AudioRecord: AudioFlinger could not create record track, status: -1
         E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -1.
         E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
         W/System.err: java.lang.Exception: AudioRecord init failed
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:102)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at android.view.View.performClick(View.java:5697)
         W/System.err:     at android.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at android.os.Looper.loop(Looper.java:158)
         W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
         W/System.err: java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
         W/System.err:     at android.media.AudioRecord.startRecording(AudioRecord.java:943)
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:114)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at android.view.View.performClick(View.java:5697)
         W/System.err:     at android.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at android.os.Looper.loop(Looper.java:158)
         W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)