Android自定义View实现仿1号店垂直滚动广告条代码

private Paint mPaint;private float x, startY, endY, firstY, nextStartY, secondY;//整个View的宽高是以第一个为标准的，所以第二句话长度必须小于第一句话private String[] text = {"今日特卖：毛衣3.3折>>>", "公告：全场半价>>>"};private float textWidth, textHeight;//滚动速度private float speech = 0;private static final int CHANGE_SPEECH = 0x01;//是否已经在滚动private boolean isScroll = false;

//初始化画笔mPaint = new Paint();mPaint.setColor(Color.RED);mPaint.setTextSize(30);//测量文字的宽高，以第一句话为标准Rect rect = new Rect();mPaint.getTextBounds(text[0], 0, text[0].length(), rect);textWidth = rect.width();textHeight = rect.height();//文字开始的x,y坐标//由于文字是以基准线为基线的，文字底部会突出一点，所以向上收5pxx = getX() + getPaddingLeft();startY = getTop() + textHeight + getPaddingTop() - 5;//文字结束的x,y坐标endY = startY + textHeight + getPaddingBottom();//下一个文字滚动开始的y坐标//由于文字是以基准线为基线的，文字底部会突出一点，所以向上收5pxnextStartY = getTop() - 5;//记录开始的坐标firstY = startY;secondY = nextStartY;

@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { super.onMeasure(widthMeasureSpec, heightMeasureSpec); int width = measureWidth(widthMeasureSpec); int height = measureHeight(heightMeasureSpec); setMeasuredDimension(width, height);}private int measureHeight(int heightMeasureSpec) { int result = 0; int size = MeasureSpec.getSize(heightMeasureSpec); int mode = MeasureSpec.getMode(heightMeasureSpec); if (mode == MeasureSpec.EXACTLY) {  result = size; } else {  result = (int) (getPaddingTop() + getPaddingBottom() + textHeight);  if (mode == MeasureSpec.AT_MOST) {   result = Math.min(result, size);  } } return result;}private int measureWidth(int widthMeasureSpec) { int result = 0; int size = MeasureSpec.getSize(widthMeasureSpec); int mode = MeasureSpec.getMode(widthMeasureSpec); if (mode == MeasureSpec.EXACTLY) {  result = size; } else {  result = (int) (getPaddingLeft() + getPaddingRight() + textWidth);  if (mode == MeasureSpec.AT_MOST) {   result = Math.min(result, size);  } } return result;}

@Overrideprotected void onDraw(Canvas canvas) { super.onDraw(canvas); //启动滚动 if (!isScroll) {  mHandler.sendEmptyMessageDelayed(CHANGE_SPEECH, 2000);  isScroll = true; } canvas.drawText(text[0], x, startY, mPaint); canvas.drawText(text[1], x, nextStartY, mPaint); startY += speech; nextStartY += speech; //超出View的控件时 if (startY > endY || nextStartY > endY) {  if (startY > endY) {   //第一次滚动过后交换值   startY = secondY;   nextStartY = firstY;  } else if (nextStartY > endY) {   //第二次滚动过后交换值   startY = firstY;   nextStartY = secondY;  }  speech = 0;  isScroll = false; } invalidate();}private Handler mHandler = new Handler() { @Override public void handleMessage(Message msg) {  super.handleMessage(msg);  switch (msg.what) {   case CHANGE_SPEECH:    speech = 1f;    break;  } }};

public onTouchListener listener;public interface onTouchListener { void touchListener(String s);}public void setListener(onTouchListener listener) { this.listener = listener;}@Overridepublic boolean dispatchTouchEvent(MotionEvent event) { switch (event.getAction()) {  case MotionEvent.ACTION_DOWN:  case MotionEvent.ACTION_MOVE:   //点击事件   if (listener != null) {    if (startY >= firstY && nextStartY < firstY) {     listener.touchListener(text[0]);    } else if (nextStartY >= firstY && startY < firstY) {     listener.touchListener(text[1]);    }   }   break; } return true;}

public class VerTextViewActivity extends AppCompatActivity { @Override protected void onCreate(Bundle savedInstanceState) {  super.onCreate(savedInstanceState);  setContentView(R.layout.activity_ver_text_view);  VerTextView tv_ver = (VerTextView) findViewById(R.id.tv_ver);  tv_ver.setListener(new VerTextView.onTouchListener() {   @Override   public void touchListener(String s) {    Toast.makeText(VerTextViewActivity.this, s, Toast.LENGTH_LONG).show();   }  }); }}

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal"> <ImageView  android:layout_width="120dp"  android:layout_height="30dp"  android:background="@drawable/vertextview" /> <com.handsome.app3.Custom.VerTextView.VerTextView  android:id="@+id/tv_ver"  android:layout_width="wrap_content"  android:layout_height="wrap_content"  android:background="#ffffff"  android:padding="8dp" /></LinearLayout>

/** * =====作者===== * 许英俊 * =====时间===== * 2016/10/11. */public class VerTextView extends View { private Paint mPaint; private float x, startY, endY, firstY, nextStartY, secondY; //整个View的宽高是以第一个为标准的，所以第二句话长度必须小于第一句话 private String[] text = {"今日特卖：毛衣3.3折>>>", "公告：全场半价>>>"}; private float textWidth, textHeight; //滚动速度 private float speech = 0; private static final int CHANGE_SPEECH = 0x01; //是否已经在滚动 private boolean isScroll = false; private Handler mHandler = new Handler() {  @Override  public void handleMessage(Message msg) {   super.handleMessage(msg);   switch (msg.what) {    case CHANGE_SPEECH:     speech = 1f;     break;   }  } }; public VerTextView(Context context, AttributeSet attrs) {  super(context, attrs);  //初始化画笔  mPaint = new Paint();  mPaint.setColor(Color.RED);  mPaint.setTextSize(30);  //测量文字的宽高，以第一句话为标准  Rect rect = new Rect();  mPaint.getTextBounds(text[0], 0, text[0].length(), rect);  textWidth = rect.width();  textHeight = rect.height();  //文字开始的x,y坐标  //由于文字是以基准线为基线的，文字底部会突出一点，所以向上收5px  x = getX() + getPaddingLeft();  startY = getTop() + textHeight + getPaddingTop() - 5;  //文字结束的x,y坐标  endY = startY + textHeight + getPaddingBottom();  //下一个文字滚动开始的y坐标  //由于文字是以基准线为基线的，文字底部会突出一点，所以向上收5px  nextStartY = getTop() - 5;  //记录开始的坐标  firstY = startY;  secondY = nextStartY; } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {  super.onMeasure(widthMeasureSpec, heightMeasureSpec);  int width = measureWidth(widthMeasureSpec);  int height = measureHeight(heightMeasureSpec);  setMeasuredDimension(width, height); } private int measureHeight(int heightMeasureSpec) {  int result = 0;  int size = MeasureSpec.getSize(heightMeasureSpec);  int mode = MeasureSpec.getMode(heightMeasureSpec);  if (mode == MeasureSpec.EXACTLY) {   result = size;  } else {   result = (int) (getPaddingTop() + getPaddingBottom() + textHeight);   if (mode == MeasureSpec.AT_MOST) {    result = Math.min(result, size);   }  }  return result; } private int measureWidth(int widthMeasureSpec) {  int result = 0;  int size = MeasureSpec.getSize(widthMeasureSpec);  int mode = MeasureSpec.getMode(widthMeasureSpec);  if (mode == MeasureSpec.EXACTLY) {   result = size;  } else {   result = (int) (getPaddingLeft() + getPaddingRight() + textWidth);   if (mode == MeasureSpec.AT_MOST) {    result = Math.min(result, size);   }  }  return result; } @Override protected void onDraw(Canvas canvas) {  super.onDraw(canvas);  //启动滚动  if (!isScroll) {   mHandler.sendEmptyMessageDelayed(CHANGE_SPEECH, 2000);   isScroll = true;  }  canvas.drawText(text[0], x, startY, mPaint);  canvas.drawText(text[1], x, nextStartY, mPaint);  startY += speech;  nextStartY += speech;  //超出View的控件时  if (startY > endY || nextStartY > endY) {   if (startY > endY) {    //第一次滚动过后交换值    startY = secondY;    nextStartY = firstY;   } else if (nextStartY > endY) {    //第二次滚动过后交换值    startY = firstY;    nextStartY = secondY;   }   speech = 0;   isScroll = false;  }  invalidate(); } public onTouchListener listener; public interface onTouchListener {  void touchListener(String s); } public void setListener(onTouchListener listener) {  this.listener = listener; } @Override public boolean dispatchTouchEvent(MotionEvent event) {  switch (event.getAction()) {   case MotionEvent.ACTION_DOWN:   case MotionEvent.ACTION_MOVE:    //点击事件    if (listener != null) {     if (startY >= firstY && nextStartY < firstY) {      listener.touchListener(text[0]);     } else if (nextStartY >= firstY && startY < firstY) {      listener.touchListener(text[1]);     }    }    break;  }  return true; }}