android gridview画分割线

android gridview画分割线

android gridview画分割线，如图：

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);
        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);
            }
        }
    }
}

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();
        }
    }

                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">

            android:id="@+id/tv"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dp"
        android:text="@string/hello_world"/>

            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"
        />

              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" >

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

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

     今天我们来模仿一下支付宝钱包首页中带有分割线的GridView，俗称九宫格。先上图，是你想要的效果么？如果是请继续往下看。