Cocos2d-x Jni C + + Java intermodulation Security Refreshing UI Controls simplest example (bottom)

Turn from: http://blog.csdn.net/liuyuyefz/article/details/17758809

C + + Invoke Java Chapter:

C + + calls java. Refresh the Android Edit view Control

Step one: Set the framelayout as a global variable in the Cocosdxactivity class in the engine library

Step Two: Create a layout file for a text edit box

The reference code is as follows:

<?xmlversion= "1.0" encoding= "Utf-8"?>

<edittextxmlns:android= "Http://schemas.android.com/apk/res/android"

Android:layout_width= "100dip"

android:layout_height= "60dip"

android:layout_marginleft= "20DP"

android:layout_margintop= "200DP"

android:layout_marginright= ' 20DP '

Android:layout_marginbottom= ' 20DP '

>

</EditText>

Step three: Declare a global edit box in Testjni

The reference code is as follows:

public static EditText MyView;

Step Fourth: Put the text edit box just stated into the layoutinflater and add it to the Cocos2d-x framelayout

The reference code is as follows:

Layoutinflater Inflater = (layoutinflater) getsystemservice (Context.layout_inflater_service);

MyView = (edittext) layoutinflater.from (this). Inflate (R.layout.myedit,framelayout,false);

Myview.addtextchangedlistener (watcher);

Myview.setmovementmethod (Scrollingmovementmethod.getinstance ());

Framelayout.addview (MyView);

Fifth step: Add a listener to the text box and call this callback function when the text box state changes

The reference code is as follows:

Textwatcher watcher = new Textwatcher ()

{

@Override

public void aftertextchanged (Editable s)

{

TODO auto-generated Method Stub

LOG.D ("TAG", "111111");

}

@Override

public void beforetextchanged (charsequence s, int start, int count, int)

{

TODO auto-generated Method Stub

LOG.D ("TAG", "22222");

}

@Override

public void ontextchanged (charsequence s, int start, int before, int count)

{

LOG.D ("TAG", "33==[textwatcher][ontextchanged]" +s);

}

};

Step Sixth: Create a message-passing function that creates a message-received handle. Used to send C + + message, back to the main thread to notify the UI refresh (directly on other threads refreshing the main thread UI will crash)

The reference code is as follows:

public static void Hideadview (string[] str)

{

Mhandler.obtainmessage (str). Sendtotarget ();

}

private static Handlermhandler =new Handler ()

{

public void Handlemessage (msg)

{

Switch (msg.what)

{

Case 100://UPDATE_UI:

{

String[] Arrstrings = (string[]) msg.obj;

if (arrstrings[0].equals ("I ' m a Titile"))

{

TestJni.this.myView.setText ("C + + change Java editview string test!");

}

}

Break

Default

Break

}

}

};

Add: Here are two alternate functions that change the state of the input box

Myview.setbackgroundcolor (color.transparent)//change background color transparent

Framelayout.removeview (MyView);//Remove control

C + + Partial code

Step one: Create JNI for sending information

The reference code is as follows: (I will explain this code in detail below)

#if (Cc_target_platform = = cc_platform_android)

#include "platform/android/jni/jnihelper.h"///JNI Help header file to function correctly

void Helloworld::gojava ()

{

Jnimethodinfo JMI;

if (Jnihelper::getstaticmethodinfo (JMI, "Org/cocos2dx/testjni/testjni", "Hideadview", "([ljava/lang/string;) V"))

{

Jclass str_cls = Jmi.env->findclass ("java/lang/string");

Jstring str1 = Jmi.env->newstringutf ("I ' m a Titile");

Jstring str2 = Jmi.env->newstringutf ("Are yor exit game?");

Jobjectarray Arrs = Jmi.env->newobjectarray (2, str_cls, 0);

Jmi.env->setobjectarrayelement (arrs, 0, str1);

Jmi.env->setobjectarrayelement (Arrs, 1, str2);

Jmi.env->callstaticvoidmethod (Jmi.classid, Jmi.methodid, Arrs);

}

}

#endif

The first part:

#if (Cc_target_platform = = cc_platform_android)

#endif

This is a limited platform-wide macro statement, because we don't want to have code that calls Android in iOS code, so we put our code on the Android platform and it doesn't affect other platforms.

Part II:

The following code explains:

Jnimethodinfo JMI;

if (Jnihelper::getstaticmethodinfo (JMI, "Org/cocos2dx/testjni/testjni", "Hideadview", "([ljava/lang/string;) V")) 1, the above code is universal, most of the JNI format is so

Jnimethodinfo says a method is declared,

2, below Jnihelper::getstaticmethodinfo We will assign this method to the "Hideview" method in Java that we want to execute

3, the "Org/cocos2dx/testjni/testjni" part of the law is

"Package name org/cocos2dx/testjni/the class name of the class where the method is to be executed Testjni"

4, "Hideadview" for the Java side inherited the method.

5, "([ljava/lang/string;) V")]

Specify the type of return value

6,

Jclass str_cls = Jmi.env->findclass ("java/lang/string");

String Tool Library to import JNI

7, create two JNI string

Jstring str1 = Jmi.env->newstringutf ("I ' m a Titile");

Jstring str2 = Jmi.env->newstringutf ("Are yor exit game?");

8, initialize the creation of an array

Jobjectarray Arrs = Jmi.env->newobjectarray (2, str_cls, 0);

9, add two sring to an array

Jmi.env->setobjectarrayelement (arrs, 0, str1);

Jmi.env->setobjectarrayelement (Arrs, 1, str2);

10, invoke the Java method and pass the array as a parameter to the past

Jmi.env->callstaticvoidmethod (Jmi.classid, Jmi.methodid, Arrs);

The Jni method is invoked at the end of the HelloWorld program we have established to be executed anywhere.

#if (Cc_target_platform = = cc_platform_android)

Gojava ();

#endif

Then compiled C + + and Android can be true machine debugging see the results.