java - Set drawable size programmatically

Java - Set drawable size programmatically

In Android, you can set the size of a drawable programmatically by creating a new Bitmap with the desired dimensions and then creating a BitmapDrawable from it. Here's an example:

import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.Drawable; import android.os.Bundle; import android.widget.ImageView; import androidx.appcompat.app.AppCompatActivity; public class YourActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); // Get the original drawable Drawable originalDrawable = getResources().getDrawable(R.drawable.your_drawable); // Set the desired width and height int desiredWidth = 200; // in pixels int desiredHeight = 200; // in pixels // Create a Bitmap from the original drawable Bitmap originalBitmap = ((BitmapDrawable) originalDrawable).getBitmap(); // Create a new Bitmap with the desired size Bitmap resizedBitmap = Bitmap.createScaledBitmap(originalBitmap, desiredWidth, desiredHeight, false); // Create a BitmapDrawable from the resized Bitmap Drawable resizedDrawable = new BitmapDrawable(getResources(), resizedBitmap); // Set the resized drawable to an ImageView ImageView imageView = findViewById(R.id.imageView); imageView.setImageDrawable(resizedDrawable); } }

In this example:

  1. getResources().getDrawable(R.drawable.your_drawable) gets the original drawable from the resources.
  2. Bitmap originalBitmap = ((BitmapDrawable) originalDrawable).getBitmap() extracts the Bitmap from the original drawable.
  3. Bitmap resizedBitmap = Bitmap.createScaledBitmap(originalBitmap, desiredWidth, desiredHeight, false) creates a new Bitmap with the desired dimensions.
  4. new BitmapDrawable(getResources(), resizedBitmap) creates a BitmapDrawable from the resized Bitmap.
  5. imageView.setImageDrawable(resizedDrawable) sets the resized drawable to an ImageView.

Make sure to replace R.drawable.your_drawable with the actual resource ID of your drawable, and adjust the desired width and height accordingly.

Examples

  1. Set fixed size for a Drawable in Java

    • Java set fixed size for Drawable
    • Description: Demonstrates how to set a fixed size for a Drawable in Java programmatically.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int width = 100; // Set your desired width int height = 100; // Set your desired height drawable.setBounds(0, 0, width, height);

    Uses setBounds to set a fixed width and height for the Drawable.

  2. Maintain aspect ratio while setting Drawable size in Java

    • Java set Drawable size maintain aspect ratio
    • Description: Illustrates how to set the size of a Drawable while maintaining its aspect ratio.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int desiredWidth = 150; // Set your desired width int calculatedHeight = (int) ((float) desiredWidth / drawable.getIntrinsicWidth() * drawable.getIntrinsicHeight()); drawable.setBounds(0, 0, desiredWidth, calculatedHeight);

    Calculates the height proportionally based on the desired width while maintaining the aspect ratio.

  3. Scale Drawable programmatically in Java

    • Java scale Drawable programmatically
    • Description: Shows how to scale a Drawable programmatically in Java.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int scaleFactor = 2; // Set your desired scale factor int scaledWidth = drawable.getIntrinsicWidth() * scaleFactor; int scaledHeight = drawable.getIntrinsicHeight() * scaleFactor; drawable.setBounds(0, 0, scaledWidth, scaledHeight);

    Scales the Drawable based on the specified scale factor.

  4. Set Drawable size based on the device's screen density in Java

    • Java set Drawable size based on screen density
    • Description: Guides on setting the size of a Drawable based on the device's screen density.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); float density = getResources().getDisplayMetrics().density; int desiredDpSize = 50; // Set your desired size in dp int desiredPxSize = (int) (desiredDpSize * density); drawable.setBounds(0, 0, desiredPxSize, desiredPxSize);

    Converts the desired size from dp to pixels based on the screen density.

  5. Set Drawable size relative to the parent view in Java

    • Java set Drawable size relative to parent view
    • Description: Demonstrates how to set the size of a Drawable relative to its parent view in Java.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int parentViewSize = 200; // Set the size of the parent view drawable.setBounds(0, 0, parentViewSize / 2, parentViewSize / 2);

    Sets the Drawable size to be half the size of the parent view.

  6. Adjust Drawable size dynamically based on text size in Java

    • Java adjust Drawable size based on text size
    • Description: Illustrates how to dynamically adjust the size of a Drawable based on the size of associated text.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); TextView textView = findViewById(R.id.your_text_view); // Reference to your TextView int textSize = (int) textView.getTextSize(); drawable.setBounds(0, 0, textSize, textSize);

    Sets the Drawable size based on the text size of an associated TextView.

  7. Set maximum size for Drawable in Java

    • Java set maximum size for Drawable
    • Description: Shows how to set a maximum size for a Drawable in Java.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int maxWidth = 150; // Set your desired maximum width int maxHeight = 150; // Set your desired maximum height int width = Math.min(drawable.getIntrinsicWidth(), maxWidth); int height = Math.min(drawable.getIntrinsicHeight(), maxHeight); drawable.setBounds(0, 0, width, height);

    Ensures the Drawable size does not exceed the specified maximum width and height.

  8. Set Drawable size based on a percentage of the screen width in Java

    • Java set Drawable size as a percentage of screen width
    • Description: Guides on setting the size of a Drawable as a percentage of the device's screen width.
    Drawable drawable = getResources().getDrawable(R.drawable.your_drawable); int screenWidth = getResources().getDisplayMetrics().widthPixels; int percentageWidth = 25; // Set your desired percentage of the screen width int desiredWidth = (int) (screenWidth * (percentageWidth / 100f)); drawable.setBounds(0, 0, desiredWidth, desiredWidth);

    Calculates the desired width as a percentage of the screen width.

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