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  • SurfaceView双缓冲技术引入

    package com.loaderman.customviewdemo;
    
    import android.content.Context;
    import android.graphics.Canvas;
    import android.graphics.Color;
    import android.graphics.Paint;
    import android.util.AttributeSet;
    import android.view.SurfaceHolder;
    import android.view.SurfaceView;
    
    
    public class DoubleBufferingTextView extends SurfaceView {
        private Paint mPaint;
    
        public DoubleBufferingTextView(Context context) {
            super(context);
            init();
        }
    
        public DoubleBufferingTextView(Context context, AttributeSet attrs) {
            super(context, attrs);
            init();
        }
    
        public DoubleBufferingTextView(Context context, AttributeSet attrs, int defStyle) {
            super(context, attrs, defStyle);
            init();
        }
    
        private void init() {
            mPaint = new Paint();
            mPaint.setColor(Color.RED);
            mPaint.setTextSize(30);
    
            getHolder().addCallback(new SurfaceHolder.Callback() {
                @Override
                public void surfaceCreated(SurfaceHolder holder) {
    
                    drawText(holder);
                }
    
                @Override
                public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
    
                }
    
                @Override
                public void surfaceDestroyed(SurfaceHolder holder) {
    
                }
            });
        }
    
        private void drawText(final SurfaceHolder holder) {
            new Thread(new Runnable() {
                @Override
                public void run() {
                    for (int i = 0; i < 10; i++) {
                        Canvas canvas = holder.lockCanvas();
                        if (canvas != null) {
                            canvas.drawText(i + "", i * 30, 50, mPaint);
                        }
                        holder.unlockCanvasAndPost(canvas);
    
                        try {
                            Thread.sleep(800);
                        } catch (Exception e) {
                            e.printStackTrace();
                        }
                    }
                }
            }).start();
        }
    
    }

    效果:

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  • 原文地址:https://www.cnblogs.com/loaderman/p/10232168.html
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