学步园

1 在 res/value 目录下创建 attrs.xml 文件 定义类似：

 <?xml version="1.0" encoding="utf-8"?>  

<resources>  
     <declare-styleable name="GameView">  
        <attr name="text" format="string" />  
    </declare-styleable>  
</resources>  

 

2 定义 

 

public class GameView extends View {
    private String ss;
    public GameView(Context context) {
        super(context);
        // TODO Auto-generated constructor stub
    }
    public GameView(Context context, AttributeSet attrs) {
        super(context, attrs);
        TypedArray ta = context.obtainStyledAttributes(attrs,
                R.styleable.GameView);
        int n = ta.getIndexCount();
        for (int i = 0; i < n; i++) {
            int attr = ta.getIndex(i);
            switch (attr) {
            case R.styleable.GameView_text:
                ss = ta.getString(R.styleable.GameView_text);
                break;
            default:
                break;
            }
        }
    }
	 @Override  
	    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  
	        setMeasuredDimension(measureWidth(widthMeasureSpec),  
	                measureHeight(heightMeasureSpec));  
	    }  

	 private int measureWidth(int measureSpec) {  
	        int result = 300;  
	        int specMode = MeasureSpec.getMode(measureSpec);  
	        int specSize = MeasureSpec.getSize(measureSpec);  
	  
	        if (specMode == MeasureSpec.EXACTLY) {  
	            result = specSize;  
	        } else {  
	            result = 300;
	            if (specMode == MeasureSpec.AT_MOST) {  
	                result = Math.min(result, specSize);  
	            }  
	        }  
	        return result;  
	    }  
	  
	    /** 
	     * Determines the height of this view 
	     * @param measureSpec A measureSpec packed into an int 
	     * @return The height of the view, honoring constraints from measureSpec 
	     */  
	    private int measureHeight(int measureSpec) {  
	        int result = 300;  
	        int specMode = MeasureSpec.getMode(measureSpec);  
	        int specSize = MeasureSpec.getSize(measureSpec);
	        if (specMode == MeasureSpec.EXACTLY) { 
	            result = specSize;  
	        } else {  
	            result = 300;
	            if (specMode == MeasureSpec.AT_MOST) {  
	                result = Math.min(result, specSize);  
	            }  
	        }  
	        return result;  
	    }
    int miCount = 0;
    int y = 0;
    @Override
    protected void onDraw(Canvas canvas) {
        // TODO Auto-generated method stub
        if (miCount < 100) {
            miCount++;
        } else {
            miCount = 0;
        }
        Paint mPaint = new Paint();
        switch (miCount % 4) {
        case 0:
            mPaint.setColor(Color.BLUE);
            break;
        case 1:
            mPaint.setColor(Color.GREEN);
            break;
        case 2:
            mPaint.setColor(Color.RED);
            break;
        case 3:
            mPaint.setColor(Color.YELLOW);
            break;
        default:
            mPaint.setColor(Color.WHITE);
            break;
        }
        canvas.drawRect((320 - 80) / 2, y, (320 - 80) / 2 + 80, y + 40, mPaint);
        canvas.drawText(ss, 150, 150, mPaint);
    }
}

  

3 使用GameView

 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res/eas.org"
    android:layout_width="wrap_content" android:layout_height="wrap_content">
    <eas.org.GameView android:layout_width="wrap_content" app:text="wangtian"
        android:layout_height="wrap_content" />
</LinearLayout>