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Thread 发送的消息,handler 接收不到 1.主activity 里面接收处理消息 package com.example.administrator.myapplication; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity import android.os.Bundle; import android.content.Context; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import android.util.*; import android.util.Log; import android.app.Application; import android.app.Activity; import android.os.Bundle; import android.text.TextUtils; import android.view.View; import android.widget.EditText; public class MainActivity extends AppCompatActivity { public static MainActivity context; // handleMessage接收并处理信息 private Handler handler = new Handler() public void handleMessage(Message msg) { Log.i("子此案从2:","子线程"+msg); switch (msg.what){ case 1: Log.i("子此案从3:","子线程"+msg); Toast toast= Toast.makeText(MainActivity.this,msg.obj.toString(),Toast.LENGTH_LONG); break; } } }; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); handlerThreadmsg.threadsendmsg("123"); context=this; } } 2.在另外一个类里面新建一个线程,发送消息 package com.example.administrator.myapplication; import android.app.AlertDialog; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.widget.Button; import android.widget.TextView; import android.support.v7.app.AppCompatActivity; //import android.support.v7.app.AlertDialog; //import android.content.DialogInterface; import android.os.Bundle; import android.content.Context; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.WindowManager; import android.widget.Button; import android.widget.ImageView; import android.widget.TextView; import android.widget.Toast; import android.util.*; import android.util.Log; import android.app.Application; import android.app.Activity; import android.os.Bundle; import android.text.TextUtils; import android.view.*; import android.widget.EditText; /** * Created by Administrator on 2023/4/2. */ public class handlerThreadmsg { private static Handler handler=new Handler(); public static void threadsendmsg(final String msg1) { Log.i("子此案从0:","子线程"+msg1); new Thread(new Runnable() { public void run() Message msg = Message.obtain(); msg.obj = msg1; Log.i("子此案从1:","子线程"+msg1); msg.what = 1; //子线程发送消息 handler.sendMessage(msg);//发送消息到handler Log.i("子此案从1-1:","子线程"+msg1); } }).start(); } }
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