surfaceview 如何显示矢量图
时间: 2024-04-10 19:28:04 浏览: 11
要在SurfaceView上显示矢量图,可以使用Canvas和Path对象进行绘制。以下是一个简单的示例代码:
首先,创建一个自定义的SurfaceView类,并重写其onDraw方法:
```java
public class VectorSurfaceView extends SurfaceView implements SurfaceHolder.Callback {
private SurfaceHolder mHolder;
private Paint mPaint;
private Path mPath;
public VectorSurfaceView(Context context) {
super(context);
init();
}
public VectorSurfaceView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
mHolder = getHolder();
mHolder.addCallback(this);
mPaint = new Paint();
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.STROKE);
mPaint.setStrokeWidth(5);
mPath = new Path();
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
drawVector();
}
@Override
public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
// Not used
}
@Override
public void surfaceDestroyed(SurfaceHolder holder) {
// Not used
}
private void drawVector() {
Canvas canvas = mHolder.lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.WHITE);
// 绘制矢量图
mPath.moveTo(100, 100);
mPath.lineTo(200, 200);
mPath.lineTo(300, 100);
canvas.drawPath(mPath, mPaint);
mHolder.unlockCanvasAndPost(canvas);
}
}
}
```
然后,在你的Activity或布局文件中使用这个自定义的SurfaceView:
```xml
<com.example.VectorSurfaceView
android:layout_width="match_parent"
android:layout_height="match_parent" />
```
这样,当SurfaceView创建并显示出来时,它将绘制一个简单的矢量图形。你可以根据需要修改绘制的路径和样式。