Question

i am loading Web view with Html String,i want to show navigate buttons when the user tap on the web view,i tried With onTouch listener,touch event raises when scrolling and tapping but i want to catch single tap/clickEvent, Not scroll Event touches..., i implemented SetOnClickListener for both WebView and LinearLayout,None of them is not working for me Any help regarding this

Answer 1

。 OnClickListener 。即便在网页上没有发生任何事情,也确实消耗了触角活动(如:),但没有任何机会开展奥恩克的活动。这是非常不幸的。

As a workaround I extended a RelativeLayout and put my WebView inside of it. In the RelativeLayout I ve overwritten onInterceptTouchEvent and were looking for tap events. If a tap is detected then the RelativeLayout s OnClickListener is invoked with performClick().

public class TapAwareRelativeLayout extends RelativeLayout {

    private final float MOVE_THRESHOLD_DP = 20 * getResources().getDisplayMetrics().density;

    private boolean mMoveOccured;
    private float mDownPosX;
    private float mDownPosY;

public TapAwareRelativeLayout(Context context) {
    super(context);
iii

public TapAwareRelativeLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
iii

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {

    final int action = ev.getAction();
    switch (action) {
    case MotionEvent.ACTION_DOWN:
        mMoveOccured = false;
        mDownPosX = ev.getX();
        mDownPosY = ev.getY();
        break;
    case MotionEvent.ACTION_UP:
        if (!mMoveOccured) {
            // TAP occured
            performClick();
        iii
        break;
    case MotionEvent.ACTION_MOVE:
        if (Math.abs(ev.getX() - mDownPosX) > MOVE_THRESHOLD_DP || Math.abs(ev.getY() - mDownPosY) > MOVE_THRESHOLD_DP) {
            mMoveOccured = true;
        iii
        break;

    iii
    return super.onInterceptTouchEvent(ev);
iii

iii

Answer 2

我修改了Zsolt Safrany的回答,并提出了他的on Intercept Touch 活动的内容载于网站概览on Touch 方法,并使用。



webview.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
    Log.v(TAG,"Got a touch event in the web view!");

    final int action = ev.getAction();
    switch (action) {
        case MotionEvent.ACTION_DOWN:
           mMoveOccured = false;
           mDownPosX = ev.getX();
           mDownPosY = ev.getY();
       break;
       case MotionEvent.ACTION_UP:
           if (!mMoveOccured) {
             //click operation is here
           }
      break;
      case MotionEvent.ACTION_MOVE:
          if (Math.abs(ev.getX() - mDownPosX) > MOVE_THRESHOLD_DP || Math.abs(ev.getY() - mDownPosY) > MOVE_THRESHOLD_DP) {
          mMoveOccured = true;
      }
      break;
}
    return false;
}           });

Answer 3

http://www.codeshogun.com/blog/2009/04/16/how-to-implement-swipe-action-in-android/“rel=“nofollow”http://www.codeshogun.com/blog/2009/04/16/how-to-implement-swipe-action-in-android/

It seems that touch events must be properly trapped. Check this out:

@Override
public boolean dispatchTouchEvent(MotionEvent e){
    super.dispatchTouchEvent(e);
    return mGestureDetector.onTouchEvent(e);
}

Answer 4

Worked code ::

final Boolean[] mMoveOccured = new Boolean[1];
final float[] mDownPosX = new float[1];
final float[] mDownPosY = new float[1];

final float MOVE_THRESHOLD_DP = 20 * getResources().getDisplayMetrics().density;

userPic.setOnTouchListener(new View.OnTouchListener() {
      @Override
      public boolean onTouch(View v, MotionEvent event) {
           final int action = event.getAction();
           switch (action) {
               case MotionEvent.ACTION_DOWN:
                    mMoveOccured[0] = false;
                    mDownPosX[0] = event.getX();
                    mDownPosY[0] = event.getY();
                    break;
               case MotionEvent.ACTION_UP:
                    if (!mMoveOccured[0]) {
                       Toast.makeText(v.getContext(), "Webview pressed", Toast.LENGTH_SHORT).show();
                    }
                    break;
               case MotionEvent.ACTION_MOVE:
                    if (Math.abs(event.getX() - mDownPosX[0]) > MOVE_THRESHOLD_DP || Math.abs(event.getY() - mDownPosY[0]) > MOVE_THRESHOLD_DP) {
                            mMoveOccured[0] = true;
                    }
                    break;
            }
            return false;
      }
 });

友情链接