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POHow can I dynamically add Views that use XML Layouts to the ContentView?
 

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  1. POHow can I dynamically add Views that use XML Layouts to the ContentView?
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    <p>Within my main Activity, I create a FrameLayout with child Views and set it as the ContentView. Now, staying within the same Activity, after onCreate() has executed fully, I need to be able to add and remove child Views from the FrameLayout, dynamically. I achieved this by using a Handler to pause the main Thread and then add or removed the child Views as needed.</p> <p>This all works great when I am dealing with Views that I programmatically create, but when I attempt to do the same with a View that uses a XML layout, I get a Null Pointer Exception from the ViewGroup that I am trying to add to the FrameLayout.</p> <p>Are there specific steps I can use to achieve this without the use of Fragments?</p> <p>I can elaborate more if some don't understand what I am asking. I could provide code chunks if it would help but I think most will get the gist of what I am doing from my short explanation. I am just looking for someone to point me into the right direction.</p> <p>Here is the LogCat chunk for the exception taht was thrown:</p> <pre><code>11-15 13:40:42.977: E/AndroidRuntime(14956): FATAL EXCEPTION: main 11-15 13:40:42.977: E/AndroidRuntime(14956): java.lang.NullPointerException 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.view.ViewGroup.addView(ViewGroup.java:1821) 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.view.ViewGroup.addView(ViewGroup.java:1808) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.beastcodes.framework.impl.AndroidGame.addScreenFragment(AndroidGame.java:207) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.beastcodes.framework.impl.AndroidGame.addAllScreenFragments(AndroidGame.java:213) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.beastcodes.framework.impl.AndroidGame.access$2(AndroidGame.java:211) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.beastcodes.framework.impl.AndroidGame$3.run(AndroidGame.java:61) 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.os.Handler.handleCallback(Handler.java:587) 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.os.Handler.dispatchMessage(Handler.java:92) 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.os.Looper.loop(Looper.java:130) 11-15 13:40:42.977: E/AndroidRuntime(14956): at android.app.ActivityThread.main(ActivityThread.java:3691) 11-15 13:40:42.977: E/AndroidRuntime(14956): at java.lang.reflect.Method.invokeNative(Native Method) 11-15 13:40:42.977: E/AndroidRuntime(14956): at java.lang.reflect.Method.invoke(Method.java:507) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:907) 11-15 13:40:42.977: E/AndroidRuntime(14956): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:665) 11-15 13:40:42.977: E/AndroidRuntime(14956): at dalvik.system.NativeStart.main(Native Method) </code></pre>
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    1. COPlease post the stack trace for the exception from logcat. And `I achieved this by using a Handler to pause the main Thread` is both unnecessary and potentially harmful. I think Android should make you have to go through enormous hoops to use sleep() in a UI thread.
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      1. POHow can I dynamically add Views that use XML Layouts to the ContentView?
      1. USSimon
    2. COI will post the LogCat when I get back to my system, but all it says is that the ViewGroup that I am attempting to add to the FrameLayout is null. Also, I don't understand the potential harm in using a Handler to achieve this? I was actually under impression that this was the only way of going about it without switching to a new activity. How else would I be able to create a View in a separate thread and then load it into the ContentView of the main thread so that the new View is displayed?
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      1. POHow can I dynamically add Views that use XML Layouts to the ContentView?
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    3. COYou just add the child view then invalidate() the parent.
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      1. POHow can I dynamically add Views that use XML Layouts to the ContentView?
      1. USSimon
 

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