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最新推荐文章于 2022-08-12 20:54:49 发布

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最新推荐文章于 2022-08-12 20:54:49 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/qq_40072332/article/details/78312454

本文介绍了一个简单的Android应用程序设计，该程序在启动时显示倒计时并检查设备的网络连接状态。通过使用Handler和Thread实现了延迟跳转到下一个活动，并通过ConnectivityManager API检测了网络连接。

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//清单

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

//activitymain

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:background="@mipmap/ic_launcher"
    tools:context="com.example.yuelx.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginEnd="18dp"
        android:layout_marginRight="18dp"
        android:layout_marginTop="20dp"
        android:text="倒计时3秒"
        android:textColor="#ff00"
        android:textSize="20sp" />
</RelativeLayout>

//main2

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.yuelx.Main2Activity">

    <TextView
        android:layout_width="368dp"
        android:layout_height="495dp"
        android:gravity="center"
        android:text="第二页面" />
</RelativeLayout>

//mainactivity

package com.example.yuelx;

import android.content.Context;
import android.content.Intent;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        slp();
        checkMobileNet();
    }

    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            Intent intent = new Intent(MainActivity.this, Main2Activity.class);
            startActivity(intent);
        }
    };

    private void slp() {
        new Thread() {
            @Override
            public void run() {
                super.run();
                try {
                    sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
                handler.sendEmptyMessage(1);
            }
        }.start();
    }

    public void checkMobileNet() {
        // 1.检测手机是否处于联网状态
        // 1.得到系统服务ConnectivityManager
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        // 2.得到网络信息类对象
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();
        // 3.进行判断
        if (networkInfo != null && networkInfo.isConnected()) {
            Toast.makeText(this, "已连接互联网!", Toast.LENGTH_SHORT).show();
        } else {
            Toast.makeText(this, "未连接互联网!", Toast.LENGTH_SHORT).show();
        }
    }
}

//mainactivity2

package com.example.yuelx;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

public class Main2Activity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main2);
    }
}