Android 사용자 정의 주마등 구현(SurfaceView)

이치에 따라 주마등 기능인 안드로이드는 이미 실현되었지만 사용자 정의 주마등 기능은SurfaceView를 통해 실현되었고 서브라인을 사용하여 보기를 갱신하여 성능이 더욱 좋고 주마등의 작동과 정지는 모두 스스로 제어하여 더욱 유연해졌다.

public class MarqueeTextSurfaceView extends SurfaceView implements SurfaceHolder.Callback {

	private SurfaceHolder mHolder;
	private MyThread myThread;
	private String mText = "";
	private boolean isSurfaceValid = false;
	private float textLength = 0f;//     
	private float viewWidth = 880.0f;//      
	private float step = 0f;//       
	private float y = 0f;//       
	private float temp_view_plus_text_length = 0.0f;//          
	private float temp_view_plus_two_text_length = 0.0f;//          
	private int speed = 10;
	private Paint paint = null;//     

	public MarqueeTextSurfaceView(Context context) {
		super(context);
	}

	public MarqueeTextSurfaceView(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	public MarqueeTextSurfaceView(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	@Override
	public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
		holder.setFixedSize(width, height);
	}

	public void setText(String str) {//         
		mText = str;
		textLength = paint.measureText(mText);
		temp_view_plus_two_text_length = viewWidth + textLength * 2f;
		// viewWidth = mHolder.getSurfaceFrame().width();
		step = textLength;
		temp_view_plus_text_length = viewWidth + textLength;
	}

	public void setSpeed(int speed) {//         
		this.speed = speed;
	}

	public void canScroll() {
		isSurfaceValid = true;
	}

	public void suspend() {//          
		step = temp_view_plus_text_length - 20;
	}

	public void init() {//    
		setZOrderOnTop(true);
		mHolder = getHolder();
		mHolder.addCallback(this);
		myThread = new MyThread(mHolder);
		mHolder.setFormat(PixelFormat.TRANSPARENT);
		paint = new Paint(Paint.ANTI_ALIAS_FLAG); //     
		paint.setTextSize(spToPixel(getContext(), 20f));
		paint.setColor(getResources().getColor(R.color.marquee));
		y = getFontHeight(paint);
		canScroll();
	}

	@Override
	public void surfaceCreated(SurfaceHolder holder) {
		isSurfaceValid = true;
	}

	@Override
	public void surfaceDestroyed(SurfaceHolder holder) {
		isSurfaceValid = false;
	}

	class MyThread extends Thread {
		private SurfaceHolder holder;
		public boolean canRun;

		public MyThread(SurfaceHolder holder) {
			this.canRun = true;
			this.holder = holder;
		}

		@Override
		public void run() {
			Canvas c = null;
			while (canRun && isSurfaceValid) {
				try {
					// Thread.sleep(50);
					c = holder.lockCanvas();//     ，                   Canvas，          。
					handlerDrawInternal(c);
				} catch (Exception e) {
					e.printStackTrace();
				} finally {
					if (c != null) {
						holder.unlockCanvasAndPost(c);//       ，     。
					}
				}
				try {
					Thread.sleep(30);
				} catch (InterruptedException e) {
					e.printStackTrace();
				}//      1 

			}

			// reset
			try {
				c = holder.lockCanvas();
				handlerDrawInternal(c);
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				if (c != null) {
					holder.unlockCanvasAndPost(c);
				}
			}
		}
	}

	public void startScroll() {//      
		if (!isSurfaceValid) {
			return;
		}
		// myThread.canRun = true;
		if (!myThread.isAlive()) {
			myThread = new MyThread(mHolder);
			myThread.start();
		}
	}

	public void stopScroll() {//      
		myThread.canRun = false;
		isSurfaceValid = false;
		// myThread.interrupt();
	}

	private void handlerDrawInternal(Canvas canvas) {
		if (canvas == null) {
			return;
		}
		step += speed;
		if (step >= temp_view_plus_two_text_length)//       ，       
			step = textLength;
		canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);
		canvas.drawText(mText, 0, mText.length(), temp_view_plus_text_length - step, y, paint);
	}

	private static float getFontHeight(Paint paint) {//       
		Rect bounds = new Rect();
		paint.getTextBounds(" ", 0, 1, bounds);
		return bounds.height();
	}

	// private static float pixelsToSp(Context context, Float px) {
	// float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;
	// return px / scaledDensity;
	// }

	private static float spToPixel(Context context, Float sp) {
		float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;
		return sp * scaledDensity;
	}

}

 
개인 개발 소프트웨어 다운로드를 환영합니다:http://apk.91.com/Soft/Android/com.yln.game-3-1.1.html
응원해 주셔서 감사합니다!