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我想在我的測試應用中向文本視圖添加拖放功能 主佈局包含一個相關佈局(RL1),其中inturn包含另外的RelativeLayout(RL2) 現在RL2包含可以能夠拖動並隨時隨地下降拖放視圖:即使拖動到新位置後仍然返回到原始位置
但是,當我在其倒拖,但去TextView的執行拖我放棄它,它返回到其originsl位置一個TextView 請幫我
我mainactivity
public class MainActivity extends Activity
{
TextView tv;
LayoutParams lParams;
RelativeLayout layout;
private static final String Tv_TAG =" TV_DRAG";
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.mainTextView1);
tv.setTag(Tv_TAG);
tv.setOnTouchListener(new MyTouchListener());
layout = (RelativeLayout) findViewById(R.id. draggableRelativeLayout);
layout.setOnDragListener(new MyDragListener());
}
private class MyTouchListener implements OnTouchListener
{
@Override
public boolean onTouch(View v, MotionEvent event)
{
ClipData.Item item = new ClipData.Item((CharSequence) v.getTag());
String[] mimeTypes ={ClipDescription.MIMETYPE_TEXT_PLAIN};
ClipData dragData = new ClipData(v.getTag().toString(), mimeTypes, item);
View.DragShadowBuilder shdwbldr = new View.DragShadowBuilder(v);
v.startDrag(dragData, shdwbldr, v, 0);
v.setVisibility(View.INVISIBLE);
return true;
}
}
private class MyDragListener implements OnDragListener
{
@Override
public boolean onDrag(View v, DragEvent event)
{
View view = (View) event.getLocalState();
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
lParams =(RelativeLayout.LayoutParams)view.getLayoutParams();
break;
case DragEvent.ACTION_DRAG_ENTERED:
int x_cord = (int) event.getX();
int y_cord = (int) event.getY();
break;
case DragEvent.ACTION_DRAG_EXITED:
x_cord = (int) event.getX();
y_cord = (int) event.getY();
lParams.leftMargin = x_cord;
lParams.topMargin = y_cord;
view.setLayoutParams(lParams);
break;
case DragEvent.ACTION_DROP:
// Dropped, reassign View to ViewGroup
ViewGroup owner = (ViewGroup) view.getParent();
owner.removeView(view);
RelativeLayout container = (RelativeLayout) v;
container.addView(view);
view.setVisibility(View.VISIBLE);
break;
case DragEvent.ACTION_DRAG_ENDED:
break;
default: break;
}
return true;
}
}
}
**我的佈局**
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:background="#AE9C9B"
android:id="@+id/ draggableRelativeLayout ">
<RelativeLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="@null"
android:id="@+id/mainRelativeLayout1">
<TextView
android:layout_height="wrap_content"
android:text="DRAG ME"
android:textAppearance="?android:attr/textAppearanceLarge"
android:layout_width="wrap_content"
android:layout_margin="10dp"
android:id="@+id/mainTextView1"/>
</RelativeLayout>
理解代碼你正在使用,並閱讀你拖動的'View.Shadow'。視圖隱藏,陰影正在移動。 [閱讀正在使用的文檔](https://developer.android.com/guide/topics/ui/drag-drop.html)。 – Bonatti
@Bonatti你能否詳細說明我的錯誤 – user5894647
你不會將新座標設置爲拖動視圖。 – yennsarah