android 实现文字自动滚动的走马灯效果。

红色为关键代码。

1，textview设置：

  <TextView
            android:id="@+id/tvAutoScroll"
            android:layout_width="50dp"
            android:layout_height="wrap_content"
            android:text="1222222222222222222233333333335566" 
            android:singleLine="true"
            android:scrollHorizontally="true"
            android:ellipsize="marquee"
            android:marqueeRepeatLimit="marquee_forever"
            android:layout_alignParentTop="true"
           
            />

2，代码中触发滚动：

tvAutoScroll = (TextView) findViewById(R.id.tvAutoScroll); 

tvAutoScroll.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
tvAutoScroll.setSelected(true);

}
});

二，一个简单的TabGroup控件，效果类似微信底部的tab。

package com.commonlib.ui;import java.util.List;import java.util.Locale;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Paint.Style;import android.os.Parcel;import android.os.Parcelable;import android.util.AttributeSet;import android.util.DisplayMetrics;import android.util.TypedValue;import android.view.Gravity;import android.view.View;import android.view.ViewTreeObserver.OnGlobalLayoutListener;import android.widget.HorizontalScrollView;import android.widget.LinearLayout;public class TabGroup extends HorizontalScrollView {private LinearLayout.LayoutParams defaultTabLayoutParams;private LinearLayout.LayoutParams expandedTabLayoutParams;private LinearLayout tabsContainer;private int tabCount;private int currentPosition = -1;private float currentPositionOffset = 0f;private boolean shouldExpand = true;private int scrollOffset = 52;private int lastScrollX = 0;private Locale locale;private Paint rectPaint;public TabGroup(Context context) {this(context, null);}public TabGroup(Context context, AttributeSet attrs) {this(context, attrs, 0);}public TabGroup(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);rectPaint = new Paint();rectPaint.setAntiAlias(true);rectPaint.setStyle(Style.FILL);setFillViewport(true);setWillNotDraw(false);tabsContainer = new LinearLayout(context);tabsContainer.setOrientation(LinearLayout.HORIZONTAL);tabsContainer.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));addView(tabsContainer);DisplayMetrics dm = getResources().getDisplayMetrics();/** * convert dip to pix.default. */scrollOffset = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, scrollOffset, dm);defaultTabLayoutParams = new LinearLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.MATCH_PARENT);defaultTabLayoutParams.gravity = Gravity.CENTER_VERTICAL;//expandedTabLayoutParams = new LinearLayout.LayoutParams(0,LayoutParams.MATCH_PARENT, 1.0f);expandedTabLayoutParams.gravity = Gravity.CENTER_VERTICAL;if (locale == null) {locale = getResources().getConfiguration().locale;}}public static interface OnTabItemClickListener {void OnTabItemClick(int index);}private OnTabItemClickListener mOnTabItemClickListener;private int indicatorColor = Color.BLACK;private int indicatorHeight = 10;private boolean isShowIndicator = false;private int underlineHeight = 5;public int getUnderlineHeight() {return underlineHeight;}public void setUnderlineHeight(int underlineHeight) {this.underlineHeight = underlineHeight;invalidate();}public int getIndicatorColor() {return indicatorColor;}public void setIndicatorColor(int indicatorColor) {this.indicatorColor = indicatorColor;invalidate();}public int getIndicatorHeight() {return indicatorHeight;}public void setIndicatorHeight(int indicatorHeight) {this.indicatorHeight = indicatorHeight;invalidate();}public boolean isShowIndicator() {return isShowIndicator;}public void setShowIndicator(boolean isShowIndicator) {this.isShowIndicator = isShowIndicator;invalidate();}public void setOnItemClickListener(OnTabItemClickListener pOnTabItemClickListener) {mOnTabItemClickListener = pOnTabItemClickListener;}/** * note:all property set must call before this method.other wise,your * property set will not be effect. *  * @param tabItems */public void setTabItems(List<TabItem> tabItems) {if (tabItems == null || tabItems.isEmpty()) {throw new IllegalArgumentException("tab items cannot be empty!!");}tabsContainer.removeAllViews();tabCount = tabItems.size();for (int i = 0; i < tabCount; i++) {final TabItem item = tabItems.get(i);final int j = i;item.view().setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View v) {if (mOnTabItemClickListener != null) {mOnTabItemClickListener.OnTabItemClick(j);}}});addTab(i, item.view());}getViewTreeObserver().addOnGlobalLayoutListener(new OnGlobalLayoutListener() {@Overridepublic void onGlobalLayout() {getViewTreeObserver().removeGlobalOnLayoutListener(this);scrollToChild(currentPosition, 0);}});}private void unSelectItem(int index) {TabItem item = (TabItem) tabsContainer.getChildAt(index);item.unselect();}public void selectItem(int index) {int childcounts = tabsContainer.getChildCount();if (index < 0 || index >= childcounts) {return;}// must unselect all first.for (int i = 0; i < childcounts; i++) {unSelectItem(i);}TabItem item = (TabItem) tabsContainer.getChildAt(index);item.select();//currentPosition = index;scrollToChild(currentPosition,(int) (currentPositionOffset * tabsContainer.getChildAt(currentPosition).getWidth()));invalidate();}private void addTab(final int position, View tab) {tab.setFocusable(true);tabsContainer.addView(tab, position, shouldExpand ? expandedTabLayoutParams: defaultTabLayoutParams);}private void scrollToChild(int position, int offset) {if (tabCount == 0) {return;}int newScrollX = tabsContainer.getChildAt(position).getLeft() + offset;if (position > 0 || offset > 0) {newScrollX -= scrollOffset;}if (newScrollX != lastScrollX) {lastScrollX = newScrollX;scrollTo(newScrollX, 0);}}public void setScrollOffset(int scrollOffsetPx) {this.scrollOffset = scrollOffsetPx;}public void setShouldExpand(boolean shouldExpand) {this.shouldExpand = shouldExpand;}@Overridepublic void onRestoreInstanceState(Parcelable state) {SavedState savedState = (SavedState) state;super.onRestoreInstanceState(savedState.getSuperState());currentPosition = savedState.currentPosition;requestLayout();}@Overridepublic Parcelable onSaveInstanceState() {Parcelable superState = super.onSaveInstanceState();SavedState savedState = new SavedState(superState);savedState.currentPosition = currentPosition;return savedState;}static class SavedState extends BaseSavedState {int currentPosition;public SavedState(Parcelable superState) {super(superState);}private SavedState(Parcel in) {super(in);currentPosition = in.readInt();}@Overridepublic void writeToParcel(Parcel dest, int flags) {super.writeToParcel(dest, flags);dest.writeInt(currentPosition);}public static final Creator<SavedState> CREATOR = new Creator<SavedState>() {@Overridepublic SavedState createFromParcel(Parcel in) {return new SavedState(in);}@Overridepublic SavedState[] newArray(int size) {return new SavedState[size];}};}@Overrideprotected void onDraw(Canvas canvas) {// TODO Auto-generated method stubsuper.onDraw(canvas);if (!isShowIndicator) {return;}final int height = getHeight();// draw underlinerectPaint.setColor(indicatorColor);canvas.drawRect(0, height - underlineHeight, tabsContainer.getWidth(),height, rectPaint);// draw indicator linerectPaint.setColor(indicatorColor);// default: line below current tabView currentTab = tabsContainer.getChildAt(currentPosition);float lineLeft = currentTab.getLeft();float lineRight = currentTab.getRight();// if there is an offset, start interpolating left and right coordinates// between current and next tabif (currentPositionOffset > 0f && currentPosition < tabCount - 1) {View nextTab = tabsContainer.getChildAt(currentPosition + 1);final float nextTabLeft = nextTab.getLeft();final float nextTabRight = nextTab.getRight();lineLeft = (currentPositionOffset * nextTabLeft + (1f - currentPositionOffset)* lineLeft);lineRight = (currentPositionOffset * nextTabRight + (1f - currentPositionOffset)* lineRight);}canvas.drawRect(lineLeft, height - indicatorHeight, lineRight, height,rectPaint);}/** * this just use for viewpager. *  * @param position * @param positionOffset * @param positionOffsetPixels */public void onPageScrolled(int position, float positionOffset,int positionOffsetPixels) {currentPosition = position;currentPositionOffset = positionOffset;scrollToChild(position, (int) (positionOffset * tabsContainer.getChildAt(position).getWidth()));invalidate();}/** * this just use for viewpager. *  * @param state */public void onPageScrollStateChanged(int state) {final int SCROLL_STATE_IDLE = 0;if (state == SCROLL_STATE_IDLE) {scrollToChild(currentPosition, 0);}}}

package com.commonlib.ui;import android.view.View;public interface TabItem {void select();void unselect();View view();}

使用示例：

tabs = (TabGroup) findViewById(R.id.main_tab_bottombar);
tabs.setOnItemClickListener(this);
List<TabItem> tabitems = new ArrayList<TabItem>();


TabItem tabIndex = new TabItemView(this, "index",
R.drawable.ic_launcher, Color.BLACK, Color.BLUE,
R.drawable.ic_launcher);
//
TabItem tabCat = new TabItemView(this, "category",
R.drawable.ic_launcher, Color.BLACK, Color.BLUE,
R.drawable.ic_launcher);
//
TabItem tabUser = new TabItemView(this, "user", R.drawable.ic_launcher,
Color.BLACK, Color.BLUE, R.drawable.ic_launcher);
//
TabItem tabSetting = new TabItemView(this, "setting",
R.drawable.ic_launcher, Color.BLACK, Color.BLUE,
R.drawable.ic_launcher);
//


tabitems.add(tabIndex);
tabitems.add(tabCat);
tabitems.add(tabUser);
tabitems.add(tabSetting);
tabs.setTabItems(tabitems);