Android - 任何 Activity 的 Root View 层次结构中存在的所有 View 的相对路径生成器

Question

背景

在 android 布局文件中有很多 UI 元素和 View 组。有时我们不需要为 View 提供 id 值(唯一标识符)。在这种情况下，我们无法通过调用 findViewByid() 找到 View 。因此我们无法操纵它们。

问题是

我们如何为任何 Activity 的所有 View 生成路径，示例如下:

content>LinearLayout-0>RelativeLayout-3>LinearLayout-0>TextView-2

上面一行的意思是

1. 内容是主要布局
2. LinearLayout 是最顶层的布局
3. RelativeLayout-3 是最顶层布局的第三个 child
4. LinearLayout 是第三个 RelativeLayout 的 child
5. TexView-2 是 LinearLayout 的子级，而 LinearLayout 是最顶层 LinearLayout 的第三个 RelativeLayout 子级。

所以基本上我正在寻找如下功能:

String path = getViewPath(view);

和

View view = findViewByPath(path)

用例:

实际上服务器会通过指定 View 路径向移动应用程序广播一些命令，

然后移动应用程序将从路径中找到 View 并更改 View 的属性

Answer 1

在上述问题的解决方案下方，我创建了获取 View 路径和按路径获取 View 的方法。

干杯!!!

    package com.test;

import android.app.Activity;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.Window;

import java.util.Arrays;


public class CustomViewIdManager {


  private static final String ACTIVITY_CLASS_SEPARATOR = "@";
  private static final String VIEW_SEPARATOR = ">";
  private static final String VIEW_POSITION_SEPARATOR = ":";
  private static final String MAIN_CONTENT_LAYOUT_NAME = "content";


  /**
   * Find given view path in activity hierarchy
   *
   * @param view
   * @param activity
   * @return Path given view
   */
  public static String generateViewPathInActivityViewHierarchy(View view, Activity activity) {

    String path = "";
    View currentView = view;
    ViewParent currentParent;

    do {
      currentParent = currentView.getParent();
      if (currentView.getId() == Window.ID_ANDROID_CONTENT) {
        path = activity.getLocalClassName() + ACTIVITY_CLASS_SEPARATOR + MAIN_CONTENT_LAYOUT_NAME + path;
        break;
      } else {
        path = VIEW_SEPARATOR + currentView.getClass().getSimpleName() + VIEW_POSITION_SEPARATOR + getSelfIndexInParent((View) currentParent, currentView) + path;
      }
      currentView = (View) currentView.getParent();
    } while (true);

    return path;
  }


  /**
   * Finding the view by given path in activity view hierarchy
   * @param path
   * @param activity
   * @return
     */
  public static View findViewByCustomPath(String path, Activity activity) {

    String[] activitySplitting = path.split(ACTIVITY_CLASS_SEPARATOR);
    String[] viewSplitting = activitySplitting[1].split(VIEW_SEPARATOR);

    View viewLooker = null;

    if (viewSplitting[0].equalsIgnoreCase(MAIN_CONTENT_LAYOUT_NAME)) {
      viewLooker = ViewUtil.getContentView(activity);
    }

    return viewFinder(viewLooker, Arrays.copyOfRange(viewSplitting, 1, viewSplitting.length));

  }

  public static View viewFinder(View view, String[] restPath) {

    View viewToSendBack;

    String singleView = restPath[0];
    String[] viewPositioningSplitting = singleView.split(VIEW_POSITION_SEPARATOR);
    viewToSendBack = ((ViewGroup) view).getChildAt(Integer.parseInt(viewPositioningSplitting[1]));

    if (restPath.length > 1) {
      return viewFinder(viewToSendBack, Arrays.copyOfRange(restPath, 1, restPath.length));
    } else {
      return viewToSendBack;
    }
  }


  /**
   * This will calculate the self position inside view
   *
   * @param parent
   * @param view
   * @return index of child
   */
  public static int getSelfIndexInParent(View parent, View view) {

    int index = -1;
    if (parent instanceof ViewGroup) {
      ViewGroup viewParent = (ViewGroup) parent;

      for (int i = 0; i < viewParent.getChildCount(); ++i) {
        View child = viewParent.getChildAt(i);
        ++index;

        if (child == view) {
          return index;
        }
      }
    }

    return index;
  }
}