开创了机器人全局函数 [英] creating global functions in android

问题描述

我想要做的就是创建一个具有多种功​​能，我想在整个项目中使用它的Java文件。例如检查Internet连接。然后，我想呼吁每个活动的功能。有谁知道该怎么做？

What i want to do is create a java file that has various functions and I would like to use it across the whole project. For example check Internet Connection. Then I would like to call that function on each activity. Does anyone know how to do that?

推荐答案

创建类像这样的在这里添加的功能：

Create Class like this and add your functions here :

package com.mytest;

import android.content.Context;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;

public class MyGlobals{
    Context mContext;

    // constructor
    public MyGlobals(Context context){
        this.mContext = context;
    }

    public String getUserName(){
        return "test";
    }

    public boolean isNetworkConnected() {
          ConnectivityManager cm = (ConnectivityManager) mContext.getSystemService(Context.CONNECTIVITY_SERVICE);
          NetworkInfo ni = cm.getActiveNetworkInfo();
          if (ni == null) {
           // There are no active networks.
           return false;
          } else
           return true;
    }
}

然后在你的活动声明实例：

Then declare instance in your activity :

MyGlobals myGlog;

然后初始化并从全局类的使用方法：

Then initialize and use methods from that global class :

myGlog = new MyGlobals(getApplicationContext());
String username = myGlog.getUserName();

boolean inConnected = myGlog.isNetworkConnected();

在你的清单文件所需的权限：

Permission required in your Manifest file :

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

感谢。

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