无法读取的PhoneGap从SD卡的图像文件：机器人机器人、图像文件、PhoneGap、SD

2023-09-05 10:43:14 作者：借我、你的一輩子

我是个PhoneGap的新手。我想读取和SD卡中的Android使用的图像文件 PhoneGap的官方教程。问题是，没有被显示的图象，而不是一个问号出现在它的位置。

I am a phonegap newbie. I am trying to read and image file from sdcard in android using phonegap official tutorial. The problem is that the image is not being displayed instead a question mark appears in its place.

我的code：

My Code:

var pictureSource;  
var destinationType;  


document.addEventListener("deviceready",onDeviceReady,false);


function onDeviceReady(){ 

   document.getElementById("test").innerHTML="onready about to request";
   window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, onFail);}





function onFail(message) {
  alert('Failed because: ' + message);
}
function gotFS(fileSystem) {
    fileSystem.root.getFile("1.jpg", null, gotFileEntry, fail);
}

function gotFileEntry(fileEntry) {
    fileEntry.file(gotFile, fail);
}

function gotFile(file){
    readDataUrl(file);

}

function readDataUrl(file) {
     var reader = new FileReader();
    reader.onloadend = function(evt) {
        console.log("Read as data URL");
        console.log(evt.target.result);

    };  
    document.getElementById("smallImage").style.display='block'; 
    document.getElementById("smallImage").src = reader.readAsDataURL(file);

}



function fail(evt) {
    console.log(evt.target.error.code);
}



</script>

编辑：使用API 16分钟，sdk8 smallImage是一个标记它的正常工作与onphotodatasuccess。这样，摄像头是不是一个问题在这里。一切有关相机功能就可以了。从SD卡读取的赋值语句产生问题。的document.getElementById（smallImage）的src = reader.readAsDataURL（文件）。如果我添加此我得到的字符串和未知铬错误-6，否则我看到常用的影像转换成字符串。谢谢

edit: Using API 16 and min-sdk8 "smallImage" is a tag it's working fine with onphotodatasuccess. So, camera is not a problem here. Everything related to camera functions is ok. Reading from sdcard is posing a problem at the assignment statement. document.getElementById("smallImage").src = reader.readAsDataURL(file); if I add this i get the string and unknown chromium error -6, else i see the usual image converted string. Thanks

推荐答案

下面是一个工作的例子：

Here is a working example :

编辑：

<!DOCTYPE html>
<html>
  <head>
    <title>Pick Photo</title>

    <script type="text/javascript" charset="utf-8" src="cordova-2.2.0.js"></script>
    <script type="text/javascript" charset="utf-8">

    document.addEventListener("deviceready",onDeviceReady,false);

    function onDeviceReady() {
       window.requestFileSystem(LocalFileSystem.PERSISTENT, 0, gotFS, onFail);
    }

     function onFail(message) {
      alert('Failed because: ' + message);
    }

    function gotFS(fileSystem) {
        fileSystem.root.getFile("1.jpg", {create: true}, gotFileEntry, fail);
    }

    function gotFileEntry(fileEntry) {
        fileEntry.file(gotFile, fail);
    }

    function gotFile(file){
        readDataUrl(file);  
    }

    function readDataUrl(file) {
           var reader = new FileReader();
           reader.onloadend = function(evt) {
           console.log("Read as data URL");
           console.log(evt.target.result);
           document.getElementById("smallImage").style.display='block'; 
           document.getElementById("smallImage").src = evt.target.result;   
        }; 
        reader.readAsDataURL(file);
    }

    function fail(evt) {
        console.log(evt.target.error.code);
    }
    </script>
  </head>
  <body>
    <img style="display:none;width:60px;height:60px;" id="smallImage" src="" />
    <img style="display:none;" id="largeImage" src="" />
  </body>
</html>

这将允许您挑选任何指定的图像从SD卡。

This will allow you to pick any specified image from sdcard.

希望这有助于你。

感谢。

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