Question

我试图找到ImageView的黑色点。我正在使用png图像。虽然ImageView的高度大于我传递的y的值。但仍然会发生异常。你能帮我辨认一下我的错误吗？

public class MainActivity extends ActionBarActivity {
List<Point> points = new ArrayList<Point>();

TextView textView;
ImageView imageView;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    imageView = (ImageView)findViewById(R.id.imageView1);

    //textView = (TextView)findViewById(R.id.textView1);

}

@Override
public void onWindowFocusChanged (boolean hasFocus){
    super.onWindowFocusChanged(hasFocus);
    if(hasFocus){
        int top= imageView.getTop();
        int left= imageView.getLeft();
        int right= imageView.getRight();
        int bottom = imageView.getBottom();
        Bitmap bitmap = ((BitmapDrawable)imageView.getDrawable()).getBitmap();
        for(int x=left; x<right; x++)
        {
            for(int y=top; y<bottom; y++)
            {
                int pixel = bitmap.getPixel(x, y);
                if(pixel==color.black)
                {
                    Point point=new Point();
                    point.x=x;
                    point.y=y;
                    points.add(point);
                }
            }
        }
        //textView.setText("Starting points: " + top + "," + left + " Ending Points:" + right + ","+ bottom);


    }
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {

    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

class Point {
    float x, y;

@Override
public String toString() {
    return x + ", " + y;
}

}

}

Answer 1

你不需要在0开始x和y，然后迭代到bitmap.Width和bitmap.Height？您正在使用imageView获取尺寸，这将与位图不同。

java.lang.IllegalArgumentException：y必须是＆lt; bitmap.height（）在尝试获取黑色的ImageView的点时

1 个答案: