這兩天自己baidu+google，簡單解決了一些問題，暫且先貼上來。

因為是我的一個作業，所以還有一些按鈕的點擊事件，大家可以忽略。

這些源碼僅僅實現了簡單的”將制定控件拖拽到某個區域“，還沒有實現”拖拽到指定位置“，后續解決了之后會在貼上來

package com.example.alpha.app2_4;

import android.app.Activity;

import android.content.ClipData;

import android.content.ClipDescription;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Point;

import android.graphics.drawable.ColorDrawable;

import android.graphics.drawable.Drawable;

import android.os.Bundle;

import android.util.Log;

import android.view.DragEvent;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.AdapterView;

import android.widget.AdapterView.OnItemClickListener;

import android.widget.ArrayAdapter;

import android.widget.Button;

import android.widget.LinearLayout;

import android.widget.ListView;

import android.widget.Toast;

import java.util.ArrayList;

import java.util.Arrays;

public class MainActivity extends Activity implements OnClickListener {

ListView lv1;

ListView lv2;

LinearLayout targetLayout,fromLayout;

ArrayAdapter arr_Adapter;

ArrayAdapterarr_Adapter2;

Button bt1;

Button bt2;

Button bt3;

Button bt4;

Button bt5;

Button bt6;

static int po_l = 0,po_r=0;

ArrayListarr_data1=new ArrayList(Arrays.asList("上海",

"南京", "武漢", "北京", "重慶", "深圳", "蘭州", "沈陽") );

ArrayList arr_data2;

static Boolean flag=true;//定義左右標志

static int longClick_Flag;//定義長按左右標志

//實例化拖拽項目監聽器

MyDragEventListener myDragEventListener=new MyDragEventListener();

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

bt1 = (Button) findViewById(R.id.button1);

bt2 = (Button) findViewById(R.id.button2);

bt3 = (Button) findViewById(R.id.button3);

bt4 = (Button) findViewById(R.id.button4);

bt5 = (Button) findViewById(R.id.button5);

bt6 = (Button) findViewById(R.id.button6);

lv1 = (ListView) findViewById(R.id.listView1);

lv2 = (ListView) findViewById(R.id.listView2);

bt1.setOnClickListener(this);

bt2.setOnClickListener(this);

bt3.setOnClickListener(this);

bt4.setOnClickListener(this);

bt5.setOnClickListener(this);

bt6.setOnClickListener(this);

arr_Adapter = new ArrayAdapter(this,

android.R.layout.simple_list_item_1, arr_data1);

lv1.setAdapter(arr_Adapter);

lv1.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView> parent, View view,

int position, long id) {

po_l=position;

flag=true;//true即點擊了lv1

Log.d("tag", "po_l="+po_l);

}

});

arr_data2=new ArrayList();

arr_Adapter2=new ArrayAdapter(this, android.R.layout.simple_list_item_1,arr_data2);

lv2.setAdapter(arr_Adapter2);

lv2.setOnItemClickListener(new OnItemClickListener() {

@Override

public void onItemClick(AdapterView> parent, View view, int position, long id) {

po_r=position;

flag=false;//false即點擊了lv2

}

});

/**

* Drag_Start

*/

targetLayout= (LinearLayout) findViewById(R.id.TargetLayout);

fromLayout= (LinearLayout) findViewById(R.id.FromLayout);

lv1.setOnItemLongClickListener(lv1LongClickListener);

lv2.setOnItemLongClickListener(lv2LongClickListener);

lv1.setOnDragListener(myDragEventListener);

targetLayout.setOnDragListener(myDragEventListener);

fromLayout.setOnDragListener(myDragEventListener);

lv2.setOnDragListener(myDragEventListener);

}

@Override

public void onClick(View v) {

switch (v.getId()) {

//左移

case R.id.button1:

if (lv2.getChildCount()>=po_r+1) {

String cu=(String)lv2.getItemAtPosition(po_r);

Log.d("tag", "count="+lv2.getChildCount()+"po_l"+po_r);

arr_data2.remove(po_r);

arr_data1.add(cu);

arr_Adapter.notifyDataSetChanged();

}

else {

Toast.makeText(MainActivity.this,"當前位置已無內容",Toast.LENGTH_SHORT).show();

}

arr_Adapter2.notifyDataSetChanged();

break;

//右移

case R.id.button2:

if (lv1.getChildCount()>=po_l+1) {

String cu=(String)lv1.getItemAtPosition(po_l);

Log.d("tag", "count="+lv1.getChildCount()+"po_l"+po_l);

arr_data1.remove(po_l);

arr_data2.add(cu);

arr_Adapter2.notifyDataSetChanged();

}

else {

Toast.makeText(MainActivity.this,"當前位置已無內容",Toast.LENGTH_SHORT).show();

}

arr_Adapter.notifyDataSetChanged();

break;

//全部左移

case R.id.button3:

arr_data1.addAll(arr_data2);

arr_data2.clear();

arr_Adapter.notifyDataSetChanged();

arr_Adapter2.notifyDataSetChanged();

break;

//全部右移

case R.id.button4:

arr_data2.addAll(arr_data1);

arr_data1.clear();

arr_Adapter.notifyDataSetChanged();

arr_Adapter2.notifyDataSetChanged();

break;

//上移

case R.id.button5:

if(flag&&po_l>0){

String ch=arr_data1.get(po_l);

arr_data1.remove(po_l);

arr_data1.add(po_l-1,ch);

arr_Adapter.notifyDataSetChanged();

po_l--;

}

else if(!flag&&po_r>0){

String ch=arr_data2.get(po_r);

arr_data2.remove(po_r);

arr_data2.add(po_r-1,ch);

arr_Adapter2.notifyDataSetChanged();

po_r--;

}

break;

//下移

case R.id.button6:

if(flag&&po_l

String ch=arr_data1.get(po_l);

arr_data1.remove(po_l);

arr_data1.add(po_l+1,ch);

arr_Adapter.notifyDataSetChanged();

po_l++;

}

else if(!flag&&po_r

String ch=arr_data2.get(po_r);

arr_data2.remove(po_r);

arr_data2.add(po_r+1,ch);

arr_Adapter2.notifyDataSetChanged();

po_r++;

}

break;

default:

break;

}

}

/**

* DragStart_to_End

*/

//listView1長按事件

AdapterView.OnItemLongClickListener lv1LongClickListener=new AdapterView.OnItemLongClickListener() {

@Override

public boolean onItemLongClick(AdapterView> parent, View view, int position, long id) {

longClick_Flag=1;

//po_l=position;

// 將被拖動item傳遞到clipData

ClipData.Item item=new ClipData.Item(arr_data1.get(position));

String[] clipDescription={ClipDescription.MIMETYPE_TEXT_PLAIN};

ClipData dragData=new ClipData((CharSequence) view.getTag(),clipDescription,item);

//制造拖動影像

View.DragShadowBuilder myShadow=new MyDragShadowBuilder(view);

view.startDrag(dragData,myShadow,arr_data1.get(position),0);

return true;

}

};

//listView2長按事件

AdapterView.OnItemLongClickListener lv2LongClickListener=new AdapterView.OnItemLongClickListener() {

@Override

public boolean onItemLongClick(AdapterView> parent, View view, int position, long id) {

longClick_Flag=2;

//po_r=position;

// 將被拖動item傳遞到clipData

ClipData.Item item=new ClipData.Item(arr_data2.get(position));

String[] clipDescription={ClipDescription.MIMETYPE_TEXT_PLAIN};

ClipData dragData=new ClipData((CharSequence) view.getTag(),clipDescription,item);

//制造拖動影像

View.DragShadowBuilder myShadow=new MyDragShadowBuilder(view);

view.startDrag(dragData,myShadow,arr_data2.get(position),0);

return true;

}

};

//監聽拖拽事件和狀態

protected class MyDragEventListener implements View.OnDragListener{

@Override

public boolean onDrag(View v, DragEvent event) {//v代表目標視圖

//定義拖拽狀態

final int action=event.getAction();

switch (action){

//鼠標長按下開始拖動

case DragEvent.ACTION_DRAG_STARTED:

// All involved view accept ACTION_DRAG_STARTED for

// MIMETYPE_TEXT_PLAIN

if (event.getClipDescription().hasMimeType(

ClipDescription.MIMETYPE_TEXT_PLAIN)) {

return true; // Accept

} else {

return false; // reject

}

case DragEvent.ACTION_DRAG_ENTERED:

return true;

case DragEvent.ACTION_DRAG_LOCATION:

return true;

case DragEvent.ACTION_DRAG_EXITED:

return true;

case DragEvent.ACTION_DROP:

// Gets the item containing the dragged data

//獲取被拖動的item

ClipData.Item item = event.getClipData().getItemAt(0);

// If apply only if drop on buttonTarget

//由左向右拖動

if (v == targetLayout||v==lv2) {

String droppedItem = item.getText().toString();

arr_data2.add(droppedItem);

arr_Adapter2.notifyDataSetChanged();

arr_data1.remove(droppedItem);

arr_Adapter.notifyDataSetChanged();

return true;

}

//由右向左拖動

if (v == fromLayout||v==lv1) {

String droppedItem = item.getText().toString();

arr_data1.add(droppedItem);

arr_Adapter.notifyDataSetChanged();

arr_data2.remove(droppedItem);

arr_Adapter2.notifyDataSetChanged();

return true;

}

return true;

case DragEvent.ACTION_DRAG_ENDED:

return true;

default: // unknown case

return false;

}

}

}

//構造拖動影像

private static class MyDragShadowBuilder extends View.DragShadowBuilder{

private static Drawable shadow;

//生成影像

public MyDragShadowBuilder(View view) {

super(view);

shadow=new ColorDrawable(Color.LTGRAY);

}

//設置影像參數

@Override

public void onProvideShadowMetrics(Point shadowSize, Point shadowTouchPoint) {

super.onProvideShadowMetrics(shadowSize, shadowTouchPoint);

int width=getView().getWidth();

int height=getView().getHeight();

shadow.setBounds(0,0,width,height);

shadowSize.set(width,height);

shadowTouchPoint.set(width/2,height/2);

}

//畫影像

@Override

public void onDrawShadow(Canvas canvas) {

//super.onDrawShadow(canvas);

shadow.draw(canvas);

}

}

}

總結

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