java


How do I implement drag and drop in my game?


I have been looking all over SOF and online tutorials, but for some reason I still can't get it to work. I want to implement a drag and drop functionality in my game. Here is the activity:
I want to be able to drag and drop the 4 shapes in the bottom. If the correct shape fits, I want the shape with the "?" to change into the correct shape. Can someone show me how I can do this?
Here is my code:
public class SecondActivity extends AppCompatActivity {
int n;
ImageView shape1, shape2, shape3, shape4, guessShape;
ImageButton exit;
private android.widget.RelativeLayout.LayoutParams layoutParams;
Random rand = new Random();
ImageView[] shapes = new ImageView[4];
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
//declare each imageview
shape1 = (ImageView) findViewById(R.id.shape1);
shape2 = (ImageView) findViewById(R.id.shape2);
shape3 = (ImageView) findViewById(R.id.shape3);
shape4 = (ImageView) findViewById(R.id.shape4);
guessShape = (ImageView) findViewById(R.id.guessShape);
exit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// TODO Auto-generated method stub
finish();
System.exit(0);
}
});
//add each imageView to the shapes[] array
shapes[0] = shape1;
shapes[1] = shape2;
shapes[2] = shape3;
shapes[3] = shape4;
//store all the shapes in an array
int[] images = new int[]{R.drawable.img_0, R.drawable.img_1, R.drawable.img_2, R.drawable.img_3, R.drawable.img_4,
R.drawable.img_5, R.drawable.img_6, R.drawable.img_7, R.drawable.img_8, R.drawable.img_9, R.drawable.img_10,
R.drawable.img_11, R.drawable.img_12, R.drawable.img_13, R.drawable.img_14, R.drawable.img_15, R.drawable.img_16,
R.drawable.img_17};
//store all the guessShapes in an array
int[] outlines = new int[]{R.drawable.outline_0, R.drawable.outline_1, R.drawable.outline_2,
R.drawable.outline_3, R.drawable.outline_4, R.drawable.outline_5, R.drawable.outline_6,
R.drawable.outline_7, R.drawable.outline_8, R.drawable.outline_9, R.drawable.outline_10,
R.drawable.outline_11, R.drawable.outline_12, R.drawable.outline_13, R.drawable.outline_14,
R.drawable.outline_15, R.drawable.outline_16, R.drawable.outline_17};
//generate 4 random images from the array's and ensure that they don't match each other
ArrayList<Integer> list = new ArrayList<Integer>();
for (int i = 0; i < 18; i++) {
list.add(new Integer(i));
}
Collections.shuffle(list);
int whichImg = (int) Math.round((Math.random() * 4));
int img1 = list.get(0);
int img2 = list.get(1);
int img3 = list.get(2);
int img4 = list.get(3);
if (whichImg == 1) {
whichImg = img1;
} else if (whichImg == 2) {
whichImg = img2;
} else if (whichImg == 3) {
whichImg = img3;
} else {
whichImg = img4;
}
int outlineID = outlines[whichImg];
//set the shape in each imageview
guessShape.setBackgroundResource(outlineID);
shape1.setBackgroundResource(images[img1]);
shape2.setBackgroundResource(images[img2]);
shape3.setBackgroundResource(images[img3]);
shape4.setBackgroundResource(images[img4]);
//ensures that 1/4 shape has the guess shape correspondence
final Object currentBackground = guessShape.getBackground().getConstantState();
//for loop to have the guess shape and 1/4 shapes to match
for (int i = 0; i < 18; i++) {
if (currentBackground.equals(getResourceID("outline_" + i, "drawable", getApplicationContext()))) {
int random = new Random().nextInt(shapes.length);
shapes[random].setBackgroundResource(getResourceID("img_" + i, "drawable", getApplicationContext()));
}
//set tags for each view
guessShape.setTag("gShape");
shape1.setTag("S_1");
shape2.setTag("S_2");
shape3.setTag("S_3");
shape4.setTag("S_4");
}
}
//method to get the ID of an image in drawable folder
protected final static int getResourceID(final String resName, final String resType, final Context ctx)
{
final int ResourceID =
ctx.getResources().getIdentifier(resName, resType,
ctx.getApplicationInfo().packageName);
if (ResourceID == 0)
{
throw new IllegalArgumentException
(
"No resource string found with name " + resName
);
}
else
{
return ResourceID;
}
}
}
Although you were not clear enough.
Try this, First make a class that implements onTouchListener
private final class MyTouchListener 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.INVISIBLE);
return true;
} else {
return false;
}
}
}
Then define a drag listener
class MyDragListener implements OnDragListener {
Drawable enterShape = getResources().getDrawable(
R.drawable.shape_droptarget);
Drawable normalShape = getResources().getDrawable(R.drawable.shape);
#Override
public boolean onDrag(View v, DragEvent event) {
int action = event.getAction();
switch (event.getAction()) {
case DragEvent.ACTION_DRAG_STARTED:
// do nothing
break;
case DragEvent.ACTION_DRAG_ENTERED:
v.setBackgroundDrawable(enterShape);
break;
case DragEvent.ACTION_DRAG_EXITED:
v.setBackgroundDrawable(normalShape);
break;
case DragEvent.ACTION_DROP:
// Dropped, reassign View to ViewGroup
View view = (View) event.getLocalState();
ViewGroup owner = (ViewGroup) view.getParent();
owner.removeView(view);
LinearLayout container = (LinearLayout) v;
container.addView(view);
view.setVisibility(View.VISIBLE);
break;
case DragEvent.ACTION_DRAG_ENDED:
v.setBackgroundDrawable(normalShape);
default:
break;
}
return true;
}
}
Now simply use these lines
findViewById(R.id.myimage1).setOnTouchListener(new MyTouchListener());
and
findViewById(R.id.bottomleft).setOnDragListener(new MyDragListener());
Here are some tutorials that might help you
Tutorialpoint
Link 2

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