自定义--进度条

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效果：

----------------布局文件-----------------------

<Button    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:text="点击开始"    android:onClick="start"    /><com.bwei.administrator.view.ProgressView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/progress"    />

=========自定义布局中==============

public class ProgressView extends View{    private  int progress=0;       Handler handler = new Handler(){         @Override         public void handleMessage(Message msg) {             super.handleMessage(msg);              if(msg.what==0){                  if(progress<100){                      progress++;                      //重新绘制                      postInvalidate();                      //重新调用                     sendEmptyMessageDelayed(0,20);                  }              }         }     };    public ProgressView(Context context) {        super(context);    }    public ProgressView(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);    }    public ProgressView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //画一个进度条  首先先画一个圆        Paint paint =new Paint();        paint.setColor(Color.BLACK);        paint.setAntiAlias(true);        paint.setStyle(Paint.Style.STROKE);          canvas.drawCircle(200,200,100,paint);           //画一个代表进度的圆弧        RectF rectF = new RectF(100,100,300,300);          paint.setColor(Color.RED);          paint.setStrokeWidth(5);         canvas.drawArc(rectF,-90,360*progress/100,false,paint);          //画文字        String text =progress+"%";        paint.setColor(Color.BLACK);        paint.setTextSize(40);        paint.setStrokeWidth(1);        paint.setStyle(Paint.Style.FILL);        Rect rect = new Rect();        //测量        paint.getTextBounds(text,0,text.length(),rect);        canvas.drawText(text,200-rect.width()/2,200+rect.height()/2,paint);    }      //对外提供一个启动的方法         public  void start(){             handler.sendEmptyMessageDelayed(0,20);         }}

=============MainActivity中================

progressView = (ProgressView) findViewById(R.id.progress);//点击开始按钮调自定义view中的开始方法

public  void start(View view){    progressView.start();}

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