How to select a particular tile when clicked and inflate a bitmap on it in tileview android

How to Select a Tile When Clicked and Inflate a Bitmap on It in TileView Android

This article explains how to implement click functionality on a TileView in Android, allowing users to select individual tiles and display a bitmap image on the selected tile.

Setting Up the TileView

Begin by creating a TileView object in your layout XML file.

“`xml

“`

In your Activity or Fragment, initialize the TileView, set the tile size, and define the tile grid dimensions.

“`java
TileView tileView = findViewById(R.id.tileView);
tileView.setTileSize(100); // Set tile size in pixels
tileView.setNumColumns(10); // Set the number of columns in the grid
tileView.setNumRows(10); // Set the number of rows in the grid
“`

Implementing Tile Click Handling

The TileView doesn’t inherently provide click listeners for individual tiles. To handle tile clicks, you’ll need to add an event listener for touch events. Implement the following steps:

1. **Create an OnTouchListener:** Implement the OnTouchListener interface for the TileView.
2. **Determine Clicked Tile:** In the onTouch method, retrieve the coordinates of the touch event and calculate the tile index based on the tile size and grid dimensions.
3. **Inflate the Bitmap:** Load the bitmap image you want to display on the selected tile and create a Drawable from it.
4. **Draw the Bitmap:** Use the drawTile method of the TileView to draw the bitmap at the calculated tile index. You may need to adjust the tile’s drawing parameters for proper positioning.

tileView.setOnTouchListener(new View.OnTouchListener() {
    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            int x = (int) event.getX();
            int y = (int) event.getY();
            int tileIndex = y / tileView.getTileSize() * tileView.getNumColumns() + x / tileView.getTileSize();
            
            // Load your bitmap
            Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.your_bitmap);
            Drawable tileDrawable = new BitmapDrawable(getResources(), bitmap);
            
            // Draw the bitmap on the tile
            tileView.drawTile(tileDrawable, tileIndex);
            return true;
        }
        return false;
    }
});

Managing Multiple Tile Selections

If you need to select multiple tiles, you’ll need a mechanism to track which tiles are currently selected. You can use a data structure, such as a list, to store the indices of selected tiles. When handling a click, check if the tile is already selected and toggle its selection state accordingly.

“`java
List selectedTileIndices = new ArrayList<>();

// … Inside the onTouch method …

if (selectedTileIndices.contains(tileIndex)) {
selectedTileIndices.remove((Integer) tileIndex);
// Clear the bitmap from the tile
} else {
selectedTileIndices.add(tileIndex);
// Draw the bitmap on the tile
}
“`

Example: Displaying a Bitmap on a TileView

Here’s a complete example that demonstrates selecting tiles and inflating a bitmap:

“`java
public class TileViewActivity extends AppCompatActivity {
TileView tileView;
int tileSize = 100;
List selectedTileIndices = new ArrayList<>();

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tile_view);

tileView = findViewById(R.id.tileView);
tileView.setTileSize(tileSize);
tileView.setNumColumns(10);
tileView.setNumRows(10);

tileView.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_DOWN) {
int x = (int) event.getX();
int y = (int) event.getY();
int tileIndex = y / tileSize * tileView.getNumColumns() + x / tileSize;

if (selectedTileIndices.contains(tileIndex)) {
selectedTileIndices.remove((Integer) tileIndex);
tileView.drawTile(null, tileIndex); // Clear the bitmap
} else {
selectedTileIndices.add(tileIndex);
Bitmap bitmap = BitmapFactory.decodeResource(getResources(), R.drawable.your_bitmap);
Drawable tileDrawable = new BitmapDrawable(getResources(), bitmap);
tileView.drawTile(tileDrawable, tileIndex); // Draw the bitmap
}
return true;
}
return false;
}
});
}
}
“`

Remember to create a drawable resource named “your_bitmap” in your project and replace it with the bitmap you want to display on the selected tiles.