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Initial commit: Silent Block v0.1.0
Tiny Android app that silently rejects incoming calls per SIM via CallScreeningService. Three modes: Off / Unknown / All. Master toggle overrides per-SIM rules. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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‎.gitignore‎

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*.iml
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.gradle/
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local.properties
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.idea/
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.DS_Store
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build/
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captures/
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.externalNativeBuild
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.cxx
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*.apk
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*.aab
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*.keystore
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*.jks

‎README.md‎

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# Silent Block
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Tiny Android app that silently rejects incoming calls. No ringing, no missed-call notification — calls are dropped before the dialer reacts.
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## Features
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- **Master switch** — one toggle to block every incoming call across all SIMs.
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- **Per-SIM rules** — independent mode for each SIM:
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- **Off** — let calls ring normally.
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- **Unknown** — block calls from numbers not in your Contacts.
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- **All** — block every call to this SIM.
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- Uses Android's `CallScreeningService` (API 29+) — clean, modern, no reflection.
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## Install
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Download the APK from the [latest release](https://github.com/redblack168/silent-call-blocker/releases) and install it on your phone (enable *Install unknown apps* for your browser/file manager).
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After install:
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1. Open **Silent Block**.
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2. Tap **Set as screener** → grant the Call Screening role.
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3. Tap **Grant permissions** → Contacts + Phone.
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4. Adjust per-SIM rules as desired.
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## Build from source
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```bash
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JAVA_HOME=/path/to/jdk17 ./gradlew :app:assembleDebug
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# APK at app/build/outputs/apk/debug/app-debug.apk
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```
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Requires Android SDK 34, build-tools 34.0.0, JDK 17. Min device: Android 10 (API 29).

‎app/build.gradle.kts‎

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plugins {
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id("com.android.application")
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id("org.jetbrains.kotlin.android")
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}
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android {
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namespace = "com.cola.callblock"
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compileSdk = 34
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defaultConfig {
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applicationId = "com.cola.callblock"
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minSdk = 29
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targetSdk = 34
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versionCode = 1
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versionName = "0.1.0"
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vectorDrawables { useSupportLibrary = true }
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}
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buildTypes {
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debug {
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isMinifyEnabled = false
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isDebuggable = true
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}
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release {
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isMinifyEnabled = false
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signingConfig = signingConfigs.getByName("debug")
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}
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}
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compileOptions {
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sourceCompatibility = JavaVersion.VERSION_17
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targetCompatibility = JavaVersion.VERSION_17
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}
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kotlinOptions {
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jvmTarget = "17"
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freeCompilerArgs += listOf(
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"-opt-in=androidx.compose.material3.ExperimentalMaterial3Api",
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)
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}
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buildFeatures {
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compose = true
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}
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composeOptions {
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kotlinCompilerExtensionVersion = "1.5.10"
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}
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sourceSets {
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getByName("main") {
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java.srcDirs("src/main/kotlin")
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}
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}
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packaging {
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resources {
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excludes += "/META-INF/{AL2.0,LGPL2.1}"
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}
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}
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}
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dependencies {
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val composeBom = platform("androidx.compose:compose-bom:2024.04.01")
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implementation(composeBom)
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implementation("androidx.core:core-ktx:1.12.0")
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implementation("androidx.appcompat:appcompat:1.6.1")
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implementation("androidx.activity:activity-compose:1.8.2")
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implementation("androidx.lifecycle:lifecycle-runtime-ktx:2.7.0")
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implementation("androidx.lifecycle:lifecycle-runtime-compose:2.7.0")
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implementation("androidx.compose.ui:ui")
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implementation("androidx.compose.ui:ui-graphics")
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implementation("androidx.compose.material3:material3")
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implementation("androidx.datastore:datastore-preferences:1.1.1")
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implementation("org.jetbrains.kotlinx:kotlinx-coroutines-android:1.8.0")
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debugImplementation("androidx.compose.ui:ui-tooling")
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}

‎app/proguard-rules.pro‎

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# Default rules — release isn't minified, this file exists only to satisfy AGP.

‎app/src/main/AndroidManifest.xml‎

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<?xml version="1.0" encoding="utf-8"?>
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<manifest xmlns:android="http://schemas.android.com/apk/res/android">
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<uses-permission android:name="android.permission.READ_CONTACTS" />
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<uses-permission android:name="android.permission.READ_PHONE_STATE" />
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<uses-permission android:name="android.permission.READ_PHONE_NUMBERS" />
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<application
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android:name=".BlockerApp"
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android:allowBackup="false"
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android:icon="@mipmap/ic_launcher"
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android:label="@string/app_name"
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android:supportsRtl="true"
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android:theme="@style/Theme.CallBlocker">
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<activity
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android:name=".MainActivity"
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android:exported="true"
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android:launchMode="singleTask">
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<intent-filter>
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<action android:name="android.intent.action.MAIN" />
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<category android:name="android.intent.category.LAUNCHER" />
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</intent-filter>
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</activity>
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<service
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android:name=".ScreenerService"
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android:exported="true"
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android:permission="android.permission.BIND_SCREENING_SERVICE">
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<intent-filter>
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<action android:name="android.telecom.CallScreeningService" />
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</intent-filter>
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</service>
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</application>
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</manifest>

‎app/src/main/kotlin/com/cola/callblock/BlockerApp.kt‎

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package com.cola.callblock
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import android.app.Application
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class BlockerApp : Application()

‎app/src/main/kotlin/com/cola/callblock/ContactLookup.kt‎

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package com.cola.callblock
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import android.Manifest
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import android.content.Context
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import android.content.pm.PackageManager
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import android.net.Uri
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import android.provider.ContactsContract
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import androidx.core.content.ContextCompat
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object ContactLookup {
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fun isContact(ctx: Context, number: String?): Boolean {
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if (number.isNullOrBlank()) return false
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val granted = ContextCompat.checkSelfPermission(
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ctx, Manifest.permission.READ_CONTACTS
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) == PackageManager.PERMISSION_GRANTED
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if (!granted) return false
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val uri = Uri.withAppendedPath(
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ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
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Uri.encode(number)
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)
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return runCatching {
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ctx.contentResolver.query(
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uri,
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arrayOf(ContactsContract.PhoneLookup._ID),
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null, null, null
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)?.use { it.moveToFirst() } ?: false
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}.getOrDefault(false)
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}
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}

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