***** **網絡判斷** [TOC=6] # 1. 網絡連接的判斷（重點） 注意：必須添加網絡狀態的權限 ~~~ <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" /> ~~~ 判斷網絡 ~~~ /** * 判斷網絡是否可用 */ public boolean isNetworkConnected(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); if (mNetworkInfo != null) { return mNetworkInfo.isAvailable(); } } return false; } ~~~ # 2. 判斷網絡類型 ` ~~~ /** * 判斷網絡類型 */ public static int getConnectedType(Context context) { if (context != null) { ConnectivityManager mConnectivityManager = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); NetworkInfo mNetworkInfo = mConnectivityManager.getActiveNetworkInfo(); if (mNetworkInfo != null && mNetworkInfo.isAvailable()) { return mNetworkInfo.getType(); } } return -1; } ~~~ ` # 3. 沒有網絡，提示用戶（跳轉） 全部網絡設置(ACTION_WIRELESS_SETTINGS);? WIFI設置(ACTION_WIFI_SETTINGS);? 3G流量設置: (ACTION_DATA_ROAMING_SETTINGS). ` ~~~ /** * 當判斷當前手機沒有網絡時選擇是否打開網絡設置 * @param context */ public static void showNoNetWorkDlg(final Context context) { AlertDialog.Builder builder = new Builder(context); builder.setIcon(R.drawable.ic_launcher) .setTitle(R.string.app_name) .setMessage("當前無網絡").setPositiveButton("設置", new OnClickListener() { @Override public void onClick(DialogInterface dialog, int which) { // 跳轉到系統的網絡設置界面 Intent intent = new Intent(android.provider.Settings.ACTION_WIRELESS_SETTINGS); context.startActivity(intent); } }).setNegativeButton("知道了", null).show(); } ~~~ `