求助：AsyncTask中无法调用mainActivity中的变量？

Umbra_sccc 2019-03-22 11:42:50

import android.content.Intent;

import android.graphics.Bitmap;

import android.graphics.BitmapFactory;

import android.os.AsyncTask;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.ImageView;

import android.widget.TextView;



import java.io.ByteArrayInputStream;

import java.io.ByteArrayOutputStream;

import java.io.DataInputStream;

import java.io.DataOutputStream;

import java.io.IOException;

import java.net.Socket;



public class SearchActivity extends AppCompatActivity {

    public Bitmap bm = null;









    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_search);

        TextView textView1 = (TextView) findViewById(R.id.result_text_1);

        ImageView picture1 = (ImageView) findViewById(R.id.result_pic_1);

        TextView textView2 = (TextView) findViewById(R.id.result_text_2);

        ImageView picture2 = (ImageView) findViewById(R.id.result_pic_2);

        TextView textView3 = (TextView) findViewById(R.id.result_text_3);

        ImageView picture3 = (ImageView) findViewById(R.id.result_pic_3);







        Button send = (Button)findViewById(R.id.send);

        textView1.setText("try_1:hhh");

        textView2.setText("try2:我买了一个iphonexxx");

        textView3.setText("try3:ttt");

        Intent intent = this.getIntent();

        byte buffer[] = intent.getByteArrayExtra("image");

        bm = BitmapFactory.decodeByteArray(buffer,0,buffer.length); // 解码文件

        Log.w("TAG", "size: " + bm.getByteCount() + " width: " + bm.getWidth() + " heigth:" + bm.getHeight()); // 输出图像数据



        picture1.setImageBitmap(bm);

        picture2.setImageBitmap(bm);

        picture3.setImageBitmap(bm);



        send.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                new SendPicture().execute(bm);

            }

        });

        //Bitmap bitmap = BitmapFactory.decodeByteArray(buffer, 0, buffer.length);

        //picture1.setImageBitmap(bitmap);

    }

    class SendPicture extends AsyncTask<Bitmap,Void,Bitmap>{

        private static final String SOCKET_IP = "10.30.73.82";

        private static final int SOCKET_PORT = 8000;

        private Bitmap bmp;

        private DataOutputStream dataOutputStream = null;

        private ByteArrayOutputStream out = null;

        private DataInputStream dataInputStream = null;

        private ByteArrayInputStream in = null;



        @Override

        protected void onPreExecute() {

            super.onPreExecute();

        }



        @Override

        protected Bitmap doInBackground(Bitmap... bitmaps) {

            Bitmap bitmap = bitmaps[0];

            try{

                Socket socket = new Socket(SOCKET_IP,SOCKET_PORT);

                dataOutputStream = new DataOutputStream(socket.getOutputStream());

                out = new ByteArrayOutputStream();

                bitmap.compress(Bitmap.CompressFormat.JPEG,100,out);

                byte[] sendBytes = out.toByteArray();

                int size = sendBytes.length;

                dataOutputStream.writeInt(size);

                dataOutputStream.flush();

                dataOutputStream.write(sendBytes);

                dataOutputStream.flush();

                //dataOutputStream.close();

                dataInputStream = new DataInputStream(socket.getInputStream());

                try {

                    size = dataInputStream.readInt();

                }catch (IOException e){

                    e.printStackTrace();

                }

                byte[] receiveBytes = new byte[size];

                int hasReceived = 0;

                while (hasReceived <size){

                    hasReceived+=dataInputStream.read(receiveBytes,hasReceived,size-hasReceived);

                }

                bmp = BitmapFactory.decodeByteArray(receiveBytes, 0,receiveBytes.length);







            }catch (Exception e){

                e.printStackTrace();

            }



            return bmp;

        }



        @Override

        protected void onPostExecute(Bitmap bmp) {

                             textView1.setText("try_1:hhh");

                     

        }

    }

}

做了个app，要从服务器接收一个图片然后显示。
现在我在onPostExecute中调用picture1.setImageBitmap（bmp）
显示找不到picture1这个变量，为什么啊，更新UI再onPostExecute里面没错吧？！
而且如果在里面调用textView1.setText("try_1:hhh");也是显示没有找到变量

总之，问题就是在onPostExecute里无法更新UI，找不到之前定义的变量？

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