Question

我在从共享首选项中检索微调器值时遇到困难。错误消息是：

java.lang.IndexOutOfBoundsException：索引1无效，大小为1 at java.util.ArrayList.throwIndexOutOfBoundsException（ArrayList.java:255） at java.util.Arrays $ ArrayList.get（Arrays.java:66）在android.widget.ArrayAdapter.getItem（ArrayAdapter.java:337）在android.widget.ArrayAdapter.createViewFromResource（ArrayAdapter.java:390）在android.widget.ArrayAdapter.getView（ArrayAdapter.java:362）在android.widget.Spinner.makeAndAddView（Spinner.java:555）在android.widget.Spinner.layout（Spinner.java:503）在android.widget.Spinner.onLayout（Spinner.java:465）

我有两个微调器，第一个微调器用于STATE，第二个微调器用于REPRESENTATIVES。

无论我选择哪种状态，代表微调器都会填充XML文件中包含的arraylist。

用户选择代表后，按位置保存在sharedPreferences。它还会根据保存的位置检索和设置代表的微调器选择。

现在这里出现了问题：

*有些国家的代表人数很少，有些代表很多，例如加利福尼亚州和阿拉斯加州。

如果我选择加利福尼亚州并选择代表号码5，则第二个微调器的位置值将保存为否。 5。

如果我将状态更改为阿拉斯加，则代表的微调器将尝试检索保存在sharedPreferences上的当前值，但它会崩溃，因为阿拉斯加只有一个代表，其最大值位置为1。

所以，请告诉我该怎么做。我找不到解决方法。我想要做的是每当我选择一个不同的状态时，它刷新或将第二个微调器（代表）选择值更新为默认值0并将新选择的（代表性）微调器值选择保存到sharedPreferences。

这是我的活动代码：



public class Location extends AppCompatActivity {

// Wigets - GUI
Spinner statespinner;
Spinner RepresentativeSpinner;
Button btnsubmit;
TextView Senators_Location;
TextView Capital_Location;
TextView Governor_Location;
TextView txtOrigin;
int arrayId;
ArrayAdapter < CharSequence > Rep_Spinner_Adapter;


@
Override
protected void onCreate(final Bundle savedInstanceState {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_location);

// Initialize Spinners
statespinner = (Spinner) findViewById(R.id.State_spinner);
RepresentativeSpinner = (Spinner) findViewById(R.id.Representatives_spinner);
btnsubmit = (Button) findViewById(R.id.state_county_button);
Capital_Location = (TextView) findViewById(R.id.Capital_Location);
Governor_Location = (TextView) findViewById(R.id.Governor_Location);
Senators_Location = (TextView) findViewById(R.id.Senators_Location);
txtOrigin = (TextView) findViewById(R.id.answer_20);


ArrayAdapter < CharSequence > adapter = ArrayAdapter.createFromResource(this, R.array.State_arrays, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
statespinner.setAdapter(adapter);

SharedPreferences sharedPref = getSharedPreferences("FileName", MODE_PRIVATE);
int State_spinnerValue = sharedPref.getInt("userChoiceState", -1);
if (State_spinnerValue != -1)
      statespinner.setSelection(State_spinnerValue);


statespinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@
Override
public void onItemSelected(AdapterView <? > adapter, View v, int position, long id) {


SharedPreferences sharedPref = getSharedPreferences("FileName", Context.MODE_PRIVATE);
int state_choice = statespinner.getSelectedItemPosition();
String Senate_Selection = adapter.getItemAtPosition(position).toString();
SharedPreferences.Editor prefEditorState = sharedPref.edit();
prefEditorState.putString("Senators_Choice", Senate_Selection);
prefEditorState.putInt("userChoiceState", state_choice);
prefEditorState.apply();

String State_Item = adapter.getItemAtPosition(position).toString();
  
  
if (State_Item.equals("Select A State")) {
Senators_Location.setText(null);
Capital_Location.setText(null);
Governor_Location.setText(null);
arrayId = R.array.Blank_Rep_arrays;}

  
else if (State_Item.equals("Alabama")) {
          Capital_Location.setText(getString(R.string.Alabama_Capital));
          Governor_Location.setText(getString(R.string.Alabama_Governor));
          Senators_Location.setText(getString(R.string.Alabama_Senators));
arrayId = R.array.Alabama_arrays;}

else if (State_Item.equals("Alaska")) {
          Capital_Location.setText(getString(R.string.Alaska_Capital));
          Governor_Location.setText(getString(R.string.Alabama_Governor));
          Senators_Location.setText(getString(R.string.Alaska_Senators));
arrayId = R.array.Alaska_arrays;} 

else if (State_Item.equals("American Samoa")) {
          Capital_Location.setText(getString(R.string.American_Samoa_Capital));
          Governor_Location.setText(getString(R.string.American_Samoa_Governor));
          Senators_Location.setText(getString(R.string.American_Samoa_Senators));
arrayId = R.array.American_Samoa_arrays;}

else if (State_Item.equals("Arizona")) {
          Capital_Location.setText(getString(R.string.Arizona_Capital));
          Governor_Location.setText(getString(R.string.Arizona_Governor));
          Senators_Location.setText(getString(R.string.Arizona_Senators));
arrayId = R.array.Arizona_Representatives_array;}


Rep_Spinner_Adapter =
ArrayAdapter.createFromResource(Location.this, arrayId, android.R.layout.simple_spinner_item);
        Rep_Spinner_Adapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
        RepresentativeSpinner.setAdapter(Rep_Spinner_Adapter);

SharedPreferences sharedPrefRep = getSharedPreferences("FileName", MODE_PRIVATE);
int Rep_spinnerValue = sharedPrefRep.getInt("userChoiceRep", -1);
if (Rep_spinnerValue != -1) RepresentativeSpinner.setSelection(Rep_spinnerValue);


// Showing selected spinner item
Toast.makeText(getApplicationContext(),"Selected State: " + State_Item, Toast.LENGTH_LONG).show();}


@
Override
public void onNothingSelected(AdapterView <? > arg0) {
        // TODO Auto-generated method stub
}
});


RepresentativeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@
Override
public void onItemSelected(AdapterView <? > Rep_adapter, View v, int position, long id) {


SharedPreferences sharedPrefRep = getSharedPreferences("FileName", MODE_PRIVATE);
String representatives_item = Rep_adapter.getItemAtPosition(position).toString();
int Rep_choice = RepresentativeSpinner.getSelectedItemPosition();
SharedPreferences.Editor prefEditorRep = sharedPrefRep.edit();
prefEditorRep.putString("RepSelected", representatives_item);
prefEditorRep.putInt("userChoiceRep", Rep_choice);
prefEditorRep.apply();


Toast.makeText(getApplicationContext(),"Selected Representatives: " + representatives_item, Toast.LENGTH_LONG).show();}

@
Override
public void onNothingSelected(AdapterView <? > arg0) {
        // TODO Auto-generated method stub

}


});

}

public void onDestroy() {

super.onDestroy();
}
}

这是我的数据代表XML文件：

public class Location extends AppCompatActivity {

// Wigets - GUI
Spinner statespinner;
Spinner RepresentativeSpinner;
Button btnsubmit;
TextView Senators_Location;
TextView Capital_Location;
TextView Governor_Location;
TextView txtOrigin;
int arrayId;
ArrayAdapter < CharSequence > Rep_Spinner_Adapter;


@
Override
protected void onCreate(final Bundle savedInstanceState {super.onCreate(savedInstanceState);
setContentView(R.layout.activity_location);

// Initialize Spinners
statespinner = (Spinner) findViewById(R.id.State_spinner);
RepresentativeSpinner = (Spinner) findViewById(R.id.Representatives_spinner);
btnsubmit = (Button) findViewById(R.id.state_county_button);
Capital_Location = (TextView) findViewById(R.id.Capital_Location);
Governor_Location = (TextView) findViewById(R.id.Governor_Location);
Senators_Location = (TextView) findViewById(R.id.Senators_Location);
txtOrigin = (TextView) findViewById(R.id.answer_20);


ArrayAdapter < CharSequence > adapter = ArrayAdapter.createFromResource(this, R.array.State_arrays, android.R.layout.simple_spinner_item);
    adapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
statespinner.setAdapter(adapter);

SharedPreferences sharedPref = getSharedPreferences("FileName", MODE_PRIVATE);
int State_spinnerValue = sharedPref.getInt("userChoiceState", -1);
if (State_spinnerValue != -1)
      statespinner.setSelection(State_spinnerValue);


statespinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@
Override
public void onItemSelected(AdapterView <? > adapter, View v, int position, long id) {


SharedPreferences sharedPref = getSharedPreferences("FileName", Context.MODE_PRIVATE);
int state_choice = statespinner.getSelectedItemPosition();
String Senate_Selection = adapter.getItemAtPosition(position).toString();
SharedPreferences.Editor prefEditorState = sharedPref.edit();
prefEditorState.putString("Senators_Choice", Senate_Selection);
prefEditorState.putInt("userChoiceState", state_choice);
prefEditorState.apply();

String State_Item = adapter.getItemAtPosition(position).toString();
  
  
if (State_Item.equals("Select A State")) {
Senators_Location.setText(null);
Capital_Location.setText(null);
Governor_Location.setText(null);
arrayId = R.array.Blank_Rep_arrays;}

  
else if (State_Item.equals("Alabama")) {
          Capital_Location.setText(getString(R.string.Alabama_Capital));
          Governor_Location.setText(getString(R.string.Alabama_Governor));
          Senators_Location.setText(getString(R.string.Alabama_Senators));
arrayId = R.array.Alabama_arrays;}

else if (State_Item.equals("Alaska")) {
          Capital_Location.setText(getString(R.string.Alaska_Capital));
          Governor_Location.setText(getString(R.string.Alabama_Governor));
          Senators_Location.setText(getString(R.string.Alaska_Senators));
arrayId = R.array.Alaska_arrays;} 

else if (State_Item.equals("American Samoa")) {
          Capital_Location.setText(getString(R.string.American_Samoa_Capital));
          Governor_Location.setText(getString(R.string.American_Samoa_Governor));
          Senators_Location.setText(getString(R.string.American_Samoa_Senators));
arrayId = R.array.American_Samoa_arrays;}

else if (State_Item.equals("Arizona")) {
          Capital_Location.setText(getString(R.string.Arizona_Capital));
          Governor_Location.setText(getString(R.string.Arizona_Governor));
          Senators_Location.setText(getString(R.string.Arizona_Senators));
arrayId = R.array.Arizona_Representatives_array;}


Rep_Spinner_Adapter =
ArrayAdapter.createFromResource(Location.this, arrayId, android.R.layout.simple_spinner_item);
        Rep_Spinner_Adapter.setDropDownViewResource(android.R.layout.simple_list_item_1);
        RepresentativeSpinner.setAdapter(Rep_Spinner_Adapter);

SharedPreferences sharedPrefRep = getSharedPreferences("FileName", MODE_PRIVATE);
int Rep_spinnerValue = sharedPrefRep.getInt("userChoiceRep", -1);
if (Rep_spinnerValue != -1) RepresentativeSpinner.setSelection(Rep_spinnerValue);


// Showing selected spinner item
Toast.makeText(getApplicationContext(),"Selected State: " + State_Item, Toast.LENGTH_LONG).show();}


@
Override
public void onNothingSelected(AdapterView <? > arg0) {
        // TODO Auto-generated method stub
}
});


RepresentativeSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {

@
Override
public void onItemSelected(AdapterView <? > Rep_adapter, View v, int position, long id) {


SharedPreferences sharedPrefRep = getSharedPreferences("FileName", MODE_PRIVATE);
String representatives_item = Rep_adapter.getItemAtPosition(position).toString();
int Rep_choice = RepresentativeSpinner.getSelectedItemPosition();
SharedPreferences.Editor prefEditorRep = sharedPrefRep.edit();
prefEditorRep.putString("RepSelected", representatives_item);
prefEditorRep.putInt("userChoiceRep", Rep_choice);
prefEditorRep.apply();


Toast.makeText(getApplicationContext(),"Selected Representatives: " + representatives_item, Toast.LENGTH_LONG).show();}

@
Override
public void onNothingSelected(AdapterView <? > arg0) {
        // TODO Auto-generated method stub

}


});

}

public void onDestroy() {

super.onDestroy();
}
}

使用共享首选项中的多个数组从Spinner上检索值

0 个答案: