Android判断网络状态的代码

本文实例为大家分享了Android判断网络状态的具体代码，供大家参考，具体内容如下

一、权限

需要在AndroidManifest.xml 添加访问权限

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

二、判断连接状态

/**
 * 判断是否有网络连接
 * @param context
 * @return
 */
public static boolean isConnect(Context context) {
 boolean _isConnect = false;
 ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);
 NetworkInfo network = conManager.getActiveNetworkInfo();
 if (network != null) {
  _isConnect = conManager.getActiveNetworkInfo().isAvailable();
 }
 return _isConnect;
}

三、打开网络设置对话框

/**
 * 打开系统网络设置界面
 * @param context
 */
public void setNetworkMethod(final Context context) {

AlertDialog.Builder builder = new AlertDialog.Builder(context);
 builder.setTitle("提示信息").setMessage("未发现网络连接,是否进行设置?").setPositiveButton("设置", new DialogInterface.OnClickListener() {
  @Override
  public void onClick(DialogInterface dialog, int which) {
   // TODO Auto-generated method stub
   Intent intent = null;
   //3.0之前和之后API不同，需要判断
   if (android.os.Build.VERSION.SDK_INT > 10) {
    intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS);
   } else {
    intent = new Intent();
    ComponentName component = new ComponentName("com.android.settings", "com.android.settings.WirelessSettings");
    intent.setComponent(component);
    intent.setAction("android.intent.action.VIEW");
   }
   context.startActivity(intent);
  }
 }).setNegativeButton("取消", new DialogInterface.OnClickListener() {

@Override
  public void onClick(DialogInterface dialog, int which) {
   // TODO Auto-generated method stub
   dialog.dismiss();
  }
 }).show();
}

四、调用

button.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
   if (!isConnect(TwoActivity.this)){
    setNetworkMethod(TwoActivity.this);
   }
  }
 });

来源：http://blog.csdn.net/u013190012/article/details/78192516