
} else{
LOG.d(LOG_TAG, "No screen result " );
}
}
对于iOs,我编辑了CDVUIInappBrowser.m我正在使用postmessage以及功能触发器,我使用了以下代码:
//调用功能:
NSString *imageStr = [self getScreenshot5];
//返回数据:图像
- (NSString *)getScreenshot5
{
UIImage *viewImage = [self captureScreen:self.inAppBrowserViewController.view];
// For error information
NSError *error;
NSFileManager *fileMgr = [NSFileManager defaultManager];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0]; // Get documents folder
NSString *dataPath = [documentsDirectory stringByAppendingPathComponent:@"/IMG_FOLDER"];
if (![fileMgr fileExistsAtPath:dataPath])
[[NSFileManager defaultManager] createDirectoryAtPath:dataPath withIntermediateDirectories:NO attributes:nil error:&error]; //Create folder
//Get the current date and time and set as image name
NSDate *now = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
dateFormatter.dateFormat = @"yyyy-MM-dd_HH-mm-ss";
[dateFormatter setTimeZone:[NSTimeZone systemTimeZone]];
NSString *gmtTime = [dateFormatter stringFromDate:now];
NSLog(@"The Current Time is :%@", gmtTime);
NSData *imageData = UIImageJPEGRepresentation(viewImage, 0.9); // _postImage is your image file and you can use JPEG representation or PNG as your wish
int imgSize = imageData.length;
NSLog(@"SIZE OF IMAGE: %.2f Kb", (float)imgSize/1024);
NSString *imgfileName = [NSString stringWithFormat:@"%@%@", gmtTime, @".jpg"];
NSString *imgfilePath= [dataPath stringByAppendingPathComponent:imgfileName];
return imgfilePath;
}
-(UIImage*)captureScreen:(UIView*) viewToCapture
{
UIGraphicsBeginImageContext(viewToCapture.bounds.size);
[viewToCapture.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return viewImage;
}