all: Upgrade Android plugin to 4.2.0

- bump android plugin version to 4.2.0
- migrate deprecated android.support dependencies to androidx dependencies
- bump `targetSdkVersion` to 29
- temporarily ignore lint error for 'MissingClass' due to grpc#8799
- run android CIs with `-Pandroid.useAndroidX=true -Pandroid.enableJetifier=true` flags
- android examples are still using android.support dependencies, will not be updated in this PR.

Author: dapengzhang0

COMPILING.md

@@ -15,6 +15,7 @@ Some parts of grpc-java depend on Android. Since many Java developers don't have
 the Android SDK installed and don't need to run or modify the Android
 components, the build can skip it. To skip, create the file
 `<project-root>/gradle.properties` and add `skipAndroid=true`.
+Otherwise, create the file `<project-root>/gradle.properties` and add `android.useAndroidX=true`.
 
 Then, to build, run:
 ```

android-interop-testing/build.gradle

@@ -29,12 +29,12 @@ android {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     }
-    compileSdkVersion 26
+    compileSdkVersion 29
 
     defaultConfig {
         applicationId "io.grpc.android.integrationtest"
         minSdkVersion 19
-        targetSdkVersion 26
+        targetSdkVersion 29
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -47,14 +47,17 @@ android {
             proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
         }
     }
-    lintOptions { disable 'InvalidPackage', 'HardcodedText' }
+    lintOptions {
+        disable 'InvalidPackage', 'HardcodedText',
+                'MissingClass' // https://github.com/grpc/grpc-java/issues/8799
+    }
 }
 
 dependencies {
-    implementation 'com.android.support:appcompat-v7:26.1.0'
-    implementation 'com.android.support:multidex:1.0.3'
-    implementation 'com.android.support:support-annotations:26.1.0'
-    implementation 'com.google.android.gms:play-services-base:16.1.0'
+    implementation 'androidx.appcompat:appcompat:1.3.0'
+    implementation 'androidx.multidex:multidex:2.0.0'
+    implementation libraries.androidx_annotation
+    implementation 'com.google.android.gms:play-services-base:18.0.1'
 
     implementation project(':grpc-auth'),
             project(':grpc-census'),

android-interop-testing/src/main/AndroidManifest.xml

@@ -9,7 +9,7 @@
         android:icon="@mipmap/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/Base.V7.Theme.AppCompat.Light"
-        android:name="android.support.multidex.MultiDexApplication" >
+        android:name="androidx.multidex.MultiDexApplication" >
         <activity
             android:name=".TesterActivity"
             android:label="@string/app_name" >

android-interop-testing/src/main/java/io/grpc/android/integrationtest/TesterActivity.java

@@ -19,7 +19,6 @@
 import android.content.Context;
 import android.content.Intent;
 import android.os.Bundle;
-import android.support.v7.app.AppCompatActivity;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
@@ -28,6 +27,7 @@
 import android.widget.CheckBox;
 import android.widget.EditText;
 import android.widget.TextView;
+import androidx.appcompat.app.AppCompatActivity;
 import com.google.android.gms.security.ProviderInstaller;
 import io.grpc.ManagedChannel;
 import java.io.InputStream;

android-interop-testing/src/main/java/io/grpc/android/integrationtest/TesterOkHttpChannelBuilder.java

@@ -16,7 +16,7 @@
 
 package io.grpc.android.integrationtest;
 
-import android.support.annotation.Nullable;
+import androidx.annotation.Nullable;
 import io.grpc.ChannelCredentials;
 import io.grpc.Grpc;
 import io.grpc.InsecureChannelCredentials;

buildscripts/kokoro/android-interop.sh

@@ -21,10 +21,12 @@ echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
 # Proto deps
 buildscripts/make_dependencies.sh
 
+GRADLE_FLAGS="-Pandroid.useAndroidX=true"
+
 # Build and run interop instrumentation tests on Firebase Test Lab
 cd android-interop-testing
-../gradlew assembleDebug
-../gradlew assembleDebugAndroidTest
+../gradlew assembleDebug $GRADLE_FLAGS
+../gradlew assembleDebugAndroidTest $GRADLE_FLAGS
 gcloud firebase test android run \
   --type instrumentation \
   --app build/outputs/apk/debug/grpc-android-interop-testing-debug.apk \
@@ -41,7 +43,7 @@ gcloud firebase test android run \
 
 # Build and run binderchannel instrumentation tests on Firebase Test Lab
 cd ../binder
-../gradlew assembleDebugAndroidTest
+../gradlew assembleDebugAndroidTest $GRADLE_FLAGS
 gcloud firebase test android run \
   --type instrumentation \
   --app ../android-interop-testing/build/outputs/apk/debug/grpc-android-interop-testing-debug.apk \

buildscripts/kokoro/android.sh

@@ -28,13 +28,16 @@ echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
 # Proto deps
 buildscripts/make_dependencies.sh
 
+GRADLE_FLAGS="-Pandroid.useAndroidX=true"
+
 ./gradlew \
     :grpc-android-interop-testing:build \
     :grpc-android:build \
     :grpc-cronet:build \
     :grpc-binder:build \
     assembleAndroidTest \
-    publishToMavenLocal
+    publishToMavenLocal \
+    $GRADLE_FLAGS
 
 if [[ ! -z $(git status --porcelain) ]]; then
   git status
@@ -89,7 +92,7 @@ cd $BASE_DIR/github/grpc-java
 ./gradlew clean
 git checkout HEAD^
 ./gradlew --stop  # use a new daemon to build the previous commit
-./gradlew publishToMavenLocal
+./gradlew publishToMavenLocal $GRADLE_FLAGS
 cd examples/android/helloworld/
 ../../gradlew build
 

buildscripts/kokoro/linux_artifacts.sh

@@ -14,25 +14,29 @@ readonly GRPC_JAVA_DIR="$(cd "$(dirname "$0")"/../.. && pwd)"
 # use --include-build for its grpc-core dependency
 echo y | ${ANDROID_HOME}/tools/bin/sdkmanager "build-tools;28.0.3"
 LOCAL_MVN_TEMP=$(mktemp -d)
+GRADLE_FLAGS="-Pandroid.useAndroidX=true"
 pushd "$GRPC_JAVA_DIR/android"
 ../gradlew publish \
   -Dorg.gradle.parallel=false \
   -PskipCodegen=true \
-  -PrepositoryDir="$LOCAL_MVN_TEMP"
+  -PrepositoryDir="$LOCAL_MVN_TEMP" \
+  $GRADLE_FLAGS
 popd
 
 pushd "$GRPC_JAVA_DIR/cronet"
 ../gradlew publish \
   -Dorg.gradle.parallel=false \
   -PskipCodegen=true \
-  -PrepositoryDir="$LOCAL_MVN_TEMP"
+  -PrepositoryDir="$LOCAL_MVN_TEMP" \
+  $GRADLE_FLAGS
 popd
 
 pushd "$GRPC_JAVA_DIR/binder"
 ../gradlew publish \
   -Dorg.gradle.parallel=false \
   -PskipCodegen=true \
-  -PrepositoryDir="$LOCAL_MVN_TEMP"
+  -PrepositoryDir="$LOCAL_MVN_TEMP" \
+  $GRADLE_FLAGS
 popd
 
 readonly MVN_ARTIFACT_DIR="${MVN_ARTIFACT_DIR:-$GRPC_JAVA_DIR/mvn-artifacts}"

settings.gradle

@@ -1,7 +1,7 @@
 pluginManagement {
     plugins {
-        id "com.android.application" version "3.5.0"
-        id "com.android.library" version "3.5.0"
+        id "com.android.application" version "4.2.0"
+        id "com.android.library" version "4.2.0"
         id "com.github.johnrengelman.shadow" version "6.1.0"
         id "com.github.kt3k.coveralls" version "2.10.2"
         id "com.google.osdetector" version "1.6.2"