如何使的LinearLayout TextView的拖累流畅,在Android的? [英] How to make the TextView drag in LinearLayout smooth, in android?
问题描述
我有这种情况,我不能够解决,希望我会得到一些建议你。
I have a situation which I am not able to fix, hopefully I will get some advises from you.
这种情况很简单:我有一个的LinearLayout中,我有一个多行文本的一个TextView。用户能够直到他找到他喜欢的位置上的TextView拖动左右。什么是真正重要的是,TextView的可部分出的LinearLayout的(它会出现下调)。
The situation is simple: I have a LinearLayout in which I have a TextView with multiple lines of text. The user is able to drag the TextView around until he finds a position he likes. What is really important is that the TextView can be partially out of the LinearLayout (it will appear cut).
下面是一些code样品:</ P>
Here are some code samples:
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top|center_horizontal"
android:clipChildren="false"
android:gravity="center_horizontal|center_vertical"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:gravity="center"
android:textColor="@color/text_color"
android:textSize="16sp" />
</LinearLayout>
正如你所看到的LinearLayout有clipChildren =假,让文字截止。 对于TextView中我设置一个触摸监听器
As you can see the LinearLayout has clipChildren = false to allow cutoff of text. For the textview I set a touch listener
txt.setOnTouchListener(new View.OnTouchListener() {
int initialX = 0;
int initialY = 0;
@Override
public boolean onTouch(View v, MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
initialX = (int) event.getX();
initialY = (int) event.getY();
break;
case MotionEvent.ACTION_MOVE:
int currentX = (int) event.getX();
int currentY = (int) event.getY();
LinearLayout.LayoutParams lp = (LinearLayout.LayoutParams) txt.getLayoutParams();
int left = lp.leftMargin + (currentX - initialX);
int top = lp.topMargin + (currentY - initialY);
int right = lp.rightMargin - (currentX - initialX);
int bottom = lp.bottomMargin - (currentY - initialY);
lp.rightMargin = right;
lp.leftMargin = left;
lp.bottomMargin = bottom;
lp.topMargin = top;
txt.setLayoutParams(lp);
break;
default:
break;
}
return true;
}
});
这里是我的问题:正如你看到的,我已经将所有的布局参数(右,左,下,上边距)。这是为什么呢?
And here is my problem: As you can see I've set all the layout parameters (right, left, bottom, top margins). Why is that ?
1)如果我只用左/上方的阻力是足够多的,但流畅的文字获取的包裹在适当的边界,而不是获得晋级。可能是由于右0边距值。
1) If I use only left/top the drag is smooth enought but text get's wrapped at the right border instead of getting cut. Probably due to right 0 margin value.
2)如果我使用所有的利润,文本被切断,因为我想要的,但运动不顺畅,它只是跳绕了几个像素。
2) If I use all margins, the text gets cut as I want, but the movement is not smooth, it just jumps around for a few pixels.
我该如何解决这个问题?
How can I fix this ?
推荐答案
嘛。这是奇怪的。通过插入的TextView内的另一个的LinearLayout具有相同大小作为初始一体,使一切顺利。我不知道为什么。
Well. this is weird. By inserting the TextView inside another LinearLayout with the same size as the initial one, makes everything smooth. I have no idea why.
这篇关于如何使的LinearLayout TextView的拖累流畅,在Android的?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!