我想创建一个使用互联网的应用程序，我试图创建一个功能，检查连接是否可用，如果它不是，去到一个活动，有一个重试按钮和解释。
附件是我的代码到目前为止，但我得到的错误语法错误，插入“}”来完成MethodBody。
现在我已经把这些放在试图让它工作，但到目前为止没有运气…任何帮助都将不胜感激。
public class TheEvoStikLeagueActivity extends Activity {
private final int SPLASH_DISPLAY_LENGHT = 3000;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
setContentView(R.layout.main);
private boolean checkInternetConnection() {
ConnectivityManager conMgr = (ConnectivityManager) getSystemService (Context.CONNECTIVITY_SERVICE);
// ARE WE CONNECTED TO THE NET
if (conMgr.getActiveNetworkInfo() != null
&& conMgr.getActiveNetworkInfo().isAvailable()
&& conMgr.getActiveNetworkInfo().isConnected()) {
return true;
/* New Handler to start the Menu-Activity
* and close this Splash-Screen after some seconds.*/
new Handler().postDelayed(new Runnable() {
public void run() {
/* Create an Intent that will start the Menu-Activity. */
Intent mainIntent = new Intent(TheEvoStikLeagueActivity.this, IntroActivity.class);
TheEvoStikLeagueActivity.this.startActivity(mainIntent);
TheEvoStikLeagueActivity.this.finish();
}
}, SPLASH_DISPLAY_LENGHT);
} else {
return false;
Intent connectionIntent = new Intent(TheEvoStikLeagueActivity.this, HomeActivity.class);
TheEvoStikLeagueActivity.this.startActivity(connectionIntent);
TheEvoStikLeagueActivity.this.finish();
}
}
}
检查以确保它“连接”到网络:
public boolean isNetworkAvailable(Context context) {
ConnectivityManager connectivityManager = ((ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE));
return connectivityManager.getActiveNetworkInfo() != null && connectivityManager.getActiveNetworkInfo().isConnected();
}
检查以确保它“连接”到互联网:
public boolean isInternetAvailable() {
try {
InetAddress address = InetAddress.getByName("www.google.com");
return !address.equals("");
} catch (UnknownHostException e) {
// Log error
}
return false;
}
需要许可:
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
https://stackoverflow.com/a/17583324/950427
检查网络可用在android与互联网数据速度。
public boolean isConnectingToInternet(){
ConnectivityManager connectivity = (ConnectivityManager) Login_Page.this.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity != null)
{
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null)
for (int i = 0; i < info.length; i++)
if (info[i].getState() == NetworkInfo.State.CONNECTED)
{
try
{
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(500); //choose your own timeframe
urlc.setReadTimeout(500); //choose your own timeframe
urlc.connect();
int networkcode2 = urlc.getResponseCode();
return (urlc.getResponseCode() == 200);
} catch (IOException e)
{
return (false); //connectivity exists, but no internet.
}
}
}
return false;
}
此函数返回true或false。
必须获得用户权限
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
这个方法检查手机是否连接到互联网，如果连接则返回true:
private boolean isNetworkConnected() {
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
return cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected();
}
在清单,
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
编辑:
这个方法实际上是检查设备是否连接到互联网(有可能它连接到网络但没有连接到互联网)。
public boolean isInternetAvailable() {
try {
InetAddress ipAddr = InetAddress.getByName("google.com");
//You can replace it with your name
return !ipAddr.equals("");
} catch (Exception e) {
return false;
}
}
