AndroidLinearLayout实现自动换行

package com.huanglong.mylinearlayout;
 
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.View;
import android.view.ViewGroup;
 
/**
 * @author huanglong 2013-5-28 自定义自动换行LinearLayout
 */
public class FixGridLayout extends ViewGroup {
 private int mCellWidth;
 private int mCellHeight;
 
 public FixGridLayout(Context context) {
  super(context);
 }
 
 public FixGridLayout(Context context, AttributeSet attrs) {
  super(context, attrs);
 }
 
 public FixGridLayout(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
 }
 
 public void setmCellWidth(int w) {
  mCellWidth = w;
  requestLayout();
 }
 
 public void setmCellHeight(int h) {
  mCellHeight = h;
  requestLayout();
 }
 
 /**
  * 控制子控件的换行
  */
 @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 j = 0; j = (columns - 1)) {
    i = 0;
    x = 0;
    y += cellHeight;
   } else {
    i++;
    x += cellWidth;
 
   }
  }
 }
 
 /**
  * 计算控件及子控件所占区域
  */
 @Override
 protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
  // 创建测量参数
  int cellWidthSpec = MeasureSpec.makeMeasureSpec(mCellWidth, MeasureSpec.AT_MOST);
  int cellHeightSpec = MeasureSpec.makeMeasureSpec(mCellHeight, MeasureSpec.AT_MOST);
  // 记录ViewGroup中Child的总个数
  int count = getChildCount();
  // 设置子空间Child的宽高
  for (int i = 0; i 

package com.huanglong.mylinearlayout;
 
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.CheckBox;
import android.widget.SimpleAdapter;
import android.support.v4.app.NavUtils;
 
public class MainActivity extends Activity {
 private SimpleAdapter adapter;
 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  FixGridLayout fixGridLayout = (FixGridLayout) findViewById(R.id.ll);
  fixGridLayout.setmCellHeight(30);
  fixGridLayout.setmCellWidth(100);
  for (int i = 0; i <7; i++) {
   CheckBox box = new CheckBox(MainActivity.this);
   box.setText("第"+i+"个");
   fixGridLayout.addView(box);
  }
 }
 
 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  getMenuInflater().inflate(R.menu.activity_main, menu);
  return true;
 }
 
 
}