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Question by siddharth3322 · Oct 23, 2014 at 06:22 PM · androidandroidpluginnative

Call native android constructor

I want to create instance of native android File class. For that I have used following code

 AndroidJavaClass fileClass = new AndroidJavaClass("java.io.File");
 AndroidJavaObject fileObject = new AndroidJavaObject("java.io.File");

But after seeing java api, I found that File class contains one argument in constructor no constructor with empty argument available. In unity, I don't know way to pass argument within constructor and I want to use FIle class instance variable.

Please give some guidance in this.

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Answer by liortal · Oct 23, 2014 at 09:49 PM

The following code:

 AndroidJavaObject fileObject = new AndroidJavaObject("java.io.File");

Is equivalent to calling this Java code:

 File fileObject = new File();

The AndroidJavaObject constructor allows passing parameters that will be in turn passed along to the Java constructor.

So, in order to initialize a File object, pass the correct constructor arguments, e.g:

 // Call the File(string path) constructor
 AndroidJavaObject fileObject = new AndroidJavaObject("java.io.File", "/some/path/somePath.txt");


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avatar image siddharth3322 · Oct 24, 2014 at 04:25 AM 0
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Thanks a lot, I learn lots of new things from link also.

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Answer by kromenak · Oct 23, 2014 at 06:30 PM

According to http://docs.unity3d.com/ScriptReference/AndroidJavaObject-ctor.html, you can pass arguments when you create an AndroidJavaObject. The examples show how this would work.

The AndroidJavaObject accepts a list of arguments as it's second parameter, which should allow you to call whatever version of the File class constructor that you'd like.

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avatar image siddharth3322 · Oct 24, 2014 at 04:26 AM 0
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Thanks for your help but other answer is more specific to answer so make that correct.

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