如何在asyncTask中显示吐司消息doingbackground或onPostExecute

Question

package kr.phpdev.call; 

import android.content.BroadcastReceiver; 
import android.content.Context; 
import android.content.Intent; 
import android.os.AsyncTask; 
import android.os.Bundle; 
import android.os.Handler; 
import android.telephony.PhoneNumberUtils; 
import android.telephony.PhoneStateListener; 
import android.telephony.TelephonyManager; 
import android.util.Log; 
import android.widget.Toast; 


import okhttp3.FormBody; 
import okhttp3.OkHttpClient; 
import okhttp3.Request; 
import okhttp3.RequestBody; 
import okhttp3.Response; 


public class PhoneStateReceiver extends BroadcastReceiver { 
    static String mLastState; 
    static final String TAG = "Call Manager"; 
    final OkHttpClient client = new OkHttpClient(); 


@Override 
public void onReceive(Context context, Intent intent) { 

    CallReceivedChk(context, intent); 


} 

private void CallReceivedChk(Context context, Intent intent) { 


    TelephonyManager telephony = (TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE); 

    telephony.listen(new PhoneStateListener() { 
     @Override 
     public void onCallStateChanged(int state, String incomingNumber) { 
      String mState = String.valueOf(state); 
      if (mState.equals(mLastState)) { // 두번 호출되는 문제 해결 목적 
       return; 
      } else { 
       mLastState = mState; 
      } 

      switch (state) { 
       case TelephonyManager.CALL_STATE_IDLE: 
        Log.d(TAG, "CALL_IDLE"); 
        break; 
       case TelephonyManager.CALL_STATE_OFFHOOK: 
        Log.d(TAG, "CALL_OFFHOOK"); 
        break; 
       case TelephonyManager.CALL_STATE_RINGING: 
        Log.d(TAG, "CALL_RINGING >>> " + PhoneNumberUtils.formatNumber(incomingNumber)); 
        RequestBody formBody = new FormBody.Builder() 
          .add("pn", PhoneNumberUtils.formatNumber(incomingNumber)) 
          .build(); 
        final Request request = new Request.Builder() 
          .url("http://phpdev.kr/cm/logsend.php") 
          .post(formBody) 
          .build(); 

        AsyncTask<String, String, String> asyncTask = new AsyncTask<String, String, String>() { 


         @Override 
         protected void onPreExecute() { 

          super.onPreExecute(); 

         } 

         @Override 
         protected String doInBackground(String... params) { 
          try { 
           Response response = client.newCall(request).execute(); 
           if (!response.isSuccessful()) { 
            return null; 
           } 
           return response.body().string(); 


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


         @Override 
         protected void onPostExecute(String s) { 
          super.onPostExecute(s); 
          if (s != "FAILED") { 


           Log.d(TAG, s); 
           Toast.makeText(getApplicationContext(), "토스트메시지입니다.", Toast.LENGTH_SHORT).show(); 

          } 
         } 

        }; 

        asyncTask.execute(); 
        break; 
      } 
     } 
    }, PhoneStateListener.LISTEN_CALL_STATE); 
    } 

    } 

如何获取吐司消息？

Answer 1

使用Toast.makeText（背景下， “토스트메시지입니다。” Toast.LENGTH_SHORT）.show（）;`

@Override 
    protected void onPostExecute(String s) { 
     super.onPostExecute(s); 
     if (s != "FAILED") { 


     Log.d(TAG, s); 
     Toast.makeText(context, "토스트메시지입니다.", Toast.LENGTH_SHORT).show(); 

     } 
    } 

Answer 2

你需要做的是在onPostExecute因为它是在UI线程上运行。并且还用Java字符串比较是像s.equals("Failed")：

@Override 
        protected void onPostExecute(String s) { 
         super.onPostExecute(s); 
         if (!s.equals("FAILED")) { 


          Log.d(TAG, s); 
          Toast.makeText(context, "토스트메시지입니다.", Toast.LENGTH_SHORT).show(); 

         } 
        } 

Answer 3

错误：（103，68）错误：局部变量上下文从内部类访问;需要被宣布为最终。你只需要使用“context”而不是“getApplicationContext（）”。