初学android开发 ，请问如何在主子线程间传递消息，请看详情

Question

我想在启动主activity后立即向thread发送消息并更新一个Textview,可是它并没有更新，而是在退出程序后(不是彻底结束)再返回activity是时才更新 为什么 一下是程序(有无关变量，请无视)
MainActivity
package com.example.administrator.a77777;

import android.content.Context;
import android.content.SharedPreferences;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
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.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
static Handler handler1=new Handler();
static Handler handler2=new Handler();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TextView textview=(TextView)findViewById(R.id.te);
Button btnObj = (Button) findViewById(R.id.bu);
final LooperThread looperThread = new LooperThread(this);
looperThread.start();
looperThread.handlert1.sendEmptyMessage(1);
handler2=new Handler(){
@Override
public void handleMessage(Message msg){
super.handleMessage(msg);
textview.setText(msg.obj.toString());
}
};
btnObj.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {

            looperThread.handler.sendEmptyMessage(1);

        }
    });
    handler1=new Handler(){
        @Override
        public void handleMessage(Message msg){
            textview.setText(msg.obj.toString());
        }
    };
}

}

Looperthread
package com.example.administrator.a77777;

import android.content.Context;
import android.content.SharedPreferences;
import android.database.sqlite.SQLiteDatabase;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.widget.TextView;

import com.example.administrator.a77777.MainActivity;
/**

• Created by Administrator on 2016/9/13.
  /
  class LooperThread extends Thread {
  public Handler handler=new Handler();
  static public Handler handlert1=new Handler();
  public static Context context;
  public LooperThread(Context con){
  context=con;
  }
  @Override
  public void run() {
  super.run();
  Looper.prepare();
  Text helper=new Text(context);
  final SQLiteDatabase db=helper.getWritableDatabase();
  /启动时更新数据*/
  QiDongGengXin();
  handlert1 = new Handler() {
  @Override
  public void handleMessage(Message msg) {
  super.handleMessage(msg);
  Message m=Message.obtain();
  m.obj="这是在启动时从子线程传来的消息";
  MainActivity.handler2.sendMessage(m);
  }
  };
  handler = new Handler() {
  @Override
  public void handleMessage(Message msg) {
  super.handleMessage(msg);
  Message m=Message.obtain();
  m.obj="这不是在启动时从子线程传来的消息";
  MainActivity.handler1.sendMessage(m);
  }
  };

  Looper.loop();//loop()会调用到handler的handleMessage(Message msg)方法，所以，写在下面；
  

  }
  public void QiDongGengXin(){
  String Szsy;
  SharedPreferences sp =context.getSharedPreferences("mrsoft",0);
  Szsy=sp.getString("restmoney","DULL");
  String S1= sp.getString("S1", "dull");
  String S2= sp.getString("S2", "dull");
  String S3= sp.getString("S3", "dull");
  String S4= sp.getString("S4", "dull");
  }
  }

Answer 1

http://www.cnblogs.com/jackhuclan/archive/2013/07/10/3182084.html