मैंने कुछ इसी तरह लागू किया, लेकिन मुझे लगता है कि रिक्ति और पैडिंग को संभालने के लिए थोड़ा अधिक मानक तरीका है। कृपया मुझे बताएं कि आप लोग क्या सोचते हैं, और बिना किसी कारण के पुन: उपयोग करने के लिए स्वतंत्र महसूस करते हैं:
package com.asolutions.widget;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
import com.asolutions.widget.R;
public class RowLayout extends ViewGroup {
public static final int DEFAULT_HORIZONTAL_SPACING = 5;
public static final int DEFAULT_VERTICAL_SPACING = 5;
private final int horizontalSpacing;
private final int verticalSpacing;
private List<RowMeasurement> currentRows = Collections.emptyList();
public RowLayout(Context context, AttributeSet attrs) {
super(context, attrs);
TypedArray styledAttributes = context.obtainStyledAttributes(attrs, R.styleable.RowLayout);
horizontalSpacing = styledAttributes.getDimensionPixelSize(R.styleable.RowLayout_android_horizontalSpacing,
DEFAULT_HORIZONTAL_SPACING);
verticalSpacing = styledAttributes.getDimensionPixelSize(R.styleable.RowLayout_android_verticalSpacing,
DEFAULT_VERTICAL_SPACING);
styledAttributes.recycle();
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
final int widthMode = MeasureSpec.getMode(widthMeasureSpec);
final int heightMode = MeasureSpec.getMode(heightMeasureSpec);
final int maxInternalWidth = MeasureSpec.getSize(widthMeasureSpec) - getHorizontalPadding();
final int maxInternalHeight = MeasureSpec.getSize(heightMeasureSpec) - getVerticalPadding();
List<RowMeasurement> rows = new ArrayList<RowMeasurement>();
RowMeasurement currentRow = new RowMeasurement(maxInternalWidth, widthMode);
rows.add(currentRow);
for (View child : getLayoutChildren()) {
LayoutParams childLayoutParams = child.getLayoutParams();
int childWidthSpec = createChildMeasureSpec(childLayoutParams.width, maxInternalWidth, widthMode);
int childHeightSpec = createChildMeasureSpec(childLayoutParams.height, maxInternalHeight, heightMode);
child.measure(childWidthSpec, childHeightSpec);
int childWidth = child.getMeasuredWidth();
int childHeight = child.getMeasuredHeight();
if (currentRow.wouldExceedMax(childWidth)) {
currentRow = new RowMeasurement(maxInternalWidth, widthMode);
rows.add(currentRow);
}
currentRow.addChildDimensions(childWidth, childHeight);
}
int longestRowWidth = 0;
int totalRowHeight = 0;
for (int index = 0; index < rows.size(); index++) {
RowMeasurement row = rows.get(index);
totalRowHeight += row.getHeight();
if (index < rows.size() - 1) {
totalRowHeight += verticalSpacing;
}
longestRowWidth = Math.max(longestRowWidth, row.getWidth());
}
setMeasuredDimension(widthMode == MeasureSpec.EXACTLY ? MeasureSpec.getSize(widthMeasureSpec) : longestRowWidth
+ getHorizontalPadding(), heightMode == MeasureSpec.EXACTLY ? MeasureSpec.getSize(heightMeasureSpec)
: totalRowHeight + getVerticalPadding());
currentRows = Collections.unmodifiableList(rows);
}
private int createChildMeasureSpec(int childLayoutParam, int max, int parentMode) {
int spec;
if (childLayoutParam == LayoutParams.FILL_PARENT) {
spec = MeasureSpec.makeMeasureSpec(max, MeasureSpec.EXACTLY);
} else if (childLayoutParam == LayoutParams.WRAP_CONTENT) {
spec = MeasureSpec.makeMeasureSpec(max, parentMode == MeasureSpec.UNSPECIFIED ? MeasureSpec.UNSPECIFIED
: MeasureSpec.AT_MOST);
} else {
spec = MeasureSpec.makeMeasureSpec(childLayoutParam, MeasureSpec.EXACTLY);
}
return spec;
}
@Override
protected void onLayout(boolean changed, int leftPosition, int topPosition, int rightPosition, int bottomPosition) {
final int widthOffset = getMeasuredWidth() - getPaddingRight();
int x = getPaddingLeft();
int y = getPaddingTop();
Iterator<RowMeasurement> rowIterator = currentRows.iterator();
RowMeasurement currentRow = rowIterator.next();
for (View child : getLayoutChildren()) {
final int childWidth = child.getMeasuredWidth();
final int childHeight = child.getMeasuredHeight();
if (x + childWidth > widthOffset) {
x = getPaddingLeft();
y += currentRow.height + verticalSpacing;
if (rowIterator.hasNext()) {
currentRow = rowIterator.next();
}
}
child.layout(x, y, x + childWidth, y + childHeight);
x += childWidth + horizontalSpacing;
}
}
private List<View> getLayoutChildren() {
List<View> children = new ArrayList<View>();
for (int index = 0; index < getChildCount(); index++) {
View child = getChildAt(index);
if (child.getVisibility() != View.GONE) {
children.add(child);
}
}
return children;
}
protected int getVerticalPadding() {
return getPaddingTop() + getPaddingBottom();
}
protected int getHorizontalPadding() {
return getPaddingLeft() + getPaddingRight();
}
private final class RowMeasurement {
private final int maxWidth;
private final int widthMode;
private int width;
private int height;
public RowMeasurement(int maxWidth, int widthMode) {
this.maxWidth = maxWidth;
this.widthMode = widthMode;
}
public int getHeight() {
return height;
}
public int getWidth() {
return width;
}
public boolean wouldExceedMax(int childWidth) {
return widthMode == MeasureSpec.UNSPECIFIED ? false : getNewWidth(childWidth) > maxWidth;
}
public void addChildDimensions(int childWidth, int childHeight) {
width = getNewWidth(childWidth);
height = Math.max(height, childHeight);
}
private int getNewWidth(int childWidth) {
return width == 0 ? childWidth : width + horizontalSpacing + childWidth;
}
}
}
इसके लिए भी /res/values/attrs.xml के तहत एक प्रविष्टि की आवश्यकता होती है, जिसे आप बना सकते हैं यदि यह पहले से ही वहां नहीं है।
<?xml version="1.0" encoding="utf-8"?>
<resources>
<declare-styleable name="RowLayout">
<attr name="android:verticalSpacing" />
<attr name="android:horizontalSpacing" />
</declare-styleable>
</resources>
एक xml लेआउट में उपयोग इस तरह दिखता है:
<?xml version="1.0" encoding="utf-8"?>
<com.asolutions.widget.RowLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:padding="10dp"
android:horizontalSpacing="10dp"
android:verticalSpacing="20dp">
<FrameLayout android:layout_width="30px" android:layout_height="40px" android:background="#F00"/>
<FrameLayout android:layout_width="60px" android:layout_height="40px" android:background="#F00"/>
<FrameLayout android:layout_width="70px" android:layout_height="20px" android:background="#F00"/>
<FrameLayout android:layout_width="20px" android:layout_height="60px" android:background="#F00"/>
<FrameLayout android:layout_width="10px" android:layout_height="40px" android:background="#F00"/>
<FrameLayout android:layout_width="40px" android:layout_height="40px" android:background="#F00"/>
<FrameLayout android:layout_width="40px" android:layout_height="40px" android:background="#F00"/>
<FrameLayout android:layout_width="40px" android:layout_height="40px" android:background="#F00"/>
</com.asolutions.widget.RowLayout>
