android 字体特效,android 自定义 TextView 点击字体镂空效果

public class ShowPalettePageTextView extends View {

public static final int BACKGROUND_COLOR = MyApp.getAppColor(R.color.color_dialog_text_content);

private static final int DEFAULT_RADIUS = MyApp.getAppDimen(R.dimen.default_radio_size);

private TextPaint mTextPaint;

private Paint mBackgroundPaint;

private RectF mBackgroundRect;

private boolean isPressed = false;

private String mShowPageText;

private Xfermode xfermode = new PorterDuffXfermode(PorterDuff.Mode.CLEAR);

public ShowPalettePageTextView(Context context) {

this(context, null);

}

public ShowPalettePageTextView(Context context, AttributeSet attrs) {

this(context, attrs, -1);

}

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

super(context, attrs, defStyleAttr);

mTextPaint = new TextPaint();

mTextPaint.setAntiAlias(true);

mTextPaint.setColor(BACKGROUND_COLOR);

mTextPaint.setTextSize(MyApp.getAppDimen(R.dimen.text_size));

mBackgroundPaint = new Paint();

mBackgroundPaint.setColor(BACKGROUND_COLOR);

mBackgroundPaint.setAntiAlias(true);

mBackgroundRect = new RectF();

}

@Override

protected void onSizeChanged(int width, int height, int oldw, int oldh) {

super.onSizeChanged(width, height, oldw, oldh);

mBackgroundRect.set(0, 0, width, height);

}

public void setText(String showPageText) {

this.mShowPageText = showPageText;

invalidate();

}

@Override

protected void onDraw(Canvas canvas) {

drawBackground(canvas);

drawText(canvas);

}

private void drawBackground(Canvas canvas) {

if (isPressed) {

mBackgroundPaint.setStyle(Paint.Style.FILL);

} else {

mBackgroundPaint.setStyle(Paint.Style.STROKE);

}

canvas.drawRoundRect(mBackgroundRect, DEFAULT_RADIUS, DEFAULT_RADIUS, mBackgroundPaint);

}

private void drawText(Canvas canvas) {

if (mShowPageText == null) {

return;

}

if (isPressed) {

mTextPaint.setXfermode(xfermode);

} else {

mTextPaint.setXfermode(null);

}

float x = mBackgroundRect.width() / 2 - mTextPaint.measureText(mShowPageText) / 2;

float y = mBackgroundRect.top + mBackgroundRect.height() / 2 + mTextPaint.getTextSize() / 3;

canvas.drawText(mShowPageText, x, y, mTextPaint);

}

@SuppressLint("ClickableViewAccessibility")

@Override

public boolean onTouchEvent(MotionEvent event) {

if (event.getAction() == MotionEvent.ACTION_DOWN) {

isPressed = true;

invalidate();

} else if (event.getAction() == MotionEvent.ACTION_UP) {

isPressed = false;

invalidate();

}

return super.onTouchEvent(event);

}

}