如何解决动态多个微调器“ setOnItemSelectedListener”不适用于项目单击-Android
我正在循环中使用ViewGroup动态创建多个Spinner，但我成功完成了，但是当我从微调器中选择一个项目时，setOnItemSelectedListener()不会在选择的项目上调用。而是在微调器创建并填充值之后的第一次调用。
我认为Spinner的实例在创建后就被破坏了，或者我使用了错误的监听器。
在这里您可以看到我的相对代码：
List<SpinnerItem> arrSpinnerItem;
List<AppCompatSpinner> arrSpinners = new ArrayList<>();
// here is the function
//outer loop to create spinners
for (int i = 0; i < 2; i++) {
LinearLayout newView = (LinearLayout) getLayoutInflater().inflate(R.layout.view_linear_layout,null);
newView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT));
AppCompatSpinner spinner = newView.findViewById(R.id.view_spinner);
// AppCompatSpinner spinner = new AppCompatSpinner(context);
spinner.setTag(i);
arrSpinners.add(spinner); //adding instance for the listener
//inner loop to add items to the created spinner
arrSpinnerItem = new ArrayList<>();
for (int j = 0; j < 2; j++) {
arrSpinnerItem.add(new SpinnerItem("id","name"));
}
//spinner adapter
if (arrSpinnerItem.size() > 0)
spinner.setAdapter(new SpinnerItemAdapter(context,R.layout.item_spinner,arrSpinnerItem));
layout_viewContainer.addView(newView);
}
//listener for all creating spinners
for (AppCompatSpinner compatSpinner : arrSpinners)
compatSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView,View view,int position,long l) { //=> ERROR: doesn't invoke on item click
Log.e(TAG,"callback: " + arrSpinners.get(position).getSelectedItem());
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});0
activity_main.xml
<LinearLayout
android:id="@+id/addSale2Act_layout_viewContainer"
android:padding="@dimen/_10sdp"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
</LinearLayout>
SpinnerItem.java
public class SpinnerItem {
private String id,name;
public SpinnerItem(String id,String name) {
this.id = id;
this.name = name;
}
public String getId() {
return id;
}
public String getName() {
return name;
}
@Override
public String toString() {
return name;
}
}
view_linear_layout.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout android:layout_marginTop="@dimen/_20sdp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="@drawable/shape_rec_spinner"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.AppCompatImageView
android:layout_width="@dimen/_18sdp"
android:layout_height="@dimen/_18sdp"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:layout_marginEnd="@dimen/_10sdp"
android:paddingTop="@dimen/_4sdp"
app:srcCompat="@drawable/ic_arrow_down" />
<androidx.appcompat.widget.AppCompatSpinner
android:id="@+id/view_spinner"
style="@style/RippleEffect"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_centerVertical="true"
android:layout_gravity="center"
android:background="@android:color/transparent"
android:gravity="center"
android:spinnerMode="dropdown" />
</RelativeLayout>
</LinearLayout>
解决方法
解决方案：
创建 arrays.xml，使所有spinner itemlist都在应用程序中---> res --->布局
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="myarray">
<item>Itemname1</item>
<item>Itemname2</item>
<item>Itemname3</item>
<item>Itemname4</item>
<item>Itemname5</item>
</string-array>
</resources>
然后编辑 MainActivity
public class MainActivity extends AppCompatActivity {
private static final String TAG ="" ;
private ArrayAdapter<String> SpinnerAdapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<SpinnerItem> arrSpinnerItem;
final List<AppCompatSpinner> arrSpinners = new ArrayList<>();
ViewGroup layout_viewContainer = (ViewGroup) findViewById(R.id.addSale2Act_layout_viewContainer);
for (int i = 0; i < 2; i++) {
LinearLayout newView = (LinearLayout) getLayoutInflater().inflate(R.layout.view_linear_layout,null);
newView.setLayoutParams(new LinearLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT));
AppCompatSpinner spinner = newView.findViewById(R.id.view_spinner);
SpinnerAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,getResources()
.getStringArray(R.array.myarray));
SpinnerAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(SpinnerAdapter);
spinner.setTag(i);
arrSpinners.add(spinner); //adding instance for the listener
//inner loop to add items to the created spinner
arrSpinnerItem = new ArrayList<>();
for (int j = 0; j < 2; j++) {
arrSpinnerItem.add(new SpinnerItem( "name"));
}
if (arrSpinnerItem.size() > 0)
{
try {
addSpinnerListener(spinner);
}
catch(Exception e)
{
Toast.makeText(getApplicationContext(),""+e,Toast.LENGTH_LONG ).show();
}
}
// spinner.setAdapter(new ArrayAdapter(this,arrSpinnerItem));
layout_viewContainer.addView(newView);
}
}
private void addSpinnerListener(final Spinner curspinner) {
curspinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView,View view,int position,long l) {
((TextView) adapterView.getChildAt(0)).setTextColor(Color.BLACK);
String strselected = curspinner.getSelectedItem().toString();
int spinnerPosition = SpinnerAdapter.getPosition(strselected);
curspinner.setSelection(spinnerPosition);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
}
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