Android编程实现的简易路径导航条功能示例

public class PathTextView extends LinearLayout {  private TextView mTextView;  private HorizontalScrollView hsView;  private OnItemClickListener mListener;  //保存每一个路径的id和名称  private LinkedList<PathItem> pathItemList;  //可点击部门文本颜色  private static final int TEXT_COLOR = Color.parseColor("#48a0c7");  //分隔符  private static final String DIV_STR = " - ";  public PathTextView(Context context) {    super(context);  }  public PathTextView(Context context, AttributeSet attrs) {    super(context, attrs);    View root = LayoutInflater.from(context).inflate(R.layout.simple_tv, this, true);    hsView = (HorizontalScrollView) root.findViewById(R.id.path_hs);    mTextView = (TextView) root.findViewById(R.id.path_tv);    mTextView.setMovementMethod(LinkMovementMethod.getInstance());    mTextView.setOnLongClickListener(new View.OnLongClickListener() {      @Override      public boolean onLongClick(View v) {        return true;      }    });    pathItemList = new LinkedList<>();  }    public void initRoot(String text) {    mTextView.append(createSpannableString(-1, text));    pathItemList.addLast(new PathItem(-1, text));  }    public void append(long id, String text) {    mTextView.append(DIV_STR);    mTextView.append(createSpannableString(id, text));    pathItemList.addLast(new PathItem(id, text));    //HorizontalScrollView滑动到最右边    hsView.postDelayed(new Runnable() {      @Override      public void run() {        hsView.fullScroll(HorizontalScrollView.FOCUS_RIGHT);      }    }, 100);  }    public void backParent() {    int lastItemLength = pathItemList.removeLast().text.length();    CharSequence oldCs = mTextView.getText();    mTextView.setText(oldCs.subSequence(0, oldCs.length() - lastItemLength - DIV_STR.length()));  }  private SpannableString createSpannableString(long id, String text) {    SpannableString spStr = new SpannableString(text);    ClickableSpan clickSpan = new MyClickableSpan(id);    spStr.setSpan(clickSpan, 0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);    spStr.setSpan(new ForegroundColorSpan(TEXT_COLOR), 0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);    return spStr;  }  private class MyClickableSpan extends ClickableSpan {    private long id;    MyClickableSpan(long id) {      super();      this.id = id;    }    @Override    public void onClick(View widget) {      //更新当前路径      int backCount = 0;      while (pathItemList.getLast().id != id) {        backParent();        backCount++;      }      //回调      if (mListener != null && backCount > 0) {        mListener.onClick(id, backCount);      }    }  }  private class PathItem {    private long id;    private String text;    private PathItem(long id, String text) {      this.id = id;      this.text = text;    }  }  public interface OnItemClickListener {        void onClick(long currentId, int backCount);  }    public void setOnItemClickListener(OnItemClickListener listener) {    this.mListener = listener;  }}