Implementation of cascading in the menu of android Spinner

As follows:

First load by default

Select the original queue:

Cascade:

Key code: bind Id to the selected event listener in the drop-down list:

Copy codeThe Code is as follows: int pos = firsthand_dlbh_pinner.getSelectedItemPosition ();
Firsthand_pdbh_adapter = new ArrayAdapter <String> (context,
Android. R. layout. simple_spinner_item, queu_info [pos]);
Firsthand_pdbh_spinner.setAdapter (firsthand_pdbh_adapter );

Complete code:

Layout file code:

Copy codeThe Code is as follows: <? Xml version = "1.0" encoding = "UTF-8"?>
<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android"
Android: layout_width = "fill_parent"
Android: layout_height = "fill_parent"
Android: orientation = "vertical">

<TextView
Android: id = "@ + id/firsthand_dlbh"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</TextView>

<Spinner
Android: id = "@ + id/firsthand_dlbh_pinner"
Android: layout_width = "200sp"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</Spinner>

<TextView
Android: id = "@ + id/firsthand_pdbh"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</TextView>

<Spinner
Android: id = "@ + id/firsthand_pdbh_pinner"
Android: layout_width = "200sp"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</Spinner>

<TextView
Android: id = "@ + id/target_dlbh"
Android: layout_width = "fill_parent"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</TextView>

<Spinner
Android: id = "@ + id/target_dlbh_spinner"
Android: layout_width = "200sp"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "60sp"
Android: layout_marginTop = "20sp">
</Spinner>

<Button
Android: id = "@ + id/diff_manage_operation"
Android: layout_width = "wrap_content"
Android: layout_height = "wrap_content"
Android: layout_marginLeft = "100sp"
Android: layout_marginTop = "20sp"
Android: text = "execution scheduling"
Android: textSize = "18sp">
</Button>

</LinearLayout>

JAVA program code:
Copy codeThe Code is as follows: import android. app. Activity;
Import android. content. Context;

Import android. OS. Bundle;

Import android. view. Menu;
Import android. view. View;
Import android. view. View. OnClickListener;
Import android. widget. AdapterView;
Import android. widget. ArrayAdapter;
Import android. widget. Button;
Import android. widget. Spinner;
Import android. widget. TextView;
Import android. widget. AdapterView. OnItemSelectedListener;

Public class ManageInfo_Activity extends Activity implements OnClickListener {
Private Context context;
Private static final String [] queuilist = {"A999", "B888 "};
Private static final String [] default_linfo = {"A01", "A02", "A03", "A04 ",
"A05", "A06", "A07", "A08", "A09", "A10", "A11 "};
Private static final String [] [] queu_info = new String [] [] {
{"A01", "A02", "A03", "A04", "A05", "A06", "A07", "A08", "A09 ",
"A10", "A11 "},
{"B01", "B02", "B03", "B04", "B05", "B06", "B07", "B08", "B09 ",
"B10", "B11 "}};
Private TextView firsthand_dlbh_view;
Private Spinner firsthand_dlbh_pinner;
Private ArrayAdapter <String> firsthand_dlbh_adapter;

Private TextView firsthand_pdbh_view;
Private Spinner firsthand_pdbh_spinner;
Private ArrayAdapter <String> firsthand_pdbh_adapter;

Private TextView target_dlbh_view;
Private Spinner target_dlbh_spinner;
Private ArrayAdapter <String> target_dlbh_adapter;

Private String firsthand_dlbh = "";
Private String firsthand_pdbh = "";
Private String target_dlbh = "";

@ Override
Protected void onCreate (Bundle savedInstanceState ){
// TODO Auto-generated method stub
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_manageinfo );

Context = this;

// Define the original queue number drop-down menu
Firsthand_dlbh_view = (TextView) findViewById (R. id. firsthand_dlbh );
Firsthand_dlbh_pinner = (Spinner) findViewById (R. id. firsthand_dlbh_pinner );
// Connect the available content with the ArrayAdapter
Firsthand_dlbh_adapter = new ArrayAdapter <String> (this,
Android. R. layout. simple_spinner_item, queuilist );
// Set the style of the drop-down list
Firsthand_dlbh_adapter
. SetDropDownViewResource (android. R. layout. simple_spinner_dropdown_item );
// Add the adapter to the spinner
Firsthand_dlbh_pinner.setAdapter (firsthand_dlbh_adapter );
// Add event Spinner event listening
Firsthand_dlbh_pinner
. SetOnItemSelectedListener (new FirsthanddlbhSpinnerSelectedListener ());
// Set the default value
Firsthand_dlbh_pinner.setVisibility (View. VISIBLE );

// Define the drop-down menu of the original queue number
Firsthand_pdbh_view = (TextView) findViewById (R. id. firsthand_pdbh );
Firsthand_pdbh_spinner = (Spinner) findViewById (R. id. firsthand_pdbh_pinner );
// Connect the available content with the ArrayAdapter
Firsthand_pdbh_adapter = new ArrayAdapter <String> (this,
Android. R. layout. simple_spinner_item, default_linfo );
// Set the style of the drop-down list
Firsthand_pdbh_adapter
. SetDropDownViewResource (android. R. layout. simple_spinner_dropdown_item );
// Add the adapter to the spinner
Firsthand_pdbh_spinner.setAdapter (firsthand_pdbh_adapter );
// Add event Spinner event listening
Firsthand_pdbh_spinner
. SetOnItemSelectedListener (new FirsthandpdbhSpinnerSelectedListener ());
// Set the default value
Firsthand_pdbh_spinner.setVisibility (View. VISIBLE );

// Define the drop-down menu of the target queue
Target_dlbh_view = (TextView) findViewById(R.id.tar get_dlbh );
Target_dlbh_spinner = (Spinner) findViewById(R.id.tar get_dlbh_spinner );
// Connect the available content with the ArrayAdapter
Target_dlbh_adapter = new ArrayAdapter <String> (this,
Android. R. layout. simple_spinner_item, queuilist );
// Set the style of the drop-down list
Target_dlbh_adapter
. SetDropDownViewResource (android. R. layout. simple_spinner_dropdown_item );
// Add the adapter to the spinner
Target_dlbh_spinner.setAdapter (target_dlbh_adapter );
// Add event Spinner event listening
Target_dlbh_spinner
. SetOnItemSelectedListener (new TargetdlbhpinnerSelectedListener ());
// Set the default value
Target_dlbh_spinner.setVisibility (View. VISIBLE );

Button diff_manage_operation = (Button) findViewById (R. id. diff_manage_operation );
Diff_manage_operation.setOnClickListener (this );

}

// Select the target queuing number event listener
Class FirsthanddlbhSpinnerSelectedListener implements
OnItemSelectedListener {

Public void onItemSelected (AdapterView <?> Arg0, View arg1, int arg2,
Long arg3 ){
Firsthand_dlbh = queuilist [arg2];
Firsthand_dlbh_view.setText ("select the original queue as follows:" + queuilist [arg2]);
Int pos = firsthand_dlbh_pinner.getSelectedItemPosition ();
Firsthand_pdbh_adapter = new ArrayAdapter <String> (context,
Android. R. layout. simple_spinner_item, queu_info [pos]);
Firsthand_pdbh_spinner.setAdapter (firsthand_pdbh_adapter );

}

Public void onNothingSelected (AdapterView <?> Arg0 ){
}
}

// Select the target queuing number event listener
Class FirsthandpdbhSpinnerSelectedListener implements
OnItemSelectedListener {

Public void onItemSelected (AdapterView <?> Arg0, View arg1, int arg2,
Long arg3 ){
Firsthand_pdbh = (String) firsthand_pdbh_spinner
. GetItemAtPosition (arg2 );
Firsthand_pdbh_view.setText ("the queuing number to be moved is :"
+ (String) firsthand_pdbh_spinner.getItemAtPosition (arg2 ));
}

Public void onNothingSelected (AdapterView <?> Arg0 ){
}
}

/// Select the event listener with reference to the queuing number
Class TargetdlbhpinnerSelectedListener implements OnItemSelectedListener {

Public void onItemSelected (AdapterView <?> Arg0, View arg1, int arg2,
Long arg3 ){
Target_dlbh = queuilist [arg2];
Target_dlbh_view.setText ("move to" + queuilist [arg2] + "queue ");
}

Public void onNothingSelected (AdapterView <?> Arg0 ){
}
}

@ Override
Public void onClick (View v ){

System. out. println ("entering the same queue scheduling stage ");

System. out. println ("Run the queuing number" + firsthand_pdbh + "slave" + firsthand_dlbh
+ "Move the queue to" + target_dlbh + "operation at the end of the queue ");
// DiffMangerQuening (user_name, estination_code, firsthand_dlbh, firsthand_dlbh, target_dlbh); // switch (v. getId () {// the corresponding prompt is displayed based on the button clicked.

}

@ Override
Public boolean onCreateOptionsMenu (Menu menu ){
// Inflate the menu; this adds items to the action bar if it is present.
GetMenuInflater (). inflate (R. menu. activity_main, menu );
Return true;
}
}