GridView示例2（自动增长）

第一步：布局xml

 <LinearLayout android:layout_width="fill_parent" android:layout_height="wrap_content"
    android:background="@drawable/redball_ground">
<GridView 
	android:layout_width="fill_parent" android:layout_height="fill_parent"
	android:padding="10dip" android:verticalSpacing="10dip"
	android:horizontalSpacing="10dip" android:numColumns="auto_fit"
	android:columnWidth="60dip" android:stretchMode="columnWidth"
	android:gravity="center" android:id="@+id/grid"/>
</LinearLayout>

 第二步：定义图片的个数以及其他

// --点击次数 集合
	private ArrayList<String> redBallList = new ArrayList<String>();
	private GridView gv_red_ball;
	private String FirstGV = "REDBALL";
	// --红色球
	int RED_BALL_COUNT = 33;// 球的个数
	int RED_LINE_COUNT = 0;
	private Drawable tv_gray_draw;
	private Drawable tv_red_draw;
	private Bitmap orgimg;
	private int width;// 获取原始图片宽度

 

第三步：创建Activity

①：设置获取屏幕宽度

	// 屏幕宽度
		DisplayMetrics dm = new DisplayMetrics();
		getWindowManager().getDefaultDisplay().getMetrics(dm);
		int screenwidth = dm.widthPixels;

 

②：加载原始图片，获取尺寸

	// 加载原始图片
		orgimg = BitmapFactory.decodeResource(getResources(),
				R.drawable.red_ball);// 将图片解析成二进制,getResources()是加载资源文件
		width = orgimg.getWidth();

 

③：设置每行图片个数

	RED_LINE_COUNT  = screenwidth / width;

 

④：设置列数

gv_red_ball.setNumColumns(RED_LINE_COUNT);
		gv_red_ball.setOnItemClickListener(new GridItemClickListener(FirstGV,
				RED_BALL_COUNT));
		gv_red_ball.setAdapter(new BallAdapter(this, tv_gray_draw));

 第四：创建所需类OnItemClickListener

class GridItemClickListener implements OnItemClickListener {

		String ballColor;
		int ballCount;

		public GridItemClickListener(String ballColor, int ballCount) {
			super();
			this.ballColor = ballColor;
			this.ballCount = ballCount;
		}

		public void onItemClick(AdapterView<?> arg0, View view, int position,
				long arg3) {
			TextView tv_ball = (TextView) view;
			Drawable current_draw = tv_ball.getBackground();
			String ball_num = tv_ball.getText().toString();

			if (ballColor.equals(FirstGV)) {
				ballCount = RED_BALL_COUNT;
				if (current_draw == tv_gray_draw) {
					tv_ball.setBackgroundDrawable(tv_red_draw);
					tv_ball.setTextColor(Color.WHITE);
				} else {
					tv_ball.setBackgroundDrawable(tv_gray_draw);
					tv_ball.setTextColor(Color.BLACK);
				}
				if (redBallList.contains(ball_num)) {
					redBallList.remove(ball_num);
				} else {
					redBallList.add(ball_num);
				}
			}
		}
	}

 

第五步：创建构造函数，来继承Baseadapter

public int getRED_BALL_COUNT() {
		return RED_BALL_COUNT;
	}

	public void setRED_BALL_COUNT(int rED_BALL_COUNT) {
		RED_BALL_COUNT = rED_BALL_COUNT;
	}
	// 自定义适配器
	class BallAdapter extends BaseAdapter {
		// 上下文环境
		Context context;
		Drawable drawable;
		// 构造方法
		public BallAdapter(Context context, Drawable drawable) {
			super();
			this.context = context;
			this.drawable = drawable;
		}

		// 获得数量
		public int getCount() {
			// TODO Auto-generated method stub
			if (drawable == tv_gray_draw) {
				return getRED_BALL_COUNT();
			} else {
				return 0;
			}
		}
		// 获得当前选项
		public Object getItem(int item) {
			return item;
		}
		// 获得当前选项ID
		public long getItemId(int id) {
			return id;
		}

		public View getView(int position, View convertView, ViewGroup parent) {
			TextView tv_ball;

			if (convertView == null) {
				// 实例化ImageView对象
				tv_ball = new TextView(context);
				tv_ball.setLayoutParams(new GridView.LayoutParams(
						LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT));
			} else {
				tv_ball = (TextView) convertView;
			}
			tv_ball.setGravity(Gravity.CENTER);
			tv_ball.setTextColor(Color.BLACK);
			TextPaint tp = tv_ball.getPaint();
			tp.setFakeBoldText(true);
			tv_ball.setBackgroundDrawable(drawable);
			tv_ball.setText((position + 1) + "");

			return tv_ball;
		}
	}