从主 activity 检查互联网状态
Check internet status from the main activity
我是android开发的新生,所以我没有足够的编码经验,所以我需要你的帮助...
我在 android 工作室创建了一个 java class 来检查是否有互联网连接:
import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
public class InternetStatus {
private static final String LOG_TAG ="InternetStatus";
public static boolean hasActiveInternetConnection(Context context) {
if (isNetworkAvailable((Activity) context)) {
try {
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
Log.e(LOG_TAG, "Error checking internet connection", e);
}
} else {
Log.d(LOG_TAG, "No network available!");
}
return false;
}
public static boolean isNetworkAvailable(Activity mActivity) {
Context context = mActivity.getApplicationContext();
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
}
那么,我有两个问题:
1- 这是正确的代码还是我遗漏了什么?
2- 如您所见,这是一个 java class,如果我在主 activity 上创建一个按钮来检查是否有互联网连接!!我如何通过导入这个 class 或类似的东西来做到这一点?!!
在你的MainActivity
class
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_camera);
boolean isavailable = InternetStatus.hasActiveInternetConnection(getApplicationContext);
}
}
如果你有按钮
boolean isavailable ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_camera);
Button someButton = (Button) findViewById(R.id.yourButton);
someButton.setOnClickListener(new onClickLIstener(){
isavailable = InternetStatus.hasActiveInternetConnection(getApplicationContext);
});
}
}
查看连接状态无需连接到互联网并获取状态代码。使用下面的代码。
public boolean isConnected() {
ConnectivityManager manager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if (info != null && info.isConnected()) {
return true;
} else {
return false;
}
}
哪个 return 是基于活跃的网络状态。
在您的按钮上单击只需调用此函数,如果它 return 为真,则存在连接。如果它 return 为假,则没有活动的互联网连接。
只需将 info.isConnected() 放入您的 isNetworkAvailable 函数中:
public static boolean isNetworkAvailable(Activity mActivity) {
...
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null && info.isConnected()) {
...
}
}
}
return false;
}
// Check if there is any connectivity for a Wifi network
public boolean isConnectedWifi(){
NetworkInfo info = Connectivity.getNetworkInfo(Context);
return info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI;
}
// Check if there is any connectivity for a mobile network
public boolean isConnectedMobile(){
NetworkInfo info = Connectivity.getNetworkInfo(Context);
return info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE;
}
// Check all connectivities whether available or not
public boolean isNetworkAvailable() {
ConnectivityManager cm = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
return networkInfo != null && networkInfo.isConnected();
}
如何使用?
例如,我们需要检查连接是否可用:
if(isNetworkAvailable()){
// do your thing here.
}
当网络可用时,我们需要检查是WiFi还是移动网络:
if(isConnectedWifi()){
// do your thing here with WiFi Network.
}
if(isConnectedMobile()){
// do your thing here with Mobile Network.
}
首先,您必须在AndroidManifest.xml
中包含一个权限请求
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
然后,创建一个方法来检查互联网连接是否有效:
public static boolean isInternetConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
}
大部分答案已过时
fun isNetworkAvailable(context : Context): Boolean {
val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
if (isAndroidVersionAboveLollipop()) {
val activeNetwork = connectivityManager.activeNetwork ?: return false
val networkCapabilities = connectivityManager.getNetworkCapabilities(activeNetwork) ?: return false
networkCapabilities.let {
return it.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) && it.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)
}
} else {
return connectivityManager.activeNetworkInfo?.isConnectedOrConnecting ?: false
}
}
fun isAndroidVersionAboveLollipop() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M
我是android开发的新生,所以我没有足够的编码经验,所以我需要你的帮助... 我在 android 工作室创建了一个 java class 来检查是否有互联网连接:
import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.util.Log;
import java.io.IOException;
import java.net.HttpURLConnection;
import java.net.URL;
public class InternetStatus {
private static final String LOG_TAG ="InternetStatus";
public static boolean hasActiveInternetConnection(Context context) {
if (isNetworkAvailable((Activity) context)) {
try {
HttpURLConnection urlc = (HttpURLConnection) (new URL("http://www.google.com").openConnection());
urlc.setRequestProperty("User-Agent", "Test");
urlc.setRequestProperty("Connection", "close");
urlc.setConnectTimeout(1500);
urlc.connect();
return (urlc.getResponseCode() == 200);
} catch (IOException e) {
Log.e(LOG_TAG, "Error checking internet connection", e);
}
} else {
Log.d(LOG_TAG, "No network available!");
}
return false;
}
public static boolean isNetworkAvailable(Activity mActivity) {
Context context = mActivity.getApplicationContext();
ConnectivityManager connectivity = (ConnectivityManager) context
.getSystemService(Context.CONNECTIVITY_SERVICE);
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null) {
for (int i = 0; i < info.length; i++) {
if (info[i].getState() == NetworkInfo.State.CONNECTED) {
return true;
}
}
}
}
return false;
}
}
那么,我有两个问题:
1- 这是正确的代码还是我遗漏了什么?
2- 如您所见,这是一个 java class,如果我在主 activity 上创建一个按钮来检查是否有互联网连接!!我如何通过导入这个 class 或类似的东西来做到这一点?!!
在你的MainActivity
class
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_camera);
boolean isavailable = InternetStatus.hasActiveInternetConnection(getApplicationContext);
}
}
如果你有按钮
boolean isavailable ;
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_camera);
Button someButton = (Button) findViewById(R.id.yourButton);
someButton.setOnClickListener(new onClickLIstener(){
isavailable = InternetStatus.hasActiveInternetConnection(getApplicationContext);
});
}
}
查看连接状态无需连接到互联网并获取状态代码。使用下面的代码。
public boolean isConnected() {
ConnectivityManager manager = (ConnectivityManager)getSystemService(CONNECTIVITY_SERVICE);
NetworkInfo info = manager.getActiveNetworkInfo();
if (info != null && info.isConnected()) {
return true;
} else {
return false;
}
}
哪个 return 是基于活跃的网络状态。
在您的按钮上单击只需调用此函数,如果它 return 为真,则存在连接。如果它 return 为假,则没有活动的互联网连接。
只需将 info.isConnected() 放入您的 isNetworkAvailable 函数中:
public static boolean isNetworkAvailable(Activity mActivity) {
...
if (connectivity == null) {
return false;
} else {
NetworkInfo[] info = connectivity.getAllNetworkInfo();
if (info != null && info.isConnected()) {
...
}
}
}
return false;
}
// Check if there is any connectivity for a Wifi network
public boolean isConnectedWifi(){
NetworkInfo info = Connectivity.getNetworkInfo(Context);
return info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_WIFI;
}
// Check if there is any connectivity for a mobile network
public boolean isConnectedMobile(){
NetworkInfo info = Connectivity.getNetworkInfo(Context);
return info != null && info.isConnected() && info.getType() == ConnectivityManager.TYPE_MOBILE;
}
// Check all connectivities whether available or not
public boolean isNetworkAvailable() {
ConnectivityManager cm = (ConnectivityManager)
getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = cm.getActiveNetworkInfo();
return networkInfo != null && networkInfo.isConnected();
}
如何使用?
例如,我们需要检查连接是否可用:
if(isNetworkAvailable()){
// do your thing here.
}
当网络可用时,我们需要检查是WiFi还是移动网络:
if(isConnectedWifi()){
// do your thing here with WiFi Network.
}
if(isConnectedMobile()){
// do your thing here with Mobile Network.
}
首先,您必须在AndroidManifest.xml
中包含一个权限请求<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
然后,创建一个方法来检查互联网连接是否有效:
public static boolean isInternetConnected(Context context) {
ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null && activeNetwork.isConnectedOrConnecting();
}
大部分答案已过时
fun isNetworkAvailable(context : Context): Boolean {
val connectivityManager = context.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
if (isAndroidVersionAboveLollipop()) {
val activeNetwork = connectivityManager.activeNetwork ?: return false
val networkCapabilities = connectivityManager.getNetworkCapabilities(activeNetwork) ?: return false
networkCapabilities.let {
return it.hasCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET) && it.hasCapability(NetworkCapabilities.NET_CAPABILITY_VALIDATED)
}
} else {
return connectivityManager.activeNetworkInfo?.isConnectedOrConnecting ?: false
}
}
fun isAndroidVersionAboveLollipop() = Build.VERSION.SDK_INT >= Build.VERSION_CODES.M