feat: Add SHAREit-style Home screen and H.264 screen capture sender

app/build.gradle

@@ -33,6 +33,9 @@ dependencies {
     implementation 'androidx.core:core:1.6.0'
     implementation 'org.java-websocket:Java-WebSocket:1.5.4'
     implementation 'com.google.zxing:core:3.3.3'
+    implementation('com.journeyapps:zxing-android-embedded:3.6.0') {
+        exclude group: 'com.android.support'
+    }
 
     testImplementation 'junit:junit:4.13.2'
 }

app/src/main/AndroidManifest.xml

@@ -5,13 +5,22 @@
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
     <uses-permission android:name="android.permission.WAKE_LOCK" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE" />
+    <uses-permission android:name="android.permission.FOREGROUND_SERVICE_MEDIA_PROJECTION" />
+    <uses-permission android:name="android.permission.CAMERA" />
 
     <uses-feature
         android:name="android.hardware.touchscreen"
         android:required="false" />
     <uses-feature
         android:name="android.software.leanback"
         android:required="false" />
+    <uses-feature
+        android:name="android.hardware.camera"
+        android:required="false" />
+    <uses-feature
+        android:name="android.hardware.camera.autofocus"
+        android:required="false" />
 
     <application
         android:allowBackup="true"
@@ -20,7 +29,7 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.LibreCast">
         <activity
-            android:name=".MainActivity"
+            android:name=".HomeActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -29,9 +38,22 @@
             </intent-filter>
         </activity>
 
+        <activity
+            android:name=".MainActivity"
+            android:exported="false" />
+
+        <activity
+            android:name=".SenderActivity"
+            android:exported="false" />
+
         <service
             android:name=".ReceiverService"
             android:exported="false" />
+
+        <service
+            android:name=".ScreenCaptureService"
+            android:exported="false"
+            android:foregroundServiceType="mediaProjection" />
     </application>
 
 </manifest>

app/src/main/java/com/m5dev/librecast/HomeActivity.java

@@ -0,0 +1,35 @@
+package com.m5dev.librecast;
+
+import android.content.Intent;
+import android.os.Bundle;
+import android.view.View;
+import android.widget.Button;
+import androidx.appcompat.app.AppCompatActivity;
+
+public class HomeActivity extends AppCompatActivity {
+
+    @Override
+    protected void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.activity_home);
+
+        Button btnReceive = findViewById(R.id.btn_receive);
+        Button btnSend = findViewById(R.id.btn_send);
+
+        btnReceive.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(HomeActivity.this, MainActivity.class);
+                startActivity(intent);
+            }
+        });
+
+        btnSend.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                Intent intent = new Intent(HomeActivity.this, SenderActivity.class);
+                startActivity(intent);
+            }
+        });
+    }
+}

app/src/main/java/com/m5dev/librecast/LibreCastClient.java

@@ -0,0 +1,96 @@
+package com.m5dev.librecast;
+
+import android.util.Log;
+import org.java_websocket.client.WebSocketClient;
+import org.java_websocket.handshake.ServerHandshake;
+
+import java.net.URI;
+
+public class LibreCastClient extends WebSocketClient {
+
+    private static final String TAG = "LibreCastClient";
+
+    public interface ClientListener {
+        void onConnected();
+        void onDisconnected();
+        void onError(Exception ex);
+    }
+
+    private ClientListener listener;
+
+    public LibreCastClient(URI serverUri) {
+        super(serverUri);
+    }
+
+    public LibreCastClient(URI serverUri, ClientListener listener) {
+        super(serverUri);
+        this.listener = listener;
+    }
+
+    public void setListener(ClientListener listener) {
+        this.listener = listener;
+    }
+
+    @Override
+    public void onOpen(ServerHandshake handshakedata) {
+        logI(TAG, "WebSocket connected to " + getURI());
+        if (listener != null) {
+            listener.onConnected();
+        }
+    }
+
+    @Override
+    public void onMessage(String message) {
+        logD(TAG, "Received message: " + message);
+    }
+
+    @Override
+    public void onClose(int code, String reason, boolean remote) {
+        logI(TAG, "WebSocket closed: " + reason + " (code: " + code + ")");
+        if (listener != null) {
+            listener.onDisconnected();
+        }
+    }
+
+    @Override
+    public void onError(Exception ex) {
+        logE(TAG, "WebSocket error", ex);
+        if (listener != null) {
+            listener.onError(ex);
+        }
+    }
+
+    public void sendFrame(byte[] data) {
+        if (isOpen() && data != null && data.length > 0) {
+            try {
+                send(data);
+            } catch (Exception e) {
+                logE(TAG, "Error sending frame over WebSocket", e);
+            }
+        }
+    }
+
+    private static void logI(String tag, String msg) {
+        try {
+            Log.i(tag, msg);
+        } catch (Throwable t) {
+            System.out.println("[" + tag + "] " + msg);
+        }
+    }
+
+    private static void logD(String tag, String msg) {
+        try {
+            Log.d(tag, msg);
+        } catch (Throwable t) {
+            System.out.println("[" + tag + "] " + msg);
+        }
+    }
+
+    private static void logE(String tag, String msg, Throwable t) {
+        try {
+            Log.e(tag, msg, t);
+        } catch (Throwable ignored) {
+            System.err.println("[" + tag + "] " + msg);
+        }
+    }
+}