Android编程实现的简易路径导航条功能示例

PathTextView.Java

/**

 * 显示路径的View，支持返回上一级，支持点击某个位置回到指定层级。

 */

publicclassPathTextViewextendsLinearLayout {

  privateTextView mTextView;

  privateHorizontalScrollView hsView;

  privateOnItemClickListener mListener;

  //保存每一个路径的id和名称

  privateLinkedList pathItemList;

  //可点击部门文本颜色

  privatestaticfinalintTEXT_COLOR = Color.parseColor("#48a0c7");

  //分隔符

  privatestaticfinalString DIV_STR =" - ";

  publicPathTextView(Context context) {

    super(context);

  }

  publicPathTextView(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(newView.OnLongClickListener() {

      @Override

      publicbooleanonLongClick(View v) {

        returntrue;

      }

    });

    pathItemList =newLinkedList<>();

  }

  /**

   * 初始化根路径名称。

   */

  publicvoidinitRoot(String text) {

    mTextView.append(createSpannableString(-1, text));

    pathItemList.addLast(newPathItem(-1, text));

  }

  /**

   * 继续拼接一个路径。

   */

  publicvoidappend(longid, String text) {

    mTextView.append(DIV_STR);

    mTextView.append(createSpannableString(id, text));

    pathItemList.addLast(newPathItem(id, text));

    //HorizontalScrollView滑动到最右边

    hsView.postDelayed(newRunnable() {

      @Override

      publicvoidrun() {

        hsView.fullScroll(HorizontalScrollView.FOCUS_RIGHT);

      }

    },100);

  }

  /**

   * 返回父级路径，一般用户点击“返回”时调用。

   */

  publicvoidbackParent() {

    intlastItemLength = pathItemList.removeLast().text.length();

    CharSequence oldCs = mTextView.getText();

    mTextView.setText(oldCs.subSequence(0, oldCs.length() - lastItemLength - DIV_STR.length()));

  }

  privateSpannableString createSpannableString(longid, String text) {

    SpannableString spStr =newSpannableString(text);

    ClickableSpan clickSpan =newMyClickableSpan(id);

    spStr.setSpan(clickSpan,0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);

    spStr.setSpan(newForegroundColorSpan(TEXT_COLOR),0, text.length(), Spanned.SPAN_INCLUSIVE_EXCLUSIVE);

    returnspStr;

  }

  privateclassMyClickableSpanextendsClickableSpan {

    privatelongid;

    MyClickableSpan(longid) {

      super();

      this.id = id;

    }

    @Override

    publicvoidonClick(View widget) {

      //更新当前路径

      intbackCount =0;

      while(pathItemList.getLast().id != id) {

        backParent();

        backCount++;

      }

      //回调

      if(mListener !=null&& backCount >0) {

        mListener.onClick(id, backCount);

      }

    }

  }

  privateclassPathItem {

    privatelongid;

    privateString text;

    privatePathItem(longid, String text) {

      this.id = id;

      this.text = text;

    }

  }

  publicinterfaceOnItemClickListener {

    /**

     * @param currentId 返回后目录的id.

     * @param backCount 返回层级的数量.

     */

    voidonClick(longcurrentId,intbackCount);

  }

  /**

   * 设置点击某个中间路径时的回调。

   */

  publicvoidsetOnItemClickListener(OnItemClickListener listener) {

    this.mListener = listener;

  }

}

simple_tv.xml

  android:id="@+id/path_hs"

  android:layout_width="match_parent"

  android:layout_height="wrap_content"

  android:background="@color/light_gray2"

  android:scrollbars="none">

    android:id="@+id/path_tv"

    android:layout_width="wrap_content"

    android:layout_height="wrap_content"

    android:background="@color/light_gray2"

    android:paddingBottom="12dp"

    android:paddingLeft="8dp"

    android:paddingRight="8dp"

    android:paddingTop="12dp"

    android:textSize="15sp"/>