如何触摸监听器添加到表面的看法? [英] How to add a touch listener to a surface view?

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问题描述

我是新来的Andr​​oid,所以请原谅如果是问过!

我与一些相机code打(在网上找到),我想显示/隐藏屏幕上的一些按钮。当用户触摸屏幕时,我希望它捕捉图像。

我的设置:

1。
主要活动:

 公共类CameraDemo延伸活动{
/ **当第一次创建活动调用。 * /
    @覆盖
    公共无效的onCreate(捆绑savedInstanceState){
        super.onCreate(savedInstanceState);
        的setContentView(R.layout.main_inuse);        preVIEW =新的preVIEW(本);        ((的FrameLayout)findViewById(R.id. preVIEW))addView(preVIEW)。......
//将code,抓住当按钮为pressed图像的其余部分。
//按钮被main.xml中定义的按钮的ID ButtonClicked
}

2。
在preVIEW类看起来是这样的:

 类preVIEW延伸SurfaceView实现SurfaceHolder.Callback {    SurfaceHolder mHolder;
    公共摄像头摄像头;    preVIEW(上下文的背景下){
        超级(上下文);        //安装SurfaceHolder.Callback所以我们得到通知时,
        //创建下垫面和销毁。
        mHolder = getHolder();
        mHolder.addCallback(本);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

我的问题是,


  1. 我如何添加触摸功能,使用户可以触摸preVIEW(说的第二个,或者只是快速触摸)和有事? (说的图像保存)


  2. 和一个按钮会出现在表面上说下一步按钮,例如?



解决方案

  @覆盖
公共布尔onTouchEvent(MotionEvent事件){
    返回super.onTouchEvent(事件);
}

在您的preVIEW类中,MotionEvent对象将告诉你这是什么样的触摸(和位置等等等等),让你做任何你想做的事情。

I am new to Android, so please excuse if it is asked before!

I am playing with some camera code (found online) and I want to show/hide some buttons on screen. When the user touches the screen, I want it to capture the image.

My setup:

1. Main Activity:

public class CameraDemo extends Activity {
/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main_inuse);

        preview = new Preview(this);

        ((FrameLayout) findViewById(R.id.preview)).addView(preview);

... ...  
// rest of the code that captures the image when a button is pressed.
// the button is defined in main.xml with button id ButtonClicked
}

2. The preview class looks like this:

class Preview extends SurfaceView implements SurfaceHolder.Callback {

    SurfaceHolder mHolder;
    public Camera camera;

    Preview(Context context) {
        super(context);

        // Install a SurfaceHolder.Callback so we get notified when the
        // underlying surface is created and destroyed.
        mHolder = getHolder();
        mHolder.addCallback(this);
        mHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
}

My question is,

  1. How can I add touch functionality so that the user can touch the preview (say for a second, or just touch quickly) and something happens ? (Say image is saved)

  2. And a button will appear on the surface say a "Next" button, for example?

解决方案

@Override
public boolean onTouchEvent(MotionEvent event) {
    return super.onTouchEvent(event);
}

in your preview class , the MotionEvent object will tell you what kind of touch it is (and position etc etc) and let you do whatever you want to do.

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