Android实战技巧之七:按钮控制ViewPager的左右翻页
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为了实现左右翻页的效果,使用了ViewPager,它会很方便的实现左右滑动后翻页。
这时需要自己也加上两个button来实现同样的操作,如何实现呢?网上一篇blog帮了忙啦。
【Android】按钮控制ViewPager的左右翻页,保留原有的动画效果
ViewPager的一个公共方法arrowScroll,查看代码我们可以有两个重要的发现:
public boolean executeKeyEvent(KeyEvent event) { boolean handled = false; if (event.getAction() == KeyEvent.ACTION_DOWN) { switch (event.getKeyCode()) { case KeyEvent.KEYCODE_DPAD_LEFT://键盘方向键左键的控制,向左翻页 handled = arrowScroll(FOCUS_LEFT);//FOCUS_LEFT:17 break; case KeyEvent.KEYCODE_DPAD_RIGHT://右键 handled = arrowScroll(FOCUS_RIGHT);//FOCUS_RIGHT:66 break; case KeyEvent.KEYCODE_TAB: if (Build.VERSION.SDK_INT >= 11) { // The focus finder had a bug handling FOCUS_FORWARD and FOCUS_BACKWARD // before Android 3.0. Ignore the tab key on those devices. if (KeyEventCompat.hasNoModifiers(event)) { handled = arrowScroll(FOCUS_FORWARD);//FOCUS_FORWARD:2 } else if (KeyEventCompat.hasModifiers(event, KeyEvent.META_SHIFT_ON)) { handled = arrowScroll(FOCUS_BACKWARD);//FOCUS_BACKWARD:1 } } break; } } return handled; }
public boolean arrowScroll(int direction) { View currentFocused = findFocus(); if (currentFocused == this) currentFocused = null; boolean handled = false; View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); if (nextFocused != null && nextFocused != currentFocused) { if (direction == View.FOCUS_LEFT) { // If there is nothing to the left, or this is causing us to // jump to the right, then what we really want to do is page left. final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left; final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left; if (currentFocused != null && nextLeft >= currLeft) { handled = pageLeft(); } else { handled = nextFocused.requestFocus(); } } else if (direction == View.FOCUS_RIGHT) { // If there is nothing to the right, or this is causing us to // jump to the left, then what we really want to do is page right. final int nextLeft = getChildRectInPagerCoordinates(mTempRect, nextFocused).left; final int currLeft = getChildRectInPagerCoordinates(mTempRect, currentFocused).left; if (currentFocused != null && nextLeft <= currLeft) { handled = pageRight(); } else { handled = nextFocused.requestFocus(); } } } else if (direction == FOCUS_LEFT || direction == FOCUS_BACKWARD) {//17 or 1 // Trying to move left and nothing there; try to page. handled = pageLeft(); } else if (direction == FOCUS_RIGHT || direction == FOCUS_FORWARD) {//66 or 2 // Trying to move right and nothing there; try to page. handled = pageRight(); } if (handled) { playSoundEffect(SoundEffectConstants.getContantForFocusDirection(direction)); } return handled; }
也就是说,我们调用arrowScroll方法用参数1或者17就可以实现向左翻页;参数2或66就可以实现向右翻页。
后记:
当你的UI中有EditText这种获得focus的widget时,则必须用17和66,否则要报错。
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