創建自定義視圖

Question

我試圖達到使用自定義形狀（幾乎矩形）創建視圖的效果。

這裏是我試圖做的：

public class CustomHeaderview extends View { 

    public CustomHeaderview(Context context) { 
     super(context); 
    } 

    public CustomHeaderview(Context context, AttributeSet attrs) { 
     super(context, attrs); 
    } 

    public CustomHeaderview(Context context, AttributeSet attrs, int defStyle) { 
     super(context, attrs, defStyle); 
    } 

    Paint paint = new Paint(); 

    @Override 
public void draw(Canvas canvas) { 
    paint.setColor(Color.GRAY); 
    paint.setStyle(Style.FILL); 

    Path wallpath = new Path(); 
    wallpath.reset(); // only needed when reusing this path for a new build 
    wallpath.moveTo(100, 100); // used for first point 
    wallpath.lineTo(100, 200); 
    wallpath.lineTo(200, 200); 
    wallpath.lineTo(150, 100); 
    wallpath.lineTo(100, 100);// there is a setLastPoint action but i found it not to work as expected 

    canvas.drawPath(wallpath, paint); 
    super.draw(canvas); 
} 

} 

和XML：

<CustomHeaderview 
      android:layout_width="152dp" 
      android:layout_height="152dp" /> 

編輯 由於梅德，它完美的作品吧！

Answer 1

您提供看中座標爲您矩形：

x1: 100 
y1: 100 
x2: 100 
y2: 120 

所以，你要矩形0寬度，這就是爲什麼它是無形的。