Android拖放功能

概述有什么方法可以在API8Android中实现拖放功能？看起来为here,但它出现在API11之后.我需要将视图从一个LinearLayout拖到另一个.我如何在API8上实现此功能？解决方法:这样尝试importandroid.app.Activity;importandroid.content.ClipData;importandroid.graphics.Canvas;im

有什么方法可以在API 8 Android中实现拖放功能？

看起来为here,但它出现在API 11之后.

我需要将视图从一个linearLayout拖到另一个.我如何在API 8上实现此功能？

解决方法:

这样尝试

import androID.app.Activity;import androID.content.ClipData;import androID.graphics.Canvas;import androID.graphics.color;import androID.graphics.Paint;import androID.graphics.Point;import androID.graphics.Rect;import androID.os.Bundle;import androID.vIEw.DragEvent;import androID.vIEw.VIEw;import androID.vIEw.VIEw.DragShadowBuilder;import androID.vIEw.VIEw.OnDragListener;import androID.Widget.AdapterVIEw;import androID.Widget.AdapterVIEw.OnItemClickListener;import androID.Widget.ArrayAdapter;import androID.Widget.ListVIEw;import androID.Widget.TextVIEw;public class MainActivity extends Activity {ListVIEw source = null;TextVIEw target1 = null;TextVIEw target2 = null;TextVIEw target3 = null;String[] ListItems = {"Samsung", "Apple", "Google", "Nokia"};@OverrIDepublic voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    source = (ListVIEw)findVIEwByID(R.ID.dragSource);    target1 = (TextVIEw) findVIEwByID(R.ID.dragTarget1);    target2 = (TextVIEw) findVIEwByID(R.ID.dragTarget2);    target3 = (TextVIEw) findVIEwByID(R.ID.dragTarget3);    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, androID.R.layout.simple_List_item_1, ListItems);    source.setAdapter(adapter);    // Start Drag    source.setonItemClickListener(new OnItemClickListener() {        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent, VIEw vIEw, int position,                long ID) {            String item = ListItems[position];            ClipData data = ClipData.newPlainText("DragIt", item);            source.startDrag(data, new MyShadowBuilder(vIEw), null, 0);        }    });    // Handle Drag    target1.setonDragListener(new MyDragListener());    target2.setonDragListener(new MyDragListener());    target3.setonDragListener(new MyDragListener());}// Drag Shadowprivate class MyShadowBuilder extends DragShadowBuilder {    public MyShadowBuilder(VIEw v) {        super(v);    }    @OverrIDe    public voID onDrawShadow(Canvas canvas) {        // Set Drag image background or anything you want        int wIDth = getVIEw().getWIDth();        int height = getVIEw().getHeight();        Paint paint = new Paint();        paint.setcolor(0x55858585);        canvas.drawRect(new Rect(0, 0, wIDth, height), paint);        super.onDrawShadow(canvas);    }    @OverrIDe    public voID onProvIDeShadowMetrics(Point shadowSize,            Point shadowtouchPoint) {        int wIDth = getVIEw().getWIDth();        int height = getVIEw().getHeight();        shadowSize.set(wIDth, height);        shadowtouchPoint.set(wIDth/2, height);    }}// Drag Listenerprivate class MyDragListener implements OnDragListener {    private final int DEFAulT_BG_color = 0xFF858585;    private final int HIGHliGHT_BG_color = 0xFF0000FF;    @OverrIDe    public boolean onDrag(VIEw v, DragEvent event) {        if(event.getAction() == DragEvent.ACTION_DRAG_ENTERED) {            v.setBackgroundcolor(HIGHliGHT_BG_color);        }        else if(event.getAction() == DragEvent.ACTION_DRAG_EXITED) {            v.setBackgroundcolor(DEFAulT_BG_color);        }        else if(event.getAction() == DragEvent.ACTION_DROP) {            // Perform drop            ClipData clip = event.getClipData();            ClipData.Item item = clip.getItemAt(0);            String text = item.getText().toString();            ((TextVIEw) v).setText(text);            v.setBackgroundcolor(DEFAulT_BG_color);        }        // Send true to Listen All Drag Events.        return true;     }}}

XML就像：

<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"androID:layout_wIDth="fill_parent"androID:layout_height="fill_parent"androID:orIEntation="horizontal" ><linearLayout    androID:layout_wIDth="161dp"    androID:layout_height="fill_parent"    androID:background="#FF858585"    androID:orIEntation="vertical" >    <TextVIEw        androID:ID="@+ID/dragTarget1"        androID:layout_wIDth="fill_parent"        androID:layout_height="wrap_content"        androID:layout_weight="0.04"        androID:text="Drop Here"        androID:textAppearance="?androID:attr/textAppearanceLarge" />    <TextVIEw        androID:ID="@+ID/dragTarget2"        androID:layout_wIDth="fill_parent"        androID:layout_height="wrap_content"        androID:layout_weight="0.04"        androID:text="Drop Here"        androID:textAppearance="?androID:attr/textAppearanceLarge" />    <TextVIEw        androID:ID="@+ID/dragTarget3"        androID:layout_wIDth="fill_parent"        androID:layout_height="wrap_content"        androID:layout_weight="0.04"        androID:text="Drop Here"        androID:textAppearance="?androID:attr/textAppearanceLarge" /></linearLayout><linearLayout    androID:layout_wIDth="wrap_content"    androID:layout_height="fill_parent"    androID:orIEntation="vertical" >    <ListVIEw        androID:ID="@+ID/dragSource"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content" >    </ListVIEw></linearLayout>

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