在項目中，經常需要判斷是否有網絡連接。最近學習了如何判斷軟件是否聯網，如果沒有聯網，彈出提示信息，連接網絡。
效果：
（1）聯網情況下：
（2）不聯網情況下:
（3）點擊“檢測設置”:
源碼下載：http://xiazai.VeVB.COm/201605/yuanma/MyApplication(VeVB.COm).rar
判斷我們的軟件是否聯網，看代碼吧：
/** * 檢測網絡連接 * * @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; }如果沒有聯網，彈出提示框，提示設置網絡連接：
/** * 提示設置網絡連接對話框 * * @param context */ public void showNetDialog(final Context context) { mMaterialDialog = new MaterialDialog(context) .setMessage("世界上最遙遠的距離就是沒網") .setPositiveButton("檢查設置", 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(); }怎么做判斷處理：
/** * 判斷是否聯網 */ private void checkNet() { if(!mCheckNetWork.isNetworkAvailable(getApplication())){ mCheckNetWork.showNetDialog(MainActivity.this); }else { Toast.makeText(MainActivity.this, "有網絡，哈哈",Toast.LENGTH_SHORT).show(); } }具體代碼如下：
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(); } /** * 點擊事件 * * @param view */ @Override public void onClick(View view) { switch (view.getId()){ case R.id.btn_check: checkNet(); } } /** * 判斷是否聯網 */ private void checkNet() { if(!mCheckNetWork.isNetworkAvailable(getApplication())){ mCheckNetWork.showNetDialog(MainActivity.this); }else { Toast.makeText(MainActivity.this, "有網絡，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;/** * 網絡檢測 * Created by GXS on 2016/5/13. */public class CheckNetWork { private MaterialDialog mMaterialDialog; /** * 檢測網絡連接 * * @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; } /** * 提示設置網絡連接對話框 * * @param context */ public void showNetDialog(final Context context) { mMaterialDialog = new MaterialDialog(context) .setMessage("世界上最遙遠的距離就是沒網") .setPositiveButton("檢查設置", 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="測試"/></RelativeLayout>
注意：需要在清單文件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內容，希望對大家的學習有所幫助，也希望大家多多支持武林網。
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