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因?yàn)樽罱?xiàng)目的需要,需要實(shí)現(xiàn)一個(gè)拖動(dòng)效果,看了一下網(wǎng)上剛好有這種拖動(dòng)效果的demo,代碼大概如下:
private void initListener(){ screenWidth = getScreenWidth(this);//獲取屏幕寬度 screenHeight = getScreenHeight(this) - getStatusHeight(MainActivity.this);//屏幕高度-狀態(tài)欄 testTv.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; int top = v.getTop() + dy; int left = v.getLeft() + dx; if (top <= 0) { top = 0; } if (top >= screenHeight - testTv.getHeight() ) { top = screenHeight - testTv.getHeight(); } if (left >= screenWidth - testTv.getWidth()) { left = screenWidth - testTv.getWidth(); } if (left <= 0) { left = 0; } v.layout(left, top, left+v.getWidth(), top+v.getHeight()); v.postInvalidate(); lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: break; } return true;//這里根據(jù)項(xiàng)目需要選擇false與true } }); }
可是我的項(xiàng)目本身是有涂鴉的界面,還有很多復(fù)雜的事件,發(fā)現(xiàn)會(huì)有很奇怪的效果,抖動(dòng)很厲害,而且時(shí)不時(shí)回到原來(lái)的位置,后來(lái)發(fā)現(xiàn)這個(gè)v.layout(left, top, left+v.getWidth(), top+v.getHeight());可能不適合項(xiàng)目的需求,所以我想了另一種解法。代碼如下:
private void initListener(){ screenWidth = getScreenWidth(this);//獲取屏幕寬度 screenHeight = getScreenHeight(this) - getStatusHeight(MainActivity.this);//屏幕高度-狀態(tài)欄 testTv.setOnTouchListener(new View.OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_MOVE: int dx = (int) event.getRawX() - lastX; int dy = (int) event.getRawY() - lastY; int top = v.getTop() + dy; int left = v.getLeft() + dx; if (top <= 0) { top = 0; } if (top >= screenHeight - testTv.getHeight() ) { top = screenHeight - testTv.getHeight(); } if (left >= screenWidth - testTv.getWidth()) { left = screenWidth - testTv.getWidth(); } if (left <= 0) { left = 0; } RelativeLayout.LayoutParams param = new RelativeLayout.LayoutParams(v.getWidth(), v.getHeight()); param.leftMargin = left; param.topMargin = top; v.setLayoutParams(param); // v.layout(left, top, left+v.getWidth(), top+v.getHeight()); v.postInvalidate(); lastX = (int) event.getRawX(); lastY = (int) event.getRawY(); break; case MotionEvent.ACTION_UP: break; } return true; } }); }
效果如下圖:
覺(jué)得可以了,不過(guò)要注意一些事項(xiàng):鍵盤(pán)彈出需要自己處理一下(比如處理成彈出鍵盤(pán)就不能移動(dòng)這些,不然會(huì)變形的),我覺(jué)得這種寫(xiě)法可以應(yīng)用于各種復(fù)雜的場(chǎng)景。好了,今天一些項(xiàng)目問(wèn)題總結(jié)就到這里了,希望對(duì)大家有幫助,代碼也上傳了,地址如下:Android實(shí)現(xiàn)拖動(dòng)效果
以上所述是小編給大家介紹Android實(shí)現(xiàn)拖動(dòng)效果,希望對(duì)大家有所幫助,如果大家有任何疑問(wèn)請(qǐng)給我留言,小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)億速云網(wǎng)站的支持!
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