Android 在现有位图图像上绘制正方形
我有一个位图图像,我想在这个图像上画一个正方形,用于特殊位置,我进行了研究,但没有找到任何解决方案,所有解决方案都是用于在空视图上创建正方形,请建议我是初学者Android 在现有位图图像上绘制正方形,android,Android,我有一个位图图像,我想在这个图像上画一个正方形,用于特殊位置,我进行了研究,但没有找到任何解决方案,所有解决方案都是用于在空视图上创建正方形,请建议我是初学者 public class DrawView extends View { Paint paint = new Paint(); public DrawView(Context context) { super(context); } @Override public v
public class DrawView extends View
{
Paint paint = new Paint();
public DrawView(Context context)
{
super(context);
}
@Override
public void onDraw(Canvas canvas)
{
Paint myPaint = new Paint();
myPaint.setColor(Color.WHITE);
myPaint.setStyle(Paint.Style.STROKE);
myPaint.setStrokeWidth(2);
canvas.drawRect(10, 10, 100, 100, myPaint);
}
}
我应该将位图图像转换为convas吗?如何转换?试试这个,它可以实现您想要的功能,还有更多功能:
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;
public class DrawView extends View {
Paint paint = new Paint();
public DrawView(Context context) {
super(context);
}
@Override
public void onDraw(Canvas canvas) {
paint.setColor(Color.BLACK);
paint.setStrokeWidth(3);
canvas.drawRect(30, 30, 80, 80, paint);
paint.setStrokeWidth(0);
paint.setColor(Color.CYAN);
canvas.drawRect(33, 60, 77, 77, paint );
paint.setColor(Color.YELLOW);
canvas.drawRect(33, 33, 77, 60, paint );
}
}
要绘制它:
导入android.app.Activity;
导入android.graphics.Color;
导入android.os.Bundle
public class StartDraw extends Activity {
DrawView drawView;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
drawView = new DrawView(this);
drawView.setBackgroundColor(Color.WHITE);
setContentView(drawView);
}
}
来源:这可能有帮助