Question

Caused by: android.os.NetworkOnMainThreadException
04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.io.IoBridge.connect(IoBridge.java:112)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.Socket.connect(Socket.java:842)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:76)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:340)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:316)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.connect(HttpEngine.java:311)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:290)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:240)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at libcore.net.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:81)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.URLConnection.getContent(URLConnection.java:190)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at java.net.URL.getContent(URL.java:447)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen$2.run(HomeScreen.java:199)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Activity.runOnUiThread(Activity.java:4644)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen.setview(HomeScreen.java:193)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at biz.xicom.printvintage.HomeScreen.onCreate(HomeScreen.java:58)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Activity.performCreate(Activity.java:5104)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
    04-25 13:15:52.362: E/AndroidRuntime(20900):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)

码

    for (int i = 0; i < image_list.size(); i++) {
        LayoutInflater layoutInflator = HomeScreen.this.getLayoutInflater();
        LinearLayout childlayout = (LinearLayout) layoutInflator.inflate(
                R.layout.image_text_web_services_inflate, mPager, false);
        im = (ImageView) childlayout.findViewById(R.id.image_web_service);
        t = (TextView) childlayout.findViewById(R.id.text_web_service);

        t.setText(HomeScreen.detail_list.get(i));
        final int j=i;
        runOnUiThread(new Runnable() {
            public void run(){   
                try {
                    Bitmap bitmap = BitmapFactory
                            .decodeStream((InputStream) new URL(
                                    HomeScreen.image_list.get(j))
                                    .getContent());
                    im.setImageBitmap(bitmap);
                } catch (MalformedURLException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        });

        mPager.addView(childlayout);
    }

我在下面看到链接：

Load More - Only the original thread that created a view hierarchy can touch its views

android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException

每个人都说

您正在尝试更新您的主UI线程或AsyncTask永远不允许这样做。

然后我可以更新或显示我的图片。

还可以尝试 AsyncTask 。 比如何实施循环

Answer 1

当您尝试在Loop中加载图像时，我建议您实现延迟加载图像的逻辑。

以下是一些您可以尝试的库：

Answer 2

使用此代码它会有帮助，

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);

Answer 3

您正在UI线程中调用Web服务。 Android不允许您在API＆gt; = 3.0的UI线程中执行网络操作。

解决方案：

将图像加载到其他线程中。

new Thread()
{
     @Override
     public void run() 
     {
        // load image here
        super.run();
     }
}.start();

使用LazyList可以很好地解决此问题。

您也可以使用AsyncTask。

class MyAsyncTask extends AsyncTask<String, String, String> {

@Override
protected void onPreExecute() {
 // Runs on UI thread- Any code you wants 
 // to execute before web service call. Put it here.
 // Eg show progress dialog
}
@Override
protected String doInBackground(String... params) {
  // Runs in background thread
    String result = //your web service request;         

     return result;
}

@Override
protected void onProgressUpdate(String... values) {
    super.onProgressUpdate(values);
}

@Override
protected void onPostExecute(String resp) {

  // runs in UI thread - You may do what you want with response 
  // Eg Cancel progress dialog - Use result         
}
}

更新主UI线程或AsyncTask绝不允许我在哪里更新UI线程？

3 个答案: