代码：

Question

我有两个列表视图。我想从一个列表视图中拖动一个项目并放在另一个列表视图上的特定位置。我怎样才能做到这一点。这是我的布局。

 <LinearLayout
                android:id="@+id/parentLayout"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"
                android:weightSum="3" >

                <LinearLayout
                    android:id="@+id/vert1"
                    android:layout_width="0dip"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/bg_shadowed_frame"
                    android:gravity="center_horizontal"
                    android:orientation="vertical"
                    android:padding="15dip" >

                    <TextView
                        android:id="@+id/tv1"
                        style="@style/TextViewMedStyleShadowWhite"
                        android:layout_width="wrap_content"
                        android:layout_height="30dip"
                        android:text="LIST 1"
                        android:textColor="@color/theme_blue" />

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dip"
                        android:layout_marginLeft="20dip"
                        android:layout_marginRight="20dip"
                        android:layout_marginTop="5dip"
                        android:background="@color/theme_blue" />

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" >

                        <ListView
                            android:id="@+id/listView1"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:divider="@null"
                            android:paddingLeft="10dip"
                            android:paddingRight="10dip" />

                        <ProgressBar
                            android:id="@+id/progres1"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerInParent="true"
                            android:indeterminate="true" />
                    </RelativeLayout>
                </LinearLayout>

                <LinearLayout
                    android:id="@+id/vert2"
                    android:layout_width="0dip"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    android:background="@drawable/bg_shadowed_frame"
                    android:gravity="center_horizontal"
                    android:orientation="vertical"
                    android:padding="15dip" >

                    <RelativeLayout
                        android:layout_width="match_parent"
                        android:layout_height="wrap_content"
                        android:orientation="horizontal"
                        android:paddingLeft="15dip"
                        android:paddingRight="15dip" >

                        <TextView
                            android:id="@+id/tv1"
                            style="@style/TextViewMedStyleShadowWhite"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerHorizontal="true"
                            android:layout_centerVertical="true"
                            android:text="LIST 2"
                            android:textColor="@color/theme_blue" />

                        <ImageButton
                            android:id="@+id/addButton"
                            android:layout_width="30dip"
                            android:layout_height="30dip"
                            android:layout_alignParentRight="true"
                            android:background="@null"
                            android:scaleType="fitCenter"
                            android:src="@drawable/ic_mini_add" />
                    </RelativeLayout>

                    <View
                        android:layout_width="match_parent"
                        android:layout_height="1dip"
                        android:layout_marginLeft="20dip"
                        android:layout_marginRight="20dip"
                        android:layout_marginTop="5dip"
                        android:background="@color/theme_blue" />

                    <RelativeLayout
                        android:layout_width="wrap_content"
                        android:layout_height="wrap_content" >

                        <ListView
                            android:id="@+id/listView2"
                            android:layout_width="wrap_content"
                            android:layout_height="match_parent"
                            android:divider="@null"
                            android:paddingLeft="10dip"
                            android:paddingRight="10dip" />

                        <ProgressBar
                            android:id="@+id/progres2"
                            android:layout_width="wrap_content"
                            android:layout_height="wrap_content"
                            android:layout_centerInParent="true"
                            android:indeterminate="true" />
                    </RelativeLayout>
                </LinearLayout>
      </LinearLayout>

这里我有两个ListView。现在我的长按一下监听器我隐藏了点击的项目

listView2.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
                View selectedView = listView2.getChildAt(arg2);
                selectedView.setVisibility(View.INVISIBLE);
                mCellIsMobile = true;

                return false;
            }
        });


listView2.setOnTouchListener(new View.OnTouchListener() {

                @Override
                public boolean onTouch(View v, MotionEvent event) {

                    int xPos = (int)event.getX();
                    int yPos = (int)event.getY();
                    Log.i("Touched","ListView2"+xPos+" , "+yPos);

                    parentLayout.requestDisallowInterceptTouchEvent(false);
                    parentLayout.onInterceptTouchEvent(event);

                    return false;
                }
            });

同样，parentLayout也有触摸侦听器，但是当孩子消耗它时触摸永远不会到达父节点。

 parentLayout.setOnTouchListener(new OnTouchListener() {

            @Override
            public boolean onTouch(View v, MotionEvent event) {

                int xPos = (int)event.getX();
                int yPos = (int)event.getY();
                Log.i("Touched","Parent"+xPos+" , "+yPos);
   return false;
            }
        });

Answer 1

以下代码中唯一的问题是：You want to drop item at a SPECIFIC place on second listview及以下代码只将其添加到第二个列表的END或列表的开头。

Basically the problem is I can't find the exact position where you will be dropping the item on 2nd ListView.如果你能找到，那么用该值替换POSITION_TO_DROP变量。

 int POSITION_TO_DROP = 0;
 droppedList.add(POSITION_TO_DROP, droppedItem);

或者只是在第二个Listview结尾处使用它来添加

 droppedList.add(droppedItem);

查看这些图片

Dragging

和Drop后，它将添加到第二个列表的开头。

And After Droping

代码：

 //onCreate Start
    targetLayout = (LinearLayout) findViewById(R.id.targetlayout);
    listSource = (ListView) findViewById(R.id.sourcelist);
    listTarget = (ListView) findViewById(R.id.targetlist);
    comments = (TextView) findViewById(R.id.comments);

    // Create and set the tags for the Buttons

    final String SOURCELIST_TAG = "listSource";
    final String TARGETLIST_TAG = "listTarget";
    final String TARGETLAYOUT_TAG = "targetLayout";

    listSource.setTag(SOURCELIST_TAG);
    listTarget.setTag(TARGETLIST_TAG);
    targetLayout.setTag(TARGETLAYOUT_TAG);

    listSource.setAdapter(new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, month));
    listSource.setOnItemLongClickListener(listSourceItemLongClickListener);

    droppedList = new ArrayList<String>();
    droppedAdapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_list_item_1, droppedList);
    listTarget.setAdapter(droppedAdapter);

    listSource.setOnDragListener(myDragEventListener);
    targetLayout.setOnDragListener(myDragEventListener);

   // OnCreate End


    OnItemLongClickListener listSourceItemLongClickListener = new OnItemLongClickListener() {

    @Override
    public boolean onItemLongClick(AdapterView<?> l, View v, int position,
            long id) {

        // Selected item is passed as item in dragData
        ClipData.Item item = new ClipData.Item(month[position]);

        String[] clipDescription = { ClipDescription.MIMETYPE_TEXT_PLAIN };
        ClipData dragData = new ClipData((CharSequence) v.getTag(),
                clipDescription, item);
        DragShadowBuilder myShadow = new MyDragShadowBuilder(v);

        v.startDrag(dragData, // ClipData
                myShadow, // View.DragShadowBuilder
                month[position], // Object myLocalState
                0); // flags

        commentMsg = v.getTag() + " : onLongClick.\n";
        comments.setText(commentMsg);

        return true;
    }
};

private static class MyDragShadowBuilder extends View.DragShadowBuilder {
    private static Drawable shadow;

    public MyDragShadowBuilder(View v) {
        super(v);
        shadow = new ColorDrawable(Color.LTGRAY);
    }

    @Override
    public void onProvideShadowMetrics(Point size, Point touch) {
        int width = getView().getWidth();
        int height = getView().getHeight();

        shadow.setBounds(0, 0, width, height);
        size.set(width, height);
        touch.set(width / 2, height / 2);
    }

    @Override
    public void onDrawShadow(Canvas canvas) {
        shadow.draw(canvas);
    }

}

protected class MyDragEventListener implements View.OnDragListener {

    @Override
    public boolean onDrag(View v, DragEvent event) {
        final int action = event.getAction();

        switch (action) {
        case DragEvent.ACTION_DRAG_STARTED:
            // All involved view accept ACTION_DRAG_STARTED for
            // MIMETYPE_TEXT_PLAIN
            if (event.getClipDescription().hasMimeType(
                    ClipDescription.MIMETYPE_TEXT_PLAIN)) {
                commentMsg += v.getTag()
                        + " : ACTION_DRAG_STARTED accepted.\n";
                comments.setText(commentMsg);
                return true; // Accept
            } else {
                commentMsg += v.getTag()
                        + " : ACTION_DRAG_STARTED rejected.\n";
                comments.setText(commentMsg);
                return false; // reject
            }
        case DragEvent.ACTION_DRAG_ENTERED:
            commentMsg += v.getTag() + " : ACTION_DRAG_ENTERED.\n";
            comments.setText(commentMsg);
            return true;
        case DragEvent.ACTION_DRAG_LOCATION:
            commentMsg += v.getTag() + " : ACTION_DRAG_LOCATION - "
                    + event.getX() + " : " + event.getY() + "\n";
            comments.setText(commentMsg);
            return true;
        case DragEvent.ACTION_DRAG_EXITED:
            commentMsg += v.getTag() + " : ACTION_DRAG_EXITED.\n";
            comments.setText(commentMsg);
            return true;
        case DragEvent.ACTION_DROP:
            // Gets the item containing the dragged data
            ClipData.Item item = event.getClipData().getItemAt(0);

            commentMsg += v.getTag() + " : ACTION_DROP" + "\n";
            comments.setText(commentMsg);

            // If apply only if drop on buttonTarget
            if (v == targetLayout) {
                String droppedItem = item.getText().toString();

                commentMsg += "Dropped item - " + droppedItem + "\n";
                comments.setText(commentMsg);

                int POSITION_TO_DROP = 0;
                droppedList.add(POSITION_TO_DROP, droppedItem);

                droppedAdapter.notifyDataSetChanged();

                return true;
            } else {
                return false;
            }

        case DragEvent.ACTION_DRAG_ENDED:
            if (event.getResult()) {
                commentMsg += v.getTag()
                        + " : ACTION_DRAG_ENDED - success.\n";
                comments.setText(commentMsg);
            } else {
                commentMsg += v.getTag() + " : ACTION_DRAG_ENDED - fail.\n";
                comments.setText(commentMsg);
            }
            ;
            return true;
        default: // unknown case
            commentMsg += v.getTag() + " : UNKNOWN !!!\n";
            comments.setText(commentMsg);
            return false;

        }
    }
}

在此检查完整项目=＆gt; Drag and Drop Between 2 ListViews

ListView拖放

1 个答案:

代码：