Android严格模式

概述我已经使用AsyncTask在JSON解析上编写了一个简单的代码.我只是在TextView中显示响应.我不知道这是对还是错.它在GingerBread上工作,并在JellyBean上显示NetworkOnMainThreadException.如果我使用StrictMode,则它可以在JellyBean上运行并在GingerBread上强制关闭.如何编写支持Androi

我已经使用AsyncTask在JSON解析上编写了一个简单的代码.我只是在TextVIEw中显示响应.我不知道这是对还是错.它在GingerBread上工作,并在JellyBean上显示networkonmainthreadException.如果我使用StrictMode,则它可以在JellyBean上运行并在GingerBread上强制关闭.如何编写支持Android 3.0以上和AndroID 3.0以下的代码.

public class MainActivity extends Activity {TextVIEw tv;button b;inputStream is = null;DefaulthttpClIEnt clIEnt;httpGet get;httpResponse response;httpentity entity;StringBuffer buffer;@Suppresslint("NewAPI")@TargetAPI(Build.VERSION_CODES.GINGERBREAD)@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    //StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();  //    StrictMode.setThreadPolicy(policy);    tv = (TextVIEw) findVIEwByID(R.ID.texty);    b = (button) findVIEwByID(R.ID.buttonGET);    b.setonClickListener(new VIEw.OnClickListener() {        @OverrIDe        public voID onClick(VIEw v) {            MyOperation mytask = new MyOperation();            mytask.execute();        }    });}private class MyOperation extends AsyncTask<String, VoID, String> {    ProgressDialog dialog = new ProgressDialog(MainActivity.this);    @OverrIDe    protected voID onPreExecute() {        // Todo auto-generated method stub        super.onPreExecute();        dialog.setMessage("Loading...");        dialog.show();    }    @OverrIDe    protected String doInBackground(String... params) {        // Todo auto-generated method stub        clIEnt = new DefaulthttpClIEnt();        get = new httpGet("http://www.Google.com");        try {            response = clIEnt.execute(get);        } catch (ClIEntProtocolException e) {            // Todo auto-generated catch block            e.printstacktrace();        } catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }        entity = response.getEntity();        try {            is = entity.getContent();        } catch (IllegalStateException e) {            // Todo auto-generated catch block            e.printstacktrace();        } catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }        return null;    }    @OverrIDe    protected voID onPostExecute(String result) {        // Todo auto-generated method stub        super.onPostExecute(result);        dialog.dismiss();        BufferedReader reader = new BufferedReader(                new inputStreamReader(is));        StringBuffer buffer = new StringBuffer();        String line = null;        do {            try {                line = reader.readline();            } catch (IOException e) {                // Todo auto-generated catch block                e.printstacktrace();            }            buffer.append(line);        } while (line != null);        tv.setText(buffer);    }}

}

解决方法:

   public class MainActivity extends Activity {     TextVIEw tv;    button b;    inputStream is = null;    DefaulthttpClIEnt clIEnt;    httpGet get;    httpResponse response;httpentity entity;StringBuffer buffer;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    //StrictMode.ThreadPolicy policy = new   //    StrictMode.setThreadPolicy(policy);    tv = (TextVIEw) findVIEwByID(R.ID.texty);    b = (button) findVIEwByID(R.ID.buttonGET);    b.setonClickListener(new VIEw.OnClickListener() {        @OverrIDe        public voID onClick(VIEw v) {            MyOperation mytask = new MyOperation();            mytask.execute();        }    });}private class MyOperation extends AsyncTask<String, VoID, String> {    ProgressDialog dialog = new ProgressDialog(MainActivity.this);    @OverrIDe    protected voID onPreExecute() {        // Todo auto-generated method stub        super.onPreExecute();        dialog.setMessage("Loading...");        dialog.show();    }    @OverrIDe    protected String doInBackground(String... params) {StringBuffer buffer = new StringBuffer();        // Todo auto-generated method stub        clIEnt = new DefaulthttpClIEnt();        get = new httpGet("http://www.Google.com");        try {            response = clIEnt.execute(get);        } catch (ClIEntProtocolException e) {            // Todo auto-generated catch block            e.printstacktrace();        } catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }        entity = response.getEntity();        try {            is = entity.getContent();        } catch (IllegalStateException e) {            // Todo auto-generated catch block            e.printstacktrace();        } catch (IOException e) {            // Todo auto-generated catch block            e.printstacktrace();        }    BufferedReader reader = new BufferedReader(                new inputStreamReader(is));        String line = null;        do {            try {                line = reader.readline();            } catch (IOException e) {                // Todo auto-generated catch block                e.printstacktrace();            }            buffer.append(line);        } while (line != null);        return buffer.tostring();    }    @OverrIDe    protected voID onPostExecute(String result) {        // Todo auto-generated method stub        super.onPostExecute(result);        dialog.dismiss();        tv.setText(result);    }}}

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