Android：将对象从活动传递到视图

发布于 2024-11-26 03:56:43 字数 1516 浏览 0 评论 0原文

我的活动从 res.raw 加载数据

为了将这些数据提供给视图，我向视图构造函数添加了一个参数，

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    System.loadLibrary("engine-2d");

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
            WindowManager.LayoutParams.FLAG_FULLSCREEN );

    if (_engine == null)
    {
        Display display = getWindowManager().getDefaultDisplay(); 
        int width = display.getWidth();
        int height = display.getHeight();       

        byte[] scene;
        int scene_size = 0;
        try {
            InputStream ins = getResources().openRawResource(R.raw.package_test);
            scene_size = ins.available(); 
            scene = new byte[scene_size]; 
            ins.read(scene); 
            ins.close(); 
        } catch (IOException e) {
            // Should never happen!
            throw new RuntimeException(e);
        }

        _engine = new PlsEngine2D(scene, scene_size, width, height);
    }

    setContentView(new PlsSurface2D(this, _engine));
}


@Override
public void onDestroy() {
    super.onDestroy();
    _engine.DestroyEngine();
}

我不知道为什么，但是当我按下主页按钮时（我的程序的实例仍在内存中）然后我再次启动该应用程序，它崩溃了。

事实上，PlsEngine2D使用ndk来调用C函数来创建malloc。

我不知道问题出在哪里，但我想知道 malloc 指针是否仍然正确！

或者这可能是我的观点！我将 _engine 对象赋予它。我想知道当视图唤醒时它是否再次具有 _engine param 对象！

还有另一种方法可以将我的 _engine 对象提供给视图吗？视图是否可以将 _engine 值传递给活动？

原文

My activity load data from res.raw

To give those datas to the view, I've added a param to the view construtor

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    System.loadLibrary("engine-2d");

    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, 
            WindowManager.LayoutParams.FLAG_FULLSCREEN );

    if (_engine == null)
    {
        Display display = getWindowManager().getDefaultDisplay(); 
        int width = display.getWidth();
        int height = display.getHeight();       

        byte[] scene;
        int scene_size = 0;
        try {
            InputStream ins = getResources().openRawResource(R.raw.package_test);
            scene_size = ins.available(); 
            scene = new byte[scene_size]; 
            ins.read(scene); 
            ins.close(); 
        } catch (IOException e) {
            // Should never happen!
            throw new RuntimeException(e);
        }

        _engine = new PlsEngine2D(scene, scene_size, width, height);
    }

    setContentView(new PlsSurface2D(this, _engine));
}


@Override
public void onDestroy() {
    super.onDestroy();
    _engine.DestroyEngine();
}

I don't know why but when I press the home button (the instance of my program is still in memory)
and then I launch the application again, it crash.

In fact, PlsEngine2D use ndk to call C function that make malloc.

I do not exactly know where is the problem but I wonder if the malloc pointer are still correct !

Or may be this is my view!
I give the _engine object to it.
I wonder if when the view wake up it have the _engine param object again !

Is there another way to give my _engine object to the view ?
Does the view can take the the _engine value to the activity ?

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