从AsynTask启动FragmentActivity

Question

这是我的类文件，它扩展了FragmentActivity。我不太确定我做得对不对。我想有一个选项卡式布局在这个活动，但应用程序不断崩溃。

        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_booking);

        viewPager = (ViewPager)findViewById(R.id.viewPager);
        viewPager.setAdapter(new CustomAdapter(getSupportFragmentManager(), getApplicationContext()));

        tabLayout = (TabLayout) findViewById(R.id.tabLayout);
        tabLayout.setupWithViewPager(viewPager);

        tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){

            @Override
            public void onTabSelected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabUnselected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }

            @Override
            public void onTabReselected(TabLayout.Tab tab) {
                viewPager.setCurrentItem(tab.getPosition());
            }
        });

    }

    private class CustomAdapter extends FragmentPagerAdapter {

        private String fragments [] = {"A","B"};

        public CustomAdapter(FragmentManager supportFragmentManager, Context applicationContext) {
            super(supportFragmentManager);

        }

        @Override
        public Fragment getItem(int position) {

            switch (position){
                case 0: return new fragment1();
                case 1: return new fragment2();
                default:return null;
            }


        }

        @Override
        public int getCount() {
            return fragments.length;
        }

        @Override
        public CharSequence getPageTitle(int position) {
            return fragments[position];
        }
    }


When I pass an intent from the AsynTask like so

    Intent intent;
    intent = new Intent(m_context, booking.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
    m_context.startActivity(intent);```

My app builds but crashes with the error

package com.example.webook.webook;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Looper;
import android.util.Log;
import android.widget.Toast;

import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.JsonRequest;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.google.android.gms.gcm.GoogleCloudMessaging;

import org.json.JSONObject;

import java.util.HashMap;
import java.util.Map;

/**
 * Created by bhargavpanth on 10/02/16.
 */
public class LoginAsyncTask extends android.os.AsyncTask<String, Integer, String>{

    Context m_context;
    String m_name,m_email,m_password;

    public LoginAsyncTask(Context context, String email, String pasword){
        m_context = context;
        m_email=email;
        m_password=pasword;

    }

    @Override
    protected String doInBackground(String... params) {
        Looper.prepare();
        try{
            final RequestQueue queue = Volley.newRequestQueue(m_context);
            JSONObject js = new JSONObject();
            try {
                JSONObject jsonobject_one = new JSONObject();
                JSONObject jsonobject = new JSONObject();
                jsonobject.put("csrf_token", "");
                js.put("params", jsonobject);

            }catch (Exception e) {
                e.printStackTrace();
            }
            //https://webook.trabacus.com/webook/csrf_token
            JsonObjectRequest jsonObjReq = new JsonObjectRequest(
                    Request.Method.POST,"https://webook.trabacus.com/webook/csrf_token", js,
                    new Response.Listener<JSONObject>() {
                        @Override
                        public void onResponse(JSONObject response) {
//                            Log.d("tagd", response.result.csrf_token());
                            try{
                                JSONObject ob=response.getJSONObject("result");
                                String csrf=ob.getString("csrf_token");
                                //rid,csrf,name,email,password
                                JSONObject js = new JSONObject();
                                try {
                                    JSONObject jsonobject = new JSONObject();
                                    jsonobject.put("csrf_token",csrf);
                                    jsonobject.put("login",m_email);
                                    jsonobject.put("password",m_password);
                                    jsonobject.put("db","Odoo-9");

                                    js.put("params", jsonobject);
                                    JsonObjectRequest jsonObjReq = new JsonObjectRequest(Request.Method.POST, "https://webook.trabacus.com/webook/login", js, new Response.Listener<JSONObject>() {
                                        @Override
                                        public void onResponse(JSONObject response) {
                                            Log.d("tagd", response.toString());
                                            Intent intent;
                                            intent = new Intent(m_context, booking.class);
                                            //intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                                            m_context.startActivity(intent);
                                        }
                                    },
                                            new Response.ErrorListener() {
                                                @Override
                                                public void onErrorResponse(VolleyError error) {
                                                    Log.d("tagd",error.toString());
                                                }
                                            }){
                                        @Override
                                        public Map<String, String> getHeaders(){
                                            HashMap<String,String> headers=new HashMap<>();
                                            headers.put("Content-Type","application/json; charset=utf-8");
                                            return headers;
                                        }

                                    };
                                    queue.add(jsonObjReq);

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

                                Log.d("tagd",ob.getString("csrf_token"));
                            }catch (Exception e){

                            }
//                            msgResponse.setText(response.toString());
//                            hideProgressDialog();
                        }
                    }, new Response.ErrorListener() {

                @Override
                public void onErrorResponse(VolleyError error) {
                    Log.d("tagd", "Error: " + error.getMessage());
//                    hideProgressDialog();
                }
            }) {

                /**
                 * Passing some request headers
                 */
                @Override
                public Map<String, String> getHeaders() {
                    HashMap<String, String> headers = new HashMap<String, String>();
                    headers.put("Content-Type", "application/json; charset=utf-8");
                    return headers;
                }
            };
            queue.add(jsonObjReq);
//            StringRequest sr = new StringRequest(Request.Method.POST, "https://webook.trabacus.com/webook/csrf_token", new Response.Listener<String>() {
//                @Override
//                public void onResponse(String response) {
//                    Log.d("tagd",response);
//                }
//            }, new Response.ErrorListener() {
//                @Override
//                public void onErrorResponse(VolleyError error) {
//                    Toast.makeText(m_context,error.toString(),Toast.LENGTH_LONG).show();
//                }
//            }){
//                @Override
//                protected Map<String, String> getParams(){
//                    Map<String,String> params = new HashMap<String, String>();
//                    params.put("csrf_token","");
//                    return params;
//                }
//
//                @Override
//                public Map<String, String> getHeaders(){
//                    Map<String,String> params = new HashMap<String, String>();
//                    params.put("Content-Type","application/x-www-form-urlencoded");
//                    return params;
//                }
//            };
//            queue.add();

        }catch (Exception e){
            Toast.makeText(m_context,e.toString(),Toast.LENGTH_LONG).show();
        }
        return null;
    }
}

```

Answer 1

doinbackground在非UI线程中运行。您不能在此进行ui操作。

在onpostexecute方法
中的push活动操作中使用此操作，或者使用以下操作

runOnUiThread (new Thread(new Runnable() { 
         public void run() {
             Intent intent= new Intent(m_context, booking.class);
    m_context.startActivity(intent);
         }
     }));