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
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>
<?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>
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。
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。
