1.简单的ListView
在List列表中如果不存在过于复杂的东西 我们可以直接去new ArrayAdapter() 来绘制列表,无须继承ArrayAdapter,重写它的方法。但是如果列表中过于复杂的话就需要使用自定义布局来实现List列表。
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public class SimpleList extends ListActivity { private String[] mListStr = {"姓名:某某某","性别:男","年龄:18","居住地:北京","邮箱:[email protected]"}; ListView mListView = null; @Override protected void onCreate(Bundle savedInstanceState) { mListView = getListView(); setListAdapter(new ArrayAdapter mListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView> adapterView, View view, int position,long id) { Toast.makeText(SimpleList.this,"您选择了" + mListStr[position], Toast.LENGTH_LONG).show(); } }); super.onCreate(savedInstanceState); } } |
2.带标题的ListView列表
使用 simpleAdapter 需要注意的是须要用Map
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public class TitleList extends ListActivity { private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"}; private String[] mListStr = { "某某某", "女", "18", "北京","[email protected]" }; ListView mListView = null; ArrayList
@Override protected void onCreate(Bundle savedInstanceState) { mListView = getListView(); int lengh = mListTitle.length; for(int i =0; i < lengh; i++) { Map item.put("title", mListTitle[i]); item.put("text", mListStr[i]); mData.add(item); } SimpleAdapter adapter = new SimpleAdapter(this,mData,android.R.layout.simple_list_item_2, new String[]{"title","text"},new int[]{android.R.id.text1,android.R.id.text2}); setListAdapter(adapter); mListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView> adapterView, View view, int position,long id) { Toast.makeText(TitleList.this,"您选择了标题:" + mListTitle[position] + "内容:"+mListStr[position], Toast.LENGTH_LONG).show(); } }); super.onCreate(savedInstanceState); } |
3.带图片的ListView列表
使用 simpleAdapter 来操作 但是构造simpleAdapter的时候须要使用我们自己写的布局来完成 ,因为系统的布局已经不能满足需求了,同样Map
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android:layout_width="match_parent" android:layout_height="?android:attr/listPreferredItemHeight"> android:id="@+id/image" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_alignParentBottom="true" android:adjustViewBounds="true" android:padding="2dip" /> android:id="@+id/title" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_toRightOf="@+id/image" android:layout_alignParentRight="true" android:layout_alignParentTop="true" android:layout_above="@+id/text" android:layout_alignWithParentIfMissing="true" android:gravity="center_vertical" android:textSize="15dip" /> android:id="@+id/text" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@+id/image" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:singleLine="true" android:ellipsize="marquee" android:textSize="20dip" /> |
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public class IconList extends ListActivity { private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"}; private String[] mListStr = { "某某某", "男", "30", "北京","[email protected]" }; ListView mListView = null; ArrayList
@Override protected void onCreate(Bundle savedInstanceState) { mListView = getListView(); int lengh = mListTitle.length; for(int i =0; i < lengh; i++) { Map item.put("image", R.drawable.jay); item.put("title", mListTitle[i]); item.put("text", mListStr[i]); mData.add(item); } SimpleAdapter adapter = new SimpleAdapter(this,mData,R.layout.iconlist, new String[]{"image","title","text"},new int[]{R.id.image,R.id.title,R.id.text}); setListAdapter(adapter); mListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView> adapterView, View view, int position,long id) { Toast.makeText(IconList.this,"您选择了标题:" + mListTitle[position] + "内容:"+mListStr[position], Toast.LENGTH_LONG).show(); } }); super.onCreate(savedInstanceState); } } |
4.自定义布局BaseAdapter修改列表颜色
因为通过直接 构造系统的布局来绘制列表方法肯定是有限的,所以我们需要重写绘制方法 ,写一个类去继承BaseAdapter 并实现这个类中的方法,listView在一开始绘制的时候首先会调用getCout()方法得到绘制次数 ,然后会实例化自己定义的BaseAdapter通过getView()方法一层一层绘制ListView,所以我们可以在这里面根据position(当前绘制的ID)来任意的修改绘制的内容,做出好看漂亮的ListView,下面这个例子我通过重写getView修改每个列表的颜色 并且实现用户选中后成高亮状态。
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android:layout_width="match_parent" android:layout_height="wrap_content"> android:id="@+id/color_image" android:layout_width="wrap_content" android:layout_height="match_parent" android:layout_alignParentTop="true" android:layout_alignParentBottom="true" android:adjustViewBounds="true" android:padding="2dip" /> android:id="@+id/color_title" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@+id/color_image" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:singleLine="true" android:ellipsize="marquee" android:textSize="15dip" /> android:id="@+id/color_text" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_toRightOf="@+id/color_image" android:layout_below="@+id/color_title" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:singleLine="true" android:ellipsize="marquee" android:textSize="20dip" /> |
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public class ColorList extends ListActivity { private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"}; private String[] mListStr = { "某某某", "男", "25", "北京","[email protected]" }; ListView mListView = null; MyListAdapter myAdapter = null; @Override protected void onCreate(Bundle savedInstanceState) { mListView = getListView(); myAdapter = new MyListAdapter(this); setListAdapter(myAdapter); mListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView> adapterView, View view, int position,long id) { View v=adapterView.getChildAt(position); v.setBackgroundColor(Color.RED); Toast.makeText(ColorList.this,"您选择了" + mListStr[position], Toast.LENGTH_LONG).show(); } }); super.onCreate(savedInstanceState); }
class MyListAdapter extends BaseAdapter { private int[] colors = new int[] { 0xff626569, 0xff4f5257 }; public MyListAdapter(Context context) { mContext = context; } public int getCount() { return mListStr.length; }
@Override public boolean areAllItemsEnabled() { return false; }
public Object getItem(int position) { return position; }
public long getItemId(int position) { return position; }
public View getView(int position, View convertView, ViewGroup parent) { ImageView iamge = null; TextView title = null; TextView text = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(R.layout.colorlist, null); iamge = (ImageView) convertView.findViewById(R.id.color_image); title =(TextView) convertView.findViewById(R.id.color_title); text= (TextView) convertView.findViewById(R.id.color_text); } int colorPos = position % colors.length; convertView.setBackgroundColor(colors[colorPos]); title.setText(mListTitle[position]); text.setText(mListStr[position]); iamge.setImageResource(R.drawable.jay); return convertView; }
private Context mContext; } } |
5.自定义布局ArrayAdapter
ArrayAdapter是BaseAdapter的子类,ArrayAdapter不仅具有BaseAdapter的所有方法还自定义了一些新的方法来处理列表项,所以单纯的从功能能上来讲ArrayAdapter远远强与BaseAdapter,如果是绘制一些数量比较少的列表建议使用BaseAdapter 如果绘制一些比较复杂的列表项 并且列表项很多的 建议使用ArrayAdapter。
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android:layout_width="match_parent" android:layout_height="wrap_content"> |
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public class ArrayList extends ListActivity { private String[] mListTitle = { "姓名", "性别", "年龄", "居住地","邮箱"}; private String[] mListStr = { "某某某", "男", "20", "北京", "[email protected]" }; ListView mListView = null; MyListAdapter myAdapter = null; ArrayList arrayList = null; @Override protected void onCreate(Bundle savedInstanceState) { arrayList = this; mListView = getListView(); myAdapter = new MyListAdapter(this,R.layout.arraylist); setListAdapter(myAdapter); super.onCreate(savedInstanceState); }
public class MyListAdapter extends ArrayAdapter { int mTextViewResourceID = 0; private Context mContext;
public MyListAdapter(Context context, int textViewResourceId) { super(context, textViewResourceId); mTextViewResourceID = textViewResourceId; mContext = context; } private int[] colors = new int[] { 0xff626569, 0xff4f5257 };
public int getCount() { return mListStr.length; }
@Override public boolean areAllItemsEnabled() { return false; }
public Object getItem(int position) { return position; }
public long getItemId(int position) { return position; }
public View getView(final int position, View convertView, ViewGroup parent) { ImageView iamge = null; TextView title = null; TextView text = null; Button button = null; if (convertView == null) { convertView = LayoutInflater.from(mContext).inflate(mTextViewResourceID, null); iamge = (ImageView) convertView.findViewById(R.id.array_image); title = (TextView) convertView.findViewById(R.id.array_title); text = (TextView) convertView.findViewById(R.id.array_text); button = (Button)convertView.findViewById(R.id.array_button); button.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { Toast.makeText(arrayList,"您点击的第"+position +"个按钮", Toast.LENGTH_LONG).show(); } }); } int colorPos = position % colors.length; convertView.setBackgroundColor(colors[colorPos]); title.setText(mListTitle[position]); text.setText(mListStr[position]); if(colorPos == 0) iamge.setImageResource(R.drawable.jay); else iamge.setImageResource(R.drawable.image); return convertView; } } } |
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