2022-06-22 09:58:01 来源 : 软件开发网
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本文实例为大家分享了Android自定义加载圈的具体代码，供大家参考，具体内容如下
public class LoadingView extends LinearLayout { public LoadingView(Context context) { this(context, null); } public LoadingView(Context context, @Nullable AttributeSet attrs) { this(context, attrs, 0); } public LoadingView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); setOrientation(VERTICAL); setGravity(Gravity.CENTER); setBackgroundResource(R.drawable.loadingsp); LoadView loading = new LoadView(getContext()); loading.setLayoutParams(new ViewGroup.LayoutParams(200, 200)); addView(loading); TextView tv = new TextView(getContext()); tv.setText("正在加载中"); LinearLayout.LayoutParams layoutParams = new LayoutParams(-2, -2); layoutParams.setMargins(0, 10, 0, 0); tv.setLayoutParams(layoutParams); tv.setGravity(Gravity.CENTER); tv.setTextColor(Color.WHITE); addView(tv); } class LoadView extends View { Paint mPaint; private int mWidth; private int mHeight; private int mCurrentIndex = 0; private int count = 12; public LoadView(Context context) { super(context); mPaint = new Paint(); mPaint.setAntiAlias(true); mPaint.setStyle(Paint.Style.FILL); mPaint.setStrokeWidth(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 3, getResources().getDisplayMetrics())); mPaint.setColor(Color.WHITE); } @Override protected void onDraw(Canvas canvas) { super.onDraw(canvas); if (mCurrentIndex >= count) { mCurrentIndex = 0; } int endAlpha = 255 / count; for (int i = 0; i < count; i++) { int alpha; if (mCurrentIndex - i > 0) { alpha = endAlpha * (mCurrentIndex - i); } else { alpha = 255 - 255 / count * (i - mCurrentIndex); } mPaint.setColor(Color.argb(alpha, 255, 255, 255)); canvas.drawLine(mWidth / 2, 0, mWidth / 2, TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 20, getResources().getDisplayMetrics()), mPaint); canvas.rotate(360 / count, mWidth / 2, mHeight / 2); } mCurrentIndex++; postInvalidateDelayed(100); } @Override protected void onSizeChanged(int w, int h, int oldw, int oldh) { super.onSizeChanged(w, h, oldw, oldh); mWidth = getWidth(); mHeight = getHeight(); } }} 
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