Android 流式布局LinearLayout

在安卓中，我们并没有现成的布局去实现自动流式的布局，这里给大家分享一个 FlowLinearLayout 。希望能帮到有需要的人。

package com.utils.widget;

import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.widget.LinearLayout;

public class FlowLinearLayout extends LinearLayout {

private int paddingy = 0;
private int paddingx = 10;

public FlowLinearLayout(Context context) {
this(context, null);
}

public FlowLinearLayout(Context context, AttributeSet attrs) {
super(context, attrs);
}

@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int maxWidth = MeasureSpec.getSize(widthMeasureSpec);
int childCount = getChildCount();
int x = 0;
int y = 0;
int row = 0;

for (int index = 0; index < childCount; index++) {
final View child = getChildAt(index);
if (child.getVisibility() != View.GONE) {
child.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
x += width;
if (index != 0) x += paddingx;
y = row * height + height;
if (x > maxWidth) {
x = width;
row++;
y = row * height + height;
y += row * paddingy;
} else if (row > 0) {
y = row * height + height;
y += row * paddingy;
}
}
}
setMeasuredDimension(maxWidth, y);
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
final int childCount = getChildCount();
int maxWidth = r - l;
int x = 0;
int y = 0;
int row = 0;
for (int i = 0; i < childCount; i++) {
final View child = this.getChildAt(i);
if (child.getVisibility() != View.GONE) {
int width = child.getMeasuredWidth();
int height = child.getMeasuredHeight();
x += width;
if (i != 0) x += paddingx;
y = row * height + height;
if (x > maxWidth) {
x = width;
row++;
y = row * height + height;
y += row * paddingy;
} else if (row > 0) {
y = row * height + height;
y += row * paddingy;
}
child.layout(x - width, y - height, x, y);
}
}
}

public int getPY() {
return paddingy;
}

public void setPY(int paddingy) {
this.paddingy = paddingy;
}

public int getPX() {
return paddingx;
}

public void setPX(int paddingx) {
this.paddingx = paddingx;
}
}