[英]Internet Connectivity check in Android
我需要檢查Android中是否有互聯網,所以我嘗試使用以下功能:
boolean b_IsConnect = isNetworkAvailable();
private boolean isNetworkAvailable() {
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
return activeNetworkInfo != null;
}
我還在清單中添加了所需的權限:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
但它仍然拋出異常:
05-02 16:05:26.226: E/AndroidRuntime(481): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.housedisplay/com.housedisplay.RssActivity}: java.lang.SecurityException: ConnectivityService: Neither user 10038 nor current process has android.permission.ACCESS_NETWORK_STATE.
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1736)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1752)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread.access$1500(ActivityThread.java:123)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:993)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.os.Handler.dispatchMessage(Handler.java:99)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.os.Looper.loop(Looper.java:126)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread.main(ActivityThread.java:3997)
05-02 16:05:26.226: E/AndroidRuntime(481): at java.lang.reflect.Method.invokeNative(Native Method)
05-02 16:05:26.226: E/AndroidRuntime(481): at java.lang.reflect.Method.invoke(Method.java:491)
05-02 16:05:26.226: E/AndroidRuntime(481): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)
05-02 16:05:26.226: E/AndroidRuntime(481): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)
05-02 16:05:26.226: E/AndroidRuntime(481): at dalvik.system.NativeStart.main(Native Method)
05-02 16:05:26.226: E/AndroidRuntime(481): Caused by: java.lang.SecurityException: ConnectivityService: Neither user 10038 nor current process has android.permission.ACCESS_NETWORK_STATE.
05-02 16:05:26.226: E/AndroidRuntime(481): at android.os.Parcel.readException(Parcel.java:1322)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.os.Parcel.readException(Parcel.java:1276)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.net.IConnectivityManager$Stub$Proxy.getActiveNetworkInfo(IConnectivityManager.java:446)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.net.ConnectivityManager.getActiveNetworkInfo(ConnectivityManager.java:256)
05-02 16:05:26.226: E/AndroidRuntime(481): at com.housedisplay.RssActivity.isNetworkAvailable(RssActivity.java:218)
05-02 16:05:26.226: E/AndroidRuntime(481): at com.housedisplay.RssActivity.onCreate(RssActivity.java:59)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1048)
05-02 16:05:26.226: E/AndroidRuntime(481): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1700)
你能告訴我這里發生了什么嗎?
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" >
缺少結束斜杠。 可能導致解析XML的問題,這可能導致下一個<uses-permission ...>
無法正確解析。
您需要在Manifest.xml中設置application-tag之外的權限
這樣它應該工作:
private boolean connectionChecker() {
// ConnectivityManager casten
connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
// boolean für networkinfo holen
activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
// Returnt true oder false if not null
return activeNetworkInfo != null;
}
試試這樣,
private void checkNetworkState() {
// TODO Auto-generated method stub
ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connectivityManager
.getActiveNetworkInfo();
if (activeNetworkInfo == null) {
Toast.makeText(this, "Network Not Connected...Please Try Again",
Toast.LENGTH_LONG).show();
} else {
if (activeNetworkInfo.isConnected()) {
try {
<< Your Task>>>
} catch (Exception e) {
// TODO Auto-generated catch block
System.out.println("Inside the Exception" + e.getMessage());
}
} else if (activeNetworkInfo.isConnectedOrConnecting()) {
Toast.makeText(this,
"Network is connecting Now please patient",
Toast.LENGTH_LONG).show();
}
}
}
在manifest <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
添加此權限(在應用程序標記上方放置權限標記)
試試這個代碼
public boolean isNetworkOnline() {
boolean status=false;
try{
ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getNetworkInfo(0);
if (netInfo != null && netInfo.getState()==NetworkInfo.State.CONNECTED) {
status= true;
}else {
netInfo = cm.getNetworkInfo(1);
if(netInfo!=null && netInfo.getState()==NetworkInfo.State.CONNECTED)
status= true;
}
}catch(Exception e){
e.printStackTrace();
return false;
}
return status;
}
NetworkInfo i = conMgr.getActiveNetworkInfo(); if (i == null)
return false; if (!i.isConnected())
return false; if (!i.isAvailable())
return false; return true;
您只需將權限置於Andriod Manifesto上的應用程序標記之上
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