Android连接网络问题

一、检查网络是否连接

方法一、

public void CheckNetworkState() {
boolean flag = false;
ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
State mobile = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE)
.getState();
State wifi = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI)
.getState();
// 如果3G、wifi、2G等网络状态是连接的，则退出，否则显示提示信息进入网络设置界面
if (mobile == State.CONNECTED || mobile == State.CONNECTING)
return;
if (wifi == State.CONNECTED || wifi == State.CONNECTING)
return;

//如果不可用,弹出对话框

}

方法二：

publicclassConnectionDetector {

08

`09`	`privateContext _context;`

10

`11`	`publicConnectionDetector(Context context){`

`12`	`this._context = context;`

13 }

14

`15`	`publicbooleanisConnectingToInternet(){`

`16`	`ConnectivityManager connectivity = (ConnectivityManager) _context.getSystemService(Context.CONNECTIVITY_SERVICE);`

`17`	`if(connectivity !=null)`

18 {

`19`	`NetworkInfo[] info = connectivity.getAllNetworkInfo();`

`20`	`if(info !=null)`

`21`	`for(inti =0; i < info.length; i++)`

`22`	`if(info[i].getState() == NetworkInfo.State.CONNECTED)`

23 {

`24`	`returntrue;`

25 }

26

27 }

`28`	`returnfalse;`

29 }

30 }

方法三、

1. 首先先看一下Android判断网络是否已打开(如果直接写在Activity里面,则可以不需要参数)
                     /*     * 判断网络连接是否已开     * 2012-08-20     *true 已打开  false 未打开     * */    public static boolean isConn(Context context){        boolean bisConnFlag=false;        ConnectivityManager conManager = (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);        NetworkInfo network = conManager.getActiveNetworkInfo();        if(network!=null){            bisConnFlag=conManager.getActiveNetworkInfo().isAvailable();        }        return bisConnFlag;    }
             
2.如果未开启网络调用打开设置界面(如果不写在Activity里面则不需要参数)
                     /*     * 打开设置网络界面     * */    public static void setNetworkMethod(final Context context){        //提示对话框        AlertDialog.Builder builder=new Builder(context);        builder.setTitle("网络设置提示").setMessage("网络连接不可用,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;                //判断手机系统的版本  即API大于10 就是3.0或以上版本                 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();    }
             3. 在 AndroidManifest.xml中设置权限
          <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>    <uses-permission android:name="android.permission.INTERNET"/>
  4. 在相应的位置调用即可
      if(!ConnectionUtil.isConn(getApplicationContext())){            ConnectionUtil.setNetworkMethod(MainActivity.this);        }

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