可以自由拖拽的水平滚动的文字，按下后暂停两秒钟继续滚动
package com.ds.uilib.scrollview;
/**
* Created by dapeng on 2017/6/14.
*/
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Paint.FontMetrics;
import android.graphics.PixelFormat;
import android.graphics.PorterDuff;
import android.graphics.PorterDuff.Mode;
import android.graphics.PorterDuffXfermode;
import android.os.Handler;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import androidx.annotation.NonNull;
import com.ds.uilib.R;
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class CustomScrollBar extends SurfaceView implements
SurfaceHolder.Callback {
private final String TAG = "CustomScrollBar";
private SurfaceHolder holder;
private Paint paint = null;// 画笔
private boolean bStop = false; // 停止滚动
private boolean clickEnable = false; // 可以点击
private boolean isHorizontal = true; // 水平｜垂直
private int speed = 1; // 滚动速度
private String text = "";// 文本内容
private float textSize = 15f; // 字号
private int textColor = Color.BLACK; // 文字颜色
private int times = Integer.MAX_VALUE; // 滚动次数
private int viewWidth = 0;// 控件的长度
private int viewHeight = 0; // 控件的高度
private float textWidth = 0f;// 水平滚动时的文本长度
private float textHeight = 0f; // 垂直滚动时的文本高度
private float textX = 0f;// 文字的横坐标
private float textY = 0f;// 文字的纵坐标
private float viewWidth_plus_textLength = 0.0f;// 显示总长度
private int time = 0; // 已滚动次数
private ScheduledExecutorService scheduledExecutorService; // 执行滚动线程
private boolean isMoveLeft;
private boolean isUp;
private float moveX;
private float upX;
private float textXDown;
private float downX;
private float donwTextX;
Handler handler = new Handler(){
@Override
public void handleMessage(@NonNull Message msg) {
super.handleMessage(msg);
bStop=false;
}
};
public CustomScrollBar(Context context) {
super(context);
}
public CustomScrollBar(Context context, AttributeSet attrs) {
//---------1
super(context, attrs);
holder = this.getHolder();
holder.addCallback(this);
paint = new Paint();
//获取布局文件中的值
TypedArray arr = getContext().obtainStyledAttributes(attrs,
R.styleable.CustomScrollBar);
clickEnable = arr.getBoolean(R.styleable.CustomScrollBar_clickEnable,
clickEnable);
isHorizontal = arr.getBoolean(R.styleable.CustomScrollBar_isHorizontal,
isHorizontal);
speed = arr.getInteger(R.styleable.CustomScrollBar_speed, speed);
text = arr.getString(R.styleable.CustomScrollBar_text3);
textColor = arr.getColor(R.styleable.CustomScrollBar_textColor3, textColor);
textSize = arr.getDimension(R.styleable.CustomScrollBar_textSize3, textSize);
times = arr.getInteger(R.styleable.CustomScrollBar_times, times);
time = times;
paint.setColor(textColor);
paint.setTextSize(textSize);
/*
* 下面两行代码配合draw()方法中的canvas.drawColor(Color.TRANSPARENT,Mode.CLEAR);
* 将画布填充为透明
*/
setZOrderOnTop(true);
getHolder().setFormat(PixelFormat.TRANSLUCENT);
setFocusable(true); // 设置焦点
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
//----------2
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
viewWidth = MeasureSpec.getSize(widthMeasureSpec);//得到控件的宽度
viewHeight = MeasureSpec.getSize(heightMeasureSpec);//得到控件的高度
if (isHorizontal) { // 水平滚动
textWidth = paint.measureText(text);// 获取text的长度
viewWidth_plus_textLength = viewWidth + textWidth;
textY = (viewHeight - getFontHeight(textSize)) / 2
+ getPaddingTop() - getPaddingBottom();
} else { // 垂直滚动
textHeight = getFontHeight(textSize) * text.length();// 获取text的长度
viewWidth_plus_textLength = viewHeight + textHeight;
textX = (viewWidth - textSize) / 2 + getPaddingLeft()
- getPaddingRight();
}
}
@Override
public void surfaceChanged(SurfaceHolder arg0, int arg1, int arg2, int arg3) {
//----------4
Log.d(TAG, "surfaceChanged: ");
}
@Override
public void surfaceCreated(SurfaceHolder holder) {
//-----------3
bStop = false;
scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
scheduledExecutorService.scheduleAtFixedRate(new ScrollThread(), 1000,
10, TimeUnit.MILLISECONDS);
Log.d(TAG, "surfaceCreated: ");
}
@Override
public void surfaceDestroyed(SurfaceHolder arg0) {
bStop = true;
scheduledExecutorService.shutdown();
Log.d(TAG, "surfaceDestroyed: ");
}
// 获取字体高度
private int getFontHeight(float fontSize) {
Paint paint = new Paint();
paint.setTextSize(fontSize);
FontMetrics fm = paint.getFontMetrics();
return (int) Math.ceil(fm.descent - fm.ascent);
}
private void setTimes(int times) {
if (times <= 0) {
this.times = Integer.MAX_VALUE;
} else {
this.times = times;
time = times;
}
}
public void setText(String text) {
this.text = text;
}
private void setSpeed(int speed) {
if (speed > 10 || speed < 0) {
throw new IllegalArgumentException("Speed was invalid integer, it must between 0 and 10");
} else {
this.speed = speed;
}
}
/**
* 当屏幕被触摸时调用
*/
@Override
public boolean onTouchEvent(MotionEvent event) {
if (!clickEnable) {
return true;
}
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
bStop = true;
// if (!bStop && time == 0) {
// time = times;
// }
downX = event.getX();
donwTextX =viewWidth- textX;
break;
case MotionEvent.ACTION_MOVE:
Canvas canvas = holder.lockCanvas();
canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);// 通过清屏把画布填充为透明
isMoveLeft = true;
moveX = event.getRawX();
canvas.drawText(text, moveX+viewWidth-textX-downX, textY, paint);
postInvalidate();
holder.unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
break;
case MotionEvent.ACTION_UP:
isUp = true;
upX=event.getRawX();
textX = donwTextX - downX+upX;
textX = viewWidth -textX;
if(textX<0){
textX=0;
}
isMoveLeft = false;
// bStop = false;
handler.sendEmptyMessageDelayed(0, 2000);
break;
}
return true;
}
private synchronized void draw(float X, float Y) {
Canvas canvas = holder.lockCanvas();//获取画布
canvas.drawColor(Color.TRANSPARENT, Mode.CLEAR);// 通过清屏把画布填充为透明
if (isHorizontal) { // 水平滚动
canvas.drawText(text, X, Y, paint);
}
// else { // 垂直滚动
// for (int i = 0; i < text.length(); i++) {
// canvas.drawText(text.charAt(i) + "", X, Y + (i + 1)
// * getFontHeight(textSize), paint);
// }
// }
holder.unlockCanvasAndPost(canvas);// 解锁画布，提交画好的图像
}
class ScrollThread implements Runnable {
@Override
public void run() {
while (!bStop) {
if (isHorizontal) {
draw(viewWidth - textX, textY);
Log.i("machao",textX+"");
textX += speed;// 速度设置：1-10
if (textX > viewWidth_plus_textLength) {
textX = 0;
--time;
}
//垂直不做处理
// else {
// draw(textX, viewHeight - textY);
// textY += speed;
// if (textY > viewWidth_plus_textLength) {
// textY = 0;
// --time;
// }
// }
if (time <= 0) {
// bStop = true;
}
}
}
}
}
}
属性文件中配置
<declare-styleable name="CustomScrollBar">
<attr name="clickEnable" format="boolean" />
<attr name="isHorizontal" format="boolean" />
<attr name="speed" format="integer" />
<attr name="text3" format="string" />
<attr name="textColor3" format="color" />
<attr name="textSize3" format="dimension" />
<attr name="times" format="integer" />
</declare-styleable>
代码中使用
<com.ds.uilib.scrollview.CustomScrollBar
android:id="@+id/customscrollBar"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_alignParentTop="true"
android:layout_marginTop="22dp"
app:clickEnable="true"
app:isHorizontal="true"
app:speed="2"
app:textColor3="@color/color666666"
app:textSize3="14sp"
app:times="3" />
参考文章https://blog.csdn.net/u012604745/article/details/73277245
