更改连接时在来自 BroadcastReceiver 的 activity 消息中显示

Question

我有控制连接的 BroadCastReceiver。当我失去连接时，我会显示消息，但不是通用 toast，而是我设计的 "layout"。我的广播是用于连接的通用广播：

public class ConnectivityChangeReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(final Context context, final Intent intent) {
        ConnectivityManager cm =(ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

        if (cm.getActiveNetworkInfo()!=null){
            Toast.makeText(context, "Connected to Internet", Toast.LENGTH_LONG).show();
        }
        else{
            /** HERE INSTEAD OF TOAST, IWOULD DISPLAY MESSAGE ON ACTIVITY **/
            Toast.makeText(context, "not connection", Toast.LENGTH_LONG).show();

            Log.i("INTERNET", "---------------------> Internet Disconnected. ");
        }
    }

}

还有我的"no_connection_layout"

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="52dp"
        android:text="No InterNeT"
        android:id="@+id/no_connection"
        android:layout_weight="1"

        android:layout_gravity="center|top"
        android:gravity="center"
        android:background="@android:color/holo_green_dark"
        android:textStyle="bold"
        android:textColor="#ffffff"
        />
</FrameLayout>

有没有办法让这个布局模糊显示当前 activity？

Answer 1

创建一个全局布尔值，并在有互联网连接时将其设置为真，在未连接时将其设置为假。然后创建一个异步任务 class doinBackground 方法并在变量更改时连续检查它，并且从 postExecute 方法您可以在 UI 中进行更改。如果您需要更多帮助，请联系我。

Answer 2

@Override
public void onReceive(final Context context, final Intent intent) {

    //Obviously cleanup where you do this stuff, to make it efficient
    //If your context is a fragment you need to cast to fragment and then do getActivity instead
    final View noConnectionBanner = ((Activity) context).findViewById(R.id.no_connection)
    ConnectivityManager cm = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);

    if (cm.getActiveNetworkInfo() != null) {
        noConnectionBanner.setVisibility(View.GONE);
    } else {
        noConnectionBanner.setVisibility(View.VISIBLE);
    }
}

Answer 3

只需触发一个函数，然后编写您要显示的视图元素即可。

  public class ConnectionBroadReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {

        ConnectivityManager cm = (ConnectivityManager)
                context.getSystemService(Context.CONNECTIVITY_SERVICE);

        NetworkInfo netInfo = cm.getActiveNetworkInfo();

        if (netInfo != null && netInfo.isConnectedOrConnecting()) {
        } else {
            Visibler();

        }


    }

}

@Override
protected void onResume() {
    this.connectionBroadReceiver = new ConnectionBroadReceiver();
    registerReceiver(this.connectionBroadReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
    super.onResume();
}

@Override
protected void onPause() {
    unregisterReceiver(this.connectionBroadReceiver);
    super.onPause();
}

然后在主程序里面，

   @Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    floatingActionButton = (FloatingActionButton) findViewById(R.id.floater);
}

private void Visibler() {
    floatingActionButton.setVisibility(View.VISIBLE);
}

更改连接时在来自 BroadcastReceiver 的 activity 消息中显示

Show in activity message from BroadcastReceiver when change connectivity

android

broadcastreceiver