SurfaceView双缓冲技术引入

大富大贵7

于 2022-12-20 08:12:48 发布

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CC 4.0 BY-SA版权

文章标签：经验分享

本文链接：https://blog.youkuaiyun.com/Sapphire521/article/details/128379770

本文介绍了一个自定义的DoubleBufferingTextView组件，它通过双缓冲技术实现实时绘制文本，每秒更新10次，展示了Android开发中如何使用SurfaceView和线程同步进行高效文本渲染。

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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();
}

}