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怎样使用ListView?
怎样使用ListView?
ArrayAdapter的使用
package com.mengmeng.android_listview; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.AdapterView.OnItemClickListener; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.Toast; public class MainActivity extends Activity implements OnItemClickListener { private ListView mListView; private ArrayAdapter<String> mArray_Adapter; private SimpleAdapter mSimpleAdapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listView); //载入数据源 String[] str = {"大眼萌1","大眼萌2","大眼萌3","大眼萌4","大眼萌5"}; mArray_Adapter = new ArrayAdapter<String>(this, android.R.layout.simple_expandable_list_item_1, str); mListView.setAdapter(mArray_Adapter); mListView.setOnItemClickListener(this); } //监听 @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { String text = mListView.getItemAtPosition(arg2)+""; Toast.makeText(this, text, Toast.LENGTH_SHORT).show(); } }
simpleAdapter的使用
@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listView); getData(); mSimpleAdapter = new SimpleAdapter (this, list, R.layout.list_item, new String[] {"text","image"}, new int[] {R.id.text,R.id.image}); mListView.setAdapter(mSimpleAdapter); } private List<Map<String,Object>> getData(){ list = new ArrayList<Map<String,Object>>(); Map<String,Object> map1 = new HashMap<String, Object>(); map1.put("text", "java"); map1.put("image", R.drawable.ic_launcher); Map<String,Object> map2 = new HashMap<String, Object>(); map2.put("text", "javaScript"); map2.put("image", R.drawable.ic_launcher); Map<String,Object> map3 = new HashMap<String, Object>(); map3.put("text", "C++"); map3.put("image", R.drawable.ic_launcher); Map<String,Object> map4 = new HashMap<String, Object>(); map4.put("text", "Android"); map4.put("image", R.drawable.ic_launcher); Map<String,Object> map5 = new HashMap<String, Object>(); map5.put("text", "web"); map5.put("image", R.drawable.ic_launcher); list.add(map1); list.add(map2); list.add(map3); list.add(map4); list.add(map5); return list; }
<h3>使用OnScollListener() notifyDataSetChanged()</h3>@Override public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) { // TODO Auto-generated method stub } @Override public void onScrollStateChanged(AbsListView view, int scrollState) { if(scrollState == SCROLL_STATE_FLING){//用力划一下 Map<String, Object> map = new HashMap<String, Object>(); map.put("text", "正在加入"+i++); map.put("image", R.drawable.ic_launcher); list.add(map); <strong>mSimpleAdapter.notifyDataSetChanged();</strong> Toast.makeText(this, "正在滚动...", Toast.LENGTH_SHORT).show(); }else if(scrollState == SCROLL_STATE_IDLE){//停止滚动 }else if(scrollState == SCROLL_STATE_TOUCH_SCROLL){//正在滚动 }
怎样使用ListView?
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