自定义view画带有进度条的圆

ShanXing 类
public class ShanXing extends View {  

  private int progress = 0;   

  private ProgressUpdateListener listener;   

  interface  ProgressUpdateListener {     

   void onProgressUpdated(int progress);   

 }   

 public void setListener(ProgressUpdateListener listener) {    

    this.listener = listener;   

 }   

 public ShanXing(Context context) {    

           super(context);   

 }   

 public ShanXing(Context context, AttributeSet attrs) {    

         super(context, attrs);  

  }  

  public ShanXing(Context context, AttributeSet attrs, int defStyleAttr) {      

           super(context, attrs, defStyleAttr);   

 }  

  @Override   

 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {    

          super.onMeasure(widthMeasureSpec, heightMeasureSpec);  

  }   

 public int getProgress() {      

      return progress;  

  }   

 public void setProgress(int progress) {      

  this.progress = progress;       

 postInvalidate();       

 if (listener != null) {          

  listener.onProgressUpdated(progress);    

    }  

  }   

 @Override   

 protected void onDraw(Canvas canvas) {       

 super.onDraw(canvas);     

   int width = getWidth();      

  int height = getHeight();       

 // 绘图范围       

 int react = Math.min(width, height);        

// 半径        

int radius = react / 2;       

 // 绘制最外层的大圆       

 Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);       

 paint.setColor(Color.GREEN);      

  paint.setStyle(Paint.Style.STROKE);      

  canvas.drawCircle(radius, radius, radius, paint);     

   paint.reset();        

paint.setStyle(Paint.Style.STROKE);      

  paint.setStrokeWidth(20);      

  paint.setColor(Color.RED);       

 // 画扇形     

 canvas.drawArc(new RectF(10, 10, react-10, react-10), -90, progress*360/100, true, paint);      

  // 画内层的小圆       

 paint.reset();       

 paint.setColor(Color.WHITE);       

 paint.setStyle(Paint.Style.FILL_AND_STROKE);       

 canvas.drawCircle(radius, radius, radius - 20, paint);        

// 画进度文字        

paint.reset();        

paint.setColor(Color.BLUE);       

paint.setTextSize(40);        

Rect rect = new Rect();      

  paint.getTextBounds(progress + "", 0, String.valueOf(progress).length(),                rect);        int textWidth = rect.width();     

   int textHeight = rect.height();      

  canvas.drawText(progress + "", radius-textWidth/2, radius-textHeight/2, paint);  

  }   

 @Override  

  protected void onLayout(boolean changed, int left, int top, int right, int bottom) {   

     super.onLayout(changed, left, top, right, bottom);  

  }    

@Override    

public boolean onTouchEvent(MotionEvent event) {     

   return super.onTouchEvent(event);   

 }

}

主类

public class MainActivity extends AppCompatActivity {  private ShanXing shanXing;    private Button btn;    private static final int FLAG = 0x123;    private Handler handler = new Handler() {        @Override        public void handleMessage(Message msg) {            super.handleMessage(msg);            switch (msg.what) {                case FLAG:                    int progress = shanXing.getProgress();                    progress += 10;                    if (progress > 100) {                        progress = 0;                    }                    shanXing.setProgress(progress);                    handler.sendEmptyMessageDelayed(FLAG, 1000);                    break;            }        }    };    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        btn = (Button) findViewById(R.id.btn);        shanXing = (ShanXing) findViewById(R.id.shan);        btn.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View view) {                handler.sendEmptyMessageDelayed(FLAG, 1000);            }        });        shanXing.setListener(new ShanXing.ProgressUpdateListener(){            @Override            public void onProgressUpdated(int progress) {                if (progress >= 100) {//                    handler.remove;                    //跳转                    /*startActivity(new Intent(MainActivity.this, ScanActivity.class));*/                    Toast.makeText(MainActivity.this,"完成",Toast.LENGTH_SHORT).show();                }            }        });    }    @Override    protected void onStop() {        super.onStop();        handler.removeMessages(FLAG);    }}
主
<test.bwie.com.shanxing.ShanXing    android:id="@+id/shan"    android:layout_width="match_parent"    android:layout_height="80dp" />    <Button        android:id="@+id/btn"        android:layout_width="match_parent"        android:layout_height="30dp" />
布局