Android实时更新界面问题

Question

我用触摸事件更新屏幕上的PercentRelativeLayout布局的MarginTop。但是在滑动的过程中PercentRelativeLayout布局的顶部出现跳动的现象（就是感觉有拖影），请问我要怎么解决这个问题。

具体bug效果录屏地址：http://pan.baidu.com/s/1hsOAnWg

一下是Java代码：

@OnTouch(R.id.percentRelativeLayout_listView) boolean percentRelativeLayout_listView_OnTouchListener(View v, MotionEvent event) { //滑动位置  float currentY; //结束位置  float endY; if (event.getAction() == MotionEvent.ACTION_DOWN) { initY = event.getY();
        Log.d("按下手势位置", initY + "");
    } else if (event.getAction() == MotionEvent.ACTION_MOVE) {
        currentY = event.getY(); //Log.d("滑动手势位置", currentY + "");  operationOnTouch(currentY);
    } else if (event.getAction() == MotionEvent.ACTION_UP) {
        endY = event.getY(); //Log.d("结束手势位置", endY + "");  operationOnTouch(endY);
    } return true;
} //触摸方向计算 public void operationOnTouch(float Y) { //MarginTop动态值  int margin; //向上滑动  if (initY > Y && (initY - Y) > 5) { //获取原始Margin值  PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams) percentRelativeLayout_listView.getLayoutParams(); int upInitMargin = params.topMargin; //滑动距离  int currentMargin = Math.round(initY - Y); if (upInitMargin > 400) { //设置Margin值  if (upInitMargin - currentMargin != 0 || upInitMargin - currentMargin > 0) {
                margin = upInitMargin - currentMargin;
                PercentRelativeLayout.LayoutParams lp = (PercentRelativeLayout.LayoutParams) percentRelativeLayout_listView.getLayoutParams();
                lp.setMargins(0, margin, 0, 0); percentRelativeLayout_listView.setLayoutParams(lp);
            }
        } //重置触摸起点位置，使触摸方向计算更加准确  initY = Y; //向下滑动  } else if (initY < Y && (Y - initY) > 5) { //获取原始Marin值  PercentRelativeLayout.LayoutParams params = (PercentRelativeLayout.LayoutParams) percentRelativeLayout_listView.getLayoutParams(); int downInitMargin = params.topMargin; //滑动后的位置  int currentMargin = Math.round(downInitMargin + (Y - initY)); if (downInitMargin - (initY - Y) > 0) {
            PercentRelativeLayout.LayoutParams lp = (PercentRelativeLayout.LayoutParams) percentRelativeLayout_listView.getLayoutParams();
            lp.setMargins(0, currentMargin, 0, 0); percentRelativeLayout_listView.setLayoutParams(lp);
        } //重置触摸起点位置，使触摸方向计算更加准确  initY = Y;
    }
}

以下是布局文件：

<?xml version="1.0" encoding="utf-8"?> <com.zhy.android.percent.support.PercentRelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  xmlns:app="http://schemas.android.com/apk/res-auto"  xmlns:tools="http://schemas.android.com/tools"  android:id="@+id/activity_main"  android:layout_width="match_parent"  android:layout_height="match_parent"  tools:context="com.aijiao.amap.myapplication.MainActivity"> <!--地图和抽屉开始-->  <com.zhy.android.percent.support.PercentRelativeLayout  android:id="@+id/percentRelativeLayout_amap"  android:layout_width="0dp"  android:layout_height="0dp"  app:layout_heightPercent="100%"  app:layout_widthPercent="100%"> <!--主地图开始-->  <com.zhy.android.percent.support.PercentRelativeLayout  android:layout_width="0dp"  android:layout_height="0dp"  android:background="@color/colorPrimary"  android:visibility="invisible"  app:layout_heightPercent="100%"  app:layout_widthPercent="100%"> <!--主地图布局-->   </com.zhy.android.percent.support.PercentRelativeLayout> <!--主地图结束-->  <!--小地图开始-->  <com.zhy.android.percent.support.PercentRelativeLayout  android:layout_width="0dp"  android:layout_height="0dp"  android:visibility="invisible"  app:layout_heightPercent="30%"  app:layout_widthPercent="100%"> <!--小地图布局-->   </com.zhy.android.percent.support.PercentRelativeLayout> <!--小地图结束-->   <!--抽屉开始-->  <com.zhy.android.percent.support.PercentRelativeLayout  android:id="@+id/percentRelativeLayout_listView"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:layout_marginTop="300dp"  android:background="@color/colorAccent"> <!--android:layout_marginTop="300dp"-->   <ImageView  android:id="@+id/imageView"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:layout_alignParentTop="true"  android:layout_centerHorizontal="true"  app:srcCompat="@drawable/up" />
        </com.zhy.android.percent.support.PercentRelativeLayout> <!--抽屉结束-->   </com.zhy.android.percent.support.PercentRelativeLayout> <!--地图和抽屉结束-->   </com.zhy.android.percent.support.PercentRelativeLayout>

Answer 1

其实就是事件的相应速度要比屏幕绘制要快，事件就是个简单的数据传递，而屏幕绘制涉及到硬件，要复杂缓慢得多。转发事件的时候可以wait一下，不要让事件发送过于频繁，太频繁，绘制那块，CPU、GPU也忙不过来，所以会有拖影现象了。

再就是下面这边文章的情况
http://blog.csdn.net/g475266696/article/details/7580969