本篇文章给大家谈谈如何从ChangeNotifier推送路由？，同时本文还将给你拓展AndroidRecyclerView批量更新notifyItemRangeChanged、android–setR

本篇文章给大家谈谈如何从ChangeNotifier推送路由？，同时本文还将给你拓展Android RecyclerView批量更新notifyItemRangeChanged、android – setRangeNotifier(RangeNotifier)已被弃用？、android – 找不到方法createNotificationChannel(NotificationChannel)、axios发布请求后的vue-router推送路由等相关知识，希望对各位有所帮助，不要忘了收藏本站喔。

• 如何从ChangeNotifier推送路由？
• Android RecyclerView批量更新notifyItemRangeChanged
• android – setRangeNotifier(RangeNotifier)已被弃用？
• android – 找不到方法createNotificationChannel(NotificationChannel)
• axios发布请求后的vue-router推送路由

如何从ChangeNotifier推送路由？

对我来说，这似乎对所有人都显而易见。您只需要将上下文传递到ChangeNotifier中即可，然后Navigator.pushNamed(context,routeName);

我正在寻找一种方法，可以从适当的小部件树中实现这一目标。我不是只从模型中进行操作-我仍然不确定这是最佳做法-但它有效。

1. main.dart
 MaterialApp(
navigatorKey: NavigationService().navigatorKey,)

2创建新课程

class NavigationService {
 final GlobalKey<NavigatorState> navigatorKey =
  new GlobalKey<NavigatorState>();
 GlobalKey<ScaffoldState> scaffoldKey = new GlobalKey<ScaffoldState>();
Future<dynamic> navigateTo(String routeName) {
return navigatorKey.currentState.pushNamed(routeName);
}}

1. 在Model类中可在任何函数中使用

   NavigationService>().navigateTo(homePageRoute)  // your router name
   

Android RecyclerView批量更新notifyItemRangeChanged

/**
         * Notify any registered observers that the <code>itemCount</code> items starting at
         * position <code>positionStart</code> have changed.
         * Equivalent to calling <code>notifyItemRangeChanged(position, itemCount, null);</code>.
         *
         * <p>This is an item change event, not a structural change event. It indicates that
         * any reflection of the data in the given position range is out of date and should
         * be updated. The items in the given range retain the same identity.</p>
         *
         * @param positionStart Position of the first item that has changed
         * @param itemCount Number of items that have changed
         *
         * @see #notifyItemChanged(int)
         */
        public final void notifyItemRangeChanged(int positionStart, int itemCount) {
            mObservable.notifyItemRangeChanged(positionStart, itemCount);
        }

package zhangphil.demo;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.Random;


public class MainActivity extends Activity {
    private ArrayList data = new ArrayList();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        for (int i = 0; i < 5; i++) {
            data.add(System.currentTimeMillis());
        }

        RecyclerView mRecyclerView = findViewById(R.id.recycler_view);

        LinearLayoutManager mLayoutManager = new LinearLayoutManager(this);
        mLayoutManager.setOrientation(LinearLayout.VERTICAL);
        mRecyclerView.setLayoutManager(mLayoutManager);

        final RecyclerView.Adapter mAdapter = new MyAdapter();
        mRecyclerView.setAdapter(mAdapter);

        final Random random = new Random();

        findViewById(R.id.button).setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int count = random.nextInt(data.size());
                for (int i = 0; i < count; i++) {
                    data.set(i, System.currentTimeMillis());
                }

                mAdapter.notifyItemRangeChanged(0, count);
            }
        });
    }


    private class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
        public MyAdapter() {
            super();
        }

        @Override
        public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
            View view = LayoutInflater.from(getApplicationContext()).inflate(android.R.layout.simple_list_item_2, null);
            ViewHolder holder = new ViewHolder(view);
            return holder;
        }

        @Override
        public void onBindViewHolder(ViewHolder viewHolder, int i) {
            viewHolder.text1.setText(i + "");
            viewHolder.text2.setText(data.get(i) + "");
        }

        @Override
        public int getItemCount() {
            return data.size();
        }

        public class ViewHolder extends RecyclerView.ViewHolder {
            public TextView text1;
            public TextView text2;

            public ViewHolder(View itemView) {
                super(itemView);
                text1 = itemView.findViewById(android.R.id.text1);
                text1.setTextColor(Color.RED);
                text2 = itemView.findViewById(android.R.id.text2);
                text2.setTextColor(Color.BLUE);
            }
        }
    }
}

android – setRangeNotifier(RangeNotifier)已被弃用？

我正在使用alt.beacon库,现在我收到此警告：

warning: [deprecation] setRangeNotifier(RangeNotifier) in BeaconManager has been deprecated.

但更换的是什么？我需要对区域中的信标进行测距,并且回调RangeNotifier对于实现此功能至关重要.

public interface RangeNotifier {
    void didRangeBeaconsInRegion(Collection<Beacon> var1, Region var2);
}

任何人都有一个新库如何工作的样本？

谢谢！

解决方法:

从版本2.9开始,您可能有多个RangeNotifier.所以不要打电话：

beaconManager.setRangeNotifier(rangeNotifier);

只需致电：

beaconManager.addRangeNotifier(rangeNotifier);

android – 找不到方法createNotificationChannel(NotificationChannel)

notificationmanagerCompat notificationmanager = notificationmanagerCompat.from(this);
// .. building mChannel,the NotificationChannel instance
notificationmanager.createNotificationChannel(mChannel);

Error:(67,32) error: cannot find symbol method createNotificationChannel(NotificationChannel)

compile 'com.android.support:support-compat:27.0.0'

axios发布请求后的vue-router推送路由

好，终于我明白了。 this.$router.push()返回的诺言我没有很好地处理。最终的解决方案如下：

axios.post('/user',{ email: this.email })
  .then((response) => {
    if (!response.data) {
      void this.$router.push({ path: '/register',params: { user: defaultUser } });
    } else {
      void this.$router.push({ path: '/login',params: { user: response.data } });
    }
  })
  .catch((error) => {
    console.log(error);
  });

由于拥有void会触发eslint no-void语法错误，并且我不在乎此promise的返回值，因此我通过添加/* eslint-disable no-void */来抑制警告。

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