Merge pull request #3267 from deltachat/adb/issue-3144

add monochrome launcher icon

src/main/res/drawable/ic_launcher_foreground_monochrome.xml

@@ -0,0 +1,15 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="44"
+    android:viewportHeight="44">
+  <group android:scaleX="0.43"
+      android:scaleY="0.43"
+      android:translateX="13.2"
+      android:translateY="13.2">
+    <path
+        android:pathData="M22,0.002C9.852,0.149 0,10.127 0,22.275 0,34.423 9.852,44.146 22,43.998 34.851,41.825 30.778,38.561 43.633,43.485 36.973,31.766 43.857,30.986 44,21.725 44,9.577 34.148,-0.146 22,0.002ZM21.853,4.515c2.535,0 4.766,0.33 6.648,1.027 1.247,0.457 2.032,1.04 2.461,1.725 0.008,0.006 0.029,-0.006 0.037,0 0.736,0.564 1.102,1.217 1.102,1.982 -0,0.589 -0.237,1.08 -0.698,1.468 -0.461,0.387 -0.965,0.55 -1.579,0.55 -0.883,0 -1.931,-0.509 -3.122,-1.578C25.491,8.604 24.461,7.848 23.616,7.414 22.79,6.965 21.828,6.717 20.715,6.717c-1.421,0 -2.604,0.259 -3.526,0.771 -0.903,0.511 -1.359,1.155 -1.359,1.945 -0,0.534 0.234,1.019 0.624,1.504 0.865,0.678 2.652,1.796 5.509,3.376 3.322,1.844 5.688,3.255 7.052,4.293 0.648,0.487 1.229,1.029 1.763,1.615 0.036,0.039 0.075,0.071 0.11,0.11 0.013,0.012 0.024,0.025 0.037,0.037 0.865,0.826 1.591,1.771 2.204,2.825 0.864,1.487 1.322,3.076 1.322,4.734 -0,2.913 -1.303,5.475 -3.856,7.706 -2.535,2.216 -5.489,3.339 -8.888,3.339 -3.092,-0 -5.692,-0.897 -7.823,-2.679 -0.382,-0.32 -0.715,-0.668 -1.028,-1.027 -1.962,-1.756 -2.938,-4.045 -2.938,-6.899 -0,-2.866 1.146,-5.271 3.489,-7.192 2.318,-1.886 5.167,-3.026 8.521,-3.449 -0.846,-0.699 -1.807,-1.471 -3.048,-2.348 -1.825,-1.292 -3.041,-2.328 -3.71,-3.082 -0.024,-0.022 -0.05,-0.052 -0.073,-0.073 -0.31,-0.282 -0.574,-0.541 -0.771,-0.771 -0.653,-0.775 -0.992,-1.618 -0.992,-2.532 -0,-1.363 0.776,-2.454 2.351,-3.229 1.575,-0.79 3.636,-1.174 6.17,-1.174zM24.167,19.56c-5.511,0.728 -8.264,3.761 -8.264,9.137 -0,2.618 0.587,4.688 1.8,6.201 0.013,0.012 0.024,0.025 0.037,0.037 1.249,1.151 2.644,1.761 4.224,1.761 1.901,0 3.472,-0.766 4.701,-2.238 1.229,-1.487 1.836,-3.492 1.836,-6.018 -0,-2.979 -1.148,-5.66 -3.416,-8.073 -0.293,-0.273 -0.594,-0.542 -0.918,-0.807z"
+        android:fillColor="#ffffff"
+        android:strokeColor="#00000000"/>
+  </group>
+</vector>

src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -2,4 +2,5 @@
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
     <background android:drawable="@color/ic_launcher_background"/>
     <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
-</adaptive-icon>
+    <monochrome android:drawable="@drawable/ic_launcher_foreground_monochrome"/>
+</adaptive-icon>