[Change]

开始USB摄像头的功能集成，还无法获取usb连接广播需要调试

Signed-off-by: donghongyu <donghongyu@zhidaoauto.com>

libraries/map-usbcamera/src/main/java/com/serenegiant/utils/AssetsHelper.java

@@ -0,0 +1,24 @@
+package com.serenegiant.utils;
+
+import android.content.res.AssetManager;
+
+import androidx.annotation.NonNull;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStreamReader;
+
+public class AssetsHelper {
+
+	public static String loadString(@NonNull final AssetManager assets, @NonNull final String name) throws IOException {
+		final StringBuffer sb = new StringBuffer();
+		final char[] buf = new char[1024];
+		final BufferedReader reader = new BufferedReader(new InputStreamReader(assets.open(name)));
+		int r = reader.read(buf);
+		while (r > 0) {
+			sb.append(buf, 0, r);
+			r = reader.read(buf);
+		}
+		return sb.toString();
+	}
+}