Android SDK - camera2 - Draw rectangle over TextureView

Android SDK - camera2 - Draw rectangle over TextureView

To draw a rectangle over a TextureView in Android Camera2 API, you can use a combination of a custom View and Canvas drawing. Here's a basic example to get you started:

First, create a custom View class that extends TextureView and overrides the onDraw method to draw the rectangle:

import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.util.AttributeSet; import android.view.TextureView; public class RectangleOverlayView extends TextureView { private Paint paint; public RectangleOverlayView(Context context) { super(context); init(); } public RectangleOverlayView(Context context, AttributeSet attrs) { super(context, attrs); init(); } public RectangleOverlayView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); init(); } private void init() { paint = new Paint(); paint.setColor(Color.RED); paint.setStyle(Paint.Style.STROKE); paint.setStrokeWidth(5); // Adjust thickness as needed } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // Draw rectangle on the TextureView canvas.drawRect(100, 100, getWidth() - 100, getHeight() - 100, paint); } }

Then, add this custom view to your layout XML file:

<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent"> <your.package.name.RectangleOverlayView android:id="@+id/texture_view" android:layout_width="match_parent" android:layout_height="match_parent" /> </RelativeLayout>

Finally, use this custom TextureView in your activity:

import android.os.Bundle; import android.support.v7.app.AppCompatActivity; public class CameraActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_camera); RectangleOverlayView textureView = findViewById(R.id.texture_view); // Initialize and configure Camera2 API to display camera preview on textureView } }

This example draws a red rectangle over the TextureView. You can customize the paint object to change the color, stroke width, etc., and adjust the rectangle coordinates as needed to fit your requirements. Additionally, make sure to properly initialize and configure the Camera2 API to display the camera preview on the TextureView.

Examples

  1. "Android SDK camera2 draw rectangle tutorial"

    • Description: This query suggests a desire to learn how to draw rectangles over a TextureView using the Camera2 API in Android. It indicates a need for a comprehensive tutorial covering this specific topic.
    // Code Implementation // Step 1: Create a custom class extending TextureView public class RectangleTextureView extends TextureView { private Paint paint; private Rect rect; // Constructor public RectangleTextureView(Context context, AttributeSet attrs) { super(context, attrs); paint = new Paint(); paint.setColor(Color.RED); // Set rectangle color paint.setStyle(Paint.Style.STROKE); // Set rectangle style paint.setStrokeWidth(5); // Set rectangle border width rect = new Rect(); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); // Step 2: Draw rectangle on the TextureView canvas.drawRect(rect, paint); } // Step 3: Method to update rectangle position and size public void updateRect(int left, int top, int right, int bottom) { rect.set(left, top, right, bottom); invalidate(); // Refresh view to draw updated rectangle } }

  2. "Android Camera2 TextureView overlay rectangle example"

    • Description: This query indicates a specific interest in examples demonstrating how to overlay a rectangle onto a TextureView in Android using the Camera2 API.
    // Code Implementation Continued // Step 4: Implement CameraDevice.StateCallback private final CameraDevice.StateCallback stateCallback = new CameraDevice.StateCallback() { @Override public void onOpened(@NonNull CameraDevice camera) { // Step 5: Start camera preview Camera2Utils.this.cameraDevice = camera; try { Camera2Utils.this.createCameraPreviewSession(); } catch (CameraAccessException e) { e.printStackTrace(); } } // Other methods overridden };

  3. "Android Camera2 TextureView draw rectangle guide"

    • Description: This query seeks a guide specifically tailored to drawing rectangles over a TextureView using the Camera2 API in Android.
    // Code Implementation Continued // Step 6: Create camera preview session private void createCameraPreviewSession() throws CameraAccessException { SurfaceTexture texture = textureView.getSurfaceTexture(); assert texture != null; texture.setDefaultBufferSize(previewSize.getWidth(), previewSize.getHeight()); Surface surface = new Surface(texture); // Step 7: Prepare CaptureRequestBuilder CaptureRequest.Builder captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW); captureRequestBuilder.addTarget(surface); // Step 8: Start capture session cameraDevice.createCaptureSession(Arrays.asList(surface), new CameraCaptureSession.StateCallback() { @Override public void onConfigured(@NonNull CameraCaptureSession session) { if (cameraDevice == null) { return; } // Step 9: Update preview with new CaptureRequest try { captureRequestBuilder.set(CaptureRequest.CONTROL_AF_MODE, CaptureRequest.CONTROL_AF_MODE_CONTINUOUS_PICTURE); CaptureRequest captureRequest = captureRequestBuilder.build(); session.setRepeatingRequest(captureRequest, null, null); } catch (CameraAccessException e) { e.printStackTrace(); } } // Other methods overridden }, null); }

  4. "Android SDK camera2 draw shapes on TextureView"

    • Description: This query broadens the scope to drawing various shapes, not just rectangles, on a TextureView using the Camera2 API.
    // Code Implementation Continued // Step 10: Call updateRect() to draw rectangle rectangleTextureView.updateRect(left, top, right, bottom);

  5. "Android Camera2 API overlay rectangle on live camera feed"

    • Description: This query suggests a desire to overlay a rectangle onto a live camera feed using the Camera2 API in Android, which implies real-time processing and rendering.
    // Code Implementation Continued // Step 11: Implement touch listener to update rectangle position rectangleTextureView.setOnTouchListener(new OnTouchListener() { @Override public boolean onTouch(View v, MotionEvent event) { switch (event.getAction()) { case MotionEvent.ACTION_DOWN: startX = event.getX(); startY = event.getY(); break; case MotionEvent.ACTION_MOVE: endX = event.getX(); endY = event.getY(); rectangleTextureView.updateRect((int) startX, (int) startY, (int) endX, (int) endY); break; case MotionEvent.ACTION_UP: // Additional handling if needed break; } return true; } });

  6. "Android SDK Camera2 draw bounding box on TextureView"

    • Description: This query specifically targets drawing a bounding box, often used for object detection or tracking, on a TextureView using the Camera2 API.
    // Code Implementation Continued // Step 12: Optional - Adjust rectangle color and style paint.setColor(Color.GREEN); // Change rectangle color paint.setStrokeWidth(10); // Change rectangle border width

  7. "Android SDK Camera2 API draw rectangle on live camera view"

    • Description: This query combines several relevant terms to specify the desired outcome of drawing rectangles directly on a live camera view using the Camera2 API in Android.
    // Code Implementation Continued // Step 14: Release camera resources when not in use public void closeCamera() { if (cameraDevice != null) { cameraDevice.close(); cameraDevice = null; } }

  8. "Android Camera2 TextureView rectangle overlay implementation"

    • Description: This query likely comes from someone seeking a practical implementation example of overlaying rectangles on a TextureView using the Camera2 API in Android.
    // Code Implementation Continued // Step 15: Release camera resources onPause() or onStop() @Override public void onPause() { super.onPause(); closeCamera(); }

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