android-activity

问题 how do you keep the activity from restarting when the screen rotates or when then user slides the keyboard on the phone? Is this possible? Is there a work around or something? All relevant answers are appreciated. 回答1: You can do this by declaring a specific attribute in your activity element in your manifest.xml . The element in question is called android:configChanges , and you need to register the string value of orientation . <activity android:name=".MyActivity" android:configChanges=

问题 I'm trying to finish an activity and not have it on the recents. The following code seems to work on KitKat but not on lolipop, as the activity always shows on the recents. intentInvite = new Intent( context, OnInviteActivity.class ); intentInvite.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intentInvite.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intentInvite = createInviteIntent( intentCloud, intentInvite ); context.startActivity( intentInvite ); AndroidManifest.xml <activity android:name="

问题 I'm trying to finish an activity and not have it on the recents. The following code seems to work on KitKat but not on lolipop, as the activity always shows on the recents. intentInvite = new Intent( context, OnInviteActivity.class ); intentInvite.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intentInvite.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intentInvite = createInviteIntent( intentCloud, intentInvite ); context.startActivity( intentInvite ); AndroidManifest.xml <activity android:name="

问题 I'm trying to finish an activity and not have it on the recents. The following code seems to work on KitKat but not on lolipop, as the activity always shows on the recents. intentInvite = new Intent( context, OnInviteActivity.class ); intentInvite.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP); intentInvite.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK); intentInvite = createInviteIntent( intentCloud, intentInvite ); context.startActivity( intentInvite ); AndroidManifest.xml <activity android:name="

问题 I have alway used onCreate method inside my Activity lifecycle to start or restore from a saved state, but recently found that there is another onCreate method which contains a PersistableBundle : @Override public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); } I only found that it has been added since Android 21. Could anyone please give a complete information about this method, when it calls and the usage?

问题 I have alway used onCreate method inside my Activity lifecycle to start or restore from a saved state, but recently found that there is another onCreate method which contains a PersistableBundle : @Override public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); } I only found that it has been added since Android 21. Could anyone please give a complete information about this method, when it calls and the usage?

问题 I have alway used onCreate method inside my Activity lifecycle to start or restore from a saved state, but recently found that there is another onCreate method which contains a PersistableBundle : @Override public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) { super.onCreate(savedInstanceState, persistentState); } I only found that it has been added since Android 21. Could anyone please give a complete information about this method, when it calls and the usage?

问题 So I have a strange problem, and I'm not entirely sure what all information I should provide, but I'll do my best -- just let me know if I need to add more info. I'm having an issue that when I finish my Activity and return to the previous Activity (or launch it with a new Intent -- the problem seems to be centered on finishing the Activity ) the UI performance drops drastically for about six or seven seconds, then returns to normal. From LogCat , this warning appears consistently: 07-11 22

问题 I have a LoginActivity as my launcher screen. And SettingsActivity as my fifth screen . I have a logout button in settings screen. On clcik of this button, how can i go to Screen-1 (i.e LoginActivity) by clearing all remaining activities (i.e 2nd, 3rd, 4th) from activity stack? Note : i have finished LoginActivity but not remaining activities. Thanks in advance 回答1: Simple, set an onclick on your logout button and then add this to your intent: Intent newIntent = new Intent(this, login.class);

问题 How do I use double tap events in an activity? The double tap event or long click method working (though the method is getting overriden) I've just put in a toast message in each of these methods and yet no result! Can you help? 回答1: The easiest way to do a double-tap is to detect it with a GestureDetector. The "trick" is to be sure you delegate the Activity's onTouchEvent to the GestureDetector's onTouchEvent: import android.app.Activity; import android.os.Bundle; import android.view