Android HttpUrlConnection 简单网站连接

Question

我想检查我的 apache-server 中的本地网站是否已启动并且可以访问。如果阅读了无数关于 HttpUrlconnection 的线程并提出了以下代码。 list Internet 权限已设置。该网站目前正在运行，我可以通过我的智能手机网络浏览器访问它。我还阅读了有关输入和输出流的内容，我的任务需要它们吗？

public class MainActivity extends AppCompatActivity {

    boolean value;

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

        state(value);
    }

    public boolean state(boolean value){
        try {
            URL url = new URL("http://192.168.178.59:8090/");
            HttpURLConnection httpURLConnection = (HttpURLConnection) url.openConnection();
            httpURLConnection.setRequestMethod("HEAD");
            httpURLConnection.setConnectTimeout(3000);
            httpURLConnection.setReadTimeout(3000);
            value = true;
            Toast.makeText(MainActivity.this,"true",Toast.LENGTH_SHORT).show();
            return value;
        } catch (MalformedURLException e) {
            e.printStackTrace();
            value = false;
            Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
            return value;
        } catch (IOException e) {
            e.printStackTrace();
            value = false;
            Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
            return value;
        }
    }
}

编辑:异常解决方案

import java.net.HttpURLConnection;

import android.os.AsyncTask;

public class MainActivity extends AppCompatActivity {

    boolean value;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new HttpTask().execute(value);

    }

    private class HttpTask extends AsyncTask<Boolean, Void, Boolean>
    {

        @Override
        protected Boolean doInBackground(Boolean... params) {
            // TODO Auto-generated method stub
            boolean value=params[0];
            try {
                URL url = new URL("http://192.168.178.59:8090/");
                HttpURLConnection httpURLConnection = (HttpURLConnection)     url.openConnection();
                httpURLConnection.setRequestMethod("HEAD");
                httpURLConnection.setConnectTimeout(3000);
                httpURLConnection.setReadTimeout(3000);
                httpURLConnection.connect();
                value = true;
            //Toast.makeText(MainActivity.this,"true",Toast.LENGTH_SHORT).show();
                return value;
            } catch (MalformedURLException e) {
                e.printStackTrace();
                value = false;
            //Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
                return value;
            } catch (IOException e) {
                e.printStackTrace();
                value = false;
            //Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
                return value;
            }

    }

         @Override
         protected void onPostExecute(Boolean  result) {
             if(result){
               Toast.makeText(MainActivity.this,"true",Toast.LENGTH_SHORT).show(); 
             }
             else{
             Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
             }
         }

    }

}

编辑:服务解决方案

    @Override
            protected void onPostExecute(Boolean  result) {
                if(result){
                    Toast.makeText(NotifiyService.this,"true",Toast.LENGTH_SHORT).show();
                    //Notification in Status Bar
                    NotificationCompat.Builder builder = new NotificationCompat.Builder(NotifiyService.this);
                    builder.setSmallIcon(R.drawable.dummy);
                    Intent intent = new Intent(NotifiyService.this, Main22Activity.class);
                    intent.setAction(Intent.ACTION_MAIN);
                    intent.addCategory(Intent.CATEGORY_LAUNCHER);
                    intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    PendingIntent pendingIntent = PendingIntent.getActivity(NotifiyService.this,0,intent,0);
                    builder.setContentIntent(pendingIntent);
                    builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.drawable.dummy));
                    builder.setContentTitle(getResources().getString(R.string.newNotify));
                    builder.setContentText(getResources().getString(R.string.newNotify2));
                    NotificationManager notificationManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                    notificationManager.notify(1,builder.build());

                }
                else{
                    Toast.makeText(NotifiyService.this,"false",Toast.LENGTH_SHORT).show();
                }

Answer 1

用下面给定的代码替换您的代码。

import java.net.HttpURLConnection;

import android.os.AsyncTask;

public class MainActivity extends AppCompatActivity {

    boolean value;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        new HttpTask().execute(value);

    }

    private class HttpTask extends AsyncTask<Boolean, Void, Boolean>
    {

        @Override
        protected Boolean doInBackground(Boolean... params) {
            // TODO Auto-generated method stub
            boolean value=params[0];
            try {
                URL url = new URL("http://192.168.178.59:8090/");
                HttpURLConnection httpURLConnection = (HttpURLConnection)     url.openConnection();
                httpURLConnection.setRequestMethod("HEAD");
                httpURLConnection.setConnectTimeout(3000);
                httpURLConnection.setReadTimeout(3000);
                httpURLConnection.connect();
                value = true;
            //Toast.makeText(MainActivity.this,"true",Toast.LENGTH_SHORT).show();
                return value;
            } catch (MalformedURLException e) {
                e.printStackTrace();
                value = false;
            //Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
                return value;
            } catch (IOException e) {
                e.printStackTrace();
                value = false;
            //Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
                return value;
            }

    }

         @Override
         protected void onPostExecute(Boolean  result) {
             if(result){
               Toast.makeText(MainActivity.this,"true",Toast.LENGTH_SHORT).show(); 
             }
             else{
             Toast.makeText(MainActivity.this,"false",Toast.LENGTH_SHORT).show();
             }
         }

    }

}

编辑:

要在通知点击时启动新 Activity ，请在 Intent intent = new Intent(NotifiyService.this, Main22Activity.class); 之后添加以下行::

intent .setAction(Intent.ACTION_MAIN);
intent .addCategory(Intent.CATEGORY_LAUNCHER);
intent .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);