从其他线程更改视图 [英] Change View from other thread

问题描述

我写了一个code，从互联网上下载的图像。我必须表明它在的ImageView 这是动态创建的。

和我得到的只有创建视图层次可以触摸其观点原来的线程错误。我知道我必须写一个手柄，但我怎么能做到这一点？

下面是我的code：

 公共类ResimCek实现Runnable {        INT resimID = 0;        公共ResimCek（INT parcaID）{
            //存储参数供以后用户
            resimID = parcaID;
        }        公共无效的run（）{            INT渣油= getResources（）则getIdentifier（Integer.toString（resimID），标签，getPackageName（））;
            ImageView的resim =（ImageView的）findViewById（渣油）;            绘制的图像= ImageOperations（getBaseContext（），http://141.11.11.206/parca/+ Integer.toString（resimID）+.JPG，I+ Integer.toString（resimID）+.JPG） ;            //我得到ERROR HERE ******************
            resim.setImageDrawable（图片）; // ********
        }
    }    私人绘制对象ImageOperations（上下文CTX，URL字符串，字符串saveFilename）{
        尝试{
            InputStream为=（InputStream的）this.fetch（URL）;
            可绘制D = Drawable.createFromStream（新网址（URL）.openConnection（）的getInputStream（），saveFilename）;
            返回D组;
        }赶上（MalformedURLException的E）{
            e.printStackTrace（）;
            返回null;
        }赶上（IOException异常五）{
            e.printStackTrace（）;
            返回null;
        }
    }    公共对象获取（字符串地址）抛出MalformedURLException的，IOException异常{
        网址URL =新的URL（地址）;
        对象内容= url.getContent（）;
        返回的内容;
    }
    私人无效MalzemeEkle（字符串malzemeKodu，字符串malzemeTanimi）{
        ImageView的parcaresmi =新ImageView的（本）;
        parcaresmi.setId（的Integer.parseInt（malzemeKodu））;
        Runnable接口R =新ResimCek（的Integer.parseInt（malzemeKodu））;
        新的Thread（R）。开始（）;
}
 

解决方案

 公共类ResimCek实现Runnable {        INT resimID = 0;        公共ResimCek（INT parcaID）{
            //存储参数供以后用户
            resimID = parcaID;
        }        公共无效的run（）{            INT渣油= getResources（）则getIdentifier（Integer.toString（resimID），标签，getPackageName（））;
            ImageView的resim =（ImageView的）findViewById（渣油）;            绘制的图像= ImageOperations（getBaseContext（），http://141.11.11.206/parca/+ Integer.toString（resimID）+.JPG，I+ Integer.toString（resimID）+.JPG） ;            //我得到ERROR HERE ******************
            resim.setImageDrawable（图片）; // ********
        }
    }新的处理程序（）后（新ResimCek（的Integer.parseInt（malzemeKodu）））;而不是新的Thread（R）。开始（）;
 

任何情况下，如果这是一个活动..然后

  runOnUIThread（新ResimCek（的Integer.parseInt（malzemeKodu）））; `，而不是新的Thread（R）。开始（）;`
 

也将工作..

I wrote a code to download an image from internet. And i have to show it in a ImageView which is dynamically created.

And i am getting an error that Only the original thread that created a view hierarchy can touch its views. I know i have to write a handle but how can i do that?

Here is my code:

public class ResimCek implements Runnable {

        int resimID = 0;

        public ResimCek(int parcaID) {
            // store parameter for later user
            resimID = parcaID;
        }

        public void run() {

            int resID = getResources().getIdentifier(Integer.toString(resimID) , "tag", getPackageName()); 
            ImageView resim = (ImageView) findViewById(resID);

            Drawable image = ImageOperations(getBaseContext(),"http://141.11.11.206/parca/" + Integer.toString(resimID) + ".jpg" ,"I" + Integer.toString(resimID) + ".jpg");

            // I AM GETTING ERROR HERE ******************
            resim.setImageDrawable(image); // *************************
        }
    }

    private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
        try {
            InputStream is = (InputStream) this.fetch(url);
            Drawable d = Drawable.createFromStream(new URL(url).openConnection().getInputStream(),saveFilename);
            return d;
        } catch (MalformedURLException e) {
            e.printStackTrace();
            return null;
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }

    public Object fetch(String address) throws MalformedURLException,IOException {
        URL url = new URL(address);
        Object content = url.getContent();
        return content;
    }
    private void MalzemeEkle(String malzemeKodu, String malzemeTanimi) {
        ImageView parcaresmi = new ImageView(this);
        parcaresmi.setId(Integer.parseInt(malzemeKodu));
        Runnable r = new ResimCek(Integer.parseInt(malzemeKodu)); 
        new Thread(r).start(); 
}

解决方案

public class ResimCek implements Runnable {

        int resimID = 0;

        public ResimCek(int parcaID) {
            // store parameter for later user
            resimID = parcaID;
        }

        public void run() {

            int resID = getResources().getIdentifier(Integer.toString(resimID) , "tag", getPackageName()); 
            ImageView resim = (ImageView) findViewById(resID);

            Drawable image = ImageOperations(getBaseContext(),"http://141.11.11.206/parca/" + Integer.toString(resimID) + ".jpg" ,"I" + Integer.toString(resimID) + ".jpg");

            // I AM GETTING ERROR HERE ******************
            resim.setImageDrawable(image); // *************************
        }
    }



new Handler().post(new ResimCek(Integer.parseInt(malzemeKodu))); instead of new Thread(r).start(); 

by any case if this is an Activity.. then

runOnUIThread(new ResimCek(Integer.parseInt(malzemeKodu))); `instead of new Thread(r).start();` 

will also work..

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