HomeActivity.java 文件源码

private void checkConnectivity() {
    final ConnectivityManager connectivityManager
            = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
    final NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
    connected = activeNetworkInfo != null && activeNetworkInfo.isConnected();
    if (!connected) {
        loading.setVisibility(View.GONE);
        if (noConnection == null) {
            final ViewStub stub = (ViewStub) findViewById(R.id.stub_no_connection);
            noConnection = (ImageView) stub.inflate();
        }
        final AnimatedVectorDrawable avd =
                (AnimatedVectorDrawable) getDrawable(R.drawable.avd_no_connection);
        noConnection.setImageDrawable(avd);
        avd.start();

        connectivityManager.registerNetworkCallback(
                new NetworkRequest.Builder()
                .addCapability(NetworkCapabilities.NET_CAPABILITY_INTERNET).build(),
                connectivityCallback);
        monitoringConnectivity = true;
    }
}