android之文字滚动栏

package cn.com.chenzheng_java; import android.content.Context; import android.graphics.Color; import android.text.TextPaint; import android.util.AttributeSet; import android.view.Gravity; import android.view.View; import android.view.ViewGroup; import android.view.animation.AccelerateDecelerateInterpolator; import android.widget.AbsListView; import android.widget.Scroller; import android.widget.TextView; /*** * 可滑动的文本 * @author 陈正 * @version 2.0 * @since 2011/12/16 */ public class MyTextViewGroup extends ViewGroup implements View.OnClickListener { private int totalCount = 0;// the total count of the data array private int width_showArea = 0;// the width of visible area private int width_perText = 0;// the width of per text,if text's length is too long,it will scroll private int height_perText = 30;// the default height of per text private int visible_number = 0;// the number of text within scan private String sources[];//the array to store infos private Context context; int middle = 0;// the number of visible_number/2-1,it's useful for our compute private int default_normal_textColor = Color.BLACK;// the default text color of unchecked private int default_selected_textColor = Color.WHITE;//the default text color of checked private int max_scroll_width = 0;//the max scroll width private StringBuilder stringBuilder = new StringBuilder(); private MyTypeClickListener myTypeClickListener = null;// custom listener of click event private Scroller scroller; private int fontSize = 20; private boolean isSelectChanged = true; private int max_index = 0;//the max number of index public MyTextViewGroup(Context context) { super(context); this.context = context; this.setBackgroundColor(Color.RED); } /*** * constrcutor * @param context * @param attributeSet */ public MyTextViewGroup(Context context, AttributeSet attributeSet) { super(context); this.context = context; } /** * 设置属性，并显示组件，任何对于组件的设置操作，应该都在setData之前被调用 * @param sources * 文本数组 * @param width_showArea * 展示区域的宽度 * @param visible_number * 展示区域展示的个数 * @param height_perText * 每一个文本的高度 */ public void setData(String[] sources, int width_showArea, int visible_number, int height_perText) { this.sources = sources; this.width_showArea = width_showArea; this.visible_number = visible_number; this.width_perText = width_showArea / visible_number; this.height_perText = height_perText; this.totalCount = this.sources.length; max_index = totalCount-1; init(); } /*** * init something */ private void init() { removeAllViewsInLayout(); scroller = new Scroller(context, new AccelerateDecelerateInterpolator()); for (int index = 0; index < totalCount; index++) { makeAndAddView(index, null); } max_scroll_width = (totalCount - visible_number) * width_perText; middle = visible_number/2; } private int temp__center_index = 0;//中心位置的那个元素的索引 private int temp_scroll_width = 0;//相对于中心位置来说，其滚动的距离，往左为负数 /*** * 将索引位置移动到视野的中心位置 * @param index */ public void showAtIndex(int index){ index = validateIndex(index); switch (getScrollModel(index)) { case ScrollMode.MODE_FIRST: gotoScroll(index); scrollFirst(index); break; case ScrollMode.MODE_END: gotoScroll(index); scrollEnd(index); break; default: gotoScroll(index); scrollNormal(index); break; } changeColor(index); invalidate(); } /*** * next */ public void next(){ isSelectChanged = false; showAtIndex(temp__center_index+1); } /** * previous */ public void previous(){ isSelectChanged = false; showAtIndex(temp__center_index-1); } /** * 处理移动到首页时的操作 * @param index (index<middle) */ private void scrollFirst(int index){ temp__center_index = middle; } /** * 处理移动到末页时的操作 * @param index （index>(max_index-middle)） */ private void scrollEnd(int index){ temp__center_index = max_index-middle; } /** * * @param index */ private void scrollNormal(int index){ temp__center_index = index; } /*** * 根据index和当前默认位置，前后滑动 * @param index */ private void gotoScroll(int index){ // forward if(index>temp__center_index){ next_step(index-temp__center_index); } else{ previous_step(temp__center_index-index); } } // 处理越界的情况 private int validateIndex(int index){ if (index >= (totalCount - 1)) index = totalCount - 1; if (index < 0) index = 0; return index; } /** * forward with the step * @param step */ private void next_step(int step){ if(!scroller.isFinished()){ scroller.abortAnimation(); } if(max_scroll_width<=(getScrollX()+step*width_perText)){ //scrollTo(max_scroll_width, 0); scroller.startScroll(getScrollX(), 0, max_scroll_width-getScrollX(), 0); }else{ scroller.startScroll(getScrollX(), 0, width_perText*step, 0); //scrollBy(width_perText*step, 0); } } /*** * scroll back * @param step */ private void previous_step(int step) { if(!scroller.isFinished()){ scroller.abortAnimation(); } if (getScrollX()-step*width_perText <= 0) { scrollTo(0, 0); } else { scroller.startScroll(getScrollX(), 0, -step*width_perText, 0); // scrollBy(-step*width_perText, 0); } } @Override public void computeScroll() { if (scroller.computeScrollOffset()) { //Log.e("computeScroll", "-滚动完毕-"); scrollTo(scroller.getCurrX(), 0); postInvalidate(); } // Log.e("computeScroll", "-滚动中-"); } /*** * 改变指定索引的内容为高亮显示 * * @param index * start from 0 */ private void changeColor(int index){ if(!isSelectChanged) return ; if (index < 0 || index > (totalCount - 1)) return; TextView textView; MyScrollText myScrollText; for (int i = 0; i < getChildCount(); i++) { if(i==index){ if (stringBuilder.toString().indexOf("-" + index + "-") == -1) { textView = (TextView) getChildAt(index); textView.setTextColor(default_selected_textColor); } else { myScrollText = (MyScrollText) getChildAt(index); myScrollText.getPaint().setColor(default_selected_textColor); } }else{ if (stringBuilder.toString().indexOf("-" + i + "-") == -1) { textView = (TextView) getChildAt(i); textView.setTextColor(default_normal_textColor); } else { myScrollText = (MyScrollText) getChildAt(i); myScrollText.getPaint().setColor(default_normal_textColor); } } } } @Override protected void onScrollChanged(int l, int t, int oldl, int oldt) { //Log.e("onScrollChanged", "--------"); super.onScrollChanged(l, t, oldl, oldt); } @Override protected void onLayout(boolean changed, int left, int top, int right, int bottom) { int childLeft = 0; final int count = getChildCount(); for (int i = 0; i < count; i++) { final View child = getChildAt(i); if (child.getVisibility() != View.GONE) { final int childWidth = width_perText; child.layout(childLeft, 0, childLeft + childWidth, height_perText); childLeft += childWidth; } } } /*** * 创建并且添加一个布局到viewFlow中 * * @param position * dapter中的索引 * @param addToEnd * 是否添加到父容器的最后 * @param convertView * 布局View * @return */ private View makeAndAddView(int position, View convertView) { View view = createMyScrollText(position); 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