feat(Application.java): Load Dreamland

在 attach 方法中加入dreamland 框架注入逻辑

core/java/android/app/Application.java

@@ -29,7 +29,12 @@ import android.content.res.Configuration;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.autofill.AutofillManager;
-
+import java.io.File;
+import dalvik.system.DexClassLoader;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+import java.lang.reflect.Method;
+import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.ArrayList;
 
 /**
@@ -346,12 +351,63 @@ public class Application extends ContextWrapper implements ComponentCallbacks2 {
     /**
      * @hide
      */
+
+    private static AtomicBoolean hasInited = new AtomicBoolean(false);
+    private static final TAG = "LOAD_DREAMLAND";
+
     @UnsupportedAppUsage
     /* package */ final void attach(Context context) {
+        if (hasInited.compareAndSet(false, true)) {
+            Log.i(TAG, "attach: " + context.getPackageName());
+            PackageInfo runtimePkg = findDreamlandApkFromInstalled(context);
+            if (runtimePkg == null){
+                    Log.w(TAG, "未找到 dreamland 运行时apk，请安装!");
+            }else{
+                    String targetPackageSourceDir = runtimePkg.applicationInfo.publicSourceDir;
+                    String nativeLibraryDir = runtimePkg.applicationInfo.nativeLibraryDir;
+                    Log.i(TAG, "load apk path: " + targetPackageSourceDir);
+                    Log.i(TAG, "load native path: " + nativeLibraryDir);
+                    String dexDir = dexDir(context).getAbsolutePath();
+                    try {
+                            ClassLoader classLoader = new DexClassLoader(targetPackageSourceDir, dexDir, nativeLibraryDir, context.getClassLoader());
+                            Class<?> runtimeClass = classLoader.loadClass("com.dreamland.runtime.DreamlandRuntime");
+                            Method method = runtimeClass.getDeclaredMethod("callApplicationAttach", Context.class);
+                            method.invoke(null, context);
+                            Log.i(TAG, "加载 runtime 成功");
+                    }catch(Exception e){
+                            Log.e(TAG, "加载模块发生异常", e);
+                    }
+            }
+    }
         attachBaseContext(context);
         mLoadedApk = ContextImpl.getImpl(context).mPackageInfo;
     }
 
+    private static PackageInfo findDreamlandApkFromInstalled(Context context) {
+        PackageManager packageManager = context.getPackageManager();
+        if (packageManager == null){
+            Log.w(TAG, "packageManager 为 null");
+            return null;
+        }
+        for (PackageInfo pkg : packageManager.getInstalledPackages(PackageManager.GET_META_DATA)) {
+            if ("com.dreamland.runtime".equals(pkg.packageName))
+                return pkg;
+        }
+        return null;
+    }
+
+    private static File dexDir(Context context) {
+        return makeSureDirExist(new File(makeSureDirExist(context.getDir("dreamland_resource", Context.MODE_PRIVATE)), "dreamland_runtime_dex"));
+    }
+
+    private static File makeSureDirExist(File file) {
+        if (file.exists() && file.isFile()) {
+            return file;
+        }
+        file.mkdirs();
+        return file;
+    }
+
     @UnsupportedAppUsage
         /* package */ void dispatchActivityPreCreated(@NonNull Activity activity,
             @Nullable Bundle savedInstanceState) {