sketch生成android代码,java – 从Android Processing Sketch保存图像

我正在尝试从我的

Android Processing草图中保存图像,但是我收到错误.如何将草图保存到用户手机图库中的图像文件？

public void draw(){

beginShape();

for (int i=0; i

d[i].maison();

int stroke1 = (int) random(255);

int stroke2 = (int) random(255);

int stroke3 = (int) random(255);

stroke(stroke1, stroke2, stroke3);

noFill();

vertex(d[i].x , d[i].y);

}

endShape(CLOSE);

UUID idOne = UUID.randomUUID();

save(idOne + ".tga");

}

错误：

09-15 23:47:25.939 23317-23389/tutorials.androidstudio.fragmentsv3

E/AndroidRuntime: FATAL EXCEPTION: Animation Thread

Process: tutorials.androidstudio.fragmentsv3, PID: 23317

java.lang.NullPointerException: Attempt to invoke virtual method ‘java.io.File

android.app.Activity.getFileStreamPath(java.lang.String)’ on a null

object reference

at processing.core.PApplet.sketchPath(Unknown Source)

at processing.core.PApplet.savePath(Unknown Source)

at processing.core.PApplet.save(Unknown Source)

at tutorials.androidstudio.fragmentsv3.Sketch$override.draw(Sketch.java:74)

at tutorials.androidstudio.fragmentsv3.Sketch$override.access$dispatch(Sketch.java)

at tutorials.androidstudio.fragmentsv3.Sketch.draw(Sketch.java:0)

at processing.core.PApplet.handleDraw(Unknown Source)

at processing.core.PGraphicsAndroid2D.requestDraw(Unknown Source)

at processing.core.PApplet.run(Unknown Source)

at java.lang.Thread.run(Thread.java:818)

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