User can drap a item from listSource, the long clicked item is copy to item in dragData, then drop on listTarget to add it.
Modify main.xml to have two ListView.
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<LinearLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="horizontal" >
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<ScrollView
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView
android:id="@+id/comments"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />
</ScrollView>
</LinearLayout>
<LinearLayout
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Drag Source" />
<ListView
android:id="@+id/sourcelist"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
<LinearLayout
android:id="@+id/targetlayout"
android:layout_width="0dp"
android:layout_height="fill_parent"
android:layout_weight="1"
android:orientation="vertical" >
<TextView
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="Drop Target" />
<ListView
android:id="@+id/targetlist"
android:layout_width="fill_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</LinearLayout>
</LinearLayout>
Java Code:
package com.exercise.com;
import java.util.ArrayList;
import java.util.List;
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.view.DragEvent;
import android.view.View;
import android.view.View.DragShadowBuilder;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
public class AndroidDragAndDropActivity extends Activity {
LinearLayout targetLayout;
ListView listSource, listTarget;
TextView comments;
String commentMsg;
MyDragEventListener myDragEventListener = new MyDragEventListener();
String[] month ={
"January",
"February",
"March",
"April",
"May",
"June",
"July",
"August",
"September",
"October",
"November",
"December"};
List<String> droppedList;
ArrayAdapter<String> droppedAdapter;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
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);
}
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);
droppedList.add(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;
}
}
}
}
Download the files.
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