今天在学习Android的Service组件的时候,在AndroidMainfest.xml中定义了
<service
android:name=".BindService"
android:enabled="true"
android:exported="true" >
<intent-filter>
<action android:name="com.example.user.firstapp.FIRST_SERVICE"/>
</intent-filter>
</service>
然后在activity中用如下代码绑定service:
final Intent intent = new Intent();
intent.setAction("com.example.user.firstapp.FIRST_SERVICE");
bindService(intent,coon,Service.BIND_AUTO_CREATE);
这时候会报错:
IllegalArgumentException: Service Intent must be explicit
经过查找相关资料,发现是因为Android5.0中service的intent一定要显性声明,当这样绑定的时候不会报错。
final Intent intent = new Intent(this,BindService.class);
bindService(intent,coon,Service.BIND_AUTO_CREATE)
在http://blog.android-develop.com/2014/10/android-l-api-21-javalangillegalargumen.html上看到一个解决方法,可以将隐性调用变成显性调用。先定义一个函数:
/***
* Android L (lollipop, API 21) introduced a new problem when trying to invoke implicit intent,
* "java.lang.IllegalArgumentException: Service Intent must be explicit"
*
* If you are using an implicit intent, and know only 1 target would answer this intent,
* This method will help you turn the implicit intent into the explicit form.
*
* Inspired from SO answer: http://*.com/a/26318757/1446466
* @param context
* @param implicitIntent - The original implicit intent
* @return Explicit Intent created from the implicit original intent
*/
public static Intent createExplicitFromImplicitIntent(Context context, Intent implicitIntent) {
// Retrieve all services that can match the given intent
PackageManager pm = context.getPackageManager();
List<ResolveInfo> resolveInfo = pm.queryIntentServices(implicitIntent, ); // Make sure only one match was found
if (resolveInfo == null || resolveInfo.size() != ) {
return null;
} // Get component info and create ComponentName
ResolveInfo serviceInfo = resolveInfo.get();
String packageName = serviceInfo.serviceInfo.packageName;
String className = serviceInfo.serviceInfo.name;
ComponentName component = new ComponentName(packageName, className); // Create a new intent. Use the old one for extras and such reuse
Intent explicitIntent = new Intent(implicitIntent); // Set the component to be explicit
explicitIntent.setComponent(component); return explicitIntent;
}
然后调用
final Intent intent = new Intent();
intent.setAction("com.example.user.firstapp.FIRST_SERVICE");
final Intent eintent = new Intent(createExplicitFromImplicitIntent(this,intent));
bindService(eintent,conn, Service.BIND_AUTO_CREATE);
这样也可以解决问题。