Android自定义跑马灯文字效果
本文实例为大家分享了Android自定义跑马灯文字的具体代码,供大家参考,具体内容如下
Android 跑马灯效果文字:
效果图(真实动画很流畅,这个转gif有问题,感觉有点卡):
代码:
/** * Created by wuguangliang on 2018/12/21 * * 跑马灯效果文字 */ public class MarqueeHorizontalTextView extends AppCompatTextView { private float textLength = 0f; private float drawTextX = 0f;// 文本的横坐标 public boolean isStarting = false;// 是否开始滚动 private Paint paint = null; private String text = ""; private long waitTime = 1000; //开始时等待的时间 private int scrollTile = 2; //文字的滚动速度 private int baseline; public MarqueeHorizontalTextView(Context context) { super(context); initView(context); } public MarqueeHorizontalTextView(Context context, AttributeSet attrs) { super(context, attrs); initView(context); } public MarqueeHorizontalTextView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); initView(context); } private void initView(Context context) { setMaxWidth(context.getResources().getDisplayMetrics().widthPixels / 2); //因为需求需要所以设置了最大宽度,如果不需要此功能可以删除掉 paint = getPaint(); paint.setColor(getTextColors().getColorForState(getDrawableState(), 0)); text = getText().toString(); if (TextUtils.isEmpty(text)) { return; } textLength = paint.measureText(text); isStarting = true; } @Override public void setTextColor(int color) { super.setTextColor(color); paint.setColor(color); start(); } @Override public void setText(CharSequence text, BufferType type) { super.setText(text, type); this.text = text.toString(); this.textLength = getPaint().measureText(text.toString()); drawTextX = 0; start(); } public void start() { isStarting = true; invalidate(); } public void stop() { isStarting = false; invalidate(); } @Override public void onDraw(Canvas canvas) { final Paint.FontMetricsInt fontMetrics = paint.getFontMetricsInt(); baseline = (canvas.getHeight() - fontMetrics.bottom - fontMetrics.top) / 2; if (textLength <= canvas.getWidth()) { canvas.drawText(text, 0, baseline, paint); return; } canvas.drawText(text, -drawTextX, baseline, paint); if (!isStarting) { return; } if (drawTextX == 0) { postDelayed(() -> { drawTextX = 1; isStarting = true; invalidate(); }, waitTime); isStarting = false; return; } drawTextX += scrollTile; //判断是否滚动结束 if (drawTextX > textLength) { drawTextX = -canvas.getWidth(); } invalidate(); } }
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持海外IDC网。
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