android - Logcat doesn't show & phone crashes -

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so, using android studio vor developing android app.

the first problem when debug app on phone , crashes (no matter reason is) don't error message, frozen phone doesn't work , have force-restart it. idea why happening?

second problem logcat doesn't show in logs while debug on phone don't know caused crash.

on emulator have no crashes, don't have google play services there either (that's want test , think causes unknown crash).

thx


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