如何将“图像视图”设置为画布并在该画布上绘制

Question

I have many images which I set on imageView by clicking on a Button, I want to create a class of Drawing so that when the image is on ImageView I can paint on it, and after clicking on the button I will be able to drawing on the new image. Till now I have this. Please help me to do this I am new in programming I don't know much. Just a little about OOP and DS.

public class EnglishDrawing extends Activity{
private int currentImage = 0;
private ImageView changeImageView;
private Button changeImageOnClick;
private Button changePreviousImageOnClick;
public Bitmap mybitmap,newbmp,bitmap,bmp;
int image[] = { R.drawable.englishdot_01, R.drawable.englishdot_02,
        R.drawable.englishdot_03, R.drawable.englishdot_04,
        R.drawable.englishdot_05, R.drawable.englishdot_06,R.drawable.englishdot_07,
        R.drawable.englishdot_08,
        R.drawable.englishdot_09,
        R.drawable.englishdot_10,
        R.drawable.englishdot_11,
        R.drawable.englishdot_12,
        R.drawable.englishdot_13,
        R.drawable.englishdot_14,
        R.drawable.englishdot_15,
        R.drawable.englishdot_16,
        R.drawable.englishdot_17,
        R.drawable.englishdot_18,
        R.drawable.englishdot_19,
        R.drawable.englishdot_20,
        R.drawable.englishdot_21,
        R.drawable.englishdot_22,
        R.drawable.englishdot_23,
        R.drawable.englishdot_24,
        R.drawable.englishdot_25,
        R.drawable.englishdot_26

};

@Override
protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.englishdrawing);
    changeImageOnClick = (Button) findViewById(R.id.nextDrawEng);
    changePreviousImageOnClick = (Button) findViewById(R.id.preDrawEng);
    changeImageView = (ImageView) findViewById(R.id.englishdrawingimageview);
    changeImageOnClick.setOnClickListener(aButtonChangeImageListener);
    changePreviousImageOnClick.setOnClickListener(bButtonOnClickListener);
    changeImageView.setDrawingCacheEnabled(true);
}
View.OnClickListener aButtonChangeImageListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        currentImage++;
        currentImage = currentImage % image.length;
        changeImageView.setImageResource(image[currentImage]);
    }
};
View.OnClickListener bButtonOnClickListener = new OnClickListener() {

    @Override
    public void onClick(View v) {
        // TODO Auto-generated method stub
        currentImage--;
        currentImage = (currentImage + image.length) % image.length;
        changeImageView.setImageResource(image[currentImage]);

    }
};

}

Answer 1

You need to load your image as bitmap:

 Resources res = getResources();
 Bitmap bitmap = BitmapFactory.decodeResource(res, R.drawable.your_image);
 canvas.drawBitmap(bitmap , 0,0, null);

You then can draw on the canvas. On click of canvas you get the next image as bitmap just like above and again draw it on canvas.This is how you can draw on image also..!