我编写了一个应用程序的服务。我尝试使用以下代码从第二个应用程序调用此服务:
Intent intent = new Intent () ;
intent.setClassName("com.test" ,"com.test.DownloadService") ;
// Create a new Messenger for the communication back
Messenger messenger = new Messenger(handler);
intent.putExtra("MESSENGER", messenger);
intent.setData(Uri.parse("http://www.vogella.com/index.html"));
intent.putExtra("urlpath", "http://www.vogella.com/index.html");
this.startService(intent);
它会引发以下异常
07-10 09:27:28.819: ERROR/AndroidRuntime(4226): FATAL EXCEPTION: main
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.inject/com.inject.MyActivity}: java.lang.SecurityException: Not allowed to start service Intent { dat=http://www.vogella.com/index.html cmp=com.test/.DownloadService (has extras) } without permission not exported from uid 10109
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1971)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1996)
at android.app.ActivityThread.access$700(ActivityThread.java:126)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1156)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4458)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.SecurityException: Not allowed to start service Intent { dat=http://www.vogella.com/index.html cmp=com.test/.DownloadService (has extras) } without permission not exported from uid 10109
at android.app.ContextImpl.startService(ContextImpl.java:1122)
at android.content.ContextWrapper.startService(ContextWrapper.java:359)
at com.inject.MyActivity.onCreate(MyActivity.java:28)
at android.app.Activity.performCreate(Activity.java:4465)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1935)
... 11 more
为什么会出现这个权限问题?当我从同一个应用程序调用服务时,以下代码功能完美:
Intent intent = new Intent(this, DownloadService.class);
// Create a new Messenger for the communication back
Messenger messenger = new Messenger(handler);
intent.putExtra("MESSENGER", messenger);
intent.setData(Uri.parse("http://www.vogella.com/index.html"));
intent.putExtra("urlpath", "http://www.vogella.com/index.html");
startService(intent);
当我从一个不同的应用程序调用服务时,尽管我在App2的清单文件中已经授予了所有必需的权限,但为什么会出现权限问题呢?
编辑
App2的清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.inject"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="14"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
<activity android:name="MyActivity"
android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
</application>
</manifest>
包含服务的App1清单文件
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.test"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="14"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name" >
<activity
android:name=".MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
</intent-filter>
</activity>
<service android:name="DownloadService" >
</service>
</application>
</manifest>