如何在父视图的触摸侦听器中使用子视图的触摸事件? [英] How to consume child view's touch event in parent view's touchlistener?
问题描述
在我的应用程序中，我想获取父视图 onTouchListener 中所有子视图的触摸事件，但我无法获取.
In my application I want to get the touch event of all child view's in my parent view's onTouchListener but I could not get this.
示例:
在我的活动视图中，我有一个框架布局，其中包含一些按钮和编辑文本.因此，每当我触摸按钮或编辑文本时，我都希望在 framlayout's onTouchListeners 中获得此触摸事件.
In my activity's view I have one frame layout which has some buttons and edittexts in it. So whenever I touch buttons or edit text I want to get this touch event in framlayout's onTouchListeners.
这是我的代码..
活动:
private FrameLayout rootView;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
rootView = (FrameLayout) findViewById(R.id.rootview);
rootView.setOnTouchListener(new OnTouchListener()
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
Log.e("Touch Event: ", " X: " + event.getX() + " Y: " + event.getY());
return false;
}
});
}
main.xml:
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:id="@+id/rootview">
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:background="@android:color/white"
android:orientation="vertical"
android:layout_gravity="center"
android:padding="10dip">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="4dp"
android:text="Login"
android:textColor="@android:color/black"
android:textSize="16dp"
android:textStyle="bold" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="Username"
android:textColor="@android:color/black"
android:textSize="14dp"
android:textStyle="bold" />
<EditText
android:id="@+id/edttextusername"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:imeOptions="flagNoExtractUi"
android:singleLine="true" />
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:text="Password"
android:textColor="@android:color/black"
android:textSize="14dp"
android:textStyle="bold" />
<EditText
android:id="@+id/edttextpassword"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:imeOptions="flagNoExtractUi"
android:password="true" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:gravity="center"
android:orientation="horizontal"
android:padding="10dp" >
<Button
android:id="@+id/btnlogin"
android:layout_width="0dip"
android:layout_height="40dip"
android:layout_marginRight="5dp"
android:layout_weight="1"
android:enabled="false"
android:text="Login"
android:padding="5dip"
android:textColor="@android:color/black"
android:textStyle="bold"
/>
<Button
android:id="@+id/btncall"
android:layout_width="0dip"
android:layout_height="40dip"
android:layout_marginLeft="5dp"
android:layout_weight="1"
android:padding="5dip"
android:text="Cancel"
android:textColor="@android:color/black"
android:textStyle="bold" />
</LinearLayout>
</LinearLayout>
</FrameLayout>
问题:因此，每当我触摸按钮或编辑文本时，我都无法在框架布局的 onTouchListener(未调用)中获得触摸协调.
Problem: So whenver I touch the buttons or edittext I can't get touch co-ordition in my frame layout's onTouchListener (It's not called).
注意:我不想为所有 childView 添加单独的 onTouchListener.
Note: I don't want to add separate onTouchListener for all childViews.
提前致谢.
推荐答案
您可以通过覆盖 dispatchTouchEvent 在布局中.
You could accomplish that by overriding dispatchTouchEvent in the layout.
public class MyFrameLayout extends FrameLayout {
@Override
public boolean dispatchTouchEvent(MotionEvent e) {
// do what you need to with the event, and then...
return super.dispatchTouchEvent(e);
}
}
然后使用该布局代替通常的 FrameLayout:
Then use that layout in place of the usual FrameLayout:
<com.example.android.MyFrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:padding="10dip"
android:id="@+id/rootview">
...
如果您需要阻止子视图接收事件，您也可以完全跳过超级调用，但我认为这种情况很少见.如果您需要重新创建一些(但不是全部)默认功能，则有很多需要重写:
You could also skip the super call entirely if you need to prevent child views from receiving the event, but I think this would be rare. If you need to recreate some, but not all, of the default functionality, there is a lot to rewrite:
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