【View】FlowLayout

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于 2023-04-22 15:34:27 发布 · 506 阅读

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#android #java

文章介绍了如何在Android中使用FlowLayout，这是一个将子视图水平布局直到一行填满然后换行的组件。源码来自GoogleMaterialDesign库，但需要单独复制使用。它提供了设置子视图间距和行间距的功能，并支持单行或多行布局模式。

FlowLayout 使用场景

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官方的 FlowLayout

位于 com.google.android.material.internal 包下的 FlowLayout 无法直接使用。需要单独复制一份代码出来。

//设置item距离
app:itemSpacing="8dp"
//设置行间距
app:lineSpacing="8dp"

源码

基于 implementation 'com.google.android.material:material:1.7.0'

/*
 * Copyright 2018 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.block.androidui.widget;

import static androidx.annotation.RestrictTo.Scope.LIBRARY_GROUP;

import android.annotation.TargetApi;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.annotation.RestrictTo;
import androidx.core.view.MarginLayoutParamsCompat;
import androidx.core.view.ViewCompat;

import com.google.android.material.R;

/**
 * Horizontally lay out children until the row is filled and then moved to the next line. Call
 * {@link FlowLayout#setSingleLine(boolean)} to disable reflow and lay all children out in one line.
 *
 * @hide
 */
public class FlowLayout extends ViewGroup {
   
   
  private int lineSpacing;
  private int itemSpacing;
  private boolean singleLine;
  private int rowCount;

  public FlowLayout(@NonNull Context context) {
   
   
    this(context, null);
  }

  public FlowLayout(@NonNull Context context, @Nullable AttributeSet attrs) {
   
   
    this(context, attrs, 0);
  }

  public FlowLayout(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
   
   
    super(context, attrs, defStyleAttr);
    singleLine = false;
    loadFromAttributes(context, attrs)