Android ListView item 选中高亮显示

很多时候我们在使用ListView的时候，当用户点击某一个Item之后，需要让它的背景色和字体颜色都发生改变以示区别，本例实现了这个功能。

思路：在Adapter类中保存一个变量，记录当前用户选择的item的位置，并在getView 中进行判断， 在ListView的item点击事件 onItemClick 方法中更新UI，并记录点击item的位置。

实现的效果如下：

主界面 MainActivity.java

package com.example.selecthighlight;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

	private ListView mListView;
	private List dataList = new ArrayList();
	private char[] chs = { 'A', 'B', 'C', 'D', 'E', 'M', 'L', 'F', 'X', 'W',
			'Z' };
	private HightKeywordsAdapter mAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		findViewById();
		initListViewData();
		setListener();
	}

	private void setListener() {

		mAdapter = new HightKeywordsAdapter();

		mListView.setAdapter(mAdapter);
		mListView.setOnItemClickListener(new OnItemClickListener() {

			@Override
			public void onItemClick(AdapterView parent, View view,
					int position, long id) {

				Toast.makeText(getApplicationContext(), "click " + position,
						Toast.LENGTH_SHORT).show();

				mAdapter.setSelectItem(position); // 记录当前选中的item

				mAdapter.notifyDataSetInvalidated();	//更新UI界面
				// mAdapter.notifyDataSetChanged();
			}

		});
	}

	private void initListViewData() {

		for (char ch : chs) {

			for (int i = 0; i < 5; i++) {

				Data data = new Data(String.valueOf(ch) + "中国",
						String.valueOf(ch) + i, String.valueOf(ch));

				dataList.add(data);
			}
		}

	}

	private void findViewById() {
		mListView = (ListView) findViewById(R.id.mListView);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

	/**
	 * Customize Adapter, so that realize highlighted keywords
	 */
	private class HightKeywordsAdapter extends BaseAdapter {

		private int selectItem = -1;

		public void setSelectItem(int selectItem) {
			this.selectItem = selectItem;
		}

		@Override
		public int getCount() {

			return dataList.size();
		}

		@Override
		public Object getItem(int position) {

			return dataList.get(position);
		}

		@Override
		public long getItemId(int position) {

			return position;
		}

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

			View view;
			ViewHolder holder;

			if (convertView == null) {

				holder = new ViewHolder();

				view = View.inflate(getApplicationContext(),
						R.layout.list_item, null);

				holder.tv_name = (TextView) view.findViewById(R.id.tv_name);
				holder.tv_en = (TextView) view.findViewById(R.id.tv_en);
				holder.tv_sen = (TextView) view.findViewById(R.id.tv_sen);

				view.setTag(holder);
			} else {
				view = convertView;
				holder = (ViewHolder) view.getTag();
			}

			if (position == selectItem) {	//选中状态 高亮
				view.setBackgroundColor(Color.YELLOW);
				holder.tv_name.setTextColor(getResources().getColor(R.color.color_green));
				holder.tv_en.setTextColor(getResources().getColor(R.color.color_green));
				holder.tv_sen.setTextColor(getResources().getColor(R.color.color_green));
			} else {	//正常状态
				view.setBackgroundColor(getResources().getColor(R.color.color_blue));
				holder.tv_name.setTextColor(getResources().getColor(R.color.color_white));
				holder.tv_en.setTextColor(getResources().getColor(R.color.color_white));
				holder.tv_sen.setTextColor(getResources().getColor(R.color.color_white));
			}

			Data data = dataList.get(position);

			holder.tv_name.setText(data.getName());

			holder.tv_en.setText(data.getEn());
			holder.tv_sen.setText(data.getSen());

			return view;
		}
	}

	static class ViewHolder {
		public TextView tv_name;
		public TextView tv_en;
		public TextView tv_sen;

	}

}

主界面布局文件 activity_main.xml

数据Bean Data.java

package com.example.selecthighlight;

public class Data {
	private String name;
	private String en;
	private String sen;
	
	public Data(String name, String en, String sen) {
		this.name = name;
		this.en = en;
		this.sen = sen;
	}
	
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEn() {
		return en;
	}
	public void setEn(String en) {
		this.en = en;
	}
	public String getSen() {
		return sen;
	}
	public void setSen(String sen) {
		this.sen = sen;
	}
	
}

public void notifyDataSetChanged ()
           该方法内部实现了在每个观察者上面调用onChanged事件。每当发现数据集有改变的情况，或者读取到数据的新状态时，就会调用此方法。notifyDataSetInvalidated()，会重绘控件（还原到初始状态）

public void notifyDataSetInvalidated ()
           该方法内部实现了在每个观察者上面调用onInvalidated事件。每当发现数据集监控有改变的情况，就会调用此方法。notifyDataSetChanged()，重绘当前可见区域

如果大家有更好的实现方式，记得告诉我哦！