Add safer intents sample

app/build.gradle.kts

@@ -34,7 +34,7 @@ android {
 
     defaultConfig {
         applicationId = "com.example.platform.app"
-        minSdk = 21
+        minSdk = 24
         targetSdk = 34
         versionCode = 1
         versionName = "1.0"

gradle/libs.versions.toml

@@ -18,7 +18,7 @@ accompanist = "0.32.0"
 androidx-datastore = "1.0.0"
 androidx-navigation = "2.7.7"
 androidx-window = "1.2.0"
-agp = "8.2.2"
+agp = "8.4.1"
 casa = "0.5.1"
 coil = "2.4.0"
 ksp = "1.9.22-1.0.17"

gradle/wrapper/gradle-wrapper.properties

@@ -17,6 +17,6 @@
 #Wed Dec 07 13:21:03 CET 2022
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

samples/README.md

@@ -90,6 +90,8 @@ Shows Predictive Back animations.
 Add your custom tile to the Quick Settings.
 - [Receive data shared by other apps](user-interface/share/src/main/java/com/example/platform/ui/share/receiver/ShareReceiverActivity.kt):
 Receive texts and images from other apps.
+- [SaferIntents](security/intents/src/main/java/com/example/platform/security/intents/SaferIntents.kt):
+Example on how can fix the miss use of intents
 - [Scan with BLE Intent](connectivity/bluetooth/ble/src/main/java/com/example/platform/connectivity/bluetooth/ble/BLEScanIntentSample.kt):
 This samples shows how to use the BLE intent to scan for devices
 - [Screenshot Detection](privacy/transparency/src/main/java/com/example/platform/privacy/transparency/ScreenshotDetection.kt):

samples/security/intents/README.md

@@ -0,0 +1,10 @@
+# SaferIntents samples
+
+This sample shows that it is important to not have a NULL intent.
+It contains 2 buttons:
+
+- One button sends an NULL intent
+- Another button sends a regular intent
+
+It is important to note that for the NULL intent an exception handling has taken place.
+If an app sends a NULL intent it will crash with an `ActivityNotFound` exception

samples/security/intents/build.gradle.kts

@@ -0,0 +1,29 @@
+
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+plugins {
+    id("com.example.platform.sample")
+}
+
+android {
+    namespace = "com.example.platform.security.intents"
+}
+
+dependencies {
+    // Add samples specific dependencies
+}

samples/security/intents/src/main/AndroidManifest.xml

@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+  ~ Copyright 2023 The Android Open Source Project
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     https://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application>
+        <activity android:name=".SaferIntentsActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="com.example.platform.security.intents.MY_ACTION" />
+                <category android:name="android.intent.category.DEFAULT" />
+            </intent-filter>
+        </activity>
+    </application>
+</manifest>

samples/security/intents/src/main/java/com/example/platform/security/intents/SaferIntents.kt

@@ -0,0 +1,72 @@
+
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package com.example.platform.security.intents
+
+import android.annotation.SuppressLint
+import android.content.ActivityNotFoundException
+import android.content.Intent
+import android.widget.Toast
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.Button
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.LocalContext
+import androidx.compose.ui.unit.dp
+import com.google.android.catalog.framework.annotations.Sample
+
+@Sample(
+    name = "SaferIntents",
+    description = "Example on how can fix the miss use of intents"
+)
+@SuppressLint("IntentWithNullActionLaunch")
+@Composable
+fun SaferIntents() {
+    val context = LocalContext.current
+
+    Column (
+        modifier = Modifier
+            .fillMaxSize()
+            .padding(16.dp),
+        verticalArrangement = Arrangement.spacedBy(8.dp),
+        horizontalAlignment = Alignment.CenterHorizontally,
+    ){
+        Button(onClick = {
+            val intent = Intent()
+            try {
+                context.startActivity(intent)
+            } catch (e : ActivityNotFoundException) {
+                Toast.makeText(context, "Error: " + e.message, Toast.LENGTH_SHORT).show()
+            }
+        }) {
+            Text(text = "Send NULL Intent")
+        }
+
+        Button(onClick = {
+            val intent = Intent("com.example.platform.security.intents.MY_ACTION")
+            context.startActivity(intent)
+        }) {
+            Text(text = "Send Intent")
+        }
+    }
+}

samples/security/intents/src/main/java/com/example/platform/security/intents/SaferIntentsActivity.kt

@@ -0,0 +1,56 @@
+
+/*
+ * Copyright 2024 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.example.platform.security.intents
+
+import android.content.BroadcastReceiver
+import android.content.Context
+import android.content.Intent
+import android.os.Bundle
+import android.util.Log
+import android.widget.Toast
+import androidx.activity.ComponentActivity
+import androidx.activity.compose.setContent
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Surface
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+
+class SaferIntentsActivity : ComponentActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        Toast.makeText(applicationContext, "Activity successfully created", Toast.LENGTH_SHORT).show()
+
+        setContent {
+            MaterialTheme {
+                Surface (
+                    Modifier
+                        .fillMaxSize()
+                        .background(MaterialTheme.colorScheme.background)
+                ){
+                   HelloAndroidScreen()
+                }
+            }
+        }
+    }
+}
+@Composable
+fun HelloAndroidScreen() {
+   Text(text = "Hello Android!")
+}