使用TextWatcher监听EditText_对textwatcher监听怎么用-优快云博客

本文介绍了一种基于TextWatcher的实时搜索实现方案，通过监听EditText输入变化触发数据库查询，并使用SimpleAdapter更新ListView显示结果。

通讯录搜索功能，每输入一个字符，就会监听有所变化，这用到了TextWatcher监听EditText

this.search_content = (EditText) findViewById(R.id.search_content);
search_content.addTextChangedListener(new TextFilter());

TextFilter如下：

class TextFilter implements TextWatcher {
		@Override
		public void afterTextChanged(Editable s) {
			// TODO Auto-generated method stub
		}
		@Override
		public void beforeTextChanged(CharSequence s, int start, int count,
				int after) {
			// TODO Auto-generated method stub
		}
		@Override
		public void onTextChanged(CharSequence s, int start, int before,
				int count) {
			searchContent = search_content.getText().toString();
			// 从数据库中获得查询的联系人
			contactDao = new ContactDao(getApplicationContext());
			String Sql = "select * from contact_usr where username like '%"
					+ searchContent + "%'";
			String message = contactDao.execQuery(Sql);
			search_userdata = getUserData(message);

			// 为联系人创建listitem适配器
			SimpleAdapter adapter = new MyAdapter(SearchUserActivity.this,
					search_userdata, R.layout.userlist_item_layout,
					new String[] { "user_photo", "user_name", "user_tel",
							"user_store" }, new int[] { R.id.user_phote,
							R.id.user_name, R.id.user_tel, R.id.store_user });
			// 将listitem绑定到适配器上
			search_user_list.setAdapter(adapter);

		}

	}