GridView解决同一行item的高度不一样，如何同一行统一高度问题？

问题描述：

有时我们使用GridView会面对类似这种情况。

这是是不是一脸愣逼，我们理想情况是把他变成这样

 保证同一行的item都是一样高这样就美观许多了  

注意：上面的两张图片是盗图，用来作为效果观看的，自己在手机上截图比较麻烦(其实就是懒 哈哈~)

解决方案：

　　　　 第一种方式 (不推荐)： 不怎么灵活，比较麻烦 ，自己改写adapter中的代码 参考这个：https://blog.csdn.net/zhi890701/article/details/50510822

　　　　第二种方式（推荐）：因为博主用的是通用的adapter自己改起来比较麻烦还要测试，所以就看看有没有重写GridView的，正好被博主找到了，很方便

　　　　https://github.com/JJdeGroot/AutoGridView 

　　　　使用起来也方便里面就写了一个AutoGridView.java直接拷贝到项目中就可以和普通GridView一样使用了懒的话就直接拷贝我这代码就行了  代码：

import android.content.Context;
import android.content.res.Configuration;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.GridView;
import android.widget.ListAdapter;

/**
 * Automatically calculates the ideal for each row
 * @author JJ
 *
 */
public class AutoGridView extends GridView {

    private static final String TAG = "AutoGridView";
    private int numColumnsID;
    private int previousFirstVisible;
    private int numColumns = 1;
    
    public AutoGridView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init(attrs);
    }
    
    public AutoGridView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(attrs);
    }
    
    public AutoGridView(Context context) {
        super(context);
    }
    
    /**
     * Sets the numColumns based on the attributeset
     */
    private void init(AttributeSet attrs) {
        // Read numColumns out of the AttributeSet
        int count = attrs.getAttributeCount();
        if(count > 0) {
            for(int i = 0; i < count; i++) {
                String name = attrs.getAttributeName(i);
                if(name != null && name.equals("numColumns")) {
                    // Update columns
                    this.numColumnsID = attrs.getAttributeResourceValue(i, 1);
                    updateColumns();
                    break;
                }
            }
        }
        Log.d(TAG, "numColumns set to: " + numColumns);
    }

    
    /**
     * Reads the amount of columns from the resource file and
     * updates the "numColumns" variable
     */
    private void updateColumns() {
        this.numColumns = getContext().getResources().getInteger(numColumnsID);
    }
    
    @Override
    public void setNumColumns(int numColumns) {
        this.numColumns = numColumns;
        super.setNumColumns(numColumns);
    
        Log.d(TAG, "setSelection --> " + previousFirstVisible);
        setSelection(previousFirstVisible);
    }
    
    @Override
    protected void onLayout(boolean changed, int leftPos, int topPos, int rightPos, int bottomPos) {
        super.onLayout(changed, leftPos, topPos, rightPos, bottomPos);
        setHeights();
    }
    
    @Override
    protected void onConfigurationChanged(Configuration newConfig) {
        updateColumns();
        setNumColumns(this.numColumns);
    }
    
    @Override
    protected void onScrollChanged(int newHorizontal, int newVertical, int oldHorizontal, int oldVertical) {
        // Check if the first visible position has changed due to this scroll
        int firstVisible = getFirstVisiblePosition();
        if(previousFirstVisible != firstVisible) {
            // Update position, and update heights
            previousFirstVisible = firstVisible;
            setHeights();
        }
        
        super.onScrollChanged(newHorizontal, newVertical, oldHorizontal, oldVertical);
    }
    
    /**
     * Sets the height of each view in a row equal to the height of the tallest view in this row.
     * @param firstVisible The first visible position (adapter order)
     */
    private void setHeights() {
        ListAdapter adapter = getAdapter();
        
        if(adapter != null) {
            for(int i = 0; i < getChildCount(); i+=numColumns) {
                // Determine the maximum height for this row
                int maxHeight = 0;
                for(int j = i; j < i+numColumns; j++) {
                    View view = getChildAt(j);
                    if(view != null && view.getHeight() > maxHeight) {
                        maxHeight = view.getHeight();
                    }
                }
                //Log.d(TAG, "Max height for row #" + i/numColumns + ": " + maxHeight);
                
                // Set max height for each element in this row
                if(maxHeight > 0) {
                    for(int j = i; j < i+numColumns; j++) {
                        View view = getChildAt(j);
                        if(view != null && view.getHeight() != maxHeight) {
                            view.setMinimumHeight(maxHeight);
                        }
                    }
                }
            }
        }
    }
}

 还可以参考这个项目内容  https://github.com/etsy/AndroidStaggeredGrid  看介绍可以实现瀑布流哦  具体自行了解下