********随便看看**********
2015-05-04 19:59
288 查看
*********根据新浪微博随便看看实现下拉刷新功能*******
一、项目开发
1、 项目开发效果图
二、在android环境下建立连接和实现等,通过建立新的项目newProject,实现预期的功能
代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/liner"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="6dip"
android:background="#FA8072">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="随便看看"
android:textSize="15sp"
android:textColor="@android:color/white"
/>
</LinearLayout>
<bzu.edu.hou.view.MyListView
android:id="@+id/myListView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</bzu.edu.hou.view.MyListView>
</LinearLayout>
2、获得数据源,并在MainActivity.java中获得数组资源
public class MainActivity extends Activity {
private MyListView mylistview=null;
private List<Messages> list_msg=null;
private BaseAdapter adapter=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
init();
if(list_msg==null){
getData();
}
adapter=new ArticleAdapter(this,list_msg);
mylistview.setAdapter(adapter);
}
private void getData() {
// TODO Auto-generated method stub
//获得xml的资源
String names[];
String article[];
TypedArray img;
int i;
names=getResources().getStringArray(R.array.name);
article=getResources().getStringArray(R.array.article);
img=getResources().obtainTypedArray(R.array.head_photo);
list_msg=new ArrayList<Messages>();
for(i=0;i<names.length;i++){
Messages message=new Messages();
message.setImg(img.getDrawable(i));
message.setName(names[i]);
message.setArticel(article[i]);
message.setRq("人气:"+String.valueOf(new Random().nextInt(1000)));
Date date=new Date();
SimpleDateFormat simple=new SimpleDateFormat("MM-dd");
message.setTime(simple.format(date));
list_msg.add(message);
}
}
3,编写ArticleAdapter类。它继承BaseAdapter类,重写其方法,在getView并将List中的每一条数据都对应布局中的控件
public class ArticleAdapter extends BaseAdapter {
private List<Messages> list_mes=null;
private Context context;
public ArticleAdapter(Context context,List<Messages> list_mes) {
// TODO Auto-generated constructor stub
this.list_mes=list_mes;
this.context=context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list_mes.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list_mes.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ListItem listitem;
if(convertView==null)
{
convertView=(LinearLayout)LayoutInflater.from(context).inflate(R.layout.list_layout, null);
listitem=new ListItem();
listitem.img=(ImageView)convertView.findViewById(R.id.head_img);
listitem.name=(TextView)convertView.findViewById(R.id.name);
listitem.time=(TextView)convertView.findViewById(R.id.time);
listitem.rq=(TextView)convertView.findViewById(R.id.rq);
listitem.article=(TextView)convertView.findViewById(R.id.article);
convertView.setTag(listitem);
}else {
listitem=(ListItem)convertView.getTag();
}
listitem.img.setImageDrawable(list_mes.get(position).getImg());
listitem.name.setText(list_mes.get(position).getName());
listitem.time.setText(list_mes.get(position).getTime());
listitem.rq.setText(list_mes.get(position).getRq());
listitem.article.setText(list_mes.get(position).getArticel());
return convertView;
}
public class ListItem{
ImageView img;
TextView name;
TextView time;
TextView rq;
TextView article;
}
}
3、根据头部判定是否刷新
4.HeaderView类:此类重写了LinearLayout
}
5.header_view加载布局代码
一、项目开发
1、 项目开发效果图
二、在android环境下建立连接和实现等,通过建立新的项目newProject,实现预期的功能
代码如下:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/liner"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="6dip"
android:background="#FA8072">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="随便看看"
android:textSize="15sp"
android:textColor="@android:color/white"
/>
</LinearLayout>
<bzu.edu.hou.view.MyListView
android:id="@+id/myListView1"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
</bzu.edu.hou.view.MyListView>
</LinearLayout>
2、获得数据源,并在MainActivity.java中获得数组资源
public class MainActivity extends Activity {
private MyListView mylistview=null;
private List<Messages> list_msg=null;
private BaseAdapter adapter=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
init();
if(list_msg==null){
getData();
}
adapter=new ArticleAdapter(this,list_msg);
mylistview.setAdapter(adapter);
}
private void getData() {
// TODO Auto-generated method stub
//获得xml的资源
String names[];
String article[];
TypedArray img;
int i;
names=getResources().getStringArray(R.array.name);
article=getResources().getStringArray(R.array.article);
img=getResources().obtainTypedArray(R.array.head_photo);
list_msg=new ArrayList<Messages>();
for(i=0;i<names.length;i++){
Messages message=new Messages();
message.setImg(img.getDrawable(i));
message.setName(names[i]);
message.setArticel(article[i]);
message.setRq("人气:"+String.valueOf(new Random().nextInt(1000)));
Date date=new Date();
SimpleDateFormat simple=new SimpleDateFormat("MM-dd");
message.setTime(simple.format(date));
list_msg.add(message);
}
}
3,编写ArticleAdapter类。它继承BaseAdapter类,重写其方法,在getView并将List中的每一条数据都对应布局中的控件
public class ArticleAdapter extends BaseAdapter {
private List<Messages> list_mes=null;
private Context context;
public ArticleAdapter(Context context,List<Messages> list_mes) {
// TODO Auto-generated constructor stub
this.list_mes=list_mes;
this.context=context;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list_mes.size();
}
@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list_mes.get(position);
}
@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
ListItem listitem;
if(convertView==null)
{
convertView=(LinearLayout)LayoutInflater.from(context).inflate(R.layout.list_layout, null);
listitem=new ListItem();
listitem.img=(ImageView)convertView.findViewById(R.id.head_img);
listitem.name=(TextView)convertView.findViewById(R.id.name);
listitem.time=(TextView)convertView.findViewById(R.id.time);
listitem.rq=(TextView)convertView.findViewById(R.id.rq);
listitem.article=(TextView)convertView.findViewById(R.id.article);
convertView.setTag(listitem);
}else {
listitem=(ListItem)convertView.getTag();
}
listitem.img.setImageDrawable(list_mes.get(position).getImg());
listitem.name.setText(list_mes.get(position).getName());
listitem.time.setText(list_mes.get(position).getTime());
listitem.rq.setText(list_mes.get(position).getRq());
listitem.article.setText(list_mes.get(position).getArticel());
return convertView;
}
public class ListItem{
ImageView img;
TextView name;
TextView time;
TextView rq;
TextView article;
}
}
3、根据头部判定是否刷新
Handler handler=new Handler(new Handler.Callback() { @Override public boolean handleMessage(Message arg0) { // TODO Auto-generated method stub if(arg0.what==0){ //结束刷新 mylistview.endOnRersh(); } return false; } });
class OnRershListener implements OnRersh{ //实现刷新接口的 方法,,在MyList中会回调该方法。 //模拟 @Override public void OnRershListener() { // TODO Auto-generated method stub new Thread(new Run()).start();//启动一个线程 }
class Run implements Runnable{ @Override public void run() { // TODO Auto-generated method stub try { Thread.sleep(2000); } catch (Exception e) { // TODO: handle exception e.printStackTrace(); } handler.sendEmptyMessage(0); } } |
public class MyListView extends ListView { private HeaderView head_view=null; //起始的y坐标 private float pageY = 0f; //阻尼器 private float DAMPER=1.25f; private OnRersh onRershListener=null; public MyListView(Context context, AttributeSet attrs) { super(context, attrs); // TODO Auto-generated constructor stub initView(context); } private void initView(Context context) { // TODO Auto-generated method stub head_view=new HeaderView(context); this.addHeaderView(head_view); } //触摸事件方法,发生屏幕按下、抬起、滑动,程序都回调该方法 @Override public boolean onTouchEvent(MotionEvent ev) { // TODO Auto-generated method stub /**
switch (ev.getAction()) { case MotionEvent.ACTION_DOWN: pageY=ev.getY(); break; case MotionEvent.ACTION_MOVE: float move=0;//移动的距离 move=ev.getY()-pageY; pageY=ev.getY(); if(head_view.getSTATE()!=HeaderView.UPDATA && getFirstVisiblePosition()==0 && (move/DAMPER+head_view.getHeaderViewHight())>0){ setHeaderViewHight(move/DAMPER); return true; } break; case MotionEvent.ACTION_UP: switch (head_view.getSTATE()) { case HeaderView.DOWN: //下拉显示状态,不刷新,高度0 setHeaderViewHight(-head_view.getHeaderViewHight()); break; case HeaderView.UPDATA: //刷新状态 break; case HeaderView.UP: //开始刷新 setHeaderViewHight(75-head_view.getHeaderViewHight());//设置HeaderView的高为75 head_view.setSTATE(HeaderView.UPDATA); head_view.setTime(); //调用刷新接口 if(onRershListener!=null){ onRershListener.OnRershListener(); } break; } break; } return super.onTouchEvent(ev); }
private void setHeaderViewHight(float f) { // TODO Auto-generated method stub //设置HeaderView的高度 并给HeaderView设置不同的状态。(不同的状态显示不同的header样式) /* * 1, 调用Headeview的方法设置其高度 2,判断Headeview的状态不是UPDATA 判断HeaderView的高度,来设置状态 (1)距离大于60---设置UP (2)否则大于0---设置Down */ head_view.setHeaderViewHight((int)(f+head_view.getHeaderViewHight())); if(head_view.getSTATE()!=HeaderView.UPDATA){ if(head_view.getHeaderViewHight()>75){ head_view.setSTATE(HeaderView.UP);//上拉状态 }else if(head_view.getHeaderViewHight()>0) { head_view.setSTATE(HeaderView.DOWN); } } } public void setOnRershListener(OnRersh onRershListener) { this.onRershListener = onRershListener; } /**结束刷新*/ public void endOnRersh() { // TODO Auto-generated method stub //状态设置为Down(默认的初始状态),高度0 head_view.setSTATE(HeaderView.DOWN); head_view.setHeaderViewHight(-(int)head_view.getHeaderViewHight()); }} |
public class HeaderView extends LinearLayout { private LinearLayout linear=null; //当前状态 private int STATE=DOWN; //下拉状态 public static final int DOWN=0; //上拉状态 public static final int UP=1; //刷新状态 public static final int UPDATA=2; //布局控件 private TextView t1,t2=null; private ImageView img=null; private ProgressBar probar=null; //旋转动画对象 private RotateAnimation rotate1,rotate2=null; public HeaderView(Context context) { super(context); // TODO Auto-generated constructor stub //初始化刷新头部 initView(context); } private void initView(Context context) { // TODO Auto-generated method stub /* 1,加载header_view布局 2,初始化创建动画对象 * */ linear=(LinearLayout)LayoutInflater.from(context).inflate(R.layout.header_view, null);//加载布局,第二个对象表示根视图,null表示此布局是根视图。 LinearLayout.LayoutParams layoutparams=new LinearLayout.LayoutParams(LinearLayout.LayoutParams.MATCH_PARENT, 0); this.addView(linear, layoutparams); //初始化布局控件 t1=(TextView)linear.findViewById(R.id.text); t2=(TextView)linear.findViewById(R.id.text1); img=(ImageView)linear.findViewById(R.id.pull); probar=(ProgressBar)linear.findViewById(R.id.progress); //创建动画对象 rotate1 = new RotateAnimation(0, -180, 1, 0.5f, 1, 0.5f);//中点逆时针旋转180度。 rotate2 = new RotateAnimation(-180, 0, 1, 0.5f, 1, 0.5f); rotate1.setDuration(200); rotate2.setDuration(200); rotate1.setFillAfter(true); rotate2.setFillAfter(true); } /** * 设置view的高度 * */ public void setHeaderViewHight(int height){ if(height<0){ height=0; } //获得HeaderView的布局设置 LinearLayout.LayoutParams layp=(LayoutParams)linear.getLayoutParams(); layp.height=height; //设置HeaderView的高度 linear.setLayoutParams(layp); } public int getSTATE() { return STATE; } /** * 根据父容器MyListView的触摸位移 * 设置HeaderView的显示条的状态 * */ public void setSTATE(int sTATE) { //显示条的3种状态 /* * 1,下拉状态: * 显示img,隐藏进度条 * 判断上一个状态,如果是上拉则开始动画2,回到原始状态(触摸移动发生时,有向上移动)。 * 2,刷新状态 * 隐藏img,显示进度条 * 3,上拉状态 * 显示img,隐藏进度条 * 判断上一个状态,如果是下拉则开始动画1. * */ switch (sTATE) { case DOWN://下拉状态 t1.setText("下拉刷新"); img.setVisibility(View.VISIBLE); probar.setVisibility(View.GONE); switch (STATE) {//某一时刻 开始动画。 case DOWN: break; case UP: img.startAnimation(rotate2);//如果上一个状态是下拉,则返回原始 break; } break; case UPDATA: t1.setText("正在刷新"); img.clearAnimation();//清除动画 img.setVisibility(View.GONE); probar.setVisibility(View.VISIBLE); switch (STATE) { case DOWN: break; case UPDATA: break; case UP: break; } break; case UP: t1.setText("松开刷新"); img.setVisibility(View.VISIBLE); probar.setVisibility(View.GONE); switch (STATE) { case DOWN: img.startAnimation(rotate1);//如果上一个状态是旋转上拉动画, break; case UPDATA: break; case UP: break; } break; } STATE = sTATE;//设置当前的状态 } /**获得header的高度*/ public float getHeaderViewHight() { // TODO Auto-generated method stub return linear.getHeight(); } public void setTime(){ Date date=new Date(); SimpleDateFormat simple=new SimpleDateFormat("yyyy/MM/dd hh:mm:ss"); String datatime=simple.format(date); t2.setText("刷新时间:"+datatime); }
}
5.header_view加载布局代码
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:background="#ffffff" android:gravity="center_vertical" android:orientation="vertical" > <RelativeLayout android:layout_width="match_parent" android:layout_height="75px" android:gravity="center"> <TextView android:id="@+id/text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下拉刷新" android:textSize="17sp" android:layout_centerHorizontal="true" /> <TextView android:id="@+id/text1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="时间:刚刚" android:textSize="14sp" android:layout_below="@id/text" android:gravity="center" android:layout_centerHorizontal="true"/> <ImageView android:id="@+id/pull" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/pull_down" android:layout_marginRight="10dip" android:layout_toLeftOf="@id/text1"/> <ProgressBar android:id="@+id/progress" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginRight="10dip" android:layout_toLeftOf="@id/text1"/> </RelativeLayout></LinearLayout> |