android - 如果用户在不同的图像视图上滑动手指，如何检测 ImageViews 是否被触摸

Question

这背后的基本思想是检测用户在滑动手指到一定数量的图像视图后滑动手指的不同视图的触摸事件，如果它们具有相似的颜色将破坏

Answer 1

尝试这个..

public class SimpleActivity extends Activity implements SimpleGestureListener{

    private SimpleGestureFilter detector;
    private ImageView imgview;  
    private Bitmap bm; 
    private String image_URL="http://4.bp.blogspot.com/-k8Zxa7NXx5c/UAdrZw92MpI/AAAAAAAAAWI/KZ8n8sziFb4/s1600/Adobe-PDF-Alternative.jpg";
    private File file;
    private File folder;
    private int no=1;
    private int totalfiles;
    private int count;

        /** Called when the activity is first created. */
        @Override
        public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
             imgview=(ImageView)findViewById(R.id.imageView1);

             //Download from URL
             Downloadfromurl(image_URL);

            detector = new SimpleGestureFilter(this,this);
        }


     public boolean dispatchTouchEvent(MotionEvent me){ 
       this.detector.onTouchEvent(me);
      return super.dispatchTouchEvent(me); 
     }


     public void onSwipe(int direction) {
      String str = "";

      switch (direction) {

      case SimpleGestureFilter.SWIPE_RIGHT :
          {
              str = "Swipe Right";
              imgfrwd();
               break;
          }
      case SimpleGestureFilter.SWIPE_LEFT :
      {
          str = "Swipe Left";
          imgbkwd();
           break;
      }
      case SimpleGestureFilter.SWIPE_DOWN : 
          {
              str = "Swipe Down";
              imgbkwd();
               break;
          }
      case SimpleGestureFilter.SWIPE_UP : 
      {
          str = "Swipe Up";
          imgfrwd();
          break;
      }


      } 
       Toast.makeText(this, str, Toast.LENGTH_SHORT).show();
     }


     public void onDoubleTap() {
        Toast.makeText(this, "Double Tap", Toast.LENGTH_SHORT).show(); 
     }


     private Bitmap LoadImage(String URL, BitmapFactory.Options options)
      {     
       Bitmap bitmap = null;
       InputStream in = null;     
          try {
              in = OpenHttpConnection(URL);
              bitmap = BitmapFactory.decodeStream(in, null, options);
              in.close();
          } catch (IOException e1) {
          }
          return bitmap;             
      }

    private InputStream OpenHttpConnection(String strURL) throws IOException{
     InputStream inputStream = null;
     URL url = new URL(strURL);
     URLConnection conn = url.openConnection();

     try{
      HttpURLConnection httpConn = (HttpURLConnection)conn;
      httpConn.setRequestMethod("GET");
      httpConn.connect();

      if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
       inputStream = httpConn.getInputStream();
      }
     }
     catch (Exception ex)
     {
     }
     return inputStream;
    }


    void dispimg()
    {
          Bitmap bmp = BitmapFactory.decodeFile(folder + "/page"+no+".PNG");
          imgview.setImageBitmap(bmp);

    }

    void loadfromurl()
    {
         BitmapFactory.Options bmOptions;
           bmOptions = new BitmapFactory.Options();
           bmOptions.inSampleSize = 1;
           bm = LoadImage(image_URL, bmOptions);
          imgview.setImageBitmap(bm);
    }


void imgfrwd()

{

no+=1;
    count=countfiles();
    if(count>=no)
        dispimg();
}
void imgbkwd()
{

    no-=1;
    if(no>=0)
    dispimg();
}

int countfiles()
{
    String[] fileNames = folder.list();
    totalfiles = 0;
    for (int i = 0; i< fileNames.length; i++)
    {
      if (fileNames[i].contains(".PNG"))

          totalfiles++;

      }

    return totalfiles;
}
}