work_weipa_viewpager

最新推荐文章于 2014-09-05 17:55:51 发布

原创最新推荐文章于 2014-09-05 17:55:51 发布 · 342 阅读

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本文解决了ViewPager中ListView的Item控件无法正常实现点击事件的问题，并避免了各Item间的控件相互影响的情况。通过将控件声明为局部变量而非成员变量的方式，确保每个Item拥有独立的控件实例。

问题：viewpager中的listview中的item控件无法实现，且各个item中的控件相互影响？

回答：在getView()中实现控件点击事件时，不可设置全局变量

例子：

错误：

private TextView tv_num;
	private ImageView iv_zan;
	private LinearLayout ll_homework,ll_share;

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {

		View v = View.inflate(context, R.layout.my_show_detail_list_item, null);

		// 获取控件对象
		TextView tv_repeat = (TextView) v.findViewById(R.id.tv_repeat);

		// 获取商品位置
		Themes entity = entities.get(position);
		System.out.println(entities);
		// 设置值
		tv_repeat.setText(entity.getTitle());

		// 获取上传作业对象
		ll_homework = (LinearLayout) v.findViewById(R.id.ll_homework);
		ll_homework.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(context, MainActivity.class);
				intent.putExtra("type", 2);
				intent.putExtra("position", 1);
				context.startActivity(intent);
			}
		});
		
		tv_num = (TextView) v.findViewById(R.id.tv_num);
		iv_zan = (ImageView) v.findViewById(R.id.iv_zan);		
		iv_zan.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				String s = tv_num.getText().toString().trim();
				int i = Integer.parseInt(s);
				i = i + 1;
				tv_num.setText(i + "");
			}			
		});

		ll_share = (LinearLayout) v.findViewById(R.id.ll_share);
		ll_share.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(context, ShareActivity.class);
				context.startActivity(intent);
			}
		});

		return v;
	}

正确：

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {

		View v = View.inflate(context, R.layout.my_show_detail_list_item, null);

		// 获取控件对象
		TextView tv_repeat = (TextView) v.findViewById(R.id.tv_repeat);

		// 获取商品位置
		Themes entity = entities.get(position);
		System.out.println(entities);
		// 设置值
		tv_repeat.setText(entity.getTitle());

		// 获取上传作业对象
		LinearLayout ll_homework = (LinearLayout) v.findViewById(R.id.ll_homework);
		ll_homework.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(context, MainActivity.class);
				intent.putExtra("type", 2);
				intent.putExtra("position", 1);
				context.startActivity(intent);
			}
		});
		
		final TextView tv_num = (TextView) v.findViewById(R.id.tv_num);
		ImageView iv_zan = (ImageView) v.findViewById(R.id.iv_zan);		
		iv_zan.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				String s = tv_num.getText().toString().trim();
				int i = Integer.parseInt(s);
				i = i + 1;
				tv_num.setText(i + "");
			}			
		});

		LinearLayout ll_share = (LinearLayout) v.findViewById(R.id.ll_share);
		ll_share.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent = new Intent(context, ShareActivity.class);
				context.startActivity(intent);
			}
		});

		return v;
	}