ListView加载特效

（1）首先是透明界面的实现http://zhaohaiyang.blog.51cto.com/2056753/517044

 透明界面的实现可以在XML里面修改属性。

 首先在Androidmanifest.xml中加上

 <activity android:name=".WordSearch"

           android:label="@string/app_name"

          android:theme="@style/transparent">

 </activity>

  

     再在res/values/colors.xml中加上

 <resources>

          <drawable name="translucent_background">#7F000000</drawable>

 </resources>

     最后在styles.xml中添加以下代码

 <resources>

      <style name="transparent">    

      <item name="android:windowBackground">@drawable/translucent_background</item>

      <item name="android:windowIsTranslucent">true</item>

      </style>

 </resources>

  

    这样该Activity就为透明的了。

 貌似还可在代码里面修改，具体怎么实现我还没试过

 

注：#7F000000表示颜色，其中前两位表示透明度（00—FF），后面六位表示颜色（000000纯黑 ，FFFFFF纯白）。

 

 

（2）ListView随EditView的改变动态刷新

 

 EditView不能监听Text的改变，要想监听Text的改变则需使用TextWatcher类。下面是主要代码

 

     ArrayList<String> strs=new ArrayList<String>();

   ListView view=null;

     EditText et=null;

 ArrayAdapter<String> adapter;

 TextWatcher watcher；

 

 protected void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         requestWindowFeature(Window.FEATURE_NO_TITLE);

         setContentView(R.layout.wordsearch);

     

         et=(EditText)this.findViewById(R.id.result);

         view=(ListView)this.findViewById(R.id.ListView01);

      

         adapter=new ArrayAdapter<String>(this,R.layout.words_item,strs);

         view.setAdapter(adapter);

 

  et.addTextChangedListener(watcher);      

 }

 

 TextWatcher watcher=new 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) {

          String string=et.getText().toString();

          strs.add(string);

          adapter.notifyDataSetChanged();

    /*

   这里可以调用adapter.notifyDataSetChanged();

   或是直接改变adapter  然后调用view.setAdapter(adapter)；即可

   */

      }

 }

------------------------------------------------------------------------------------------

ListView实现分页加载和滚动加载,发现可以用listView的OnScroll方法来实现,直接上代码

ListViewScroll.java

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package zy.lucifer.ListViewScroll;  
import android.app.Activity;  
import android.os.Bundle;  
import android.util.Log;  
import android.view.Gravity;  
import android.view.View;  
import android.view.ViewGroup;  
import android.widget.AbsListView;  
import android.widget.BaseAdapter;  
import android.widget.LinearLayout;  
import android.widget.ListView;  
import android.widget.ProgressBar;  
import android.widget.TextView;  
import android.widget.Toast;  
import android.widget.AbsListView.OnScrollListener;  
import android.widget.LinearLayout.LayoutParams;  
public class ListViewScroll extends Activity {  
    /** Called when the activity is first created. */  
    private LayoutParams mLayoutParams = new LinearLayout.LayoutParams(  
            LinearLayout.LayoutParams.WRAP_CONTENT,  
            LinearLayout.LayoutParams.WRAP_CONTENT);  
    /** 
     * 设置布局显示目标最大化属性 
     */  
    private LayoutParams FFlayoutParams = new LinearLayout.LayoutParams(  
            LinearLayout.LayoutParams.FILL_PARENT,  
            LinearLayout.LayoutParams.FILL_PARENT);  
    ListView listView ;  
    private int lastItem = 0;  
    LinearLayout loadingLayout;  
    private listViewAdapter adapter;  
    @Override  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.main);  
        listView = (ListView) findViewById(R.id.myList);  
          
        Log.i("test", "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>");  
        // 线性布局  
        LinearLayout layout = new LinearLayout(this);  
        // 设置布局 水平方向  
        layout.setOrientation(LinearLayout.HORIZONTAL);  
        // 进度条  
        ProgressBar progressBar = new ProgressBar(this);  
        // 进度条显示位置  
        progressBar.setPadding(0, 0, 15, 0);  
        // 把进度条加入到layout中  
        layout.addView(progressBar, mLayoutParams);  
        // 文本内容  
        TextView textView = new TextView(this);  
        textView.setText("加载中...");  
        textView.setGravity(Gravity.CENTER_VERTICAL);  
        // 把文本加入到layout中  
        layout.addView(textView, FFlayoutParams);  
        // 设置layout的重力方向，即对齐方式是  
        layout.setGravity(Gravity.CENTER);  
        // 设置ListView的页脚layout  
        loadingLayout = new LinearLayout(this);  
        loadingLayout.addView(layout, mLayoutParams);  
        loadingLayout.setGravity(Gravity.CENTER);  
        listView.addFooterView(loadingLayout);  
        adapter = new listViewAdapter();  
        listView.setAdapter(adapter);  
        listView.setOnScrollListener(new OnScrollListener() {  
   
            @Override  
            public void onScroll(AbsListView view, int firstVisibleItem,  
                    int visibleItemCount, int totalItemCount) {  
                // TODO Auto-generated method stub  
                Log.i("test" , "Scroll>>>first: " + firstVisibleItem + ", visible: " + visibleItemCount + ", total: " + totalItemCount);  
                lastItem = firstVisibleItem + visibleItemCount - 1;  
                Log.i("test" , "Scroll>>>lastItem:" + lastItem);  
                //显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件  
                int scrolllength=101;  
                if (adapter.count<=scrolllength) {  
                    if (firstVisibleItem+visibleItemCount==totalItemCount) {  
                        adapter.count += 10;  
                        adapter.notifyDataSetChanged();  
                        listView.setSelection(lastItem);  
                        int currentPage=adapter.count/10;  
                        Toast.makeText(getApplicationContext(), "第"+currentPage+"页", Toast.LENGTH_LONG).show();  
                    }  
                }  
                else {  
                     listView.removeFooterView(loadingLayout);   
                }  
            }  
            @Override  
            public void onScrollStateChanged(AbsListView view, int scrollState) {  
                // TODO Auto-generated method stub  
            }  
        });  
    }  
    class listViewAdapter extends BaseAdapter {  
        int count = 10; /* starting amount */  
        public int getCount() {  
            return count;  
        }  
        public Object getItem(int pos) {  
            return pos;  
        }  
        public long getItemId(int pos) {  
            return pos;  
        }  
        public View getView(int pos, View v, ViewGroup p) {  
            Log.i("test", "getView>>>pos:" + pos);  
            TextView view;  
            if (v == null) {  
                view = new TextView(ListViewScroll.this);  
            } else {  
                view = (TextView) v;  
            }  
            view.setText("ListItem " + pos);  
            view.setTextSize(20f);  
            view.setGravity(Gravity.CENTER);  
            view.setHeight(60);  
            return view;  
              
        }  
    }  
}  
main.xml

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<?xml version="1.0" encoding="utf-8"?>  
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"  
    android:layout_height="fill_parent"  
    >  
<ListView android:cacheColorHint="#00000000" android:id="@+id/myList"  
android:layout_width="fill_parent" android:layout_height="fill_parent"  
        >  
    </ListView>  
</LinearLayout>

---------------------------------------------

如果你对Android系统自带的UI控件感觉不够满意，可以尝试下自定义控件，我们就以Button为例，很早以前Android123就写到过Android Button按钮控件美化方法里面提到了xml的selector构造。当然除了使用drawable这样的图片外今天Android开发网谈下自定义图形shape的方法，对于Button控件Android上支持以下几种属性shape、gradient、stroke、corners等。
  我们就以目前系统的Button的selector为例说下:
          <shape>
            <gradient
                android:startColor="#ff8c00"
                android:endColor="#FFFFFF"
                android:angle="270" />
            <stroke
                android:width="2dp"
                android:color="#dcdcdc" />
            <corners
                android:radius="2dp" />
            <padding
                android:left="10dp"
                android:top="10dp"
                android:right="10dp"
                android:bottom="10dp" />
        </shape>

    对于上面，这条shape的定义，分别为渐变，在gradient中startColor属性为开始的颜色，endColor为渐变结束的颜色，下面的angle是角度。接下来是stroke可以理解为边缘，corners为拐角这里radius属性为半径，最后是相对位置属性padding。
 对于一个Button完整的定义可以为
  <?xml version="1.0" encoding="utf-8"?>
<selector
    xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" >
        <shape>
            <gradient
                android:startColor="#ff8c00"
                android:endColor="#FFFFFF"
                android:angle="270" />
            <stroke
                android:width="2dp"
                android:color="#dcdcdc" />
            <corners
                android:radius="2dp" />
            <padding
                android:left="10dp"
                android:top="10dp"
                android:right="10dp"
                android:bottom="10dp" />
        </shape>
    </item>
    <item android:state_focused="true" >
        <shape>
            <gradient
                android:startColor="#ffc2b7"
                android:endColor="#ffc2b7"
                android:angle="270" />
            <stroke
                android:width="2dp"
                android:color="#dcdcdc" />
            <corners
                android:radius="2dp" />
            <padding
                android:left="10dp"
                android:top="10dp"
                android:right="10dp"
                android:bottom="10dp" />
        </shape>
    </item>
    <item>        
        <shape>
            <gradient
                android:startColor="#ff9d77"
                android:endColor="#ff9d77"
                android:angle="270" />
            <stroke
                android:width="2dp"
                android:color="#fad3cf" />
            <corners
                android:radius="2dp" />
            <padding
                android:left="10dp"
                android:top="10dp"
                android:right="10dp"
                android:bottom="10dp" />
        </shape>
    </item>
</selector>
注意Android123提示大家，以上几个item的区别主要是体现在state_pressed按下或state_focused获得焦点时，当当来判断显示什么类型，而没有state_xxx属性的item可以看作是常规状态下。