android gridview画分割线

1。先上图：

2.具体实现代码：

public class LineGridView extends GridView {    public LineGridView(Context context) {        super(context);        // TODO Auto-generated constructor stub    }    public LineGridView(Context context, AttributeSet attrs) {        super(context, attrs);    }    public LineGridView(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);    }    @Override    protected void dispatchDraw(Canvas canvas) {        super.dispatchDraw(canvas);        View localView1 = getChildAt(0);
        //判断data是否有数据
       if(localView1!=null){       
       int column = getWidth() / localView1.getWidth();//计算出一共有多少列，假设有3列        int childCount = getChildCount();//子view的总数        System.out.println("子view的总数childCount==" + childCount);        Paint localPaint;//画笔        localPaint = new Paint();
        localPaint.setStyle(Paint.Style.STROKE);        localPaint.setColor(getContext().getResources().getColor(R.color.line));//设置画笔的颜色        for (int i = 0; i < childCount; i++) {//遍历子view            View cellView = getChildAt(i);//获取子view            if (i < 3) {//第一行                canvas.drawLine(cellView.getLeft(), cellView.getTop(), cellView.getRight(), cellView.getTop(), localPaint);            }            if (i % column == 0) {//第一列                canvas.drawLine(cellView.getLeft(), cellView.getTop(), cellView.getLeft(), cellView.getBottom(), localPaint);            }            if ((i + 1) % column == 0) {//第三列                //画子view底部横线                canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);                canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);            } else if ((i + 1) > (childCount - (childCount % column))) {//如果view是最后一行                //画子view的右边竖线                canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);                canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);            } else {//如果view不是最后一行                //画子view的右边竖线                canvas.drawLine(cellView.getRight(), cellView.getTop(), cellView.getRight(), cellView.getBottom(), localPaint);                //画子view的底部横线                canvas.drawLine(cellView.getLeft(), cellView.getBottom(), cellView.getRight(), cellView.getBottom(), localPaint);            }        }    }
 }
}

3.main里的方法：

public class Main2Activity extends Activity {    LineGridView gridview;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main2);        gridview = (LineGridView) findViewById(R.id.gridview);        findViewById(R.id.tv).setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                finish();            }        });        final MyAdapter myAdapter = new MyAdapter();        gridview.setOnItemClickListener(new AdapterView.OnItemClickListener() {            @Override            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {                myAdapter.setSelectItem(position);            }        });        gridview.setAdapter(myAdapter);    }    private class MyAdapter extends BaseAdapter {        @Override        public int getCount() {            return 5;        }        @Override        public Object getItem(int position) {            return null;        }        @Override        public long getItemId(int position) {            return 0;        }        @Override        public View getView(int position, View convertView, ViewGroup parent) {            View v = View.inflate(Main2Activity.this, R.layout.gride_list_item, null);            LinearLayout ll = (LinearLayout) v.findViewById(R.id.ll);            if (position == currentItem) {//选中的item                ll.setBackgroundColor(Main2Activity.this.getResources().getColor(R.color.item_select));            } else {                ll.setBackgroundColor(Main2Activity.this.getResources().getColor(R.color.white));            }            return v;        }        private int currentItem = 0;        public void setSelectItem(int position) {            currentItem = position;            notifyDataSetChanged();        }    }

4， activity_main2.xml代码：

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"                xmlns:tools="http://schemas.android.com/tools"                android:layout_width="match_parent"                android:layout_height="match_parent"                android:background="#ffffff"                tools:context="com.zdy.bbs_bbb.clicktoast.Main2Activity">    <TextView        android:id="@+id/tv"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:padding="10dp"        android:text="@string/hello_world"/>    <com.zdy.bbs_bbb.clicktoast.LineGridView        android:padding="3dp"        android:layout_margin="10dp"        android:id="@+id/gridview"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_below="@id/tv"        android:background="#ffffff"        android:gravity="center"        android:listSelector="@null"        android:numColumns="3"        android:stretchMode="columnWidth"        /></RelativeLayout>

gride_list_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="match_parent"
              android:gravity="center"
              android:id="@+id/ll"
              android:background="@color/item_select"
              android:orientation= "vertical" >

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:src="@mipmap/ic_launcher"
        />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="10dp"
        android:text="全部"
        />

</LinearLayout>
这里没把不足一行补足画线，自己可以修改一下