adding strict mode to app sample

sentry-sample/src/main/java/io/sentry/sample/MainActivity.java

@@ -1,6 +1,7 @@
 package io.sentry.sample;
 
 import android.os.Bundle;
+import android.os.StrictMode;
 import androidx.appcompat.app.AppCompatActivity;
 import io.sentry.core.Sentry;
 import timber.log.Timber;
@@ -9,6 +10,9 @@ public class MainActivity extends AppCompatActivity {
 
   @Override
   protected void onCreate(Bundle savedInstanceState) {
+    // ideally Application class
+    districtMode();
+
     super.onCreate(savedInstanceState);
     setContentView(R.layout.activity_main);
 
@@ -34,4 +38,17 @@ protected void onCreate(Bundle savedInstanceState) {
               Sentry.captureException(new Exception("Some exception."));
             });
   }
+
+  private void districtMode() {
+    //    https://developer.android.com/reference/android/os/StrictMode
+    //    StrictMode is a developer tool which detects things you might be doing by accident and
+    // brings them to your attention so you can fix them.
+
+    if (BuildConfig.DEBUG) {
+      StrictMode.setThreadPolicy(
+          new StrictMode.ThreadPolicy.Builder().detectAll().penaltyLog().build());
+
+      StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll().penaltyLog().build());
+    }
+  }
 }