Android橢圓形2色

Question

我有一個線性佈局視圖，其背景我已設置爲橢圓形純色。到目前爲止，我的背景是圓圈。現在我想要達到同樣的效果，即使用可繪製的形狀來獲得2色的圓。請參照附件。

Answer 1

在繪製文件夾 shape.xml創建shape.xml：

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
android:shape="oval" > 
<gradient android:startColor="#0000FF" android:endColor="#00FF00" 
android:angle="270"/> 
</shape> 

Answer 2

這可能來晚了，但我已經很難找到很好的答案，以便聽到我服食。

我使用自定義drawable繪製圓形，並使用由位置數組配置的LinearGradient着色器不具有漸變過渡。梯度線方向在LinearGradient構造函數中進行配置（這裏是對角線）。

public class MultiColorCircleDrawable extends Drawable { 

    private Paint paint; 
    private int[] colors; 

    public MultiColorOvalDrawable(int[] colors) { 
     this.colors = colors; 
    } 

    private void init() { 
     paint = new Paint(); 
     paint.setShader(createShader()); 
    } 

    private Shader createShader() { 
     int[] colorsArray = new int[colors.length * 2]; 
     float[] positions = new float[colors.length * 2]; 

     for (int i = 0; i < colors.length; i++) { 
      int y = i * 2; 
      int color = colors[i]; 
      colorsArray[y] = color; 
      colorsArray[y+1] = color; 
      positions[y] = 1f/colors.length * i; 
      positions[y+1] = 1f/colors.length * (i+1); 
     } 

     Rect bounds = getBounds(); 
     int width = bounds.right - bounds.left; 
     int height = bounds.bottom - bounds.top; 

     return new LinearGradient(0, 0, width, height, colorsArray, positions, Shader.TileMode.REPEAT); 
    } 

    @Override 
    public void draw(Canvas canvas) { 
     if (null == paint) { 
      init(); 
     } 

     Rect bounds = getBounds(); 
     int width = bounds.right - bounds.left; 
     int height = bounds.bottom - bounds.top; 
     canvas.drawCircle(width/2, height/2, (width/2) - strokeWidth, maskPaint); 
    } 

    @Override 
    public void setAlpha(int i) { 

    } 

    @Override 
    public void setColorFilter(ColorFilter colorFilter) { 

    } 

    @Override 
    public int getOpacity() { 
     return PixelFormat.OPAQUE; 
    } 
} 

Answer 3

<?xml version="1.0" encoding="utf-8"?> 
<shape xmlns:android="http://schemas.android.com/apk/res/android" 
    android:shape="oval"> 

    <gradient 
     android:centerX="-1" 
     android:type="sweep" 
     android:startColor="color1" 
     android:endColor="color2" 
     /> 

</shape>