OnLongClickListener不工作 [英] OnLongClickListener not working

问题描述

我有一个的ImageView 。我需要使用 onLongClickListener 的ImageView的。当我用这个code没有发生。

code：

 图库=（图库论坛）findViewById（R.id.gall1）; gallery.setAdapter（新ImageAdapter（MainActivity.this））;            gallery.setOnItemClickListener（新OnItemClickListener（）
            {                @覆盖
                公共无效onItemClick（
                        适配器视图＆LT;＆GT;父视图V，
                        INT位置，长的id）{
                    // TODO自动生成方法存根                    最后ImageView的ImageView的=（ImageView的）findViewById（R.id.image1）;
                    imageView.setImageResource（imageIDs [位置]）;                    imageView.setLongClickable（真）;
     imageView.setOnLongClickListener（新View.OnLongClickListener（）{        @覆盖
        公共布尔onLongClick（视图v）{
            // TODO自动生成方法存根                            Toast.makeText（getApplicationContext（），龙preSS的工作，Toast.LENGTH_SHORT）.show（）;        返回true;
            }      }）;
  imageView.setOnTouchListener（新View.OnTouchListener（）{    @覆盖
    公共布尔onTouch（视图V，MotionEvent事件）{
    // TODO自动生成方法存根
    的LayoutParams =（RelativeLayout.LayoutParams）imageView.getLayoutParams（）;        开关（event.getAction（））
             {
   案例MotionEvent.ACTION_DOWN：
      {
   PARMS =（RelativeLayout.LayoutParams）imageView.getLayoutParams（）;            DX = event.getRawX（） -  parms.leftMargin;
    DY = event.getRawY（） -  parms.topMargin;
     }
 打破;
  案例MotionEvent.ACTION_MOVE：
{
 X = event.getRawX（）;
 Y = event.getRawY（）;
  parms.leftMargin =（INT）（X-DX）;
 parms.topMargin =（INT）（Y  -  DY）;
                                    imageView.setLayoutParams（PARMS）;
     }
 打破;
 案例MotionEvent.ACTION_UP：
 {     }
   打破;
 }  返回true;
    }
}）;
    }
 }）;
 

解决方案

您需要启用长按由code：

  imageView.setLongClickable（真）;
imageView.setClickable（真）;
 

最后一行可能是没有必要的，但它也使任何麻烦。

I have an ImageView. I need to use onLongClickListener for ImageView. When I use this code nothing happen.

Code:

 gallery=(Gallery)findViewById(R.id.gall1);

 gallery.setAdapter(new ImageAdapter(MainActivity.this));

            gallery.setOnItemClickListener(new OnItemClickListener()
            {

                @Override
                public void onItemClick(
                        AdapterView<?> parent, View v,
                        int position, long id) {
                    // TODO Auto-generated method stub

                    final ImageView imageView = (ImageView) findViewById(R.id.image1);
                    imageView.setImageResource(imageIDs[position]);

                    imageView.setLongClickable(true);


     imageView.setOnLongClickListener(new View.OnLongClickListener(){

        @Override
        public boolean onLongClick(View v) {
            // TODO Auto-generated method stub

                            Toast.makeText(getApplicationContext(), "Long Press work", Toast.LENGTH_SHORT).show();

        return true;
            }

      });


  imageView.setOnTouchListener(new View.OnTouchListener() {

    @Override
    public boolean onTouch(View v,MotionEvent event) {
    // TODO Auto-generated method stub
    layoutParams = (RelativeLayout.LayoutParams) imageView.getLayoutParams();

        switch(event.getAction())
             {
   case MotionEvent.ACTION_DOWN :
      {
   parms = (RelativeLayout.LayoutParams) imageView.getLayoutParams();

            dx = event.getRawX() - parms.leftMargin;
    dy = event.getRawY() - parms.topMargin;
     }
 break;
  case MotionEvent.ACTION_MOVE :
{   
 x = event.getRawX();
 y = event.getRawY();
  parms.leftMargin = (int) (x-dx);
 parms.topMargin = (int) (y - dy);
                                    imageView.setLayoutParams(parms);
     }
 break;
 case MotionEvent.ACTION_UP :
 {

     }
   break;
 }

  return true;
    }
});
    }


 });

解决方案

You need to enable long click by code:

imageView.setLongClickable(true);
imageView.setClickable(true);

The last line is probably not necessary but it also makes no trouble.

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