385841539 / marqueeview Goto Github PK

E/MarqueeView: onDraw: ---5802--------1165486.0------200
E/MarqueeView: onDraw: ---5802--------1165492.0------200
E/MarqueeView: onDraw: ---5802--------1165494.0------200

private String string;//最终绘制的文本
private float speed = 1;//移动速度
private int textColor = Color.BLACK;//文字颜色,默认黑色
private float textSize = 12;//文字颜色,默认黑色
private float startLocationDistance = 0.5f;//开始的位置选取，百分比来的，距离左边，0~1，0代表不间距，1的话代表，从右面，1/2代表中间。
private int itemDistance = 4; //默认item间隔4个空格

private boolean hasShadow = false;
private float shadowDy = 0f;
private float shadowDx = 0f;
private float shadowRadius = 0f;
private int shadowColor = Color.BLACK;

private boolean isResetLocation = true;//默认为true
private float xLocation = 0;//文本的x坐标
private int contentWidth;//内容的宽度

private volatile boolean isRoll = false;//是否继续滚动

private TextPaint paint;//画笔
private Rect rect;

private boolean resetInit = true;

private String content = "";

private float textHeight;


private Handler mHandler = new Handler(new Handler.Callback() { //替换Thread,采用handler,推荐使用 WeakHandler,这里就不更换了
    @Override
    public boolean handleMessage(Message msg) {
        if (msg.what == 1) {
            if (isRoll && !TextUtils.isEmpty(content)) {
                xLocation = xLocation - speed;
                postInvalidate();//每隔10毫秒重绘视图
                mHandler.sendEmptyMessageDelayed(1, 30);
            }
            return true;
        }
        return false;

    }
});


public MarqueeView(Context context) {
    this(context, null);
}

public MarqueeView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
}

public MarqueeView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initAttrs(attrs);
    initPaint();
}

@SuppressLint("RestrictedApi")
private void initAttrs(AttributeSet attrs) {
    TintTypedArray tta = TintTypedArray.obtainStyledAttributes(getContext(), attrs,
            R.styleable.MarqueeView);

    textColor = tta.getColor(R.styleable.MarqueeView_marqueeview_text_color, textColor);
    isResetLocation = tta.getBoolean(R.styleable.MarqueeView_marqueeview_is_resetLocation, isResetLocation);
    speed = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_speed, speed);
    textSize = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_size, textSize);
    startLocationDistance = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_startlocationdistance, startLocationDistance);
    itemDistance = tta.getInt(R.styleable.MarqueeView_marqueeview_text_distance, itemDistance);
    hasShadow = tta.getBoolean(R.styleable.MarqueeView_marqueeview_text_shadow, false);
    shadowDx = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_shadow_dx, 0);
    shadowDy = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_shadow_dy, 0);
    shadowRadius = tta.getFloat(R.styleable.MarqueeView_marqueeview_text_shadow_radius, 0);
    shadowColor = tta.getColor(R.styleable.MarqueeView_marqueeview_text_shadow_color, shadowColor);
    tta.recycle();
}


/**
 * 刻字机修改
 */
private void initPaint() {
    rect = new Rect();
    paint = new TextPaint(Paint.ANTI_ALIAS_FLAG);//初始化文本画笔
    paint.setStyle(Paint.Style.FILL);
    paint.setColor(textColor);//文字颜色值,可以不设定
    paint.setTextSize(PixelUtil.sp2px(textSize));//文字大小
    if (hasShadow) {
        paint.setShadowLayer(shadowRadius, shadowDx, shadowDy, shadowColor);
    }
}


@Override
protected void onDraw(Canvas canvas) {
    super.onDraw(canvas);
    if (resetInit) {
        if (startLocationDistance < 0) {
            startLocationDistance = 0;
        } else if (startLocationDistance > 1) {
            startLocationDistance = 1;
        }
        xLocation = startLocationDistance;
        resetInit = false;
    }
    if (isRoll) {
        if (xLocation <= -(contentWidth + getBlankWidth() * itemDistance)) {
            xLocation = xLocation + contentWidth + getBlankWidth() * itemDistance;
            string = string + content;
            //调用pattern.quote ,防止replaceFirst中含有特殊字符比如完整的(),导致的crash
            string = string.replaceFirst(pattern.quote(""+content), "");   //修改内存问题,防止文字长度不断增加导致内存溢出的情况,
        }
    }

    //把文字画出来
    if (string != null) {
        canvas.drawText(string, xLocation, getHeight() / 2 + textHeight / 2, paint);
    }

}

/**
 * 继续滚动
 */
public void continueRoll() {
    postInvalidate();
    mHandler.removeMessages(1);
    isRoll = true;
    mHandler.sendEmptyMessage(1);
}

/**
 * 停止滚动
 */
public void stopRoll() {
    isRoll = false;
    resetInit = true;
    mHandler.removeMessages(1);
    postInvalidate();
}

public void setTextColor(int color) {
    textColor = color;
    paint.setColor(color);
    postInvalidate();
}

private float getContentWidth(String black) {
    if (TextUtils.isEmpty(black)) {
        return 0;
    }

    if (rect == null) {
        rect = new Rect();
    }
    paint.getTextBounds(black, 0, black.length(), rect);
    textHeight = getContentHeight();

    return rect.width();
}

/**
 * http://blog.csdn.net/u014702653/article/details/51985821
 * 详细解说了
 *
 * @param
 * @return
 */
private float getContentHeight() {
    Paint.FontMetrics fontMetrics = paint.getFontMetrics();
    return Math.abs((fontMetrics.bottom - fontMetrics.top)) / 2;
}


/**
 * 计算出一个空格的宽度
 */
private float getBlankWidth() {
    String text1 = "en en";
    String text2 = "enen";
    return getContentWidth(text1) - getContentWidth(text2);

}

/**
 * 添加文字
 * @param content 显示文字的内容
 * @param needRoll 是否需要滚动,如果不需要,就把文字定位到startLocationDistance的位置,而且不重复
 */
public void setContent(String content, boolean needRoll) {
    if (TextUtils.isEmpty(content)) {
        return;
    }

    isResetLocation = true;
    resetInit = true;
    if (needRoll) {
        for (int i = 0; i < itemDistance; i++) {
            content = content + " ";
        }
        this.content = content;
        contentWidth = (int) (getContentWidth(content));//可以理解为一个单元内容的长度
        int contentCount = (getWidth() / contentWidth) + 2;
        this.string = "";
        for (int i = 0; i <= contentCount + 2; i++) {
            this.string = String.format("%s%s", this.string, this.content);//根据重复次数去叠加。
        }
        postInvalidate();
    } else {
        stopRoll();
        resetInit = true;
        getContentWidth(content);
        this.content = content;  //如果不需要滚动,就直接走这里了
        this.string = content;
        postInvalidate();
    }

}

    <attr name="marqueeview_text_speed" format="float" /><!--播放速度 也就是文字滚动速度-->
    <attr name="marqueeview_text_color" format="color|reference" /><!-- 文字颜色 -->
    <attr name="marqueeview_text_size" format="float" /><!-- 文字大小 -->

    <attr name="marqueeview_is_resetLocation" format="boolean" /><!--重新改变内容的时候 ， 是否初始化 位置，默认为true，改变-->


    <attr name="marqueeview_text_shadow" format="boolean" /> <!---是否设置阴影-->
    <attr name="marqueeview_text_shadow_radius" format="float" /> <!---是否设置阴影-->
    <attr name="marqueeview_text_shadow_dx" format="float" /> <!---是否设置阴影-->
    <attr name="marqueeview_text_shadow_dy" format="float" /> <!---是否设置阴影-->
    <attr name="marqueeview_text_shadow_color" format="color" /> <!---是否设置阴影-->

</declare-styleable>