まず初心者です。私はスピナーを作成する方法の例を見てきました.2番目のスピナーのリストが最初のスピナーに依存し、3番目のスピナーリストが依存している複数のスピナーを作成する方法について、このサイトとインターネットを検索しました2次選考時に。しかし、どこにもチュートリアルや解決策が見つかりません。
これがどのように行われるかについて、誰かが助けてくれませんか（チュートリアルは素晴らしいでしょう:)）
基本的に、Spinner1 のリストは「メーカー」であり、選択時に Spinner2 の「モデル」のリストを生成し、スピナー2 のモデルの選択から Spinner3 の「問題」のリストを生成します。
どんな助けでも素晴らしいでしょう、
ありがとうございます。
それでonItemSelected method you can check your fisrt,second,third spinner value and set as per your requires.
onItemSelectedこれは、イベントを処理することで実行できます。データをデータベースまたは配列に保存でき、選択すると、特定のスピナーで特定の配列にデータを入力できます。
これは私のアプリの1つ（実際には私が今までに書いた最初のアプリ）から直接のものなので、きれいではありませんが機能します
package com.skyesmechanical.OilProductionLogApp;
import android.app.Activity;
import android.app.AlertDialog;
import android.database.Cursor;
import android.database.SQLException;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.Toast;
import java.io.IOException;
public class test extends Activity {
/** Called when the activity is first created. */
public String spinnerPipeLengthText = "";
public String spinnerNaturalGasText = "";
public String spinnerPropaneGasText = "";
public Spinner spinnerPipeLength;
public Spinner spinnerTypeGas;
public Spinner spinnerSupplyPressure;
public static Integer spinnerPipeLengthInt = 0;
public static Integer spinnerTypeGasInt = 0;
public static Integer spinnerPropaneGasInt = 0;
public static Integer spinnerSupplyPressureInt = 0;
public static Integer finalRow = 0;
public boolean supplyPressureVisible = false;
public boolean pipeLengthVisible = false;
static TextView textViewSize15;
static TextView textViewSize19;
static TextView textViewSize25;
static TextView textViewSize31;
static TextView textViewSize37;
static TextView textViewSize46;
static TextView textViewSize62;
static TextView textViewSupplyPressure;
static TextView textViewSelectPipeLength;
public static Integer baseTableRowNumber = 0;
public static Cursor cursorResult;
// these to int's keep a false Toast message from appearing
private int intSpinnerCountGas = 0;
private int intSpinnerCountSupply = 0;
private int intSpinnerCountLength = 0;
private static final int NO_OF_EVENTS_GAS = 1;
private static final int NO_OF_EVENTS_SUPPLY = 1;
private static final int NO_OF_EVENTS_LENGTH = 1;
@Override
public void onCreate (Bundle state) {
super.onCreate(state);
setContentView(R.layout.main);
//check if app just started or is being restored from memory
if (state != null ) {
//app is being restored from memory, not executed from scratch
//initialize the fields to the last used;
supplyPressureVisible = state.getBoolean("supplyPressureVisible");
pipeLengthVisible = state.getBoolean("pipeLengthVisible");
spinnerTypeGasInt = state.getInt("spinnerTypeGasInt");
spinnerSupplyPressureInt = state.getInt("spinnerSupplyPressureInt");
spinnerPipeLengthInt = state.getInt("spinnerPipeLengthInt");
finalRow = state.getInt("finalRow");
Toast.makeText(getApplicationContext(), "savedInstanceState != null", Toast.LENGTH_LONG).show();
} //end if
// call doInBackground
new LoadDataBaseTask().doInBackground();
mainProgram ();
} // end onCreate
// performs database query outside GUI thread
private class LoadDataBaseTask extends AsyncTask<Object, Object, Cursor> {
DataBaseHelper myDbHelper = new DataBaseHelper(CSSTPipeSizingActivity.this);
// perform the database access
@Override
protected Cursor doInBackground (Object... params) {
try {
myDbHelper.createDataBase();
}
catch (IOException ioe) {
throw new Error("Unable to create database");
}
try {
myDbHelper.openDataBase();
}
catch(SQLException sqle) {
throw sqle;
}
return myDbHelper.getData();
} // end method doInBackground
// use the Cursor returned from the doInBackground method
@Override
protected void onPostExecute(Cursor result) {
//myDbHelper.changeCursor(result); // set the adapter's Cursor
myDbHelper.close();
} // end method onPostExecute
} // end class LoadDataBaseTask
public void mainProgram () {
spinnerTypeGas = (Spinner) findViewById(R.id.spinnerTypeGas);
spinnerSupplyPressure = (Spinner) findViewById(R.id.spinnerSupplyPressure);
spinnerPipeLength = (Spinner) findViewById(R.id.spinnerPipeLength);
spinnerSupplyPressure.setVisibility(View.INVISIBLE);
textViewSelectPipeLength.setVisibility(View.INVISIBLE);
spinnerPipeLength.setVisibility(View.INVISIBLE);
if (supplyPressureVisible == true) spinnerSupplyPressure.setVisibility(View.VISIBLE);
else spinnerSupplyPressure.setVisibility(View.INVISIBLE);
if (pipeLengthVisible == true) spinnerPipeLength.setVisibility(View.VISIBLE);
else spinnerPipeLength.setVisibility(View.INVISIBLE);
//Sets up the spinnerTypeGas spinner
ArrayAdapter<CharSequence> adapterTypeGas = ArrayAdapter.createFromResource(
this, R.array.TypeGas, android.R.layout.simple_spinner_item);
adapterTypeGas.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerTypeGas.setAdapter(adapterTypeGas);
//Sets up the spinnerPipeLength spinner
ArrayAdapter<CharSequence> adapterPipeLength = ArrayAdapter.createFromResource(
this, R.array.PipeLength, android.R.layout.simple_spinner_item);
adapterPipeLength.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerPipeLength.setAdapter(adapterPipeLength);
// Listens for changes in the selected item in each spinner
spinnerTypeGas.setOnItemSelectedListener(new GASOnItemSelectedListener());
spinnerSupplyPressure.setOnItemSelectedListener(new SupplyOnItemSelectedListener());
spinnerPipeLength.setOnItemSelectedListener(new MyOnItemSelectedListener());
} // end mainProgram
public void SpinnerNatGas() {
ArrayAdapter<CharSequence> adapterSupplyPressure = ArrayAdapter.createFromResource(
this, R.array.NaturalGas, android.R.layout.simple_spinner_item);
adapterSupplyPressure.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSupplyPressure.setAdapter(adapterSupplyPressure);
adapterSupplyPressure.notifyDataSetChanged();
} // end SpinnerNatGAs ()
public void SpinnerProGas () {
ArrayAdapter<CharSequence> adapterSupplyPressure = ArrayAdapter.createFromResource(
this, R.array.PropaneGas, android.R.layout.simple_spinner_item);
adapterSupplyPressure.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerSupplyPressure.setAdapter(adapterSupplyPressure);
adapterSupplyPressure.notifyDataSetChanged();
} // end SpinnerProGAs ()
public class GASOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// this prevents false firing of Toast messages
if (intSpinnerCountGas < NO_OF_EVENTS_GAS) {
intSpinnerCountGas++;
} // end if
else {
spinnerTypeGasInt = spinnerTypeGas.getSelectedItemPosition();
if(spinnerTypeGasInt == 1) {
//populate spinnerSupplyPressure accordingly
SpinnerNatGas();
} // end if
else if(spinnerTypeGasInt == 2) {
//populate spinnerSupplyPressure accordingly
SpinnerProGas();
} // end else if
if (spinnerTypeGasInt != 0) {
spinnerSupplyPressure.setVisibility(View.VISIBLE);
textViewSupplyPressure.setVisibility(View.VISIBLE);
spinnerSupplyPressure.setSelection(0);
spinnerPipeLength.setSelection(0);
supplyPressureVisible = true;
} // end else if
else {
spinnerSupplyPressure.setVisibility(View.INVISIBLE);
textViewSupplyPressure.setVisibility(View.INVISIBLE);
textViewSelectPipeLength.setVisibility(View.INVISIBLE);
spinnerPipeLength.setVisibility(View.INVISIBLE);
supplyPressureVisible = false;
pipeLengthVisible = false;
}// end else
}// end if for false Toast message at app launch
} // end onItemSelected
public void onNothingSelected(AdapterView<?> arg0) {
// nothing to do
} // end onNothingSelected
} // end class GASOnItemSelectedListener
public class SupplyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
// this prevents false firing of Toast messages
if (intSpinnerCountSupply < NO_OF_EVENTS_SUPPLY) {
intSpinnerCountSupply++;
} // end if
else {
spinnerSupplyPressureInt = spinnerSupplyPressure.getSelectedItemPosition();
if (spinnerSupplyPressureInt != 0) {
textViewSelectPipeLength.setVisibility(View.VISIBLE);
spinnerPipeLength.setVisibility(View.VISIBLE);
pipeLengthVisible = true;
spinnerPipeLength.setSelection(0);
} // end if
else {
textViewSelectPipeLength.setVisibility(View.INVISIBLE);
spinnerPipeLength.setVisibility(View.INVISIBLE);
pipeLengthVisible = false;
} // end else
}// end if for false Toast message at app launch
} // end onItemSelected
public void onNothingSelected(AdapterView<?> arg0) {
// nothing to do
} // end onNothingSelected
} // end class SupplyOnItemSelectedListener
public class MyOnItemSelectedListener implements OnItemSelectedListener {
public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
if (intSpinnerCountLength < NO_OF_EVENTS_LENGTH) {
intSpinnerCountLength++;
} // end if
else {
// This also gives the Row to look in the database for the CFH
baseTableRowNumber = 0;
spinnerPipeLengthInt = spinnerPipeLength.getSelectedItemPosition();
//spinnerPipeLengthText = spinnerPipeLength.getSelectedItem().toString();
// calculates the base table row number and stores it in variable baseTableRowNumber
if (spinnerTypeGasInt == 1) {// Natural Gas is selected
baseTableRowNumber = (spinnerSupplyPressureInt - 1) * 18;
}
else if (spinnerTypeGasInt == 2) { // Propane is selected
baseTableRowNumber = 198 + (spinnerSupplyPressureInt - 1) * 18;
} // end else if
showResults();
} // end else for check if firing at inializing
} // end onItemSelected
public void onNothingSelected(AdapterView<?> arg0) {
// nothing to do
} // end onNothingSelected
} // end class MyOnItemSelectedListener
public void showResults () {
if (CSSTPipeSizingActivity.cursorResult != null) {
finalRow = (baseTableRowNumber + spinnerPipeLengthInt);
if (finalRow < 0) {
finalRow = 0;
}
if (finalRow == 0) {
textViewSize15.setText(String.valueOf("0"));
textViewSize19.setText(String.valueOf("0"));
textViewSize25.setText(String.valueOf("0"));
textViewSize31.setText(String.valueOf("0"));
textViewSize37.setText(String.valueOf("0"));
textViewSize46.setText(String.valueOf("0"));
textViewSize62.setText(String.valueOf("0"));
} // end if
else {
cursorResult.moveToPosition(finalRow);
textViewSize15.setText(String.valueOf(cursorResult.getInt(1)));
textViewSize19.setText(String.valueOf(cursorResult.getInt(2)));
textViewSize25.setText(String.valueOf(cursorResult.getInt(3)));
textViewSize31.setText(String.valueOf(cursorResult.getInt(4)));
textViewSize37.setText(String.valueOf(cursorResult.getInt(5)));
textViewSize46.setText(String.valueOf(cursorResult.getInt(6)));
textViewSize62.setText(String.valueOf(cursorResult.getInt(7)));
} // end else
} // end if
} //end showResults
} // end class CSSTPipeSizingActivity
mainProgram（）メソッドの最初の3行で、3つのスピナーを宣言してから、それらにデータを入力し始めます。ユーザーがspinnerTypeGasから選択肢を選択すると、次のスピナー（spinnerSupplyPressure）が表示されます。次に、ユーザーがそのspinnerSupplyPressureからアイテムを選択すると、3番目のスピナー（spinnerPipeLenght）が表示されます。次に、データベースから取得したデータが表示されます。各スピナーは、string.xmlファイルから配列リストを取得します