Android应用程序没有GUI [英] Android application without GUI

问题描述

我一直在开发利用广播接收器没有用户界面的简单应用程序。

该应用程序不包含任何活动。

我给了必要的权限。

我拿了code从这个网址：http://developerandro.blogspot.in/2013/09/check-internet-connection-using.html

该应用程序显示举杯未连接互联网当我点击的变化wifi的状态。它的正常工作。

但我的问题是有，我没有在我的清单文件中注册的活动。所以我删除我的清单这些行。于是敬酒不显示，我查了日志了。在不断变化的无线状态无输出。

为什么发生这种情况？请帮我家伙...

下面是清单文件：

 ＆LT;？XML版本=1.0编码=UTF-8＆GT？;
＆LT;清单的xmlns：机器人=htt​​p://schemas.android.com/apk/res/android
    包=com.example.broadcast_internetcheck
    安卓版code =1
    机器人：=的versionName1.0＆GT;    ＆LT;用途-SDK
        安卓的minSdkVersion =8
        机器人：targetSdkVersion =17/＆GT;    ＆LT;使用许可权的android：NAME =android.permission.ACCESS_NETWORK_STATE/＆GT;    ＆lt;应用
        机器人：allowBackup =真
        机器人：图标=@绘制/ ic_launcher
        机器人：标签=@字符串/ APP_NAME
        机器人：主题=@风格/ AppTheme＆GT;
        ＆LT;活动
            机器人：名字=com.example.broadcast_internetcheck.MainActivity
            机器人：标签=@字符串/ APP_NAME＆GT;
            ＆所述;意图滤光器＆gt;
                ＆lt;作用机器人：名字=android.intent.action.MAIN/＆GT;                ＆LT;类机器人：名字=android.intent.category.LAUNCHER/＆GT;
            ＆所述; /意图滤光器＆gt;
        ＆LT; /活性GT;        ＆lt;接收
            机器人：名字=com.example.broadcast_internetcheck.NetworkChangeReceiver
            机器人：标签=NetworkChangeReceiver＆GT;
            ＆所述;意图滤光器＆gt;
                ＆lt;作用机器人：名字=android.net.conn.CONNECTIVITY_CHANGE/＆GT;
                ＆lt;作用机器人：名字=android.net.wifi.WIFI_STATE_CHANGED/＆GT;
            ＆所述; /意图滤光器＆gt;
        ＆LT; /接收器＆GT;
    ＆LT; /用途＆gt;＆LT; /清单＆GT;
 

下面是我的广播接收器类：

 公共类NetworkChangeReceiver扩展广播接收器{  @覆盖
     公共无效的onReceive（最终上下文的背景下，最终的意图意图）{         字符串状态= NetworkUtil.getConnectivityStatusString（背景）;
          / *上面一行将返回无线网络的状态* /
         Toast.makeText（上下文，状态Toast.LENGTH_LONG）.show（）;     }
}
 

解决方案

您将需要创建一个将在触发服务的虚拟活动的onCreate（）假人，也许非UI与完成的（）。

如果没有所要求的实现是不可能的，尤以上的Andr​​oid 3.1。

<一个href=\"http://developer.android.com/about/versions/android-3.1.html#launchcontrols\">http://developer.android.com/about/versions/android-3.1.html#launchcontrols

<一href=\"http://stackoverflow.com/questions/14064132/run-only-a-background-service-when-application-start\">Run只有一个后台服务时，应用程序启动结果
没有活动启动Android应用程序结果
<一href=\"http://commonsware.com/blog/2011/07/13/boot-completed-regression-confirmed.html\">http://commonsware.com/blog/2011/07/13/boot-completed-regression-confirmed.html

和更多的服务：结果
<一href=\"http://developer.android.com/guide/components/services.html\">http://developer.android.com/guide/components/services.html

<一href=\"https://developer.android.com/training/run-background-service/create-service.html\">https://developer.android.com/training/run-background-service/create-service.html

<一href=\"http://www.vogella.com/tutorials/AndroidServices/article.html\">http://www.vogella.com/tutorials/AndroidServices/article.html

I have been developing a simple application without UI using broadcast receiver.

The app doesn't contain any ACTIVITIES.

I have given necessary permissions.

I took the code from this url:http://developerandro.blogspot.in/2013/09/check-internet-connection-using.html

The app shows a toast "Not connected to internet" when I click change wifi state. It's working correctly.

But my question is There is an activity registered in my manifest file which I don't have. So I delete those lines from my manifest. Then no toasts are shown and I checked the logs too. No output on changing wifi state.

Why this happened? Please help me guys...

Here is the manifest file:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.broadcast_internetcheck"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />

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

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.broadcast_internetcheck.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

        <receiver
            android:name="com.example.broadcast_internetcheck.NetworkChangeReceiver"
            android:label="NetworkChangeReceiver" >
            <intent-filter>
                <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
                <action android:name="android.net.wifi.WIFI_STATE_CHANGED" />
            </intent-filter>
        </receiver>
    </application>

</manifest>

Here is my Broadcastreceiver class:

public class NetworkChangeReceiver extends BroadcastReceiver{

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

         String status = NetworkUtil.getConnectivityStatusString(context);
          /*Above line will return the status of wifi */
         Toast.makeText(context, status, Toast.LENGTH_LONG).show();

     }
}

解决方案

You will need to create a dummy activity for a Service which will be triggered in the onCreate() of the dummy, maybe a non-UI with finish() .

Without that the required implementation is not possible, esp above Android 3.1.

http://developer.android.com/about/versions/android-3.1.html#launchcontrols
Run only a background service when application start
Start android application without activity
http://commonsware.com/blog/2011/07/13/boot-completed-regression-confirmed.html

And for more on Service:
http://developer.android.com/guide/components/services.html
https://developer.android.com/training/run-background-service/create-service.html
http://www.vogella.com/tutorials/AndroidServices/article.html

这篇关于Android应用程序没有GUI的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！