Question

我＆＃39;我试图通过HTTP请求从谷歌获取数据：

主要

public class MainActivity extends ActionBarActivity {
TextView httpStuff;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.httpexample);
    httpStuff = (TextView) findViewById(R.id.httpText);
    HTTP test = new HTTP();
    String returned = null;
    try {
        returned = test.getInternetData();
        httpStuff.setText(returned);
    } catch (Exception e) {com
        e.printStackTrace();
    }
}
}

HTTP clas如下：

public class HTTP {

public String getInternetData() throws Exception{
    BufferedReader in = null;
    String data = null;
    try{
        HttpClient client = new DefaultHttpClient();
        URI website = new URI("http://www.google.net");
        HttpGet request = new HttpGet();
        request.setURI(website);
        HttpResponse response = client.execute(request);
        in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
        StringBuffer sb = new StringBuffer("");
        String l = "";
        String nl = System.getProperty("line.separator");
        while((l = in.readLine()) !=null){
            sb.append(l + nl );
        }
        in.close();
        data = sb.toString();
        return data;
    }finally {
        if (in != null){
            try{
                in.close();
                return data;

            }catch (Exception  e){
                e.printStackTrace();
            }
        }
    }
}

}

这是控制台logcat：

04-27 19：31：58.063 2167-2191 / com.example.briesanji.test D / OpenGLRenderer：渲染所请求的脏区：true 04-27 19：31：58.065 2167-2167 / com.example.briesanji.test D /：HostConnection :: get（）建立新主机连接0xa687c600，tid 2167 04-27 19：31：58.103 2167-2167 / com.example.briesanji.test D / Atlas：验证地图...... 04-27 19：31：58.196 2167-2191 / com.example.briesanji.test D /：HostConnection :: get（）建立新的主机连接0xa687c7c0，tid 2191 04-27 19：31：58.207 2167-2191 / com.example.briesanji.test I / OpenGLRenderer：初始化的EGL，版本1.4 04-27 19：31：58.283 2167-2191 / com.example.briesanji.test D / OpenGLRenderer：启用调试模式0 04-27 19：31：58.334 2167-2191 / com.example.briesanji.test W / EGL_emulation：eglSurfaceAttrib未实现 04-27 19：31：58.334 2167-2191 / com.example.briesanji.test W / OpenGLRenderer：无法在表面0xa6868780上设置EGL_SWAP_BEHAVIOR，错误= EGL_SUCCESS

TextView不显示数据但仍保留其默认文本（＆＃34;加载数据＆＃34;）我曾尝试用httpStuff.setText(returned);更改httpStuff.setText("hello");，但没有任何内容，所以我认为这是布局问题，然后我从try方法中取出httpStuff.setText("hello");并显示Hello ..所以问题是当然，尝试方法，但我不知道我错在哪里

Answer 1

您的代码无效，因为尝试在其主线程上执行网络操作。因此，您会收到NetworkOnMainThreadException

解决此问题的最简单方法是使用AsyncTask：

public class SampleActivity extends Activity {

    TextView httpStuff;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sample);

        httpStuff = (TextView) findViewById(R.id.add_button);
        new DownloadInternetData().execute();
    }

    public class DownloadInternetData extends AsyncTask<Void, Void, String>{

        @Override
        protected String doInBackground(Void... voids) {
            BufferedReader in = null;
            String data = null;
            try {
                HttpClient client = new DefaultHttpClient();
                URI website = new URI("http://www.google.net");
                HttpGet request = new HttpGet();
                request.setURI(website);
                HttpResponse response = client.execute(request);
                in = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));
                StringBuffer sb = new StringBuffer("");
                String l = "";
                String nl = System.getProperty("line.separator");
                while ((l = in.readLine()) != null) {
                    sb.append(l + nl);
                }
                in.close();
                data = sb.toString();
                return data;
            } catch (Exception e) {
                e.printStackTrace();
            } finally {
                if (in != null) {
                    try {
                        in.close();
                        return data;

                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                }
            }

            return "";
        }

        @Override
        protected void onPostExecute(String result) {
            httpStuff.setText(result);
        }
    }
}

我的TextView [android]上没有显示Http数据

1 个答案: