Android 通過手勢類實現的可拖動佈局例項
阿新 • • 發佈：2019-02-13
平板專案中，由於分為上下兩個佈局，橫豎屏切換時，下方的介面需要顯示更多的資料，所以就想到能不能拖動中間的
按鈕，然後實時的改變佈局的高度，讓其顯示更多的資料，找到一篇部落格如下：轉自：http://www.apkbus.com/thread-74732-1-1.html
功能如下：可實現上下介面分屏顯示，拖動到上面螢幕以上時，下屏全屏顯示；拖動到下面螢幕以下時，上屏全屏顯示；拖動過程中附加動畫效果；
實現步驟：
1.實現GestureDetector.OnGestureListener介面
拖動的處理在如下方法中處理：
@Override
public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX,
float distanceY) {
mIsScrolling = true;
mScrolly += distanceY;
if (mScrolly > 0) {
upLP.height = upLP.height + (int) -mScrolly;
downLP.height = LayoutParams.FILL_PARENT - upLP.height;
if (upLP.height > 0 && upLP.height < 735) {
upFrameLayout.setLayoutParams(upLP);
downFrameLayout.setLayoutParams(downLP);
System.out.println("upHeight:" + upLP.height);
System.out.println("downHeight:" + downLP.height);
}
}
if (mScrolly < 0) {
upLP.height = upLP.height + (int) -mScrolly;
downLP.height = LayoutParams.FILL_PARENT - upLP.height;
if (upLP.height > 0 && upLP.height < 735) {
upFrameLayout.setLayoutParams(upLP);
downFrameLayout.setLayoutParams(downLP);
}
}
return false;
}
2.通過當前佈局高度，觸發佈局非同步改變
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_UP && // onScroll時的ACTION_UP
mIsScrolling == true) {
System.out.println("upHeight:" + upLP.height);
System.out.println("downHeight:" + downLP.height);
if (upLP.height >= 190 && upLP.height < 550) {
new AsynMove().execute(new Integer[] { -MOVE_WIDTH });//向中間收縮
} else if (upLP.height >= 550 || upLP.height < 200) {
new AsynMove().execute(new Integer[] { MOVE_WIDTH });//向上下兩邊收縮
}
}
return mGestureDetector.onTouchEvent(event);
}
};
3.非同步改變佈局，實現動畫效果
class AsynMove extends AsyncTask<Integer, Integer, Void> {
@Override
protected Void doInBackground(Integer... params) {
int times;
if (upLP.height % Math.abs(params[0]) == 0)// 整除
times = upLP.height / Math.abs(params[0]);
else
// 有餘數
times = upLP.height / Math.abs(params[0]) + 1;
for (int i = 0; i < times; i++) {
publishProgress(params);
try {
Thread.sleep(Math.abs(params[0]));
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return null;
}
@Override
protected void onProgressUpdate(Integer... params) {
if (params[0] < 0) {
upLP.height = Math.max(upLP.height + params[0], 380);
} else if (upLP.height > 190) {
upLP.height = Math.min(upLP.height + params[0], 735);
} else {
upLP.height = Math.min(upLP.height + params[0], 0);
}
System.out.println("progressHeight:" + upLP.height);
upFrameLayout.setLayoutParams(upLP);
}
}
資源下載地址為：http://www.apkbus.com/forum.php?mod=attachment&aid=MzcwMDd8YWNmYWMyY2F8MTQ4MjQ2MjQ1MXwwfDc0NzMy