[英]How can I do something like a FlowLayout in Android?
如何在 Android 中执行类似FlowLayout
的操作?
如果您观看我在 Devoxx 大学日所做的演讲(可在parleys.com 上找到),您将学会如何自己动手。 在演讲中,我在舞台上现场编写了FlowLayout
实现,以展示编写自定义布局是多么简单。
实现托管在这里。
您应该使用FlexboxLayout
与flexWrap="wrap"
属性。
<com.google.android.flexbox.FlexboxLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:flexWrap="wrap">
<!-- contents go here -->
</com.google.android.flexbox.FlexboxLayout>
有关构建说明,请参阅github 存储库。
implementation 'com.google.android:flexbox:2.0.1'
更多关于这个 - https://android-developers.googleblog.com/2017/02/build-flexible-layouts-with.html
我没有足够的声誉来对 Romain Guy 的答案发表评论,但这就是这个答案的所在(我创建了一个帐户只是为了分享我的编辑)。
无论如何,我看到其他人发现他非常酷的 FlowLayout 解决方案有一些问题。 我自己可以找到一个,我和其他人一样看到一些孩子被夹住了。 仔细查看算法,似乎是高度计算中的一个非常简单的错误。 当最后一个孩子被放在新行中时,则没有正确计算高度。 我清理了一些计算(“高度”与当前高度有一个奇怪的用法)。
以下更改修复了“如果在新行上,最后一个孩子被剪裁”的问题:
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec)
{
int widthLimit = MeasureSpec.getSize(widthMeasureSpec) - getPaddingRight();
int widthMode = MeasureSpec.getMode(widthMeasureSpec);
boolean growHeight = widthMode != MeasureSpec.UNSPECIFIED;
int width = 0;
int currentWidth = getPaddingLeft();
int currentHeight = getPaddingTop();
int maxChildHeight = 0;
boolean breakLine = false;
boolean newLine = false;
int spacing = 0;
final int count = getChildCount();
for (int i = 0; i < count; i++)
{
View child = getChildAt(i);
measureChild(child, widthMeasureSpec, heightMeasureSpec);
LayoutParams lp = (LayoutParams) child.getLayoutParams();
spacing = mHorizontalSpacing;
if (lp.horizontalSpacing >= 0)
{
spacing = lp.horizontalSpacing;
}
if (growHeight && (breakLine || ((currentWidth + child.getMeasuredWidth()) > widthLimit)))
{
newLine = true;
currentHeight += maxChildHeight + mVerticalSpacing;
width = Math.max(width, currentWidth - spacing);
currentWidth = getPaddingLeft();
maxChildHeight = 0;
}
else
{
newLine = false;
}
maxChildHeight = Math.max(maxChildHeight, child.getMeasuredHeight());
lp.x = currentWidth;
lp.y = currentHeight;
currentWidth += child.getMeasuredWidth() + spacing;
breakLine = lp.breakLine;
}
if (newLine == false)
{
width = Math.max(width, currentWidth - spacing);
}
width += getPaddingRight();
int height = currentHeight + maxChildHeight + getPaddingBottom();
setMeasuredDimension(resolveSize(width, widthMeasureSpec),
resolveSize(height, heightMeasureSpec));
}
谷歌有一个名为“flexbox-layout”的库。 你应该检查一下。
要在 RecyclerView 中使用它,您可以使用类似的东西:
val layoutManager = FlexboxLayoutManager(activity)
layoutManager.flexDirection = FlexDirection.ROW
layoutManager.flexWrap = FlexWrap.WRAP
layoutManager.justifyContent = JustifyContent.FLEX_START
layoutManager.alignItems = AlignItems.FLEX_START
recyclerView.layoutManager=layoutManager
这是自定义类,您可以在其中通过添加动态视图(也称为 FlowLayout)来实现如下布局。
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/*
Created By Dhavalkumar Solanki
* */
public class FlowLayout extends ViewGroup {
private int line_height_space;
public static class LayoutParams extends ViewGroup.LayoutParams {
public int horizontal_spacing;
public int vertical_spacing;
/**
* @param horizontal_spacing Pixels between items, horizontally
* @param vertical_spacing Pixels between items, vertically
*/
public LayoutParams(int horizontal_spacing, int vertical_spacing) {
super(0, 0);
this.horizontal_spacing = horizontal_spacing;
this.vertical_spacing = vertical_spacing;
}
}
public FlowLayout(Context context) {
super(context);
}
public FlowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
assert (MeasureSpec.getMode(widthMeasureSpec) != MeasureSpec.UNSPECIFIED);
final int width = MeasureSpec.getSize(widthMeasureSpec) - getPaddingLeft() - getPaddingRight();
int height = MeasureSpec.getSize(heightMeasureSpec) - getPaddingTop() - getPaddingBottom();
final int count = getChildCount();
int line_height_space = 0;
int xpos = getPaddingLeft();
int ypos = getPaddingTop();
int childHeightMeasureSpec;
if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, MeasureSpec.AT_MOST);
} else {
childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED);
}
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
child.measure(MeasureSpec.makeMeasureSpec(width, MeasureSpec.AT_MOST), childHeightMeasureSpec);
final int childw = child.getMeasuredWidth();
line_height_space = Math.max(line_height_space, child.getMeasuredHeight() + lp.vertical_spacing);
if (xpos + childw > width) {
xpos = getPaddingLeft();
ypos += line_height_space;
}
xpos += childw + lp.horizontal_spacing;
}
}
this.line_height_space = line_height_space;
if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.UNSPECIFIED) {
height = ypos + line_height_space;
} else if (MeasureSpec.getMode(heightMeasureSpec) == MeasureSpec.AT_MOST) {
if (ypos + line_height_space < height) {
height = ypos + line_height_space;
}
}
setMeasuredDimension(width, height);
}
@Override
protected ViewGroup.LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(1, 1); // default of 1px spacing
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
if (p instanceof LayoutParams) {
return true;
}
return false;
}
@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int count = getChildCount();
final int width = r - l;
int xpos = getPaddingLeft();
int ypos = getPaddingTop();
for (int i = 0; i < count; i++) {
final View child = getChildAt(i);
if (child.getVisibility() != GONE) {
final int childw = child.getMeasuredWidth();
final int childh = child.getMeasuredHeight();
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
if (xpos + childw > width) {
xpos = getPaddingLeft();
ypos += line_height_space;
}
child.layout(xpos, ypos, xpos + childw, ypos + childh);
xpos += childw + lp.horizontal_spacing;
}
}
}
}
例子 :
文本视图.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tool="http://schemas.android.com/tools"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:id="@+id/tvText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="19sp"
android:background="@drawable/unselected_tag"
android:textColor="@color/colorPrimary"
tool:text="Temp" />
</RelativeLayout>
activity_flow_layou_demo.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tvTitleBusiness"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Business Interest "
android:textColor="@color/colorPrimary"
android:textSize="25sp" />
<com.example.tristateandroid2.radardemo.FlowLayout
android:id="@+id/flowBusiness"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.tristateandroid2.radardemo.FlowLayout>
</LinearLayout>
<LinearLayout
android:layout_marginTop="@dimen/activity_horizontal_margin"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<TextView
android:id="@+id/tvTitlePrivate"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Private Interest "
android:textColor="@color/colorPrimary"
android:textSize="25sp" />
<com.example.tristateandroid2.radardemo.FlowLayout
android:id="@+id/flowPrivate"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</com.example.tristateandroid2.radardemo.FlowLayout>
</LinearLayout>
</LinearLayout>
</ScrollView>
</RelativeLayout>
FlowLayouDemo.java
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class FlowLayouDemo extends AppCompatActivity {
private TextView tvTitleBusiness;
private FlowLayout flowBusiness;
private TextView tvTitlePrivate;
private FlowLayout flowPrivate;
private ArrayList<TagModel> arrayList;
private void findViews() {
tvTitleBusiness = (TextView) findViewById(R.id.tvTitleBusiness);
flowBusiness = (FlowLayout) findViewById(R.id.flowBusiness);
tvTitlePrivate = (TextView) findViewById(R.id.tvTitlePrivate);
flowPrivate = (FlowLayout) findViewById(R.id.flowPrivate);
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_flow_layou_demo);
findViews();
addLayouts();
}
private void addLayouts() {
if (arrayList == null) {
arrayList = new ArrayList<>();
}
flowBusiness.removeAllViews();
flowPrivate.removeAllViews();
for (int i = 0; i < 75; i++) {
final boolean[] selected = {false};
View view = this.getLayoutInflater().inflate(R.layout.text_view, null);
final TextView textView = (TextView) view.findViewById(R.id.tvText);
if (i % 5 == 0) {
arrayList.add(new TagModel(i, false, "Business VIEW : " + i));
textView.setText("Busi VIEW To IS : " + i);
} else {
arrayList.add(new TagModel(i, false, "TEXT IS : " + i));
textView.setText("Busi IS : " + i);
}
textView.setBackgroundResource(R.drawable.unselected_tag);
textView.setTextColor(Color.parseColor("#3F51B5"));
textView.setTag(i);
if(i<=50){
flowBusiness.addView(view);
}else {
textView.setText("Priv View : "+i);
flowPrivate.addView(view);
}
textView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
if (selected[0]) {
selected[0] = false;
textView.setBackgroundResource(R.drawable.unselected_tag);
textView.setTextColor(Color.parseColor("#3F51B5"));
} else {
selected[0] = true;
textView.setBackgroundResource(R.drawable.selected_tag);
textView.setTextColor(Color.parseColor("#FFFFFF"));
}
}
});
}
}
}
像以前的答案之一一样,我从这里的解决方案开始: http : //hzqtc.github.io/2013/12/android-custom-layout-flowlayout.html
我将其扩展到以下不同高度的儿童。
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
// Custom layout that wraps child views to a new line
public class FlowLayout extends ViewGroup {
private int marginHorizontal;
private int marginVertical;
public FlowLayout(Context context) {
super(context);
init();
}
public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init();
}
private void init() { // Specify the margins for the children
marginHorizontal = getResources().getDimensionPixelSize(R.dimen.activity_half_horizontal_margin);
marginVertical = getResources().getDimensionPixelSize(R.dimen.activity_half_vertical_margin);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lowestBottom = 0;
int lineHeight = 0;
int myWidth = resolveSize(100, widthMeasureSpec);
int wantedHeight = 0;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
child.measure(getChildMeasureSpec(widthMeasureSpec, 0, child.getLayoutParams().width),
getChildMeasureSpec(heightMeasureSpec, 0, child.getLayoutParams().height));
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
lineHeight = Math.max(childHeight, lineHeight);
if (childWidth + childLeft + getPaddingRight() > myWidth) { // Wrap this line
childLeft = getPaddingLeft();
childTop = marginVertical + lowestBottom; // Spaced below the previous lowest point
lineHeight = childHeight;
}
childLeft += childWidth + marginHorizontal;
if (childHeight + childTop > lowestBottom) { // New lowest point
lowestBottom = childHeight + childTop;
}
}
wantedHeight += childTop + lineHeight + getPaddingBottom();
setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lowestBottom = 0;
int myWidth = right - left;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
if (childWidth + childLeft + getPaddingRight() > myWidth) { // Wrap this line
childLeft = getPaddingLeft();
childTop = marginVertical + lowestBottom; // Spaced below the previous lowest point
}
child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childLeft += childWidth + marginHorizontal;
if (childHeight + childTop > lowestBottom) { // New lowest point
lowestBottom = childHeight + childTop;
}
}
}
}
我用它作为包装多行 TextEdits 的解决方案。 希望有帮助!
对支持 MarginLayoutParams 的 @MattNotEquals() FlowLayout 的修订。
这只是 MarginLayoutParms 的一个极简实现,用于支持左、右、上、下边距。
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
/**
* Original version courtesy of MattNotEquals() at http://stackoverflow.com/a/34169798/4515489 - 4/13/17.
* 7/15/17 Revised to support MarginLayoutParams.
*/
public class FlowLayout extends ViewGroup {
// Custom layout that wraps child views to a new line.
public FlowLayout(Context context) {
super(context);
}
public FlowLayout(Context context, AttributeSet attrs) {
this(context, attrs, 0);
}
public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lowestBottom = 0;
int lineHeight = 0;
int myWidth = resolveSize(100, widthMeasureSpec);
int wantedHeight = 0;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
child.measure(getChildMeasureSpec(widthMeasureSpec, 0, child.getLayoutParams().width),
getChildMeasureSpec(heightMeasureSpec, 0, child.getLayoutParams().height));
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
lineHeight = Math.max(childHeight, lineHeight);
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
childLeft += lp.leftMargin;
childTop += lp.topMargin;
if (childLeft + childWidth + lp.rightMargin + getPaddingRight() > myWidth) { // Wrap this line
childLeft = getPaddingLeft() + lp.leftMargin;
childTop = lowestBottom + lp.topMargin; // Spaced below the previous lowest point
lineHeight = childHeight;
}
childLeft += childWidth + lp.rightMargin;
if (childTop + childHeight + lp.bottomMargin > lowestBottom) { // New lowest point
lowestBottom = childTop + childHeight + lp.bottomMargin;
}
}
wantedHeight += lowestBottom + getPaddingBottom(); // childTop + lineHeight + getPaddingBottom();
setMeasuredDimension(myWidth, resolveSize(wantedHeight, heightMeasureSpec));
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
int childLeft = getPaddingLeft();
int childTop = getPaddingTop();
int lowestBottom = 0;
int myWidth = right - left;
for (int i = 0; i < getChildCount(); i++) {
final View child = getChildAt(i);
if (child.getVisibility() == View.GONE) {
continue;
}
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
final LayoutParams lp = (LayoutParams) child.getLayoutParams();
childLeft += lp.leftMargin;
childTop += lp.topMargin;
if (childLeft + childWidth + lp.rightMargin + getPaddingRight() > myWidth) { // Wrap this line
childLeft = getPaddingLeft() + lp.leftMargin;
childTop = lowestBottom + lp.topMargin; // Spaced below the previous lowest point
}
child.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);
childLeft += childWidth + lp.rightMargin;
if (childTop + childHeight + lp.bottomMargin > lowestBottom) { // New lowest point
lowestBottom = childTop + childHeight + lp.bottomMargin;
}
}
}
@Override
public boolean shouldDelayChildPressedState() {
return false;
}
@Override
protected boolean checkLayoutParams(ViewGroup.LayoutParams p) {
return p instanceof LayoutParams;
}
@Override
protected LayoutParams generateDefaultLayoutParams() {
return new LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
}
@Override
public LayoutParams generateLayoutParams(AttributeSet attrs) {
return new FlowLayout.LayoutParams(getContext(), attrs);
}
@Override
protected ViewGroup.LayoutParams generateLayoutParams(ViewGroup.LayoutParams lp) {
if (lp instanceof LayoutParams) {
return new LayoutParams((LayoutParams) lp);
}
else if (lp instanceof MarginLayoutParams) {
return new LayoutParams((MarginLayoutParams) lp);
}
else
return super.generateLayoutParams(lp);
}
/**
* Per-child layout information for layouts that support margins.
*/
public static class LayoutParams extends MarginLayoutParams {
public LayoutParams(@NonNull Context c, @Nullable AttributeSet attrs) {
super(c, attrs);
}
public LayoutParams(int width, int height) {
super(width, height);
}
public LayoutParams(@NonNull ViewGroup.LayoutParams source) {
super(source);
}
public LayoutParams(@NonNull ViewGroup.MarginLayoutParams source) {
super(source);
}
public LayoutParams(@NonNull LayoutParams source) {
super(source);
}
}
}
现在使用 Flow 小部件在 ConstraintLayout 中提供了内置支持。 它有许多选项可用于实现多种类型的流程。
示例:
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.constraintlayout.helper.widget.Flow
android:layout_width="0dp"
android:layout_height="wrap_content"
app:constraint_referenced_ids="item_1,item_2,item_3"
app:flow_horizontalBias="0"
app:flow_horizontalGap="10dp"
app:flow_horizontalStyle="packed"
app:flow_verticalGap="8dp"
app:flow_wrapMode="aligned"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<View
android:id="@+id/item_1"
android:layout_width="50dp"
android:layout_height="50dp" />
<View
android:id="@+id/item_2"
android:layout_width="50dp"
android:layout_height="50dp" />
<View
android:id="@+id/item_3"
android:layout_width="50dp"
android:layout_height="50dp" />
</androidx.constraintlayout.widget.ConstraintLayout>
看看这篇文章: https : //medium.com/@tapanrgohil/constraintlayout-flow-bye-bye-to-linerlayout-78fd7fa9b679
在这里: https : //www.bignerdranch.com/blog/constraintlayout-flow-simple-grid-building-without-nested-layouts/
漂亮简单的自包含 FlowLayout 代码在这里(只有几个简洁的 gist.github 文件) :
http://hzqtc.github.io/2013/12/android-custom-layout-flowlayout.html
但是,开箱即用的活动对我来说无法加载自定义布局。
我找到了这个变通方法[使用这个例子中的 2-param .inflate() 调用] :
@Override
protected void onCreate(Bundle savedInstanceState)
{
// ..
setContentView(R.layout.main_res_layout_activity_main);
ViewGroup flowContainer = getFlowLayoutView();
// ..
}
ViewGroup getFlowLayoutView()
{
LayoutInflater inflater = getLayoutInflater();
ViewGroup flowLayout =
(ViewGroup)
inflater.inflate(
R.layout.main_res_layout_activity_main,
(FlowLayout) findViewById(R.id.flow_container)
);
return flowLayout;
}
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