What hapopens when you forget to add this Constructor to your custom view:

11-18 10:08:34.451: E/AndroidRuntime(309): FATAL EXCEPTION: main
11-18 10:08:34.451: E/AndroidRuntime(309): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.clipboardtest/com.example.clipboardtest.MainActivity}: android.view.InflateException: Binary XML file line #11: Error inflating class com.example.clipboardtest.SelectableTextView
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread.access$2300(ActivityThread.java:125)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.os.Handler.dispatchMessage(Handler.java:99)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.os.Looper.loop(Looper.java:123)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread.main(ActivityThread.java:4627)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at java.lang.reflect.Method.invokeNative(Native Method)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at java.lang.reflect.Method.invoke(Method.java:521)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at dalvik.system.NativeStart.main(Native Method)
11-18 10:08:34.451: E/AndroidRuntime(309): Caused by: android.view.InflateException: Binary XML file line #11: Error inflating class com.example.clipboardtest.SelectableTextView
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.createView(LayoutInflater.java:503)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.createViewFromTag(LayoutInflater.java:565)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.rInflate(LayoutInflater.java:618)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:407)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:320)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.inflate(LayoutInflater.java:276)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at com.android.internal.policy.impl.PhoneWindow.setContentView(PhoneWindow.java:198)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.Activity.setContentView(Activity.java:1647)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at com.example.clipboardtest.MainActivity.onCreate(MainActivity.java:28)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)
11-18 10:08:34.451: E/AndroidRuntime(309): 	... 11 more
11-18 10:08:34.451: E/AndroidRuntime(309): Caused by: java.lang.NoSuchMethodException: SelectableTextView(Context,AttributeSet)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at java.lang.Class.getMatchingConstructor(Class.java:660)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at java.lang.Class.getConstructor(Class.java:477)
11-18 10:08:34.451: E/AndroidRuntime(309): 	at android.view.LayoutInflater.createView(LayoutInflater.java:475)
11-18 10:08:34.451: E/AndroidRuntime(309): 	... 21 more

You cannot add it to XML and use various standard attributes with it...