cant see breakpoints when I want to debug using device

When I'm using the device and click on my debug the application is lunched in my device but I cant see the break points .

In the debug window the application wh开发者_如何学编程om run is shown for a second and then disappear and I cant debug my application on the device .

Did I miss something ? can someone please explain me what I did wrong and correct me

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my problem was not adding the

<application android:debuggable="true".../>

in the right place ...