为cocos2d-x实现安卓输入框。非全屏，无dialog，绑定到lua

cocos2d-x官方自带的输入框，简直惨不忍睹，在ios还好，在安卓简直了。。用过的都知道。。。

所以为了用户体验，我们自己搞一个吧。输入框这种东西比较特殊，不像按钮、列表框之类的很容易实现，因为涉及到复制粘贴、操作虚拟键盘等，所以当然是用安卓原生的输入框最好了。

非常感谢我们的主程陈剑大哥，思路是陈剑大哥想的，我只负责记录一下。

本来代码50天前就写好了，但是绑定到js一直失败，恶心了好几天放弃了。前几天在用lua写点东西，把之前的代码拷过来试着绑定到lua，结果一次就成功了，完全没有踩坑，不知道说什么好了。。而且前几天官方发布了cocos2d-x 3.8版本，已经自带了，所以现在再发出来感觉毫无竞争力了呢。。。

使用原生控件的优点不用多说了，缺点当然也是有的。例如排版、布局、屏幕适配等，都要适应cocos2d的规则，而且由于是系统控件，渲染层级不受cocos2d的zorder的影响。当然这些努力一下也是可以解决的。

要注意的有：

1、c++通过jni控制java创建安卓控件。

2、c++持有java对象的引用，防止垃圾回收。

3、java回调c语言，c语言调用c++，所以需要处理好java对象与c++对象的对应关系。

我的做法是：

1、创建一个输入框工厂类，负责根据不同平台生成输入框，当然我只会安卓的。

2、工厂类维护一个map，保存c++对象和java对象的对应关系。

3、根据cocos2d的世界坐标系，更新安卓原生控件。

防止恶意转载还改名的恶心行为。本博客地址：http://www.cnblogs.com/wolfred7464/

上代码吧：

 #ifndef __CocosAndroidStudio__EditText__
 #define __CocosAndroidStudio__EditText__

 #include <string>
 #include "cocos2d.h"

 class EditText : public cocos2d::Node {
 public:
     virtual ~EditText() {};
     virtual void setString(const std::string& str) = ;
     virtual std::string getString() = ;

 protected:

 };

 #endif /* defined(__CocosAndroidStudio__EditText__) */

EditText.h

 #ifndef __CocosAndroidStudio__EditTextAndroid__
 #define __CocosAndroidStudio__EditTextAndroid__

 #include "EditText.h"
 #include "platform/android/jni/JniHelper.h"
 #include "EditTextFactory.h"

 class EditTextAndroid : public EditText {
 public:
     ~EditTextAndroid();

     virtual void setString(const std::string& str) override;
     virtual std::string getString() override;

     virtual void setPosition(const cocos2d::Vec2& pos) override;
     virtual void setContentSize(const cocos2d::Size& size) override;

     virtual void onEnter() override;

     friend class EditTextFactory;

 private:
     EditTextAndroid();
     static EditTextAndroid* create();

     cocos2d::JniMethodInfo getJavaMethod(const char* name, const char* param);
     void setPositionAndroid();
     void setContentSizeAndroid();

     jobject _object;
 };

 #endif /* defined(__CocosAndroidStudio__EditTextAndroid__) */

EditTextAndroid.h

 #include "EditTextAndroid.h"
 #include "cocos2d.h"
 #include <unistd.h>
 #include <string>

 USING_NS_CC;
 using namespace std;

 EditTextAndroid* EditTextAndroid::create() {
     auto ret = new EditTextAndroid();
     ret->autorelease();
     return ret;
 }

 EditTextAndroid::EditTextAndroid() {
     auto env = cocos2d::JniHelper::getEnv();

     jclass cls = env->FindClass("org/red/tools/RedEditText");
     assert(cls != NULL);

     jmethodID ctor = env->GetMethodID(cls, "<init>", "()V");
     assert(ctor != NULL);

     this->_object = env->NewObject(cls, ctor);
     env->NewGlobalRef(this->_object);
 }

 EditTextAndroid::~EditTextAndroid() {
     auto env = cocos2d::JniHelper::getEnv();
     env->DeleteGlobalRef(this->_object);
 }

 JniMethodInfo EditTextAndroid::getJavaMethod(const char* name, const char* param) {
     JniMethodInfo info;
     bool isHave = JniHelper::getMethodInfo(info, "org/red/tools/RedEditText", name, param);
     assert(isHave);
     return info;
 }

 void EditTextAndroid::setString(const std::string& str) {
     auto info = getJavaMethod("setString", "(Ljava/lang/String;)V");
     jstring jstr = info.env->NewStringUTF(str.c_str());
     info.env->CallVoidMethod(this->_object, info.methodID, jstr);
 }

 std::string EditTextAndroid::getString() {
     auto info = getJavaMethod("getString", "()Ljava/lang/String;");
     auto jstr = (jstring)info.env->CallObjectMethod(this->_object, info.methodID);

     jboolean isCopy;
     auto chars = info.env->GetStringUTFChars(jstr, &isCopy);
     std::string str(chars);
     if(isCopy == JNI_TRUE) {
         info.env->ReleaseStringUTFChars(jstr, chars);
     }
     info.env->DeleteLocalRef(jstr);
     return str;
 }

 void EditTextAndroid::setPosition(const Vec2& pos) {
     EditText::setPosition(pos);
     setPositionAndroid();
 }

 void EditTextAndroid::setContentSize(const Size& size) {
     EditText::setContentSize(size);
     setContentSizeAndroid();
 }

 void EditTextAndroid::setPositionAndroid() {
     if(isRunning()) {
         auto pos = convertToWorldSpace(Vec2(, getContentSize().height));
         auto info = getJavaMethod("setPosition", "(II)V");
         auto visHeight = Director::getInstance()->getVisibleSize().height;
         info.env->CallVoidMethod(this->_object, info.methodID, jint(pos.x), jint(visHeight - pos.y));
     }
 }

 void EditTextAndroid::setContentSizeAndroid() {
     if(isRunning()) {
         auto realSize = SizeApplyAffineTransform(getContentSize(), getNodeToWorldAffineTransform());
         auto info = getJavaMethod("setContentSize", "(II)V");
         info.env->CallVoidMethod(this->_object, info.methodID, jint(realSize.width), jint(realSize.height));
     }
 }

 void EditTextAndroid::onEnter() {
     EditText::onEnter();
     setPositionAndroid();
     setContentSizeAndroid();
 }

 extern "C" {
     JNIEXPORT void JNICALL Java_org_red_tools_RedEditText_nativeOnTextChanged(JNIEnv *env, jobject javaThis, jstring jstr) {
         jboolean isCopy;
         auto chars = env->GetStringUTFChars(jstr, &isCopy);
         std::string str(chars);
         if(isCopy == JNI_TRUE) {
             env->ReleaseStringUTFChars(jstr, chars);
         }
         log("[Red] textChanged: %s", str.c_str());
     }
 }

EditTextAndroid.cpp

 #ifndef __CocosAndroidStudio__EditTextFactory__
 #define __CocosAndroidStudio__EditTextFactory__

 #include "EditText.h"
 #include <map>
 #include "platform/android/jni/JniHelper.h"

 class EditTextFactory {
 public:
     static EditTextFactory* getInstance();

     EditText* createEditText();
     EditText* getEditTextByJobject(jobject obj);

 private:
     EditTextFactory();

     std::map<jobject, EditText*> _map;
 };

 #endif /* defined(__CocosAndroidStudio__EditTextFactory__) */

EditTextFactory.h

 #include "EditTextFactory.h"
 #include "EditTextAndroid.h"
 #include <string>
 #include "cocos2d.h"

 EditTextFactory::EditTextFactory() {}

 EditTextFactory* EditTextFactory::getInstance() {
     static EditTextFactory instance;
     return &instance;
 }

 EditText* EditTextFactory::createEditText() {
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID)
     auto edit =  EditTextAndroid::create();
     auto jobj = edit->_object;
     _map.insert(std::pair<jobject, EditText*>(jobj, edit));
     return edit;
 #endif

     return nullptr;
 }

 EditText* EditTextFactory::getEditTextByJobject(jobject obj) {
     return _map[obj];
 }

EditTextFactory.cpp

 package org.red.tools;

 import org.cocos2dx.lib.Cocos2dxActivity;

 import android.graphics.Color;
 import android.os.Handler;
 import android.os.Looper;
 import android.text.Editable;
 import android.text.TextWatcher;
 import android.util.Log;
 import android.view.inputmethod.EditorInfo;
 import android.widget.EditText;
 import android.widget.FrameLayout;

 public class RedEditText {

     private EditText _edit;

     public RedEditText() {
         new Handler(Looper.getMainLooper()).post(new Runnable() {
             @Override
             public void run() {
                 RedEditText.this._edit = new EditText(Cocos2dxActivity.getContext());
                 EditText edit = RedEditText.this._edit;
                 //edit.setBackgroundDrawable(null);
                 edit.setTextColor(Color.rgb(255, 255, 255));
                 edit.setMaxLines(1);
                 edit.setSingleLine();
                 edit.setImeOptions(EditorInfo.IME_FLAG_NO_EXTRACT_UI);
                 Cocos2dxActivity activity = (Cocos2dxActivity)(Cocos2dxActivity.getContext());
                 FrameLayout root = (FrameLayout)activity.findViewById(android.R.id.content).getRootView();
                 root.addView(edit);

                 edit.addTextChangedListener(new TextWatcher() {
                     @Override
                     public void onTextChanged(CharSequence s, int start, int before, int count) {
                         nativeOnTextChanged(s.toString());
                     }

                     @Override
                     public void beforeTextChanged(CharSequence s, int start, int count, int after) {}
                     @Override
                     public void afterTextChanged(Editable s) {}
                 });
             }
         });
     }

     public void setString(final String str) {
         Log.e("red", str);
         new Handler(Looper.getMainLooper()).post(new Runnable() {
             @Override
             public void run() {
                 _edit.setText(str);
             }
         });
     }

     public String getString() {
         return _edit.getText().toString();
     }

     public void setContentSize(final int w, final int h) {
         new Handler(Looper.getMainLooper()).post(new Runnable() {
             @Override
             public void run() {
                 FrameLayout.LayoutParams params = (FrameLayout.LayoutParams)_edit.getLayoutParams();
                 params.width = w;
                 params.height = h;
                 _edit.setLayoutParams(params);
             }
         });
     }

     public void setPosition(final int x, final int y) {
         new Handler(Looper.getMainLooper()).post(new Runnable() {
             @Override
             public void run() {
                 FrameLayout.LayoutParams params = (FrameLayout.LayoutParams)_edit.getLayoutParams();
                 params.leftMargin = x;
                 params.topMargin = y;
                 _edit.setLayoutParams(params);
             }
         });
     }

     private native void nativeOnTextChanged(String s);

 }

RedEditText.java

最后是luabinding，吐血推荐教程：http://www.cocos.com/doc/tutorial/show?id=1295

这是我绑定之后的代码，可以直接用：

 #include "base/ccConfig.h"
 #if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC || CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
 #ifndef __RedBindings_h__
 #define __RedBindings_h__

 #ifdef __cplusplus
 extern "C" {
 #endif
 #include "tolua++.h"
 #ifdef __cplusplus
 }
 #endif

 int register_all_RedBindings(lua_State* tolua_S);

 #endif // __RedBindings_h__
 #endif //#if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC || CC_TARGET_PLATFORM == CC_PLATFORM_WIN32

lua_RedBindings_auto.hpp

 #include "lua_RedBindings_auto.hpp"
 #if CC_TARGET_PLATFORM == CC_PLATFORM_ANDROID || CC_TARGET_PLATFORM == CC_PLATFORM_IOS || CC_TARGET_PLATFORM == CC_PLATFORM_MAC || CC_TARGET_PLATFORM == CC_PLATFORM_WIN32
 #include "RedBindings.h"
 #include "tolua_fix.h"
 #include "LuaBasicConversions.h"

 int lua_RedBindings_EditText_setString(lua_State* tolua_S)
 {
     int argc = ;
     EditText* cobj = nullptr;
     bool ok  = true;

 #if COCOS2D_DEBUG >= 1
     tolua_Error tolua_err;
 #endif

 #if COCOS2D_DEBUG >= 1
     if (!tolua_isusertype(tolua_S,,"EditText",,&tolua_err)) goto tolua_lerror;
 #endif

     cobj = (EditText*)tolua_tousertype(tolua_S,,);

 #if COCOS2D_DEBUG >= 1
     if (!cobj)
     {
         tolua_error(tolua_S,"invalid 'cobj' in function 'lua_RedBindings_EditText_setString'", nullptr);
         return ;
     }
 #endif

     argc = lua_gettop(tolua_S)-;
     if (argc == )
     {
         std::string arg0;

         ok &= luaval_to_std_string(tolua_S, ,&arg0, "EditText:setString");
         if(!ok)
         {
             tolua_error(tolua_S,"invalid arguments in function 'lua_RedBindings_EditText_setString'", nullptr);
             return ;
         }
         cobj->setString(arg0);
         lua_settop(tolua_S, );
         return ;
     }
     luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "EditText:setString",argc, );
     return ;

 #if COCOS2D_DEBUG >= 1
     tolua_lerror:
     tolua_error(tolua_S,"#ferror in function 'lua_RedBindings_EditText_setString'.",&tolua_err);
 #endif

     return ;
 }
 int lua_RedBindings_EditText_getString(lua_State* tolua_S)
 {
     int argc = ;
     EditText* cobj = nullptr;
     bool ok  = true;

 #if COCOS2D_DEBUG >= 1
     tolua_Error tolua_err;
 #endif

 #if COCOS2D_DEBUG >= 1
     if (!tolua_isusertype(tolua_S,,"EditText",,&tolua_err)) goto tolua_lerror;
 #endif

     cobj = (EditText*)tolua_tousertype(tolua_S,,);

 #if COCOS2D_DEBUG >= 1
     if (!cobj)
     {
         tolua_error(tolua_S,"invalid 'cobj' in function 'lua_RedBindings_EditText_getString'", nullptr);
         return ;
     }
 #endif

     argc = lua_gettop(tolua_S)-;
     if (argc == )
     {
         if(!ok)
         {
             tolua_error(tolua_S,"invalid arguments in function 'lua_RedBindings_EditText_getString'", nullptr);
             return ;
         }
         std::string ret = cobj->getString();
         tolua_pushcppstring(tolua_S,ret);
         return ;
     }
     luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "EditText:getString",argc, );
     return ;

 #if COCOS2D_DEBUG >= 1
     tolua_lerror:
     tolua_error(tolua_S,"#ferror in function 'lua_RedBindings_EditText_getString'.",&tolua_err);
 #endif

     return ;
 }
 static int lua_RedBindings_EditText_finalize(lua_State* tolua_S)
 {
     printf("luabindings: finalizing LUA object (EditText)");
     return ;
 }

 int lua_register_RedBindings_EditText(lua_State* tolua_S)
 {
     tolua_usertype(tolua_S,"EditText");
     tolua_cclass(tolua_S,"EditText","EditText","cc.Node",nullptr);

     tolua_beginmodule(tolua_S,"EditText");
         tolua_function(tolua_S,"setString",lua_RedBindings_EditText_setString);
         tolua_function(tolua_S,"getString",lua_RedBindings_EditText_getString);
     tolua_endmodule(tolua_S);
     std::string typeName = typeid(EditText).name();
     g_luaType[typeName] = "EditText";
     g_typeCast["EditText"] = "EditText";
     return ;
 }

 int lua_RedBindings_EditTextFactory_getEditTextByJobject(lua_State* tolua_S)
 {
     int argc = ;
     EditTextFactory* cobj = nullptr;
     bool ok  = true;

 #if COCOS2D_DEBUG >= 1
     tolua_Error tolua_err;
 #endif

 #if COCOS2D_DEBUG >= 1
     if (!tolua_isusertype(tolua_S,,"EditTextFactory",,&tolua_err)) goto tolua_lerror;
 #endif

     cobj = (EditTextFactory*)tolua_tousertype(tolua_S,,);

 #if COCOS2D_DEBUG >= 1
     if (!cobj)
     {
         tolua_error(tolua_S,"invalid 'cobj' in function 'lua_RedBindings_EditTextFactory_getEditTextByJobject'", nullptr);
         return ;
     }
 #endif

     argc = lua_gettop(tolua_S)-;
     if (argc == )
     {
         _jobject* arg0;

         ok &= luaval_to_object<_jobject>(tolua_S, , "_jobject",&arg0, "EditTextFactory:getEditTextByJobject");
         if(!ok)
         {
             tolua_error(tolua_S,"invalid arguments in function 'lua_RedBindings_EditTextFactory_getEditTextByJobject'", nullptr);
             return ;
         }
         EditText* ret = cobj->getEditTextByJobject(arg0);
         object_to_luaval<EditText>(tolua_S, "EditText",(EditText*)ret);
         return ;
     }
     luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "EditTextFactory:getEditTextByJobject",argc, );
     return ;

 #if COCOS2D_DEBUG >= 1
     tolua_lerror:
     tolua_error(tolua_S,"#ferror in function 'lua_RedBindings_EditTextFactory_getEditTextByJobject'.",&tolua_err);
 #endif

     return ;
 }
 int lua_RedBindings_EditTextFactory_createEditText(lua_State* tolua_S)
 {
     int argc = ;
     EditTextFactory* cobj = nullptr;
     bool ok  = true;

 #if COCOS2D_DEBUG >= 1
     tolua_Error tolua_err;
 #endif

 #if COCOS2D_DEBUG >= 1
     if (!tolua_isusertype(tolua_S,,"EditTextFactory",,&tolua_err)) goto tolua_lerror;
 #endif

     cobj = (EditTextFactory*)tolua_tousertype(tolua_S,,);

 #if COCOS2D_DEBUG >= 1
     if (!cobj)
     {
         tolua_error(tolua_S,"invalid 'cobj' in function 'lua_RedBindings_EditTextFactory_createEditText'", nullptr);
         return ;
     }
 #endif

     argc = lua_gettop(tolua_S)-;
     if (argc == )
     {
         if(!ok)
         {
             tolua_error(tolua_S,"invalid arguments in function 'lua_RedBindings_EditTextFactory_createEditText'", nullptr);
             return ;
         }
         EditText* ret = cobj->createEditText();
         object_to_luaval<EditText>(tolua_S, "EditText",(EditText*)ret);
         return ;
     }
     luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d \n", "EditTextFactory:createEditText",argc, );
     return ;

 #if COCOS2D_DEBUG >= 1
     tolua_lerror:
     tolua_error(tolua_S,"#ferror in function 'lua_RedBindings_EditTextFactory_createEditText'.",&tolua_err);
 #endif

     return ;
 }
 int lua_RedBindings_EditTextFactory_getInstance(lua_State* tolua_S)
 {
     int argc = ;
     bool ok  = true;

 #if COCOS2D_DEBUG >= 1
     tolua_Error tolua_err;
 #endif

 #if COCOS2D_DEBUG >= 1
     if (!tolua_isusertable(tolua_S,,"EditTextFactory",,&tolua_err)) goto tolua_lerror;
 #endif

     argc = lua_gettop(tolua_S) - ;

     if (argc == )
     {
         if(!ok)
         {
             tolua_error(tolua_S,"invalid arguments in function 'lua_RedBindings_EditTextFactory_getInstance'", nullptr);
             return ;
         }
         EditTextFactory* ret = EditTextFactory::getInstance();
         object_to_luaval<EditTextFactory>(tolua_S, "EditTextFactory",(EditTextFactory*)ret);
         return ;
     }
     luaL_error(tolua_S, "%s has wrong number of arguments: %d, was expecting %d\n ", "EditTextFactory:getInstance",argc, );
     return ;
 #if COCOS2D_DEBUG >= 1
     tolua_lerror:
     tolua_error(tolua_S,"#ferror in function 'lua_RedBindings_EditTextFactory_getInstance'.",&tolua_err);
 #endif
     return ;
 }
 static int lua_RedBindings_EditTextFactory_finalize(lua_State* tolua_S)
 {
     printf("luabindings: finalizing LUA object (EditTextFactory)");
     return ;
 }

 int lua_register_RedBindings_EditTextFactory(lua_State* tolua_S)
 {
     tolua_usertype(tolua_S,"EditTextFactory");
     tolua_cclass(tolua_S,"EditTextFactory","EditTextFactory","",nullptr);

     tolua_beginmodule(tolua_S,"EditTextFactory");
         tolua_function(tolua_S,"getEditTextByJobject",lua_RedBindings_EditTextFactory_getEditTextByJobject);
         tolua_function(tolua_S,"createEditText",lua_RedBindings_EditTextFactory_createEditText);
         tolua_function(tolua_S,"getInstance", lua_RedBindings_EditTextFactory_getInstance);
     tolua_endmodule(tolua_S);
     std::string typeName = typeid(EditTextFactory).name();
     g_luaType[typeName] = "EditTextFactory";
     g_typeCast["EditTextFactory"] = "EditTextFactory";
     return ;
 }

 static int lua_RedBindings_EditTextAndroid_finalize(lua_State* tolua_S)
 {
     printf("luabindings: finalizing LUA object (EditTextAndroid)");
     return ;
 }

 int lua_register_RedBindings_EditTextAndroid(lua_State* tolua_S)
 {
     tolua_usertype(tolua_S,"EditTextAndroid");
     tolua_cclass(tolua_S,"EditTextAndroid","EditTextAndroid","EditText",nullptr);

     tolua_beginmodule(tolua_S,"EditTextAndroid");
     tolua_endmodule(tolua_S);
     std::string typeName = typeid(EditTextAndroid).name();
     g_luaType[typeName] = "EditTextAndroid";
     g_typeCast["EditTextAndroid"] = "EditTextAndroid";
     return ;
 }
 TOLUA_API int register_all_RedBindings(lua_State* tolua_S)
 {
     tolua_open(tolua_S);

     tolua_module(tolua_S,"red",);
     tolua_beginmodule(tolua_S,"red");

     lua_register_RedBindings_EditText(tolua_S);
     lua_register_RedBindings_EditTextFactory(tolua_S);
     lua_register_RedBindings_EditTextAndroid(tolua_S);

     tolua_endmodule(tolua_S);
     return ;
 }

 #endif

lua_RedBindings_auto.cpp