Android Custom ListView Layout implements pull-load drop-down refresh function _android

There are a number of ways that ListView can implement pull loads and drop-down refreshes. The following is a custom layout I wrote, and the reusability is also relatively strong. The first is the inherited ListView custom View.

Autolistview.java:

Package Com.example.mic.testdemo.view; 
Import Android.annotation.TargetApi; 
Import Android.content.Context; 
Import Android.os.Build; 
Import Android.os.Bundle; 
Import Android.util.AttributeSet; 
Import Android.util.Log; 
Import Android.view.LayoutInflater; 
Import android.view.MotionEvent; 
Import Android.view.View; 
Import Android.view.ViewGroup; 
Import android.view.animation.Animation; 
Import Android.view.animation.LinearInterpolator; 
Import android.view.animation.RotateAnimation; 
Import Android.widget.AbsListView; 
Import Android.widget.ImageView; 
Import Android.widget.ListView; 
Import Android.widget.ProgressBar; 
Import Android.widget.TextView; 
Import COM.EXAMPLE.MIC.TESTDEMO.R; 
Import Java.text.SimpleDateFormat; 
 /** * Created by Dflenovo on 2016/8/3. */public class Autolistview extends ListView implements Abslistview.onscrolllistener {public static final String FOO 
  TER = "FOOTER"; 
  public static final String Header = "header"; private static final int Pull = 1; 
  private static final int NONE = 0; 
  private static final int release = 2; 
  private static final int refreshing = 2; 
  private static final int space = 20; 
  private static final String TAG = "Autolistview"; 
  Private Rotateanimation downanimation; 
  Private Rotateanimation upanimation; 
  private context; 
  Private Layoutinflater Inflater; 
  Private View footer; 
  Private View header; 
  private int headercontentinitialheight; 
  private int headercontentheight; 
  Private Onrefreshlistener Onrefreshlistener; 
  Private Boolean loadenable; 
  Private Onloadlistener Onloadlistener; 
  private int firstvisibleitem; 
  Private Boolean isloadingmore = false; 
  private int starty; 
  private int state; 
  Private ImageView Iv_pull; 
  private int footerviewheight; 
  Private ProgressBar Mprogressbar; 
  Private TextView tvstate; 
  Private TextView Tvlastupdatetime; 
  Private Boolean Isscrolltobottom; Public Autolistview {Super (context); 
  Initview (context); 
    Public Autolistview (context, AttributeSet attrs) {Super (context, attrs); 
  Initview (context); Autolistview (context, AttributeSet attrs, int defstyleattr) {Super (context, attrs, defstyleattr) 
    ; 
  Initview (context); } @TargetApi (Build.version_codes. Lollipop) public Autolistview (context, AttributeSet attrs, int defstyleattr, int defstyleres) {SUPER (cont 
    Ext, Attrs, defstyleattr, defstyleres); 
  Initview (context); 
    private void Initview (context context) {Initheaderview (); 
    Initfooterview (); 
This.setonscrolllistener (this); private void Initheaderview () {header = View.inflate (GetContext (), r.layout.pull_to_refresh_header, NULL) 
    ; 
    Iv_pull = (ImageView) header. Findviewbyid (R.id.iv_pull); 
    Mprogressbar = (ProgressBar) header. Findviewbyid (R.id.pb_listview_header); Tvstate = (TextView) header. findviewbYid (r.id.tv_listview_header_state); 
    Tvlastupdatetime = (TextView) header. Findviewbyid (R.id.tv_listview_header_last_update_time); 
    Set the last Refresh Time Tvlastupdatetime.settext ("Last Refresh Time:" + getlastupdatetime ()); Header.measure (0, 0); 
    The system will help us measure the height of the Headerview headercontentheight = Header.getmeasuredheight (); 
    Header.setpadding (0,-headercontentheight, 0, 0); This.addheaderview (header,header,true); 
  Add a View object Initanimation () to the top of the ListView;  } private void Initanimation () {upanimation = new rotateanimation (0f, -180f, Animation.relative_to_self, 
    0.5f, Animation.relative_to_self, 0.5f); 
    Upanimation.setduration (500); Upanimation.setfillafter (TRUE); After the animation is over, stay at the end of the position downanimation = new Rotateanimation ( -180f, -360f, Animation.relative_to_self, 0.5f, Anim ation. 
    Relative_to_self, 0.5f); 
    Downanimation.setduration (500); Downanimation.setfillafter (TRUE); After the animation ends, stay at the end of the position of the PrivAte String Getlastupdatetime () {SimpleDateFormat SDF = new SimpleDateFormat ("Yyyy-mm-dd HH:mm:ss"); 
  Return Sdf.format (System.currenttimemillis ()); 
    private void Initfooterview () {footer = View.inflate (GetContext (), r.layout.foot_view, NULL); 
    Footer.measure (0, 0); 
    Footerviewheight = Footer.getmeasuredheight (); 
    Footer.setpadding (0,-footerviewheight, 0, 0); 
  This.addfooterview (footer,footer,true); 
    private void Measureview (View child) {Viewgroup.layoutparams P = child.getlayoutparams (); if (p = = null) {p = new Viewgroup.layoutparams (ViewGroup.LayoutParams.MATCH_PARENT, Viewgroup.layoutpar Ams. 
    Wrap_content); 
    int childwidthspec = viewgroup.getchildmeasurespec (0, 0 + 0, p.width); 
    int lpheight = P.height; 
    int childheightspec; if (Lpheight > 0) {childheightspec = Measurespec.makemeasurespec (Lpheight, measurespec.exactly); 
    Is size. else {CHILDHEIGHTSPEC = Measurespec.makemeasurespec (0, measurespec.unspecified);//Gets the actual size of the child layout. 
  } child.measure (Childwidthspec, Childheightspec); } private void toppadding (int toppadding) {header.setpadding (Header.getpaddingleft (), toppadding, header 
    . Getpaddingright (), Header.getpaddingbottom ()); 
  Header.invalidate (); 
        @Override public void onscrollstatechanged (Abslistview abslistview, int i) {if (i = = Scroll_state_idle || i = = scroll_state_fling) {//Determine whether the current has been to the bottom if (isscrolltobottom &&!isloadingmore) {isload 
        Ingmore = true; 
        Current to bottom log.i (TAG, "load more Data"); 
        Footer.setpadding (0, 0, 0, 0); 
        This.setselection (This.getcount ()); 
        if (Onloadlistener!= null) {onloadlistener.onload (); @Override public void Onscroll (Abslistview abslistview, int i, int i1, int i2) {this.fi 
    Rstvisibleitem = i; if (getlastvisiblePosition () = = (i2-1)) {Isscrolltobottom = true; 
    else {isscrolltobottom = false; @Override public boolean ontouchevent (motionevent ev) {switch (ev.getaction ()) {//Case Motion 
        Event.ACTION_DOWN:startY = (int) ev.gety (); 
      Break 
        Case MotionEvent.ACTION_MOVE:int Movey = (int) ev.gety (); 
        Y in Move-y = spacing pressed. 
        int diff = (movey-starty)/2; 
        -Height + spacing of head layout = paddingtop int paddingtop =-headercontentheight + diff; 
        If:-Header layout height > Paddingtop value executes super.ontouchevent (EV);  if (Firstvisibleitem = = 0 &&-headercontentheight < paddingtop) {if (Paddingtop > 0 
            && state = NONE) {//fully displayed. 
            LOG.I (TAG, "release Refresh"); 
            state = PULL; 
          Refreshheaderviewbystate (); else if (Paddingtop < 0 && state = = PULL) {//No full log.i shown (TAG, "Drop-down refresh "); 
            state = NONE; 
          Refreshheaderviewbystate (); 
        }//Dropdown head layout header.setpadding (0, paddingtop, 0, 0); 
      } break; 
          Case MOTIONEVENT.ACTION_UP://Determine whether the current state is to release the refresh or Drop-down refresh if (s = = PULL) {log.i (TAG, "refresh data."); 
          The head layout is set to fully display the state header.setpadding (0, 0, 0, 0); 
          Go to the state = refreshing that is being refreshed; 
          Refreshheaderviewbystate ();  if (Onrefreshlistener!= null) {Onrefreshlistener.onrefresh ();//Calling the consumer's Listener method}} else if (state = NONE) 
        {//Hidden header layout header.setpadding (0,-headercontentheight, 0, 0); 
      } break; 
    Default:break; 
  return super.ontouchevent (EV); }//private void Refreshheaderviewbystate () {switch (state) {//Case NONE://dropdown refresh status Tvstate. 
        SetText ("Drop-down refresh"); Iv_pull.startanimation (DownanimatiON); 
      Perform a downward rotation break; 
        Case PULL://Release Refresh Status Tvstate.settext ("Release Refresh"); Iv_pull.startanimation (upanimation); 
      Perform a spin up break; 
        Case refreshing://is refreshing in the state iv_pull.clearanimation (); 
        Iv_pull.setvisibility (View.gone); 
        Mprogressbar.setvisibility (view.visible); 
        Tvstate.settext ("in refresh ..."); 
      Break 
    Default:break; 
    } public void Hideheaderview () {header.setpadding (0,-headercontentheight, 0, 0); 
    Iv_pull.setvisibility (view.visible); 
    Mprogressbar.setvisibility (View.gone); 
    Tvstate.settext ("Drop-down refresh"); 
    Tvlastupdatetime.settext ("Last Refresh Time:" + getlastupdatetime ()); 
  state = NONE; 
    public void Hidefooterview () {footer.setpadding (0,-footerviewheight, 0, 0); 
  Isloadingmore = false; } public void Setonrefreshlistener (Onrefreshlistener onrefreshlistener) {This.onrefreshlistener = OnRefreshListen 
  Er } public void SetonloadlisteneR (Onloadlistener onloadlistener) {this.onloadlistener = Onloadlistener; 
    public void Onrefresh () {if (Onrefreshlistener!= null) {Onrefreshlistener.onrefresh (); 
    } public void OnLoad () {if (Onloadlistener!= null) {onloadlistener.onload (); 
  } public interface Onrefreshlistener {//Definition dropdown flush interface public void Onrefresh (); 
  } public interface Onloadlistener {//Definition pull load more public void onLoad ();  } 
}

The code above is the key to implementation. The following is the header layout and the foot layout:

Foot_view.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android= 
"http://schemas.android.com/apk" /res/android " 
  android:layout_width=" match_parent " 
  android:layout_height=" wrap_content "> 
  < TextView 
    android:layout_width= "wrap_content" 
    android:layout_height= "Wrap_content" 
    Load more " 
    android:textsize=" 20DP " 
    android:padding=" "10DP" 
    android:layout_centerhorizontal= "true"/> 

Pull_to_refresh_header.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <linearlayout xmlns:android= "http://schemas.android.com/apk/res/" Android "Android:layout_width=" Wrap_content "android:layout_height=" wrap_content "android:orientation=" Horizontal "> <framelayout android:layout_width=" wrap_content "android:layout_height=" Wrap_content "android:l 
      ayout_margin= "10dip" > <imageview android:id= "@+id/iv_pull" android:layout_width= "Wrap_content" android:layout_height= "wrap_content" android:layout_gravity= "center" android:minwidth= "30dip" a ndroid:src= "@mipmap/xlistview_arrow"/> <progressbar android:id= "@+id/pb_listview_header" Android : layout_width= "wrap_content" android:layout_height= "wrap_content" android:layout_gravity= "center" and roid:visibility= "Gone"/> </FrameLayout> <linearlayout android:layout_width= "Fill_parent" Andr oid:layout_height= "Wrap_content" 
    Android:layout_gravity= "center_vertical" android:gravity= "center_horizontal" android:orientation= "vertical" 
      "> <textview android:id=" @+id/tv_listview_header_state "android:layout_width=" Wrap_content " android:layout_height= "Wrap_content" android:text= "Drop-down Refresh" android:textcolor= "#FF0000" android:texts Ize= "18sp"/> <textview android:id= "@+id/tv_listview_header_last_update_time" Android:layout_widt H= "Wrap_content" android:layout_height= "wrap_content" android:layout_margintop= "5dip" android:text= "the most Refresh time: 2014-10-10 12:56:12 "android:textcolor=" @android: Color/black "android:textsize=" 14sp "/> </l  Inearlayout> </LinearLayout>

Activity_main.xml:

<?xml version= "1.0" encoding= "Utf-8"?> <relativelayout xmlns:android= 
"http://schemas.android.com/apk" /res/android " 
  xmlns:tools=" Http://schemas.android.com/tools " 
  android:id=" @+id/activity_main 
  " Android:layout_width= "Match_parent" 
  android:layout_height= "match_parent" 
  android:paddingbottom= "@dimen /activity_vertical_margin " 
  android:paddingleft=" @dimen/activity_horizontal_margin " 
  android: paddingright= "@dimen/activity_horizontal_margin"  android:paddingtop= "@dimen/activity_vertical_margin" tools:context= "Com.example.mic.testdemo.MainActivity" >       <com.example.mic.testdemo.view.autolistview 
        android:id= "@+id/lv" 
        android:layout_width= "match_parent" 
       android:layout_height= "Match_parent" > 
      </com.example.mic.testdemo.view.AutoListView> 

The step above is to load a different layout on the ListView, which is also the code to be reused, the following code is how to use the code.

Mainactivity.java:

public class Mainactivity extends appcompatactivity implements Autolistview.onloadlistener, Autolistview.onrefreshlistener { 
  private TextView TextView; 
  Private String result; 
  Private Autolistview ListView; 
  Private Myadater Adater; 
  @Override 
  protected void onCreate (Bundle savedinstancestate) { 
    super.oncreate (savedinstancestate); 
    Setcontentview (r.layout.activity_main); 
    ListView = (Autolistview) Findviewbyid (r.id.lv);} 
Listview.setonrefreshlistener (mainactivity.this); 
Listview.setonloadlistener (mainactivity.this); 
@Override public 
  void OnLoad () { 
  } 
  @Override 
  

Here is the implementation, where you need to set up listening, as well as the above load and refresh the required operation on it!

The above is a small set to introduce the Android custom ListView layout to achieve pull load drop-down refresh function, I hope to help you, if you have any questions please give me a message, small series will promptly reply to everyone. Here also thank you very much for the cloud Habitat Community website support!