停止：
私は何をしたいです
私は、ユーザーが依存スピナー上で選択したデータを取得したいと思います。
私の現在のコードでは、それが最初のスピナーからデータを取得することに成功しましたが、私は2番目のスピナーからそれを行うことはできません。
問題
どのように私は、ユーザーの選択の適切なデータを取得するために自分のコードを修正する必要がありますか？
- この場合、第2 TextViewにはBMWでなければなりませんが、それは第二スピナの第一候補であるアウディ、です。
- 最初のTextViewは、ユーザーの選択に続いて変更されます。この場合には、モータからの移動に変化するが、再度、第二のTextViewは、第スピナーの最初の第一候補として残りました。
現在のコード
MainActivity.kt
package com.example.spinner
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.app.Activity
import android.content.Intent
import android.util.Log
import android.view.View
import android.widget.AdapterView
import android.widget.Spinner
import android.widget.ArrayAdapter
import kotlinx.android.synthetic.main.activity_main.*
import android.widget.AdapterView.OnItemSelectedListener
import android.widget.Toast
class MainActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener {
var spinner1: Spinner? = null
var spinner2: Spinner? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
spinner1 = findViewById(R.id.spinner1) as Spinner
spinner2 = findViewById(R.id.spinner2) as Spinner
val adapter1 = ArrayAdapter.createFromResource(
this,
R.array.array1, android.R.layout.simple_spinner_item
)
spinner1?.setAdapter(adapter1)
spinner1?.setOnItemSelectedListener(this)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the main; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
val id = item.getItemId()
return if (id == R.id.action_settings) {
true
} else super.onOptionsItemSelected(item)
}
override fun onItemSelected(
parent: AdapterView<*>, view: View, position: Int,
id: Long
) {
if (spinner1?.getSelectedItem() == "mobile") {
Toast.makeText(
applicationContext, "Mobil dipilih",
Toast.LENGTH_SHORT
).show()
val adapter2 = ArrayAdapter.createFromResource(
this,
R.array.mobile_array, android.R.layout.simple_spinner_item
)
spinner2?.setAdapter(adapter2)
spinner2?.setOnItemSelectedListener(this)
} else {
val adapter2 = ArrayAdapter.createFromResource(
this,
R.array.motor_array, android.R.layout.simple_spinner_item
)
spinner2?.setAdapter(adapter2)
spinner2?.setOnItemSelectedListener(this)
}
// here I try to put the selected contents to variables
val spinner1_content = spinner1?.getSelectedItem() as String
textView1.text = spinner1_content
val spinner2_content = spinner2?.getSelectedItem() as String
textView2.text = spinner2_content
}
override fun onNothingSelected(parent: AdapterView<*>?) {
}
}
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: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.stackspinner.MainActivity" >
<Spinner
android:id="@+id/spinner1"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Spinner
android:id="@+id/spinner2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/spinner1" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#00f"
android:layout_marginTop="100dp"
android:textSize="40sp" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textColor="#00f"
android:layout_marginTop="100dp"
android:textSize="40sp" />
</LinearLayout>
</RelativeLayout>
strings.xml
<resources>
<string name="app_name">Application Name</string>
<string name="hello_world">Hello world!</string>
<string name="action_settings">Settings</string>
<string-array name="array1">
<item>mobile</item>
<item>motor</item>
</string-array>
<string-array name="mobile_array">
<item>Android</item>
<item>blackberry</item>
<item>apple</item>
</string-array>
<string-array name="motor_array">
<item>Audi</item>
<item>BMW</item>
<item>unicorn</item>
</string-array>
</resources>
答えを聞いた後、現在のコード
MainActivity.kt
package com.example.spinner
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.Menu
import android.view.MenuItem
import android.app.Activity
import android.content.Intent
import android.util.Log
import android.view.View
import android.widget.AdapterView
import android.widget.Spinner
import android.widget.ArrayAdapter
import kotlinx.android.synthetic.main.activity_main.*
import android.widget.AdapterView.OnItemSelectedListener
import android.widget.Toast
class MainActivity : AppCompatActivity(), AdapterView.OnItemSelectedListener {
var spinner1: Spinner? = null
var spinner2: Spinner? = null
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
spinner1 = findViewById(R.id.spinner1) as Spinner
spinner2 = findViewById(R.id.spinner2) as Spinner
val adapter1 = ArrayAdapter.createFromResource(
this,
R.array.array1, android.R.layout.simple_spinner_item
)
spinner1?.setAdapter(adapter1)
spinner1?.setOnItemSelectedListener(this)
val adapter2 = ArrayAdapter.createFromResource(
this,
R.array.array1, android.R.layout.simple_spinner_item
)
spinner2?.setAdapter(adapter2)
spinner2?.setOnItemSelectedListener(this)
}
override fun onCreateOptionsMenu(menu: Menu): Boolean {
// Inflate the main; this adds items to the action bar if it is present.
menuInflater.inflate(R.menu.main, menu)
return true
}
override fun onOptionsItemSelected(item: MenuItem): Boolean {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
val id = item.getItemId()
return if (id == R.id.action_settings) {
true
} else super.onOptionsItemSelected(item)
}
override fun onItemSelected(
parent: AdapterView<*>, view: View, position: Int,
id: Long
) {
if (spinner1?.getSelectedItem() == "mobile") {
Toast.makeText(
applicationContext, "Mobil dipilih",
Toast.LENGTH_SHORT
).show()
val adapter2 = ArrayAdapter.createFromResource(
this,
R.array.mobile_array, android.R.layout.simple_spinner_item
)
spinner2?.setAdapter(adapter2)
} else {
val adapter2 = ArrayAdapter.createFromResource(
this,
R.array.motor_array, android.R.layout.simple_spinner_item
)
spinner2?.setAdapter(adapter2)
}
// here I try to put the selected contents to variables
val spinner1_content = spinner1?.getSelectedItem() as String
textView1.text = spinner1_content
val spinner2_content = spinner2?.getSelectedItem() as String
textView2.text = spinner2_content
}
override fun onNothingSelected(parent: AdapterView<*>?) {
}
}
ローベル：
あなたがモバイル（OAモータ）を選択するたびに、あなたのspinner2を再作成することを注意してください。あなたは、各スピナーに異なるリスナーを使用する必要があります。
spinner1.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onNothingSelected(parent: AdapterView<*>?) {
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
//your spinner1 listener code
}
}
spinner2.dothesame .....
私はよりよい理解のために全体のonCreateを置きます：
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
spinner1 = findViewById(R.id.spinner1) as Spinner
spinner2 = findViewById(R.id.spinner2) as Spinner
textView1 = findViewById(R.id.textView1) as TextView
textView2 = findViewById(R.id.textView2) as TextView
val adapter1 = ArrayAdapter.createFromResource(
this,
R.array.array1, android.R.layout.simple_spinner_item
)
spinner1?.setAdapter(adapter1)
spinner1?.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onNothingSelected(parent: AdapterView<*>?) {
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
var spinner2Adapter: ArrayAdapter<CharSequence>? = null
//select the right adapter for de Spinner2
if (spinner1?.getSelectedItem() == "mobile") {
spinner2Adapter = ArrayAdapter.createFromResource(
applicationContext,
R.array.mobile_array, android.R.layout.simple_spinner_item
)
} else {
spinner2Adapter = ArrayAdapter.createFromResource(
applicationContext,
R.array.motor_array, android.R.layout.simple_spinner_item
)
}
//set the adapter and the listener for spinner2
spinner2?.setAdapter(spinner2Adapter)
spinner2?.onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
override fun onNothingSelected(parent: AdapterView<*>?) {
}
override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
val spinner2_content = spinner2?.getSelectedItem() as String
textView2?.text = spinner2_content
}
}
// here I try to put the selected contents to variables
val spinner1_content = spinner1?.getSelectedItem() as String
textView1?.text = spinner1_content
}
}
}