从广播接收器关闭顶部活动

Question

我按照本教程来检测网络变化并在没有网络连接时提醒用户：

http://viralpatel.net/blogs/android-internet-connection-status-network-change/

我修改了代码，以便在用户断开网络连接时打开一个名为 NoInternetConnection 的活动。

当用户重新连接到网络时，我想关闭 NoInternetConnection 活动。我无法用广播接收器解决这个问题。有关如何执行此操作的任何提示？

这是我的广播接收器：

public class NetworkChangeReceiver extends BroadcastReceiver {

    private static final String TAG = NetworkChangeReceiver.class.getSimpleName();

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

        String status = NetworkUtil.getConnectivityStatusString(context);
        Log.d(TAG, "status: " + status);

        ActivityManager am = (ActivityManager) context.
                getSystemService(Activity.ACTIVITY_SERVICE);
        String className = am.getRunningTasks(1).get(0).topActivity.getClassName();

        if(status == "connected"){
            if(className.toLowerCase().contains("nointernetactivity")){
                // check if the No Internet Activity context is visible
                Log.d(TAG, "Close noInternetActivity");

            }

        }else {
            if(!className.toLowerCase().contains("nointernetactivity")){
                Log.d(TAG, "opening NoInternetActivity");
                Intent i = new Intent(context, NoInternetActivity.class);
                i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                context.startActivity(i);
            }
        }
//        Toast.makeText(context, status, Toast.LENGTH_LONG).show();
    }
}

Answer 1

在我的 NoInternetActivity 中，我创建了一个广播接收器来关闭活动：

public class NoInternetActivity extends AppCompatActivity {

    private static Context context;
    private BroadcastReceiver _closeActivityReceiver = new CloseActivityReceiver();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_no_internet);
        context = this;

        IntentFilter filter = new IntentFilter("closeNoInternetActivity");
        this.registerReceiver(_closeActivityReceiver, filter);

    }

    private class CloseActivityReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            // close this damn activity!
            finish();
        }
    }

    @Override
    public void onDestroy(){
        super.onDestroy();
        this.unregisterReceiver(this._closeActivityReceiver);
    }

}

然后我在我的广播接收器中这样调用它：

        if(className.toLowerCase().contains("nointernetactivity")){
            // check if the No Internet Activity context is visible
            Log.d(TAG, "Close noInternetActivity");
            Intent in = new Intent("closeNoInternetActivity");
            context.sendBroadcast(in);

        }