//布局文件
<Button android:id="@+id/button" android:layout_width="match_parent" android:layout_height="wrap_content" android:text="开始下载" android:onClick="start" /> <com.bw.u.jindutiaojiazai.MyView android:id="@+id/circleView" android:layout_width="100dp" android:layout_height="100dp" android:layout_marginLeft="126dp" android:layout_marginStart="126dp" android:layout_below="@+id/button" android:layout_alignParentLeft="true" android:layout_alignParentStart="true" android:layout_marginTop="131dp" /> //MainAcivity代码
public class MainActivity extends AppCompatActivity { private MyView circleView; int progress = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); circleView = (MyView) findViewById(R.id.circleView); } public void start(View v) { // 1000公里 circleView.setMax(100); progress=0; new Thread() { public void run() { while (true) { progress = progress + 1; String text = progress + "%"; circleView.setProgressAndText(progress, text); try { sleep(30); } catch (InterruptedException e) { e.printStackTrace(); } if (progress == 100) { break; } } }; }.start(); } } //自定义控件的类
public class MyView extends View{ int x; int y; int progress = 0; private String text="0%"; private int max = 100; public MyView(Context context) { super(context); } public MyView(Context context, AttributeSet attrs) { super(context, attrs); } public MyView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } protected void onDraw(Canvas canvas) { super.onDraw(canvas); // 对于画笔 Paint paint = new Paint(); // 设置抗锯齿 paint.setAntiAlias(true); // 设置画笔颜色 // 三种样式--Stroke 只要描边 Fill 填充 FILL_AND_STROKE和既有描边又有填充 paint.setStyle(Paint.Style.STROKE); // canvas.drawArc(oval, 0, 360 * progress / max, false, paint); //设置描边宽度 paint.setStrokeWidth(2); //定义外圈员的颜色 paint.setColor(Color.RED); //绘制圆形进度条--获取当前控件多大，正好让进度条在这个控件区间内 canvas.drawCircle(getMeasuredWidth()/2, getMeasuredWidth()/2, getMeasuredWidth()/2, paint); //重新设置描边宽度，这个宽度最好能完全盖过圆形 paint.setStrokeWidth(3); //定义限制圆弧的矩形，当前这样定义正好让圆弧和圆重合 RectF oval = new RectF(0, 0, getMeasuredWidth(), getMeasuredWidth()); //设置进度条（圆弧的颜色） paint.setColor(Color.GREEN); //绘制，设置进度条的度数从0开始，结束值是个变量，可以自己自由设置，来设置进度 //true和false 代表是否使用中心点，如果true，代表连接中心点，会出现扇形的效果 canvas.drawArc(oval, 0, 360 * progress / max, false, paint); //文字的绘制 paint.setTextSize(40); //设置文字宽度 paint.setStrokeWidth(1.0f); //测量文字大小-提前准备个矩形 Rect bounds = new Rect(); //测量文字的宽和高，测量的值可以根据矩形获取 paint.getTextBounds(text, 0, text.length(), bounds); paint.setColor(Color.BLACK); paint.setStyle(Paint.Style.STROKE); //绘制文字，计算文字的宽高进行设置 canvas.drawText(text, getMeasuredWidth()/2 - bounds.width() / 2, getMeasuredWidth()/2 + bounds.height() / 2, paint); } /** * 初始设置当前进度的最大值-默认100 * @param max */ public void setMax(int max) { this.max = max; } public void setProgressAndText(int progress, String text) { this.progress = progress; this.text = text; //重新绘制 postInvalidate(); } public boolean onTouchEvent(MotionEvent event) { this.x= (int) event.getX(); this.y= (int) event.getY(); this.invalidate(); return true; } }
