Resolve Intent Filter Collision
Description
The <intent-filter> element defines how your activity
can be invoked by another activity.
What happens if another activity in either the same or a separate application has the same filter name?
Example
For example, suppose your application has another
activity named Activity3, with the
following entry in the AndroidManifest.xml file:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.java2s.app" >
/*from ww w .ja va2 s. c om*/
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.java2s.app.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>
<activity
android:label="Second Activity"
android:name=".SecondActivity" >
<intent-filter >
<action android:name="com.java2s.SecondActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
<activity
android:label="Third Activity"
android:name=".ThirdActivity" >
<intent-filter >
<action android:name="com.java2s.SecondActivity" />
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</activity>
</application>
</manifest>
If you call the startActivity() method with the following intent,
then the Android OS will
display a selection of activities:
startActivity(new Intent("com.java2s.SecondActivity"));
If you check the "Use by default for this action" item and then select an activity,
then the next time
the intent "com.java2s.SecondActivity" is called again, it will launch the previous
activity that you have selected.
Clear
To clear this default,
- go to the Settings application in Android
- select Apps -> Manage applications,
- select the application name.
- When the details of the application are shown, scroll down to the bottom and click the Clear defaults button.