[英]How to detect Network change and change activity from A to B when Network is connected
我有 SplashActivity、Activity A 和 Activity B。
當 Internet 不可用時,Splash Activity 重定向到 Activity A,當 Internet 可用且已連接時,SplashActivity 重定向到 Activity B。
我想在用戶自己連接時立即關閉活動 A,並在用戶仍在應用程序內並打開他的 wifi 或移動數據時打開活動 B。
這是我在 SplahsActivity 中使用的代碼,用於根據網絡狀態重定向到活動 A 和活動 B
public static boolean isNetworkStatusAvialable(Context context) {
ConnectivityManager cm =
(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetwork = cm.getActiveNetworkInfo();
return activeNetwork != null &&
activeNetwork.isConnectedOrConnecting();
}
我檢查
if (isNetworkStatusAvialable(getApplicationContext())) {
// Load Activity B
} else {
Load Activity A and Toast Message, " No Internet"
}
提前致謝。
在這種情況下,您應該使用BroadcastReceiver
檢查網絡狀態,因為您想立即關閉當前活動並移動到其他活動。 所以下面是它的完整代碼:
連接狀態接收器.java
public class ConnectivityStatusReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
final ConnectivityManager connMgr = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo activeNetworkInfo = connMgr.getActiveNetworkInfo();
if (activeNetworkInfo != null) {
Toast.makeText(context, activeNetworkInfo.getTypeName() + " connected", Toast.LENGTH_SHORT).show();
// Your code to start Activity B
Activity activity = (Activity) context;
intent = new Intent(activity, ActivityB.class);
activity.startActivity(intent);
} else {
Toast.makeText(context, "No Internet or Network connection available", Toast.LENGTH_LONG).show();
}
}
}
主活動.java
public class MainActivity extends AppCompatActivity {
ConnectivityStatusReceiver connectivityStatusReceiver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
connectivityStatusReceiver = new ConnectivityStatusReceiver();
}
@Override
protected void onResume() {
super.onResume();
IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(connectivityStatusReceiver, intentFilter);
}
@Override
protected void onDestroy() {
super.onDestroy();
if (connectivityStatusReceiver != null) {
// unregister receiver
unregisterReceiver(connectivityStatusReceiver);
}
}
}
要關閉活動 A,您只需在清單中添加android:noHistory="true"
,如下所示:
<activity android:label="@string/app_name" android:name="ActivityA"/>
希望這會幫助你。
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