Android 根据item大小实现自动排列的GridLayout
16lz
2021-01-23
源码
1. res/values/attrs.xml
2. res/drawable-hdpi/bugdroid.png
3. res/layout/main.xml
<?xml version="1.0" encoding="utf-8"?> 4. src/com/example/android/fixedgridlayout/FixedGridLayout.java
package com.example.android.fixedgridlayout;import android.content.Context;import android.content.res.TypedArray;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;/** * A layout that arranges its children in a grid. The size of the cells is set * by the {@link #setCellSize} method and the android:cell_width and * android:cell_height attributes in XML. The number of rows and columns is * determined at runtime. Each cell contains exactly one view, and they flow in * the natural child order (the order in which they were added, or the index in * {@link #addViewAt}. Views can not span multiple cells. */public class FixedGridLayout extends ViewGroup { int mCellWidth; int mCellHeight; public FixedGridLayout(Context context) { super(context); } public FixedGridLayout(Context context, AttributeSet attrs) { super(context, attrs); // Read the resource attributes. TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.FixedGridLayout); mCellWidth = a.getDimensionPixelSize(R.styleable.FixedGridLayout_cellWidth, -1); mCellHeight = a.getDimensionPixelSize(R.styleable.FixedGridLayout_cellHeight, -1); a.recycle(); } public void setCellWidth(int px) { mCellWidth = px; requestLayout(); } public void setCellHeight(int px) { mCellHeight = px; requestLayout(); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int cellWidthSpec = MeasureSpec.makeMeasureSpec(mCellWidth, MeasureSpec.AT_MOST); int cellHeightSpec = MeasureSpec.makeMeasureSpec(mCellHeight, MeasureSpec.AT_MOST); int count = getChildCount(); for (int index = 0; index < count; index++) { final View child = getChildAt(index); child.measure(cellWidthSpec, cellHeightSpec); } // Use the size our parents gave us setMeasuredDimension(resolveSize(mCellWidth * count, widthMeasureSpec), resolveSize(mCellHeight * count, heightMeasureSpec)); } @Override protected void onLayout(boolean changed, int l, int t, int r, int b) { int cellWidth = mCellWidth; int cellHeight = mCellHeight; int columns = (r - l) / cellWidth; if (columns < 0) { columns = 1; } int x = 0; int y = 0; int i = 0; int count = getChildCount(); for (int index = 0; index < count; index++) { final View child = getChildAt(index); int w = child.getMeasuredWidth(); int h = child.getMeasuredHeight(); int left = x + ((cellWidth - w) / 2); int top = y + ((cellHeight - h) / 2); child.layout(left, top, left + w, top + h); if (i >= (columns - 1)) { // advance to next row i = 0; x = 0; y += cellHeight; } else { i++; x += cellWidth; } } }}5. com.example.android.fixedgridlayout.FixedGridLayoutTest.java
package com.example.android.fixedgridlayout;import android.app.Activity;import android.os.Bundle;public class FixedGridLayoutTest extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); FixedGridLayout grid = (FixedGridLayout) findViewById(R.id.grid); grid.setCellWidth(150); grid.setCellHeight(180); }}说明
FixedGridLayoutTest类，设置如下大小：
grid.setCellWidth(150);
grid.setCellHeight(180);
效果图：
FixedGridLayoutTest类，设置如下大小：
grid.setCellWidth(280);
grid.setCellHeight(180);
效果图：
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