Android 如何使用 View.OnTouchListener 而不是 onClick
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How to use View.OnTouchListener instead of onClick
提问by VansFannel
I'm developing an Android 2.2.2 application for a client and he wants to do the following:
我正在为客户开发一个 Android 2.2.2 应用程序，他想执行以下操作：
Now I have a button with an onClick event but he doesn't like, he wants to dectect when user release the button.
现在我有一个带有 onClick 事件的按钮，但他不喜欢，他想检测用户何时释放按钮。
I've found View.OnTouchListenerwhich I think this is what I need to use but, is there any posibility to add this event to xml like I did with onClick?
我找到了View.OnTouchListener，我认为这是我需要使用的，但是，是否有可能像使用 onClick 那样将此事件添加到 xml 中？
<ImageButton
android:id="@+id/btnSaveNewGate"
android:layout_width="@dimen/btnSaveNewGate_width"
android:layout_height="@dimen/btnSaveNewGate_height"
android:layout_below="@+id/radioGrGateType"
android:layout_centerHorizontal="true"
android:layout_marginTop="@dimen/btnSaveNewGate_marginTop"
android:background="@null"
android:contentDescription="@string/layout_empty"
android:onClick="onSaveNewGateClick"
android:scaleType="fitXY"
android:src="@drawable/save_gate_selector" />
I have two questions more:
我还有两个问题：
Which is the event associated when user releases his finger?
用户松开手指时关联的事件是什么？
Is there any guidelines which prohibit using View.OnTouchListenerinstead of onClick?
是否有任何准则禁止使用View.OnTouchListener代替onClick？
回答by Andy Res
The event when user releases his finger is MotionEvent.ACTION_UP. I'm not aware if there are any guidelines which prohibit using View.OnTouchListener instead of onClick(), most probably it depends of situation.
用户松开手指的事件是MotionEvent.ACTION_UP。我不知道是否有任何准则禁止使用 View.OnTouchListener 而不是 onClick()，这很可能取决于具体情况。
Here's a sample code:
这是一个示例代码：
imageButton.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if(event.getAction() == MotionEvent.ACTION_UP){
// Do what you want
return true;
}
return false;
}
});
回答by Suragch
Presumably, if one wants to use an OnTouchListenerrather than an OnClickListener, then the extra functionality of the OnTouchListeneris needed. This is a supplemental answer to show more detail of how an OnTouchListenercan be used.
据推测，如果想要使用 anOnTouchListener而不是 an OnClickListener，则需要 的额外功能OnTouchListener。这是一个补充答案，以显示有关如何OnTouchListener使用a 的更多详细信息。
Define the listener
定义监听器
Put this somewhere in your activity or fragment.
把它放在你的活动或片段中的某个地方。
private View.OnTouchListener handleTouch = new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
int x = (int) event.getX();
int y = (int) event.getY();
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
Log.i("TAG", "touched down");
break;
case MotionEvent.ACTION_MOVE:
Log.i("TAG", "moving: (" + x + ", " + y + ")");
break;
case MotionEvent.ACTION_UP:
Log.i("TAG", "touched up");
break;
}
return true;
}
};
Set the listener
设置监听器
Set the listener in onCreate(for an Activity) or onCreateView(for a Fragment).
将侦听器设置为onCreate（对于活动）或onCreateView（对于片段）。
myView.setOnTouchListener(handleTouch);
Notes
笔记
getXandgetYgive you the coordinates relative to the view (that is, the top left corner of the view). They will be negative when moving above or to the left of your view. UsegetRawXandgetRawYif you want the absolute screen coordinates.- You can use the
xandyvalues to determine things like swipe direction.
getX并getY为您提供相对于视图的坐标（即视图的左上角）。在您的视图上方或左侧移动时，它们将为负值。如果您想要绝对屏幕坐标，请使用getRawX和getRawY。- 您可以使用
x和y值来确定诸如滑动方向之类的事情。
回答by CaseyB
OnClick is triggered when the user releases the button. But if you still want to use the TouchListener you need to add it in code. It's just:
当用户释放按钮时触发 OnClick。但是，如果您仍想使用 TouchListener，则需要在代码中添加它。只是：
myView.setOnTouchListener(new View.OnTouchListener()
{
// Implementation;
});
回答by RahimpoorDeveloper
for use sample touch listener just you need this code
要使用示例触摸侦听器，您只需要此代码
@Override
public boolean onTouch(View view, MotionEvent motionEvent) {
ClipData data = ClipData.newPlainText("", "");
View.DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(view);
view.startDrag(data, shadowBuilder, null, 0);
return true;
}
