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POAndroid beginner - Place Image at DragEvent
 

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    <p>I realize that similar questions have been posted, and I've viewed them and lots of other topics etc to find a solution - I'm clearly missing the obvious - as I am still learning the basics!</p> <p>Goal: Simple drag and drop. User moves image across screen and either drops on top of another image or anywhere on the screen.</p> <p>API: >11</p> <p>Completed:</p> <ul> <li>Can drag the image and place on top of another image and get response (using Toast to confirm).</li> <li>Can drag the image anywhere on screen and get response (using Toast to confirm).</li> </ul> <p>NOT working:</p> <ul> <li>Cannot drag image anywhere on screen and deposit image where finger lifted</li> </ul> <p>I have tried lots of different methods but always compiling errors. Looking at my code, could anyone recommend a clean and simple method to place a image at ACTION_DRAG_ENDED (keep in mind I am a beginner) </p> <p>Here is my java code:</p> <pre><code>public class MainActivity extends Activity { @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the action bar if it is present. getMenuInflater().inflate(R.menu.activity_main, menu); return true; } boolean okToDrop; /** Called when the activity is first created. */ @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); findViewById(R.id.oval).setOnTouchListener(new theTouchListener()); findViewById(R.id.square).setOnTouchListener(new theTouchListener()); findViewById(R.id.robot).setOnTouchListener(new theTouchListener()); findViewById(R.id.oval).setOnDragListener(new theDragListener()); findViewById(R.id.square).setOnDragListener(new theDragListener()); findViewById(R.id.robot).setOnDragListener(new theDragListener()); } private final class theTouchListener implements OnTouchListener { public boolean onTouch(View view, MotionEvent motionEvent) { if (motionEvent.getAction() == MotionEvent.ACTION_DOWN) { ClipData data = ClipData.newPlainText("", ""); DragShadowBuilder shadowBuilder = new View.DragShadowBuilder( view); view.startDrag(data, shadowBuilder, view, 0); view.setVisibility(View.VISIBLE); return true; } else { return false; } } } class theDragListener implements OnDragListener { @Override public boolean onDrag(View view, DragEvent dragEvent) { int dragAction = dragEvent.getAction(); View dragView = (View) dragEvent.getLocalState(); if (dragAction == DragEvent.ACTION_DRAG_EXITED) { okToDrop = false; } else if (dragAction == DragEvent.ACTION_DRAG_ENTERED) { okToDrop = true; } else if (dragAction == DragEvent.ACTION_DRAG_ENDED) { if (dropEventNotHandled(dragEvent) == true) { // Code to generate image goes here *********************** Context context = getApplicationContext(); CharSequence text = "Action Dropped Not In Box!"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); dragView.setVisibility(View.VISIBLE); } } else if (dragAction == DragEvent.ACTION_DROP &amp;&amp; okToDrop) { ImageView i = (ImageView) findViewById(R.id.square); i.setImageResource(R.drawable.oval); dragView.setVisibility(View.INVISIBLE); Context context = getApplicationContext(); CharSequence text = "Action Resulted In It Being Dropped In The Box"; int duration = Toast.LENGTH_SHORT; Toast toast = Toast.makeText(context, text, duration); toast.show(); } return true; } private boolean dropEventNotHandled(DragEvent dragEvent) { return !dragEvent.getResult(); } } </code></pre> <p>And my xml:</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" tools:context=".MainActivity" &gt; &lt;ImageView android:id="@+id/square" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentRight="true" android:layout_centerVertical="true" android:src="@drawable/square_box" /&gt; &lt;ImageView android:id="@+id/oval" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:layout_marginLeft="58dp" android:layout_marginTop="58dp" android:src="@drawable/oval" /&gt; &lt;ImageView android:id="@+id/robot" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignLeft="@+id/oval" android:layout_below="@+id/square" android:layout_marginTop="70dp" android:src="@drawable/ic_launcher" /&gt; &lt;/RelativeLayout&gt; </code></pre>
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    1. COWhat are the compile errors that you get?
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    2. COHi @codeMagic The closest bit of code I got working was using a Linear layout setup (seems a bit heavy though just to place an image) I got an error 'The constructor ImageView(MainActivity.theDragListener) is undefined' Would this need to be declared outside the 'theDragListener'? - not sure why this is undefined..
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    3. COIt looks ok to me so I must not be seeing something also. Which line are you getting the error for?
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      1. UScodeMagic
 

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