自定义全屏loadview

导航刚刚打开的时候，如果等待时间比较长，那是一个不好的用户体验。所以此时设置一个加载的界面比较合适。话不多说，上代码

使用时候直接调用 main_loading.start 和main_loading.stop

1----自定义view

public class LoadingView extends View {

private Paint mPaint;

private int mAngle;

private float mRadius;

private int mWidth, mHeight;

private boolean startFlag = true;

public void start() {

if (startFlag) return;

startFlag = true;

invalidate();

setVisibility(View.VISIBLE);

}

public void stop() {

startFlag = false;

invalidate();

mAngle = 0;

setVisibility(View.GONE);

}

public LoadingView(Context context) {

super(context);

}

public LoadingView(Context context, AttributeSet attrs, int defStyle) {

super(context, attrs, defStyle);

}

public LoadingView(Context context, AttributeSet attrs) {

super(context, attrs);

mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);

mPaint.setColor(getResources().getColor(R.color.loading_blue));

mPaint.setStyle(Paint.Style.FILL_AND_STROKE);

mPaint.setStrokeWidth(4);

stop();

}

@Override

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

mWidth = right - left;

mHeight = bottom - top;

mRadius = Math.min(mWidth, mHeight) / 2f;

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

}

@Override

protected void onDraw(Canvas canvas) {

if (!startFlag)  return;

super.onDraw(canvas);

canvas.translate(mWidth / 2f - mRadius, mHeight / 2f - mRadius);

canvas.rotate(mAngle, mRadius, mRadius);

for (int i = 0; i < 12; i++) {

mPaint.setAlpha((int) Math.max(255 * 0.1f, 255 * (9 - i) / 10f));

canvas.drawCircle(mRadius, Math.max(6, 20 - i * 2), Math.max(3, 10 - i), mPaint);

canvas.rotate(-30, mRadius, mRadius);

}

mAngle += 30;

postInvalidateDelayed(80);

}

}

2---引用view