hi all: i found a surprised problem descripted following manifest.xml <application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".IntentMainActivity" android:label="@string/app_name"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".CategoryAltertiveActivity" android:label="CategoryAltertive"> <intent-filter android:label="alternative"> <action android:name="edu.lib.altertive" /> <category android:name="android.intent.category.ALTERNATIVE" /> </intent-filter> </activity> </application> java code : Intent intent=new Intent(); intent.setAction("edu.lib.altertive"); intent.addCategory(Intent.CATEGORY_ALTERNATIVE); startActivity(intent); i got an ActivityNotFoundException,but i have already registered CategoryAltertiveActivity in manifest.xml ,and by Intent intent =new Intent(this,CategoryAltertiveActivity.class) startActivity(intent) it run normally,and use getPackageManager.queryIntentActivity(intent),return result which included ActivityInfo of CategoryAltertiveActivity. why?
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