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   源码介绍

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public class PhotoActivity extends Activity  {
	private GridView gv,gl_bottom;
	private PhotoAibum aibum;
	private PhotoAdappter adapter;
	private TextView tv;
	private int chooseNum = 0;
	private Button btn_sure;
	private LayoutInflater inflater;
	
	private ArrayList<PhotoItem> gl_arr=new ArrayList<PhotoItem>();
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_photoalbum_gridview);
		btn_sure=(Button)findViewById(R.id.btn_sure);
		aibum = (PhotoAibum)getIntent().getExtras().get("aibum");
		/**获取已经选择的图片**/
		for (int i = 0; i < aibum.getBitList().size(); i  ) {
			if(aibum.getBitList().get(i).isSelect()){
				chooseNum  ;
			}
		}
		gv =(GridView)findViewById(R.id.photo_gridview);
		gl_bottom=(GridView)findViewById(R.id.gl_bottom);
		adapter = new PhotoAdappter(this,aibum,null);
		gv.setAdapter(adapter);
		gv.setOnItemClickListener(gvItemClickListener);
		btn_sure.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Toast.makeText(PhotoActivity.this, paths.toString(), 3000).show();
				Log.e("info", paths.toString());
			}
		});
		gl_bottom.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView<?> parent, View view,
					int position, long id) {
				String path=gl_adapter.getItem(position).getPath();
				Intent intent=new Intent(PhotoActivity.this, ShowBigPic.class);
				intent.putExtra("path", path);
				startActivity(intent);
			}
		});
	}
	PhotoAdappter gl_adapter= new PhotoAdappter(this,aibum,gl_arr);//
	private void inite(PhotoItem str,boolean isSeclect){//初始化被选中的图片的方法  将图片添加或者删除
		
		if (isSeclect) {
			btn_sure.setText("确定(" gl_arr.size() ")");
		}
	   else{
		btn_sure.setText("确定(" gl_arr.size() ")");
	}
	inflater = (LayoutInflater) this
			.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
	gl_bottom.setAdapter(gl_adapter);
	int size = gl_arr.size();
	DisplayMetrics dm = new DisplayMetrics();
	getWindowManager().getDefaultDisplay().getMetrics(dm);
	float density = dm.density;
	int allWidth = (int) (110 * size * density);
	int itemWidth = (int) (75 * density);
	LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
			allWidth, LinearLayout.LayoutParams.FILL_PARENT);
	gl_bottom.setLayoutParams(params);
	gl_bottom.setColumnWidth(itemWidth);
	gl_bottom.setHorizontalSpacing(10);
	gl_bottom.setStretchMode(GridView.NO_STRETCH);
	gl_bottom.setNumColumns(size);
	
}
	private ArrayList<String> paths=new ArrayList<String>();
	private ArrayList<String> ids=new ArrayList<String>();
	private OnItemClickListener gvItemClickListener = new OnItemClickListener() {

		@Override
		public void onItemClick(AdapterView<?> parent, View view, int position,
				long id) {
			PhotoItem gridItem=aibum.getBitList().get(position);
			if( aibum.getBitList().get(position).isSelect()){
				aibum.getBitList().get(position).setSelect(false);
				paths.remove(aibum.getBitList().get(position).getPath());
				ids.remove(aibum.getBitList().get(position).getPhotoID() "");
				gl_arr.remove(aibum.getBitList().get(position));
				chooseNum--;
				inite(aibum.getBitList().get(position), aibum.getBitList().get(position).isSelect());
			}else{
				aibum.getBitList().get(position).setSelect(true);
				ids.add(aibum.getBitList().get(position).getPhotoID() "");
				paths.add(aibum.getBitList().get(position).getPath());
				gl_arr.add(aibum.getBitList().get(position));
				chooseNum  ;
				inite(aibum.getBitList().get(position), aibum.getBitList().get(position).isSelect());
			}
			adapter.notifyDataSetChanged();
		}
	};
}