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PODrag and Drop persistent location
 

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    <p>I am woking on a project that uses drag and drop views within a relative layout. I have a button that generates a new image view when clicked. This image view is created in the top left corner of the screen, (0,0) relative to the parent view. I can then drag and drop the image view anywhere I want. Here's the problem: When I click the button again to make another image view, all of the image views move to the top left corner. Is Is there a different add method I should use or some way to keep the other image views in place? All the code is posted below.</p> <p>Code:</p> <p><strong>MyFragment.java</strong></p> <pre><code>package com.example.layouttest; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentManager; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; public class MyFragment extends Fragment { public static final String EXTRA_MESSAGE = "EXTRA_MESSAGE"; public String text; static FragmentManager fragMan; public static final MyFragment newInstance(String message) { MyFragment f = new MyFragment(); f.setRetainInstance(true); Bundle bdl = new Bundle(1); bdl.putString(EXTRA_MESSAGE, message); f.setArguments(bdl); return f; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { String message = getArguments().getString(EXTRA_MESSAGE); View v = inflater.inflate(R.layout.myfragment_layout, container, false); TextView messageTextView = (TextView)v.findViewById(R.id.textView); messageTextView.setText(message); text = message; return v; } } </code></pre> <p><strong>PageViewActivity.java</strong></p> <pre><code>package com.example.layouttest; import java.util.ArrayList; import java.util.List; import com.example.layouttest.R; import android.content.ClipData; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentManager; import android.support.v4.app.FragmentPagerAdapter; import android.support.v4.app.FragmentTransaction; import android.support.v4.view.ViewPager; import android.util.Log; import android.view.MotionEvent; import android.view.View; import android.view.View.DragShadowBuilder; import android.view.View.OnTouchListener; import android.view.ViewGroup.LayoutParams; import android.widget.ImageView; import android.widget.RelativeLayout; public class PageViewActivity extends FragmentActivity { MyPageAdapter pageAdapter; FragmentManager fragMan; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_page_view); fragMan = getSupportFragmentManager(); List&lt;Fragment&gt; fragments = getFragments(); FragmentTransaction fragTrans = fragMan.beginTransaction(); fragTrans.commit(); pageAdapter = new MyPageAdapter(getSupportFragmentManager(), fragments); ViewPager pager = (ViewPager)findViewById(R.id.viewpager); pager.setAdapter(pageAdapter); pager.setPageTransformer(true, new ZoomOutPageTransformer()); pager.setCurrentItem(pageAdapter.cur); } public void click(View v){ RelativeLayout layout = (RelativeLayout)v.getParent(); ImageView image = new ImageView(this); image.setLayoutParams(new LayoutParams(80,80)); image.setImageDrawable(getResources().getDrawable(R.drawable.shape)); image.setOnTouchListener(new MyTouchListener()); layout.setOnDragListener(new MyDragListener(layout)); layout.addView(image); } private List&lt;Fragment&gt; getFragments(){ List&lt;Fragment&gt; fList = new ArrayList&lt;Fragment&gt;(); for(int i = 1; i &lt;= 5;i++){ MyFragment f = MyFragment.newInstance("Fragment " + i); fList.add(f); } return fList; } private class MyPageAdapter extends FragmentPagerAdapter { public List&lt;Fragment&gt; fragments; public int cur; public MyPageAdapter(FragmentManager fm, List&lt;Fragment&gt; fragments) { super(fm); this.fragments = fragments; cur = fragments.size()/2; } @Override public Fragment getItem(int position) { return this.fragments.get(position); } @Override public int getCount() { return this.fragments.size(); } } private class MyTouchListener implements OnTouchListener{ @Override public boolean onTouch(View arg0, MotionEvent arg1) { if(arg1.getAction() == MotionEvent.ACTION_DOWN){ ClipData data = ClipData.newPlainText("", ""); DragShadowBuilder shadowBuilder = new View.DragShadowBuilder(arg0); arg0.startDrag(data, shadowBuilder, arg0, 0); arg0.setVisibility(View.INVISIBLE); } return true; } } } </code></pre> <p><strong>MyDragListener.java</strong></p> <pre><code>package com.example.layouttest; import android.util.Log; import android.view.DragEvent; import android.view.View; import android.view.View.OnDragListener; import android.widget.RelativeLayout; public class MyDragListener implements OnDragListener{ int x; int y; RelativeLayout layout; public MyDragListener(RelativeLayout l){ layout = l; } @Override public boolean onDrag(View v, DragEvent event) { int action = event.getAction(); View view = (View) event.getLocalState(); RelativeLayout l = (RelativeLayout)view.getParent(); if(!l.equals(layout)) return false; if(action == DragEvent.ACTION_DRAG_LOCATION){ x = (int)event.getX(); y = (int)event.getY(); Log.d("DRAG", x + "," + y); } if(action == DragEvent.ACTION_DRAG_ENDED){ Log.d("DRAG", "Dropped at " + x + "," + y); view.layout(x-(view.getWidth()/2), y-(view.getHeight()/2), x+(view.getWidth()/2), y+(view.getHeight()/2)); view.setVisibility(View.VISIBLE); } return true; } } </code></pre> <p><strong>ZoomOutPageTransformer.java</strong></p> <pre><code>package com.example.layouttest; import android.support.v4.view.ViewPager.PageTransformer; import android.view.View; public class ZoomOutPageTransformer implements PageTransformer { private static float MIN_SCALE = 0.85f; private static float MIN_ALPHA = 0.5f; public void transformPage(View view, float position) { int pageWidth = view.getWidth(); int pageHeight = view.getHeight(); if (position &lt; -1) { // [-Infinity,-1) // This page is way off-screen to the left. view.setAlpha(0); } else if (position &lt;= 1) { // [-1,1] // Modify the default slide transition to shrink the page as well float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position)); float vertMargin = pageHeight * (1 - scaleFactor) / 2; float horzMargin = pageWidth * (1 - scaleFactor) / 2; if (position &lt; 0) { view.setTranslationX(horzMargin - vertMargin / 2); } else { view.setTranslationX(-horzMargin + vertMargin / 2); } // Scale the page down (between MIN_SCALE and 1) view.setScaleX(scaleFactor); view.setScaleY(scaleFactor); // Fade the page relative to its size. view.setAlpha(MIN_ALPHA + (scaleFactor - MIN_SCALE) / (1 - MIN_SCALE) * (1 - MIN_ALPHA)); } else { // (1,+Infinity] // This page is way off-screen to the right. view.setAlpha(0); } } } </code></pre> <p><strong>myfragment_layout.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:id="@+id/layout" android:background="#00308F" &gt; &lt;TextView android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_centerHorizontal="true" android:layout_centerVertical="true" android:textAppearance="?android:attr/textAppearanceLarge" /&gt; &lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/textView" android:layout_centerHorizontal="true" android:layout_marginTop="20dp" android:onClick="click" android:text="@string/hello_world" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p><strong>shape.xml</strong></p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle"&gt; &lt;stroke android:width="2dp" android:color="#FFFFFF" /&gt; &lt;gradient android:angle="225" android:endColor="#FFFFFF" android:startColor="#000000" /&gt; &lt;corners android:bottomLeftRadius="7dp" android:bottomRightRadius="7dp" android:topLeftRadius="7dp" android:topRightRadius="7dp" /&gt; &lt;/shape&gt; </code></pre> <p><strong>activity_page_view.xml</strong></p> <pre><code>&lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" &gt; &lt;android.support.v4.view.ViewPager android:id="@+id/viewpager" android:layout_width="fill_parent" android:layout_height="fill_parent" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>I would be greatly appreciative if anyone can find the flaw in my code or let me know how to keep my images in place when adding a new one.</p> <p>Here is a link for the .apk if anyone would like to see the problem firsthand: <a href="https://docs.google.com/file/d/0By8LNIK1Saw1anMtNWtMRmtyMUE/edit?usp=sharing" rel="nofollow">LayoutTest.apk</a> </p>
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