多线程和消息机制

<?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"
    tools:context="com.hanqi.testapp2.TestActivity6"
    android:orientation="vertical">

    <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:text="启动"
        android:onClick="bt1_OnClick"/>

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="接收的消息"
        android:id="@+id/tv_5"/>

    <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:onClick="bt3_OnClick"
        android:id="@+id/bt_3"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="减少"
        android:onClick="bt3_OnClick"
        android:id="@+id/bt_4"/>

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="暂停"
        android:onClick="bt3_OnClick"
        android:id="@+id/bt_5"
        android:enabled="false"/>

</LinearLayout>

package com.hanqi.testapp2;

import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import java.util.Random;

public class TestActivity6 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:

                    bt_3.setEnabled(false);
                    bt_4.setEnabled(true);
                    bt_5.setEnabled(true);

                    if (i == 20)
                    {
                        bt_5.setEnabled(false);
                        return;
                    }

                    i++;

                    tv_6.setText(i + "");

                    //发送
                    hl.sendEmptyMessageDelayed(1, 1000);

                    hl.removeMessages(2);

                    break;

                case 2:

                    bt_3.setEnabled(true);
                    bt_4.setEnabled(false);
                    bt_5.setEnabled(true);

                    if (i == 1)
                    {
                        bt_5.setEnabled(false);
                        return;
                    }

                    i--;

                    tv_6.setText(i + "");

                    //发送
                    hl.sendEmptyMessageDelayed(2,1000);

                    hl.removeMessages(1);

                    break;

                case 3:

                    bt_3.setEnabled(true);
                    bt_4.setEnabled(true);
                    bt_5.setEnabled(false);

                    hl.removeMessages(1);
                    hl.removeMessages(2);

                    break;
            }
        }
    };

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test6);

        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:

                //发送增加消息
                hl.sendEmptyMessage(1);

                break;

            case R.id.bt_4:

                //发送减少消息
                hl.sendEmptyMessage(2);

                break;

            case R.id.bt_5:

                //发送暂停消息
                hl.sendEmptyMessage(3);

                break;
        }
    }


    //发消息
    public void bt2_OnClick(View v)
    {
        //启动线程
        new Thread(){
            @Override
            public void run() {

                //发送消息
                //1、创建Message
                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();
    }


    public void bt1_OnClick(View v)
    {
        tv_3.setText("");
        tv_4.setText("");

        //创建子线程1
        new Thread(){
            @Override
            public void run() {

                for (int i = 0; i<10; i++) {
                    try {
                        //暂停时间随机
                        Thread.sleep(new Random().nextInt(2000));
                    }
                    catch (Exception e)
                    {

                    }

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                          tv_3.setText(tv_3.getText() + "北京");
                        }
                    });

                }

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(TestActivity6.this, "北京 循环完成", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }.start();



        //创建子线程2
        new Thread(){
            @Override
            public void run() {

                for (int i = 0; i<10; i++) {
                    try {
                        //暂停时间随机
                        Thread.sleep(new Random().nextInt(2000));
                    }
                    catch (Exception e)
                    {

                    }

                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {

                            tv_4.setText(tv_4.getText() + "香港");
                        }
                    });

                }

                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(TestActivity6.this, "香港 循环完成", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }.start();
    }
}