reading XML layout contains a SurfaceView

[Dov Ezra]

Hi all,

I want to build a gui with some buttons and my own surfaceView.

my XML looks like this

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"> 
    <Button
        android:id="@+id/btn1"
        android:layout_width="200dp"
        android:layout_height="20dip"
        android:text="button1"/>
    <Button
        android:id="@+id/btn2"
        android:layout_width="200dp"
        android:layout_height="20dip"
        android:text="button2"/>
    
    <org.me.myapp.MySurface
        android:id="@+id/surf"
        android:layout_width="300dp"
        android:layout_height="200dp"
        androidLgravity="center"
        />

    
</LinearLayout>

and in my activity I'm trying to load this layout:

public class MyActivity extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);       
        setContentView(R.layout.main);

but the app crush when calling setContentView.
it is also crush when I try to call
View view= this.getLayoutInflater().inflate(R.layout.main, null);
the next line here should be setContentView(view);

how this inflation should be done?

[Ulf Dittmer]

There should be a stacktrace in the logcat output; post that here.

[Dov Ezra]

How do I view the logcat output on netbeans? or eclipse?

[Dov Ezra]

OK, I find out how to see the logcat on eclipse and how to dump it into a text file.
but Java ranch don't allow to attach text files.
so I have to paste this huge amount of text here, I guess.

Also, I attached the java and xml code for this app, so you can have the context.
I don't sure how to read this. toward the end of the log there is a report on socketException and
one line saying: "Launch timeout has expired, giving up wake lock!"
is this related to my costume surface?

E/AndroidRuntime(  338): java.lang.RuntimeException: Unable to start activity ComponentInfo{me.tests/me.tests.MainActivity}: android.view.InflateException: Binary XML file line #8: Error inflating class me.tests.MySurf

E/AndroidRuntime(  338): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1622)

E/AndroidRuntime(  338): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1638)

E/AndroidRuntime(  338): 	at android.app.ActivityThread.access$1500(ActivityThread.java:117)

E/AndroidRuntime(  338): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:928)

E/AndroidRuntime(  338): 	at android.os.Handler.dispatchMessage(Handler.java:99)

E/AndroidRuntime(  338): 	at android.os.Looper.loop(Looper.java:123)

E/AndroidRuntime(  338): 	at android.app.ActivityThread.main(ActivityThread.java:3647)

E/AndroidRuntime(  338): 	at java.lang.reflect.Method.invokeNative(Native Method)

E/AndroidRuntime(  338): 	at java.lang.reflect.Method.invoke(Method.java:507)

E/AndroidRuntime(  338): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)

E/AndroidRuntime(  338): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)

E/AndroidRuntime(  338): 	at dalvik.system.NativeStart.main(Native Method)

E/AndroidRuntime(  338): Caused by: android.view.InflateException: Binary XML file line #8: Error inflating class me.tests.MySurf

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.createView(LayoutInflater.java:508)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:570)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.rInflate(LayoutInflater.java:623)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:408)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:320)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:276)

E/AndroidRuntime(  338): 	at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:207)

E/AndroidRuntime(  338): 	at android.app.Activity.setContentView(Activity.java:1657)

E/AndroidRuntime(  338): 	at me.tests.MainActivity.onCreate(MainActivity.java:11)

E/AndroidRuntime(  338): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)

E/AndroidRuntime(  338): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1586)

E/AndroidRuntime(  338): 	... 11 more

E/AndroidRuntime(  338): Caused by: java.lang.NoSuchMethodException: MySurf(Context,AttributeSet)

E/AndroidRuntime(  338): 	at java.lang.Class.getMatchingConstructor(Class.java:643)

E/AndroidRuntime(  338): 	at java.lang.Class.getConstructor(Class.java:472)

E/AndroidRuntime(  338): 	at android.view.LayoutInflater.createView(LayoutInflater.java:480)

[Ulf Dittmer]

Next time, please post just the exception stack traces.

So: Your layout uses a class me.tests.MySurf class which does not have a MySurf(Context,AttributeSet) constructor. The class should start somewhat like this:

	public MySurf (Context context) {
		super(context);
	}

	public MySurf (Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public MySurf (Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

[Dov Ezra]

Thanks.
so it just a missing constructor?
maybe, in the case where the costume view don't need parameters in the constructor,
does the version that takes only context will suffice?

The log seems to me different then the one I posted, but then I noticed that edit it.
I'll try to handle logcat better next time.