Android Custom View implements methods for clicking and double-clicking Events _android

Custom View,

1. Customize a runnable thread toucheventcountthread to count the number of clicks within 500ms

2. Call the above thread in the ontouchevent in MyView

3. Customize a handler, in the Toucheventhandler processing statistics to the Click event, click, double-click, three hits, can be processed

The core code is as follows:

public class MyView extends View {...//statistics 500ms clicks toucheventcountthread mintoucheventcount = new Touchev
  Entcountthread ();

  According to the number of clicks Toucheventcountthread Statistics, perform click or double-click the event Toucheventhandler Mtoucheventhandler = new Toucheventhandler (); @Override public boolean ontouchevent (Motionevent event) {switch (event.getaction ()) {case Motionevent.actio
        N_down:if (0 = = Mintoucheventcount.touchcount)///First press, start statistics postdelayed (Mintoucheventcount, 500);
      Break 
        Case MOTIONEVENT.ACTION_UP://A Click event to have press and lift, have to lift must have pressed, so only need to action_up in the processing mintoucheventcount.touchcount++; If it is a long press operation, then the handler message cannot be touchcount to 0, requiring special handling if (Mintoucheventcount.islongclick) {Mintouchev
          Entcount.touchcount = 0;
        Mintoucheventcount.islongclick = false;
      } break;
      Case MotionEvent.ACTION_MOVE:break;
      Case MotionEvent.ACTION_CANCEL:break; Default:breaK
  Return Super.ontouchevent (event);
    The public class Toucheventcountthread implements Runnable {public int touchcount = 0;

    public Boolean islongclick = false;
      @Override public void Run () {msg = new message ();
      if (0 = touchcount) {//Long click Islongclick = true;
        else {msg.arg1 = Touchcount;
        Mtoucheventhandler.sendmessage (msg);
      Touchcount = 0; }} public class Toucheventhandler extends Handler {@Override public void Handlemessage (msg)
    {Toast.maketext (Mcontext, "touch" + Msg.arg1 + "time.", Toast.length_short). Show (); }
  }

  ......

}

The package will be as follows, so that it can be invoked elsewhere:

public interface ondoubleclicklistener{
    void OnDoubleClick (View v);
  }
  
  Private Ondoubleclicklistener Mondoubleclicklistener;

  public void Setondoubleclicklistener (Myview.ondoubleclicklistener l) {
    mondoubleclicklistener = l;
  }

  public Boolean Performdoubleclick () {
    Boolean result = false;
    if (Mondoubleclicklistener!= null) {
      Mondoubleclicklistener.ondoubleclick (this);
      result = true;
    }
    return result;
  }

  public class Toucheventhandler extends Handler {

    @Override public
    void Handlemessage (msg) {
      if (2 = = Msg.arg1)
        performdoubleclick ();
    }
  

used in activity:

Myview1.setondoubleclicklistener (New Myview.ondoubleclicklistener () {
  @Override public
  void OnDoubleClick ( View v) {
  toast.maketext (Mcontext, double click, Toast.length_short). Show ();
  }
);

All code

Myview.java

Package Com.carloz.test.myapplication.view;
Import Android.content.Context;
Import Android.content.res.TypedArray;
Import Android.graphics.Bitmap;
Import Android.graphics.BitmapFactory;
Import Android.graphics.Canvas;
Import Android.graphics.Paint;
Import Android.os.Handler;
Import Android.os.Message;
Import Android.util.AttributeSet;
Import android.view.MotionEvent;
Import Android.view.View;

Import Android.widget.Toast;

Import COM.CARLOZ.TEST.MYAPPLICATION.R;
 /** * Created by Root on 15-11-9.
  * * public class MyView extends View {private Paint mpaint = new Paint ();
  Private Boolean Mnotdestroy = true;
  private int mcount = 0;
  Private Mythread mythread;
  Bitmap Bitmap;
  Attrs private String Mtext;
  Private Boolean Mstartchange;


  Context Mcontext;
    Public MyView {Super (context);
  Init ();
    Public MyView (context, AttributeSet attrs) {Super (context, attrs); TypedArray ta = context.obtainstyledattributes (attrs, R.styleAble.
    MyView);
    Mtext = ta.getstring (R.styleable.myview_text);
    Mstartchange = Ta.getboolean (R.styleable.myview_startchange, false);
    LOG.D ("Asdf", "mtext=" + Mtext + ", mstartchange=" + mstartchange);

    Ta.recycle ();
  Init ();
  } @Override protected void Onfinishinflate () {super.onfinishinflate (); @Override protected void onmeasure (int widthmeasurespec, int heightmeasurespec) {super.onmeasure (widthmeasures
  PEC, Heightmeasurespec); @Override protected void OnLayout (Boolean changed, int left, int. top, int right, int bottom) {super.onlayout (c
  Hanged, left, top, right, bottom);
    } @Override protected void OnDraw (Canvas Canvas) {Super.ondraw (Canvas);
    Mpaint.settextsize (50);
    Canvas.drawtext (Mtext + mcount++, 20f, 100f, Mpaint);
    Canvas.save ();
    Canvas.rotate (GetWidth ()/2, GetHeight ()/2);
    Canvas.drawbitmap (Bitmap, 20f, 50f, Mpaint);

    Canvas.restore (); if (null = = Mythread) {mythread = new Mythread ();
    Mythread.start ();
  @Override public boolean dispatchtouchevent (Motionevent ev) {return super.dispatchtouchevent (EV);
    } @Override protected void Onattachedtowindow () {Super.onattachedtowindow ();
  Mnotdestroy = true;
    @Override protected void Ondetachedfromwindow () {Mnotdestroy = false;
  Super.ondetachedfromwindow ();
  }//Statistics 500ms clicks toucheventcountthread mintoucheventcount = new Toucheventcountthread ();

  According to the number of clicks Toucheventcountthread Statistics, perform click or double-click the event Toucheventhandler Mtoucheventhandler = new Toucheventhandler (); @Override public boolean ontouchevent (Motionevent event) {switch (event.getaction ()) {case Motionevent.actio
        N_down:if (0 = = Mintoucheventcount.touchcount)///First press, start statistics postdelayed (Mintoucheventcount, 500);
      Break 
        Case MOTIONEVENT.ACTION_UP://A Click event to have press and lift, have to lift must have pressed, so only need to action_up in the processing mintoucheventcount.touchcount++;If it is a long press operation, then the handler message cannot be touchcount to 0, requiring special handling if (Mintoucheventcount.islongclick) {Mintoucheventcount.
          Touchcount = 0;
        Mintoucheventcount.islongclick = false;
      } break;
      Case MotionEvent.ACTION_MOVE:break;
      Case MotionEvent.ACTION_CANCEL:break;
    Default:break;
  Return Super.ontouchevent (event);
    The public class Toucheventcountthread implements Runnable {public int touchcount = 0;

    public Boolean islongclick = false;
      @Override public void Run () {msg = new message ();
      if (0 = touchcount) {//Long click Islongclick = true;
        else {msg.arg1 = Touchcount;
        Mtoucheventhandler.sendmessage (msg);
      Touchcount = 0; }} public class Toucheventhandler extends Handler {@Override public void Handlemessage (msg) {Toast.maketext (Mcontext, "touch" + Msg.arg1 + "time.", Toast.length_short). Show ();
      Class Mythread extends Thread {@Override public void run () {super.run ();
          while (Mnotdestroy) {if (Mstartchange) {postinvalidate ();
          try {thread.sleep (500);
          catch (Interruptedexception e) {e.printstacktrace ();
    '}}} ' public void init () {mcontext = GetContext ();
  Bitmap = Bitmapfactory.decoderesource (Getresources (), r.drawable.ic_launcher);
  } public void SetText (String mtext) {this.mtext = Mtext;
  } public void Setstartchange (Boolean mstartchange) {this.mstartchange = Mstartchange;
  public Boolean Getstartchange () {return this.mstartchange; }
}

Attrs.xml

<?xml version= "1.0" encoding= "Utf-8"?>
<resources>
  <declare-styleable name= "MyView" >
    <attr name= "text" format= "string"/>
    <attr name= "Startchange" format= "boolean"/>
  </ Declare-styleable>

</resources>

The Postdelayed method ultimately relies on the Handler postdelayed method to achieve the following principles

Public Final Boolean postdelayed (Runnable R, long Delaymillis)
  {return
    sendmessagedelayed getpostmessage (R), Delaymillis);
  }

  Public Final Boolean sendmessagedelayed (Message msg, long Delaymillis)
  {
    if (Delaymillis < 0) {
      Delaymillis = 0;
    }
    Return Sendmessageattime (MSG, systemclock.uptimemillis () + delaymillis);

  public boolean sendmessageattime (msg, long Uptimemillis) {
    MessageQueue queue = mqueue;
    if (queue = = null) {
      runtimeexception e = new RuntimeException (This
          + sendmessageattime () called with no Mque UE ");
      LOG.W ("Looper", E.getmessage (), e);
      return false;
    }
    return Enqueuemessage (Queue, MSG, uptimemillis); Then the time sequence is compared in the MessageQueue
  

The above is a small series for everyone to bring the Android custom view implementation Click and double-click the full contents of the event, I hope to help you, a lot of support cloud Habitat Community ~