[Android] Support PP-OCRv2 & PP-OCRv3 in Android (#445)

* [Android] Add Android build docs and demo (#26)

* [Backend] Add override flag to lite backend

* [Docs] Add Android C++ SDK build docs

* [Doc] fix android_build_docs typos

* Update CMakeLists.txt

* Update android.md

* [Doc] Add PicoDet Android demo docs

* [Doc] Update PicoDet Andorid demo docs

* [Doc] Update PaddleClasModel Android demo docs

* [Doc] Update fastdeploy android jni docs

* [Doc] Update fastdeploy android jni usage docs

* [Android] init fastdeploy android jar package

* [Backend] support int8 option for lite backend

* [Model] add Backend::Lite to paddle model

* [Backend] use CopyFromCpu for lite backend.

* [Android] package jni srcs and java api into aar

* Update infer.cc

* Update infer.cc

* [Android] Update package build.gradle

* [Android] Update android app examples

* [Android] update android detection app

* [Android] Support PP-OCRv2 & PP-OCRv3 in Android

* [Android] bind ORCResult with JNI

* [Android] move static class jni method to instance method

* [Android] bind VisOcr and VisClassification via JNI

* [Android] Add PP-OCRv2 & v3 android demo

Author: DefTruth

java/android/app/src/main/AndroidManifest.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
-    package="com.baidu.paddle.fastdeploy.app.examples.detection">
+    package="com.baidu.paddle.fastdeploy.app.examples">
 
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
@@ -11,18 +11,18 @@
     <application
         android:allowBackup="true"
         android:icon="@mipmap/ic_launcher"
-        android:label="@string/app_name"
+        android:label="@string/ocr_app_name"
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme">
-        <activity android:name="com.baidu.paddle.fastdeploy.app.examples.detection.MainActivity">
+        <activity android:name="com.baidu.paddle.fastdeploy.app.examples.ocr.MainActivity">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
         </activity>
         <activity
-            android:name="com.baidu.paddle.fastdeploy.app.examples.detection.SettingsActivity"
+            android:name="com.baidu.paddle.fastdeploy.app.examples.ocr.SettingsActivity"
             android:label="Settings">
         </activity>
     </application>

java/android/app/src/main/assets/labels/en_dict.txt

@@ -0,0 +1,94 @@
+0
+1
+2
+3
+4
+5
+6
+7
+8
+9
+:
+;
+<
+=
+>
+?
+@
+A
+B
+C
+D
+E
+F
+G
+H
+I
+J
+K
+L
+M
+N
+O
+P
+Q
+R
+S
+T
+U
+V
+W
+X
+Y
+Z
+[
+\
+]
+^
+_
+`
+a
+b
+c
+d
+e
+f
+g
+h
+i
+j
+k
+l
+m
+n
+o
+p
+q
+r
+s
+t
+u
+v
+w
+x
+y
+z
+{
+|
+}
+~
+!
+"
+#
+$
+%
+&
+'
+(
+)
+*
++
+,
+-
+.
+/