Android-如何将数据从活动发送到服务? [英] Android- How to send data from activity to service?

问题描述

在我的应用程序中，我试图将数据从我的 MainActivity.class 发送到名为 bgservice.class 的服务.这是我的以下代码:

In my application I'm trying to send data from my MainActivity.class to a service called bgservice.class. This is my following code:

MainActivity.class:

MainActivity.class:

public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  Intent serviceIntent = new Intent(bgservice.class.getName());
  serviceIntent.putExtra("UserID", "123456");
  this.startService(serviceIntent);
}

bgservice.class:

bgservice.class:

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

  String userID = intent.getStringExtra("userID");
  System.out.println(userID);
  Toast.makeText(this,userID, Toast.LENGTH_LONG).show();
  return START_STICKY;

}

但是我没有在服务类中获取数据.这些是我得到的以下错误:

but I'm not getting the data in the service class. these are the following error I get:

02-25 09:05:41.166:E/AndroidRuntime(2633):

02-25 09:05:41.166: E/AndroidRuntime(2633):

java.lang.RuntimeException:无法启动活动
ComponentInfo {com.microapple.googleplace/com.microapple.googleplace.MainActivity}:java.lang.IllegalArgumentException:服务意图必须明确:意图{act = com.microapple.googleplace.bgservice(具有额外内容)}

java.lang.RuntimeException: Unable to start activity
ComponentInfo{com.microapple.googleplace/com.microapple.googleplace. MainActivity}: java.lang.IllegalArgumentException: Service Intent must be explicit: Intent { act=com.microapple.googleplace.bgservice (has extras) }

AndroidManifest.xml:

AndroidManifest.xml:

     ...
    <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >

    <activity
        android:name=".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>
    <service android:enabled="true" android:name=".bgservice" />
</application>
....

推荐答案

此处:

 Intent serviceIntent = new Intent(bgservice.class.getName());

将字符串传递给 Intent 构造函数以创建启动Service的Intent.Intent构造函数将String作为我们在 AndroidManifest.xml 中添加的Action名称.

Passing String to Intent constructor for creating Intent to start Service. Intent constructor takes String as a Action name which we have added in AndroidManifest.xml.

<service android:enabled="true" android:name=".bgservice">
<intent-filter >
        <action android:name="com.microapple.googleplace.bgservice" />
    </intent-filter>
</service>

现在使用 com.microapple.googleplace.bgservice 作为操作名称来创建Intent:

Now use com.microapple.googleplace.bgservice as action name to create Intent:

      Intent serviceIntent = new Intent("com.microapple.googleplace.bgservice");
      serviceIntent.putExtra("UserID", "123456");
      this.startService(serviceIntent);

OR

使用Intent压缩器，它将Context作为第一个参数，并将要启动的组件名称作为第二个参数:

Use Intent constrictor which takes Context as first parameter and component name which we want to start as second parameter :

  Intent serviceIntent = new Intent(this,bgservice.class);
  serviceIntent.putExtra("UserID", "123456");
  this.startService(serviceIntent);

并且还使用相同的键，该键用于在Intent中添加数据，当前使用 UserID 键添加值，但尝试使用 userID 键

And also use same key which using to add data in Intent currently adding value with UserID key but trying to get value using userID key

这篇关于Android-如何将数据从活动发送到服务?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！