我遇到了罕见的行为，我无法弄清楚原因。
我实现了一个具有视差效果和自定义“on-pull-update”的渐弱动作栏。所有这些效果都与图像标题的高度和位置一起发挥，产生了视差和bouncinnes的感觉。
一切正常但是在几次播放之后，上下移动，图像标题的线性布局不会刷新o反映高度变化，即使我从事件中记录监听器和大小/位置/ alpha计算也能正常工作。 / p>
是否有一些东西丢失，阻止视图多次刷新？
自从昨天以来我就一直在努力争取这个问题，而且我真的会指出任何帮助或方向或任何指示。提前致谢！
在我的主要课程下面，我从一个自定义的“ObservableActionBar”中继承，它只会覆盖onScroll函数，通过一个简单的界面添加一个监听器，它需要5个参数。
public class ActivityTest extends Activity{
private Drawable mActionBarBackgroundDrawable;
//PARALLAX
private float scale;
private boolean isGoingDownOnCero = false;
private float onDownY = 0;
private float distanceY = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_activity_test);
mActionBarBackgroundDrawable = getResources().getDrawable(R.drawable.ab_background);
mActionBarBackgroundDrawable.setAlpha(0);
getActionBar().setBackgroundDrawable(mActionBarBackgroundDrawable);
scale = getBaseContext().getResources().getDisplayMetrics().density;
((ObservableScrollView) findViewById(R.id.scroll_test))
.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
isGoingDownOnCero = true;
onDownY = event.getY();
break;
case MotionEvent.ACTION_UP:
isGoingDownOnCero = false;
((View) findViewById(R.id.anchor)).setLayoutParams(
new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
(int)(255 * scale)
)
);
break;
case MotionEvent.ACTION_MOVE :
distanceY = (event.getY() - onDownY) / 2;
default:
break;
}
return false;
}
});
((ObservableScrollView) findViewById(R.id.scroll_test))
.setScrollViewListener(new ScrollViewListener() {
@Override
public void onScrollChanged(ObservableScrollView scrollView, int x, int y,
int oldx, int oldy) {
int headerHeight = findViewById(R.id.image_header).getHeight() - getActionBar().getHeight();
float ratio = (float) Math.min(Math.max(y, 0), headerHeight) / headerHeight;
int newAlpha = (int) (ratio * 255);
mActionBarBackgroundDrawable.setAlpha(newAlpha);
getActionBar().setBackgroundDrawable(mActionBarBackgroundDrawable);
//findViewById(R.id.image_header).offsetTopAndBottom( - offset);
int cantRedrawSize = (int)(
((int)(y * scale) / 2) < ( (int)(255 * scale) / 2) ?
(int)(y * scale) / 2 :
((int)(255 * scale) / 2) );
Log.v("REDRAW SIZE", cantRedrawSize + "");
Log.v("Linear SIZE", ((View) findViewById(R.id.anchor)).getHeight() + "");
((View) findViewById(R.id.anchor)).setLayoutParams(
new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
(255 * scale) - cantRedrawSize > 0 ? (int)((255 * scale) - cantRedrawSize) : 0
)
);
if(isGoingDownOnCero && y == oldy && y == 0){
((View) findViewById(R.id.anchor)).setLayoutParams(
new RelativeLayout.LayoutParams(
LayoutParams.MATCH_PARENT,
(int)(255 * scale) + ( distanceY > 0 ? distanceY < 200 ? (int)distanceY : 200 : 0)
)
);
}
((View) findViewById(R.id.anchor)).requestLayout();
}
});
}
}
我的布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.noche.quepasoanoche.ActivityTest" >
<com.example.CLASS.ObservableScrollView
android:id="@+id/scroll_test"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_weight="1" >
<FrameLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<LinearLayout
android:background="#000"
android:orientation="vertical"
android:id="@+id/anchor"
android:layout_width="match_parent"
android:layout_height="255dp" >
<ImageView
android:id="@+id/image_header"
android:layout_width="wrap_content"
android:layout_height="400dp"
android:adjustViewBounds="true"
android:scaleType="centerCrop"
android:src="@drawable/bg_home" />
</LinearLayout>
<LinearLayout
android:id="@+id/item_lista"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@id/anchor"
android:background="#000"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="5dp"
android:background="#e4e4e4" >
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</FrameLayout>
</com.example.CLASS.ObservableScrollView>
它看起来如何。
答案 0 :(得分：0)
在((View) findViewById(R.id.anchor)).requestLayout();函数中调用此onTouch：
