在项目中，经常需要判断是否有网络连接。最近学习了如何判断软件是否联网，如果没有联网，弹出提示信息，连接网络。

效果：

（1）联网情况下：

（2）不联网情况下:

（3）点击“检测设置”:

源码下载：http://xiazai.jb51.net/201605/yuanma/MyApplication(jb51.net).rar

判断我们的软件是否联网，看代码吧：

  /**
   * 检测网络连接
   *
   * @param con
   * @return
   */
  public boolean isNetworkAvailable(Context con) {
    ConnectivityManager cm = (ConnectivityManager) con
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (cm == null)
      return false;
    NetworkInfo netinfo = cm.getActiveNetworkInfo();
    if (netinfo == null) {
      return false;
    }
    if (netinfo.isConnected()) {
      return true;
    }
    return false;
  }

如果没有联网，弹出提示框，提示设置网络连接：

  /**
   * 提示设置网络连接对话框
   *
   * @param context
   */
  public void showNetDialog(final Context context) {
    mMaterialDialog = new MaterialDialog(context)
    .setMessage("世界上最遥远的距离就是没网")
    .setPositiveButton("检查设置", new View.OnClickListener() {

      @Override
      public void onClick(View v) {

        Intent intent = null;
        try {
        @SuppressWarnings("deprecation")
        String sdkVersion = android.os.Build.VERSION.SDK;
        if (Integer.valueOf(sdkVersion) > 10) {
           intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
        } else {
           intent = new Intent();
           ComponentName comp = new  ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
           intent.setComponent(comp);
           intent.setAction("android.intent.action.VIEW");
        }
           context.startActivity(intent);
        } catch (Exception e) {
           e.printStackTrace();
        }
           mMaterialDialog.dismiss();

      }
      }).setNegativeButton("取消", new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           mMaterialDialog.dismiss();
      }
    });

    mMaterialDialog.show();
  }

怎么做判断处理：

  /**
   * 判断是否联网
   */
  private void checkNet() {
    if(!mCheckNetWork.isNetworkAvailable(getApplication())){
      mCheckNetWork.showNetDialog(MainActivity.this);
    }else {
      Toast.makeText(MainActivity.this,
      "有网络，哈哈",Toast.LENGTH_SHORT).show();
    }
  }

具体代码如下：

MainActivity.java

package com.bzu.gxs.chectnetwork;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

public class MainActivity extends Activity implements View.OnClickListener{
  private CheckNetWork mCheckNetWork =new CheckNetWork();
  private Button btn_check;

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

  /**
   * 点击事件
   *
   * @param view
   */
  @Override
  public void onClick(View view) {
    switch (view.getId()){
      case R.id.btn_check:
        checkNet();
    }
  }

  /**
   * 判断是否联网
   */
  private void checkNet() {
    if(!mCheckNetWork.isNetworkAvailable(getApplication())){
      mCheckNetWork.showNetDialog(MainActivity.this);
    }else {
      Toast.makeText(MainActivity.this,
      "有网络，哈哈",Toast.LENGTH_SHORT).show();
    }
  }

  /**
   * 初始化
   */
  private void init() {
    btn_check = (Button) findViewById(R.id.btn_check);
    btn_check.setOnClickListener(this);
  }
}

CheckNetWork.java

package com.bzu.gxs.chectnetwork;

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.media.browse.MediaBrowser;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Build;
import android.view.View;

import me.drakeet.materialdialog.MaterialDialog;

/**
 * 网络检测
 * Created by GXS on 2016/5/13.
 */
public class CheckNetWork {

  private MaterialDialog mMaterialDialog;

  /**
   * 检测网络连接
   *
   * @param con
   * @return
   */
  public boolean isNetworkAvailable(Context con) {
    ConnectivityManager cm = (ConnectivityManager) con
        .getSystemService(Context.CONNECTIVITY_SERVICE);
    if (cm == null)
      return false;
    NetworkInfo netinfo = cm.getActiveNetworkInfo();
    if (netinfo == null) {
      return false;
    }
    if (netinfo.isConnected()) {
      return true;
    }
    return false;
  }

  /**
   * 提示设置网络连接对话框
   *
   * @param context
   */
  public void showNetDialog(final Context context) {
    mMaterialDialog = new MaterialDialog(context)
    .setMessage("世界上最遥远的距离就是没网")
    .setPositiveButton("检查设置", new View.OnClickListener() {

      @Override
      public void onClick(View v) {

        Intent intent = null;
        try {
        @SuppressWarnings("deprecation")
        String sdkVersion = android.os.Build.VERSION.SDK;
        if (Integer.valueOf(sdkVersion) > 10) {
           intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
        } else {
           intent = new Intent();
           ComponentName comp = new
               ComponentName("com.android.settings",
               "com.android.settings.WirelessSettings");
           intent.setComponent(comp);
           intent.setAction("android.intent.action.VIEW");
        }
           context.startActivity(intent);
        } catch (Exception e) {
           e.printStackTrace();
        }
           mMaterialDialog.dismiss();

      }
      }).setNegativeButton("取消", new View.OnClickListener() {
        @Override
        public void onClick(View v) {
           mMaterialDialog.dismiss();
      }
    });

    mMaterialDialog.show();
  }
}

activity_main.xml

<?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: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.bzu.gxs.chectnetwork.MainActivity">

  <Button
    android:id="@+id/btn_check"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="测试"/>
</RelativeLayout>

注意：需要在清单文件AndroidManifest.xml中加入

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

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。