在这里,我有一个由多个 fragment 共享的 View 寻呼机,这些 fragment 都包含在一个 TABLayout 中,如下所示
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android">
<android.support.v7.widget.Toolbar
android:id="@+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="#006699"
android:titleTextColor="#FFFFFF"
app:popupTheme="@style/AppTheme.PopupOverlay" />
<android.support.design.widget.TabLayout
android:id="@+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/toolbar"
android:background="#006699"
android:elevation="6dp"
android:minHeight="?attr/actionBarSize"
android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"
android:layout_below="@id/tab_layout"/>
<android.support.design.widget.FloatingActionButton
android:id="@+id/order_icon"
android:layout_width="59dp"
android:layout_height="59dp"
android:visibility="visible"
android:layout_gravity="right|bottom"
app:layout_anchor="@id/pager"
app:layout_anchorGravity="bottom|right|end"
android:src="@drawable/order_icon"
android:layout_alignBottom="@+id/pager"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true" />
</RelativeLayout>
FAB 由所有 fragment 共享。我想在 FAB 上添加一个 onLongClicklistener,通过它我可以将按钮拖到布局(包括 viewPager)上。 我已经使用 onTouchListener 和 MotionEvent 对象完成了上述任务。 但是,我无法使用拖放 API 执行此操作(释放拖动的按钮后,按钮消失)。
代码如下:
orderIcon = (FloatingActionButton)findViewById(R.id.order_icon);
orderIcon.setTag(IMAGEVIEW_TAG);
// Sets a long click listener for the ImageView
orderIcon.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
ClipData.Item item = new ClipData.Item((CharSequence) v
.getTag());
String[] mimeTypes = { ClipDescription.MIMETYPE_TEXT_PLAIN };
ClipData clipData = ClipData.newPlainText("", "");
View.DragShadowBuilder myShadow = new View.DragShadowBuilder(view);
// Starts the drag
v.startDrag(clipData,myShadow,null,0);
return true;
}
});
orderIcon.setOnDragListener(new View.OnDragListener() {
@SuppressLint("NewApi")
@Override
public boolean onDrag(View v, DragEvent event) {
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
owner = (ViewGroup) v.getParent();
owner.removeView(v);
Log.d(msg, "Action is DragEvent.ACTION_DRAG_STARTED");
break;
case DragEvent.ACTION_DRAG_ENTERED:
Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENTERED");
float x = (int) event.getX();
float y = (int) event.getY();
break;
case DragEvent.ACTION_DRAG_EXITED:
Log.d(msg, "Action is DragEvent.ACTION_DRAG_EXITED");
x = (float) event.getX();
y = (float) event.getY();
v.setX(x);
v.setY(y);
owner.addView(v);
v.setVisibility(View.VISIBLE);
break;
case DragEvent.ACTION_DRAG_LOCATION:
Log.d(msg, "Action is DragEvent.ACTION_DRAG_LOCATION");
break;
case DragEvent.ACTION_DRAG_ENDED:
Log.d(msg, "Action is DragEvent.ACTION_DRAG_ENDED");
break;
case DragEvent.ACTION_DROP:
Log.d(msg, "ACTION_DROP event");
break;
default:
break;
}
return true;
}
});
如有任何回应,我们将不胜感激。提前谢谢你。
最佳答案
试试这个,
1) 声明变量。
float dX;
float dY;
int lastAction;
2) 在你的 java 类中获取 View ,
fab = (FloatingActionButton) findViewById(R.id.floatingActionButton);
3) 然后为你的 View 编写如下代码,
fab.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View view, MotionEvent event) {
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
dX = view.getX() - event.getRawX();
dY = view.getY() - event.getRawY();
lastAction = MotionEvent.ACTION_DOWN;
break;
case MotionEvent.ACTION_MOVE:
view.setY(event.getRawY() + dY);
view.setX(event.getRawX() + dX);
lastAction = MotionEvent.ACTION_MOVE;
break;
case MotionEvent.ACTION_UP:
if (lastAction == MotionEvent.ACTION_DOWN)
Toast.makeText(this, "Clicked!", Toast.LENGTH_SHORT).show();
break;
default:
return false;
}
return true;
}
});
关于android - 如何将 float 操作按钮拖到 View 寻呼机上,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35659645/