如何创建构造函数以便我可以传递值

Question

如何将浮点值从 Main Activity 传递给其他对象，或者如何为 canvas 创建构造函数在给定 java class 的位图构造函数上绘制。我想将此值传递或设置为例如：X=40, Y=30 并在 DrawOnCanvas 的覆盖方法中分配它 canvas.drawBitmap（位图，X，Y，空）；我有一个来自 github 的实现需要在这个 class:

中实现这些值

public class WatermarkFilter extends GlOverlayFilter {

private Bitmap bitmap;
private Position position = Position.LEFT_TOP;
private Canvas canvas;


public WatermarkFilter(Bitmap bitmap) {
    this.bitmap = bitmap;
}


public WatermarkFilter(Bitmap bitmap, Position position) {
    this.bitmap = bitmap;
    this.position = position;
}


@Override
protected void drawCanvas(Canvas canvas) {
    if (bitmap != null && !bitmap.isRecycled()) {
        switch (position) {
            case LEFT_TOP:
                canvas.drawBitmap(bitmap, "X", "Y", null);
                break;     
            case RIGHT_BOTTOM:
                canvas.drawBitmap(bitmap, canvas.getWidth() - bitmap.getWidth(), canvas.getHeight() - bitmap.getHeight(), null);
                break;
        }
    }
}

public enum Position {
    LEFT_TOP,
    LEFT_BOTTOM,
    RIGHT_TOP,
    RIGHT_BOTTOM
}

}

来自我使用此方法的 MainClass 方法：

 float X = sticker.getMappedBoundPoints()[0];
   float Y = sticker.getMappedBoundPoints()[1];
    Log.d(TAG, "SavedVideo: " + "X" + X + "?/" + "Y" + Y);
 mp4Composer = new Mp4Composer(inputVideoPath, videoPath)
            .rotation(Rotation.ROTATION_270)
            .size(720, 720)
            .filter(new WatermarkFilter(BitmapFactory.decodeResource(mContext.getResources(),R.drawable.ic_launcher_sample),WatermarkFilter.Position.LEFT_TOP))

Answer 1

根据你的问题，我假设你想在 Canvas 方法中设置 X 和 Y 浮点值如此简单地创建一个像

这样的构造函数

public WatermarkFilter(Bitmap bitmap, Float x, Float y) {
    this.bitmap = bitmap;
    X = x;
    Y = y;
 }

并在Override方法中设置：

@Override
protected void drawCanvas(Canvas canvas) {

    if (bitmap != null && !bitmap.isRecycled()) {

       canvas.drawBitmap(bitmap,X,Y,null);

在您的 MainActivity 中：

filter(new WatermarkFilter(BitmapFactory.decodeResource(mContext.getResources(),R.drawable.ic_launcher_sample),X,Y))

如何创建构造函数以便我可以传递值

How to create a Constructor so that i can pass the value

java

android

android-canvas