Adding log4j-samples-android project

log4j-samples-android/.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

log4j-samples-android/app/.gitignore

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+/build

log4j-samples-android/app/build.gradle

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+plugins {
+    id 'com.android.application'
+}
+
+android {
+    compileSdk 34
+
+    defaultConfig {
+        applicationId "com.example.log4japi"
+        minSdk 26
+        targetSdk 34
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+    packagingOptions {
+        resources.excludes.add("META-INF/*")
+        resources.excludes.add("serviceAccountKey*.json")
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.11.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.2.1'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.6.1'
+
+    //Log4j
+    implementation 'org.apache.logging.log4j:log4j-api:2.24.1'
+    implementation 'org.apache.logging.log4j:log4j-core:2.24.1'
+}

log4j-samples-android/app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

log4j-samples-android/app/src/androidTest/java/com/example/log4japi/ExampleInstrumentedTest.java

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+package com.example.log4japi;
+
+import android.content.Context;
+
+import androidx.test.platform.app.InstrumentationRegistry;
+import androidx.test.ext.junit.runners.AndroidJUnit4;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+
+import static org.junit.Assert.*;
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * @see <a href="http://d.android.com/tools/testing">Testing documentation</a>
+ */
+@RunWith(AndroidJUnit4.class)
+public class ExampleInstrumentedTest {
+    @Test
+    public void useAppContext() {
+        // Context of the app under test.
+        Context appContext = InstrumentationRegistry.getInstrumentation().getTargetContext();
+        assertEquals("com.example.log4japi", appContext.getPackageName());
+    }
+}

log4j-samples-android/app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    package="com.example.log4japi">
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.Log4jAPI"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

log4j-samples-android/app/src/main/assets/log4j2.properties

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+# Root logger configuration
+status = error
+name = PropertiesConfig
+
+# Appenders
+appender.console.type = Console
+appender.console.name = Console
+appender.console.target = SYSTEM_OUT
+appender.console.layout.type = PatternLayout
+appender.console.layout.pattern = [%d{yyyy-MM-dd HH:mm:ss.SSS}] %-5p- %m%n
+
+# Root logger level and appenders
+rootLogger.level = INFO
+rootLogger.appenderRefs = stdout
+rootLogger.appenderRef.stdout.ref = Console
+
+logger.com.example.log4japi.MainActivity.name = com.example.log4japi.MainActivity
+logger.com.example.log4japi.MainActivity.level = DEBUG
+logger.com.example.log4japi.MainActivity.additivity = false
+logger.com.example.log4japi.MainActivity.appenderRefs = stdout
+logger.com.example.log4japi.MainActivity.appenderRef.stdout.ref = Console

log4j-samples-android/app/src/main/java/com/example/log4japi/MainActivity.java

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+package com.example.log4japi;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
+import android.os.Bundle;
+import android.widget.Button;
+import android.widget.TextView;
+
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.LogManager;
+import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.core.LoggerContext;
+import org.apache.logging.log4j.core.config.ConfigurationFactory;
+import org.apache.logging.log4j.core.config.ConfigurationSource;
+import org.apache.logging.log4j.core.config.Configurator;
+import org.apache.logging.log4j.core.config.LoggerConfig;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.Arrays;
+
+public class MainActivity extends AppCompatActivity {
+
+    private int logLevelIdx;
+
+    //Logger log = LogManager.getLogger(MainActivity.class);
+    Logger log = LogManager.getRootLogger();
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_main);
+
+        /*// Manually read in log4j2.properties
+        LoggerContext context = (LoggerContext) LogManager.getContext(false);
+        try {
+            InputStream inputStream = getAssets().open("log4j2.properties");
+            ConfigurationSource source = new ConfigurationSource(inputStream);
+            context.start(ConfigurationFactory.getInstance().getConfiguration(context, source));
+        } catch (IOException e) {
+            e.printStackTrace();
+        }*/
+
+        /*// Explicitly set the logging level for this logger to INFO
+        //Configurator.setLevel(log, Level.INFO);
+        LoggerConfig loggerConfig = context.getConfiguration().getLoggerConfig(log.getName());
+        loggerConfig.setLevel(Level.INFO);*/
+
+        //
+        // UI bindings
+        //
+        //TextView displaying Log Level
+        TextView logLevelTxt = findViewById(R.id.logLevelTxt);
+        logLevelTxt.setText(log.getLevel().name());
+
+        //Change log level
+        Button setLogLevelBtn = findViewById(R.id.setLogLevelBtn);
+        setLogLevelBtn.setOnClickListener(v -> {
+            AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);
+            alertDialog.setTitle("Set log level");
+
+            String[] logLevels = new String[]{"OFF", "FATAL", "ERROR", "WARN", "INFO", "DEBUG", "TRACE", "ALL"};
+            logLevelIdx = Arrays.asList(logLevels).indexOf(log.getLevel().name());
+
+            alertDialog.setSingleChoiceItems(logLevels, logLevelIdx, (dialog, which) -> logLevelIdx = which);
+            alertDialog.setPositiveButton("Select", (dialog, which) -> {
+                Configurator.setLevel(log, Level.valueOf(Arrays.asList(logLevels).get(logLevelIdx)));
+                logLevelTxt.setText(log.getLevel().name());
+                dialog.dismiss();
+            });
+            alertDialog.setNegativeButton("Cancel", (dialog, which) -> dialog.dismiss());
+            alertDialog.create();
+            alertDialog.show();
+        });
+
+        //Log messages
+        Button fatalLogBtn = findViewById(R.id.fatalLogBtn);
+        fatalLogBtn.setOnClickListener(v -> log.fatal("Current log level is: " + log.getLevel().name()));
+
+        Button errorLogBtn = findViewById(R.id.errorLogBtn);
+        errorLogBtn.setOnClickListener(v -> log.error("Current log level is: " + log.getLevel().name()));
+
+        Button warnLogBtn = findViewById(R.id.warnLogBtn);
+        warnLogBtn.setOnClickListener(v -> log.warn("Current log level is: " + log.getLevel().name()));
+
+        Button infoLogBtn = findViewById(R.id.infoLogBtn);
+        infoLogBtn.setOnClickListener(v -> log.info("Current log level is: " + log.getLevel().name()));
+
+        Button debugLogBtn = findViewById(R.id.debugLogBtn);
+        debugLogBtn.setOnClickListener(v -> log.debug("Current log level is: " + log.getLevel().name()));
+
+        Button traceLogBtn = findViewById(R.id.traceLogBtn);
+        traceLogBtn.setOnClickListener(v -> log.trace("Current log level is: " + log.getLevel().name()));
+    }
+}

log4j-samples-android/app/src/main/res/drawable-v24/ic_launcher_foreground.xml

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+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>