Class Overview

The exception that is thrown when an application attempts to perform a networking operation on its main thread.

This is only thrown for applications targeting the Honeycomb SDK or higher. Applications targeting earlier SDK versions are allowed to do networking on their main event loop threads, but it's heavily discouraged. See the document Designing for Responsiveness.

Also see StrictMode.

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        this.setContentView(R.layout.test);

        // 开启一个子线程，进行网络操作，等待有返回结果，使用handler通知UI

        new Thread(networkTask).start();

    }

    Handler handler = new Handler() {

        @Override

        public void handleMessage(Message msg) {

            super.handleMessage(msg);

            Bundle data = msg.getData();

            String val = data.getString("value");

            Log.i("mylog", "请求结果为-->" + val);

            // TODO

            // UI界面的更新等相关操作

        }

    };

    /**

     * 网络操作相关的子线程

     */

    Runnable networkTask = new Runnable() {

        @Override

        public void run() {

            // TODO

            // 在这里进行 http request.网络请求相关操作

            Message msg = new Message();

            Bundle data = new Bundle();

            data.putString("value", "请求结果");

            msg.setData(data);

            handler.sendMessage(msg);

        }

    };

class DownImage extends AsyncTask {

    private ImageView imageView;

    public DownImage(ImageView imageView) {

        this.imageView = imageView;

    }

    @Override

    protected Bitmap doInBackground(String... params) {

        String url = params[];

        Bitmap bitmap = null;

        try {

            //加载一个网络图片

            InputStream is = new URL(url).openStream();

            bitmap = BitmapFactory.decodeStream(is);

        } catch (Exception e) {

            e.printStackTrace();

        }

        return bitmap;

    }

    @Override

    protected void onPostExecute(Bitmap result) {

        imageView.setImageBitmap(result);

    }

}

        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()

                .detectDiskReads().detectDiskWrites().detectNetwork()

                .penaltyLog().build());

        StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()

                .detectLeakedSqlLiteObjects().detectLeakedClosableObjects()

                .penaltyLog().penaltyDeath().build());