5月16日课程总结

1.AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.administrator.testapp">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity"></activity>
        <activity android:name=".test_activity6">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

2.Activity_test_activity6.xml

【城市选择程序 界面代码】

<?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"
    tools:context="com.example.administrator.testapp.test_activity6"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="城市一"
        android:textSize="30dp"
        android:id="@+id/tv_3"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="城市二"
        android:textSize="30dp"
        android:id="@+id/tv_4"/>

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="城市三"
        android:textSize="30dp"
        android:id="@+id/tv_5"/>
    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="启动"
        android:onClick="bt1_onclick"/>
<LinearLayout/>

 【城市选择运行代码】

package com.example.administrator.testapp;

import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.os.Handler;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import java.util.Random;
import java.util.logging.LogRecord;

public class test_activity6 extends AppCompatActivity {

    TextView tv_3,tv_4,tv_5,tv_6;

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test_activity6);
        tv_3 = (TextView) findViewById(R.id.tv_3);
        tv_4 = (TextView) findViewById(R.id.tv_4);
        tv_5 = (TextView) findViewById(R.id.tv_5);

    String c1 = "北京";
    String c2 = "香港";
    String c3 = "重庆";

    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
                    {
                        Thread.sleep((int)(Math.random()*1000));
                    }
                    catch (Exception e)
                    {

                    }
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(test_activity6.this, c1+"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<20;i++)
                {
                    if (i%2==0)
                    {
                        c2="";
                    }
                    else
                    {
                        c2="香港";
                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            tv_4.setText(c2);
                        }
                    });
                    try
                    {
                        Thread.sleep((int)(Math.random()*1000));
                    }
                    catch (Exception e)
                    {

                    }
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(test_activity6.this, c2+"循环完成", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }.start();
        //创建子线程
        new Thread()
        {
            @Override
            public void run() {
                for (int i=0;i<20;i++)
                {
                    if (i%2==0)
                    {
                        c3="";
                    }
                    else
                    {
                        c3="重庆";
                    }
                    runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            tv_5.setText(c3);
                        }
                    });
                    try
                    {
                        Thread.sleep((int)(Math.random()*1000));
                    }
                    catch (Exception e)
                    {

                    }
                }
                runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(test_activity6.this, c3+"循环完成", Toast.LENGTH_SHORT).show();
                    }
                });
            }
        }.start();
    }
}