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" />
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
当您连接到Wi-Fi源或通过手机数据包时，上述方法都有效。但在Wi-Fi连接的情况下，有时你会被进一步要求登录，就像在咖啡馆一样。所以在这种情况下，你的应用程序将失败，因为你连接的是Wi-Fi源，而不是互联网。
这个方法很有效。
public static boolean isConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager)context
.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
if (activeNetwork != null && activeNetwork.isConnected()) {
try {
URL url = new URL("http://www.google.com/");
HttpURLConnection urlc = (HttpURLConnection)url.openConnection();
urlc.setRequestProperty("User-Agent", "test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1000); // mTimeout is in seconds
urlc.connect();
if (urlc.getResponseCode() == 200) {
return true;
} else {
return false;
}
} catch (IOException e) {
Log.i("warning", "Error checking internet connection", e);
return false;
}
}
return false;
}
请在与主线程分开的线程中使用此线程，因为它会进行网络调用，如果不遵循将抛出networkkonmainthreadexception。
也不要把这个方法放在onCreate或任何其他方法中。把它放到一个类中并访问它。
1-创建新的Java文件(右键单击包。新建>类>，命名为文件ConnectionDetector.java
2-在文件中添加以下代码
package <add you package name> example com.example.example;
import android.content.Context;
import android.net.ConnectivityManager;
public class ConnectionDetector {
private Context mContext;
public ConnectionDetector(Context context){
this.mContext = context;
}
public boolean isConnectingToInternet(){
ConnectivityManager cm = (ConnectivityManager)mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
if(cm.getActiveNetworkInfo() != null && cm.getActiveNetworkInfo().isConnected() == true)
{
return true;
}
return false;
}
}
3-打开MainActivity.java -要检查连接的活动，并执行以下操作
创建并定义函数。
ConnectionDetector mConnectionDetector;</pre>
在“OnCreate”中添加以下内容
mConnectionDetector = new ConnectionDetector(getApplicationContext());
C -检查连接使用以下步骤
if (mConnectionDetector.isConnectingToInternet() == false) {
//no connection- do something
} else {
//there is connection
}
