Android 检查是否有网络

public static boolean isConnect(Context context) { // 获取手机所有连接管理对象（包括对wi-fi,net等连接的管理） try { ConnectivityManager connectivity = (ConnectivityManager) context .getSystemService(Context.CONNECTIVITY_SERVICE); if (connectivity != null) { // 获取网络连接管理的对象 NetworkInfo info = connectivity.getActiveNetworkInfo(); if (info != null&& info.isConnected()) { // 判断当前网络是否已经连接 if (info.getState() == NetworkInfo.State.CONNECTED) { return true; } } } } catch (Exception e) { // TODO: handle exception Log.v("error",e.toString()); } return false; } 最后一点还得再manifest中添加权限 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/> 网络没信号的时候，直接跳转到网络设置界面

Setting的源代码是在AndroidManifest.xml中设置的

写在<application>标签里，如下：

[html] view plain copy

<PreferenceScreen
android:title="@string/radio_controls_title"
android:summary="@string/radio_controls_summary">
<intent
android:action="android.intent.action.MAIN"
android:targetPackage="com.android.settings"
android:targetClass="com.android.settings.WirelessSettings"/>
</PreferenceScreen>

然后在对应的Activity中写如下的java代码：

[java] view plain copy

IntentwifiSettingsIntent=newIntent("android.settings.WIFI_SETTINGS");
startActivity(wifiSettingsIntent);

封装的调用

public static void showNetErrorDialog(final Context ctx) {AlertDialog.Builder builder = new AlertDialog.Builder(ctx).setMessage("没有网络，前去打通？").setIcon(R.drawable.ic_launcher).setCancelable(true);builder.setPositiveButton("前往", new OnClickListener() {@Overridepublic void onClick(DialogInterface dialog, int which) {Intent wifiSettingsIntent = new Intent("android.settings.WIFI_SETTINGS");ctx.startActivity(wifiSettingsIntent);}});builder.setNegativeButton("拉倒", null);builder.create().show();}

if (appContext.isNetworkConnected(getActivity())) {LoadJournalAsyncTask loadJournal = new LoadJournalAsyncTask();loadJournal.execute(0, null);} else {DialogUtil.showNetErrorDialog(getActivity());}

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