Anroid自定义View-绘制圆环

Posted 2022-12-09 yayun0516

自定义View代码如下：

public class CircleProgress extends View 

    private Paint mPaint;
    private int mWidth;
    private int mHeight;
    private static final int RING_WIDTH =80;

    public CircleProgress(Context context) 
        super(context);
        initPaint();
    

    private void initPaint() 
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setColor(Color.YELLOW);
    

    public CircleProgress(Context context, AttributeSet attrs) 
        super(context, attrs);
        initPaint();
    

    @Override
    protected void onDraw(Canvas canvas) 
        super.onDraw(canvas);
        mWidth = getWidth();
        mHeight = getHeight();
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeWidth(RING_WIDTH);
        canvas.drawCircle(mWidth / 2, mHeight / 2, 100, mPaint);
    

 

MainActivity.java代码如下：

 

public class MainActivity extends AppCompatActivity 

    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(new CircleProgress(this));
    

 

运行实例如下：