如何判断软件程序是否联网 联网状态提示信息Android实现

  /**   * 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();  }

  /**   * 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();    }  }

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);  }}

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();  }}

<?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>

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