Android to realize Taobao shopping cart increase and reduce the number of merchandise function Demo sample _android

This article illustrates the Android implementation of the Taobao shopping cart to increase and reduce the number of merchandise functions. Share to everyone for your reference, specific as follows:

In a previous example of Android's imitation Taobao shopping cart demo, small part of the simple introduction of how to use ListView to implement the shopping cart, but simply to achieve the function of the list, along with a new problem, when buying goods, we may not only want to buy a product, want to buy multiple , maybe it's something wrong for some reason, originally wanted to buy a, small hands accidentally shook a bit, the number of wrong points into three, this time involves a new function, that is, to increase and reduce the number of goods, today this blog, small knitting to and small partners to share, How to achieve Taobao shopping cart to increase and reduce the number of products demo.

First, we'll lay out the XML file, as shown in the following code:

<relativelayout xmlns:android= "http://schemas.android.com/apk/res/android" xmlns:tools= "http:// Schemas.android.com/tools "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= ". 
    Mainactivity "> <!--overall layout, including the symbols for increasing and reducing the number of items and the number of commodities--> <linearlayout android:layout_width=" Fill_parent " android:layout_height= "wrap_content" android:orientation= "Horizontal" > <!--reduce the layout of the number of items--> <bu
      Tton android:id= "@+id/addbt" android:layout_width= "wrap_content" android:layout_height= "Wrap_content" 
      Android:textcolor= "#0157D3" android:text= "-" > </Button> <!--The layout of the quantity of merchandise--> <edittext Android:id= "@+id/edt" android:text= "0" aNdroid:layout_width= "Wrap_content" android:layout_height= "wrap_content" > </EditText> <!--increase the number of goods The layout--> <button android:id= "@+id/subbt" android:layout_width= "Wrap_content" Android:layout_hei ght= "Wrap_content" android:textcolor= "#0157D3" android:text= "+" > </Button> <!--display the layout of the quantity of goods --> <textview android:id= "@+id/ttt" android:layout_width= "Wrap_content" android:layout_height=

 "Wrap_content" > </TextView> </LinearLayout> </RelativeLayout>

Let's take a look at what the page of the XML layout will look like NIE, as shown in the following illustration:

Next, we'll write the code inside the Java class, as shown in the following code:

Package jczb.shoping.ui; Import Android.
r.string;
Import android.app.Activity;
Import Android.os.Bundle;
Import android.text.Editable;
Import Android.text.TextWatcher;
Import Android.view.View;
Import Android.view.View.OnClickListener;
Import Android.widget.Button;
Import Android.widget.EditText;
Import Android.widget.Toast;
  public class Shoppingcartitemactivity extends activity {private Button btadd, btreduce;
  Private EditText Edtnumber; int num=0;
    Quantity protected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);
    Setcontentview (R.layout.activity_shoppingcart_item);
    Btadd= (Button) Findviewbyid (r.id.cart_pro_reduce);
    Btreduce= (Button) Findviewbyid (R.id.cart_pro_add);
    Edtnumber= (EditText) Findviewbyid (R.id.cart_pro_count);
    Btadd.settag ("+");
    Btreduce.settag ("-");
    Set the input type to digital edtnumber.setinputtype (Android.text.InputType.TYPE_CLASS_NUMBER);
    Edtnumber.settext (string.valueof (num));
  Setviewlistener ();
}
  /**   * Set text change related listening event/private void Setviewlistener () {Btadd.setonclicklistener (New Onbuttonclicklistener ());
    Btreduce.setonclicklistener (New Onbuttonclicklistener ());
  Edtnumber.addtextchangedlistener (New Ontextchangelistener ()); /** * Add and Subtract button event listener * */class Onbuttonclicklistener implements Onclicklistener {@Override Publ
      IC void OnClick (View v) {String numstring = Edtnumber.gettext (). toString ();
        if (numstring = null | | numstring.equals ("")) {num = 0;
      Edtnumber.settext ("0");
            else {if (V.gettag (). Equals ("-")) {if (++num < 0)//First add, then judge {
            num--;
          Toast.maketext (Shoppingcartitemactivity.this, "Please enter a number greater than 0", Toast.length_short). Show ();
          else {edtnumber.settext (string.valueof (num)); } else if (V.gettag (). Equals ("+")) {if (--num < 0)//minus First,Judge again {num++;
          Toast.maketext (Shoppingcartitemactivity.this, "Please enter a number greater than 0", Toast.length_short). Show ();
          else {edtnumber.settext (string.valueof (num));
    /** * EditText Input Change Event listener */class Ontextchangelistener implements Textwatcher {
      @Override public void aftertextchanged (Editable s) {String numstring = s.tostring ();
      if (numstring = null | | numstring.equals ("")) {num = 0;
        else {int numint = Integer.parseint (numstring); if (Numint < 0) {Toast.maketext (shoppingcartitemactivity.this, please enter a number greater than 0), Toast.le
        Ngth_short). Show (); else {//set EDITTEXT cursor position to text end Edtnumber.setselection (Edtnumber.gettext (). toString (). Length ()
          );
        num = Numint; @Override public void beforetextchanged (CharSequence s, int start, int count, int after) {} @Override public void ontextchanged (Charsequence s

 , int start, int before, int count) {}}

Finally, let's look at the effects of the operation, as shown in the following illustration:

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I hope this article will help you with the Android program.