Building and Running on a device from Android Studio -

to run application on device think have ensure app. debuggable setting android:debuggable attribute of <application> element true in build.gradle file, (as says in doc. http://developer.android.com/tools/building/building-studio.html) how file looks like:

// top-level build file can add configuration options common sub-projects/modules.  buildscript {     repositories {         jcenter()     }     dependencies {         classpath 'com.android.tools.build:gradle:1.2.3'          // note: not place application dependencies here; belong         // in individual module build.gradle files     } }  allprojects {     repositories {         jcenter()     } } 

you targeting wrong build.gradle (top level). need in lower level build.gradle in android block:

android {      //...      buildtypes {         debug {             debuggable true         }         customdebuggablebuildtype {             debuggable true         }         release {             debuggable false         }     }     //...  } 

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also can done in old way adding android:debuggable="true" androidmanifest.xml file in <application section.