有時候確實知道本地圖片地址,要獲取到base64
/**
* 獲取本地圖片,包含路徑和壓縮後的 base64
*/
(function (cordova) {
var define = cordova.define;
define("cordova/plugin/localImage", function (require, exports, module) {
var argscheck = require('cordova/argscheck'),
exec = require('cordova/exec');
exports.getImage = function (localFileUrl, successCB, failCB) {
exec(successCB, failCB, "LocalImage", "getImage", [localFileUrl]);
};
});
cordova.addConstructor(function () {
if (!window.plugins) {
window.plugins = {};
}
console.log("將插件注入localImage...");
window.plugins.localImage = cordova.require("cordova/plugin/localImage");
console.log("localImage注入結果:" + typeof (window.plugins.localImage));
});
})(cordova);
android
public class LocalImagePlugin extends CordovaPlugin {
@Override
public boolean execute(String action, JSONArray args,
CallbackContext callbackContext) throws JSONException {
if ("getImage".equals(action)) {
String localFileUrl = args.getString(0).replace("file:///", "/");
// Log.i("our", localFileUrl);
String file = "{\"path\":\"" + localFileUrl + "\",\"data\":\""
+ bitmapToString(localFileUrl) + "\"}";
// Log.i("our", file);
callbackContext.success(file);
return true;
} else {
return false;
}
}
public static String bitmapToString(String filePath) {
Bitmap bm = getSmallBitmap(filePath);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
bm.compress(Bitmap.CompressFormat.JPEG, 50, baos);
byte[] b = baos.toByteArray();
return Base64.encode(b);
}
// 根據路徑獲得圖片並壓縮,返回bitmap用於顯示
public static Bitmap getSmallBitmap(String filePath) {
final BitmapFactory.Options options = new BitmapFactory.Options();
options.inJustDecodeBounds = true;
BitmapFactory.decodeFile(filePath, options);
// Calculate inSampleSize
options.inSampleSize = calculateInSampleSize(options, 480, 800);
// Decode bitmap with inSampleSize set
options.inJustDecodeBounds = false;
return BitmapFactory.decodeFile(filePath, options);
}
// 計算圖片的縮放值
public static int calculateInSampleSize(BitmapFactory.Options options,
int reqWidth, int reqHeight) {
final int height = options.outHeight;
final int width = options.outWidth;
int inSampleSize = 1;
if (height > reqHeight || width > reqWidth) {
final int heightRatio = Math.round((float) height
/ (float) reqHeight);
final int widthRatio = Math.round((float) width / (float) reqWidth);
inSampleSize = heightRatio < widthRatio ? heightRatio : widthRatio;
}
return inSampleSize;
}
}
iOS
#import <UIKit/UIKit.h>
#import <Cordova/CDV.h>
@interface CDVLocalImage: CDVPlugin
@property (nonatomic,copy) NSString*callbackID;
//Instance Method
-(void) getImage:(CDVInvokedUrlCommand*)command ;
@end
#import "CDVLocalImage.h"
#import "TencentOpenAPI/QQApiInterface.h"
#import <TencentOpenAPI/TencentOAuth.h>
@implementation CDVLocalImage
@synthesize callbackID;
-(void)getImage:(CDVInvokedUrlCommand *)command
{
//url
NSString* localImageUrl = [command.arguments objectAtIndex:0];
localImageUrl =[localImageUrl stringByReplacingOccurrencesOfString:@"file://" withString:@""];
NSData *mydata=UIImageJPEGRepresentation([UIImage imageWithContentsOfFile:localImageUrl], 0.5);
NSString *pictureDataString=[mydata base64Encoding];
NSString *file =[NSString stringWithFormat:@"{\"path\":\"%@\",\"data\":\"%@\"}", localImageUrl,pictureDataString];
// NSLog(@"selected >>>>%@",file);
CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:file];
[self.commandDelegate sendPluginResult:pluginResult callbackId:command.callbackId];
}
@end