layout代码：
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" android:orientation="vertical" tools:context="com.example.my.myapplication.Testduoxianchen"> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="城市1" android:id="@+id/tv_3"/> <TextView android:layout_width="match_parent" android:layout_height="wrap_content" android:text="城市2" android:id="@+id/tv_4" /> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:onClick="bt1_onClick" android:text="启动" android:id="@+id/bt_1"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/tv_5" android:text="接收的消息"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="发消息" android:onClick="bt2_onClick"/> <TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="10" android:id="@+id/tv_6" android:layout_gravity="center"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="增加" android:id="@+id/bt_3" android:onClick="bt3_onClick"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="减少" android:id="@+id/bt_4" android:onClick="bt3_onClick"/> <Button android:layout_width="match_parent" android:layout_height="wrap_content" android:text="暂停" android:id="@+id/bt_5" android:onClick="bt3_onClick" android:enabled="falsea"/> </LinearLayout>
Activity代码：
package com.example.my.myapplication; import android.os.Bundle; import android.os.Handler; import android.os.Message; import android.support.v7.app.AppCompatActivity; import android.view.View; import android.widget.Button; import android.widget.TextView; import android.widget.Toast; import java.util.Random; public class Testduoxianchen extends AppCompatActivity { TextView tv_3,tv_4,tv_5,tv_6; Button bt_3,bt_4,bt_5; //定义Handler Handler h=new Handler(){ @Override public void handleMessage(Message msg) { super.handleMessage(msg); // 处理消息 if(msg.what==1) { String m=msg.obj.toString(); tv_5.setText(tv_5.getText()+" "+m); } else if (msg.what==2) { tv_5.setText(tv_5.getText()+"空消息"); } } }; int i=10; Handler hl=new Handler() { @Override public void handleMessage(Message msg) { super.handleMessage(msg); switch (msg.what) { case 1: if (i==20) { bt_5.setEnabled(false); return; } i++; tv_6.setText(i + ""); //发送 hl.sendEmptyMessageDelayed(1, 1000); hl.removeMessages(2); bt_3.setEnabled(false); bt_4.setEnabled(true); bt_5.setEnabled(true); break; case 2: if (i==1) { bt_5.setEnabled(false); return; } i--; tv_6.setText(i+""); hl.sendEmptyMessageDelayed(2,1000); bt_3.setEnabled(true); bt_4.setEnabled(false); bt_5.setEnabled(true); hl.removeMessages(1); break; case 3: hl.removeMessages(1); hl.removeMessages(2); bt_3.setEnabled(true); bt_4.setEnabled(true); bt_5.setEnabled(false); break; } } }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_testduoxianchen); tv_3=(TextView)findViewById(R.id.tv_3); tv_4=(TextView)findViewById(R.id.tv_4); tv_5=(TextView)findViewById(R.id.tv_5); tv_6=(TextView)findViewById(R.id.tv_6); bt_3=(Button)findViewById(R.id.bt_3); bt_4=(Button)findViewById(R.id.bt_4); bt_5=(Button)findViewById(R.id.bt_5); } //3个按钮 public void bt3_onClick(View v) { switch (v.getId()) { case R.id.bt_3: hl.sendEmptyMessage(1); break; case R.id.bt_4: hl.sendEmptyMessage(2); break; case R.id.bt_5: hl.sendEmptyMessage(3); break; } } public void bt2_onClick(View v) { //启动线程 new Thread(){ @Override public void run() { //发送消息 //1.创建消息 Message m=Message.obtain(); m.what=1;//id m.obj="新信息1"; //2.发送即时消息 h.sendMessage(m); m=Message.obtain(); m.what=1;//id m.obj="新信息2"; //发送延时消息 h.sendMessageDelayed(m,2000); h.sendEmptyMessage(2); h.sendEmptyMessageDelayed(2,3000); } }.start(); } String c1="北京"; String c2="青岛"; public void bt1_onClick(View v) { new Thread(){ @Override public void run() { for(int i=0;i<20;i++) { if(i%2==0) { c1=""; } else { c1="北京"; } runOnUiThread(new Runnable() { @Override public void run() { tv_3.setText(c1); } }); try { //暂停 时间随机 Thread.sleep(new Random().nextInt(1000)); } catch (Exception e) { } } runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(Testduoxianchen.this, c1 + "循环完成", Toast.LENGTH_SHORT).show(); } }); } }.start(); new Thread(){ @Override public void run() { for(int i=0;i<20;i++) { if(i%2==0) { c2=""; } else { c2="青岛"; } runOnUiThread(new Runnable() { @Override public void run() { tv_4.setText(c2); } }); try { //暂停 时间随机 Thread.sleep(new Random().nextInt(1000)); } catch (Exception e) { } } runOnUiThread(new Runnable() { @Override public void run() { Toast.makeText(Testduoxianchen.this, c2 + "循环完成", Toast.LENGTH_SHORT).show(); } }); } }.start(); } }
效果图：
