Java 如何在微调器setOnItemSelectedListener类中使用If-Else条件?
这里需要帮助!我有一个微调器,它决定用户是男性还是女性。我希望计算bmr。如果使用者是男性,bmr公式与女性不同。因此,我试图创建一个textview,它将显示微调器项的字符串内容,因为无法在onItemSelected方法中访问变量 这就是为什么我在第二部分中使用if-else语句来比较文本和字符串,并希望将bmr传递到另一个活动中,但这不起作用,因为默认情况下我得到了错误的值Java 如何在微调器setOnItemSelectedListener类中使用If-Else条件?,java,android,Java,Android,这里需要帮助!我有一个微调器,它决定用户是男性还是女性。我希望计算bmr。如果使用者是男性,bmr公式与女性不同。因此,我试图创建一个textview,它将显示微调器项的字符串内容,因为无法在onItemSelected方法中访问变量 这就是为什么我在第二部分中使用if-else语句来比较文本和字符串,并希望将bmr传递到另一个活动中,但这不起作用,因为默认情况下我得到了错误的值 spGender = (Spinner) findViewById(R.id.spinnerGender);
spGender = (Spinner) findViewById(R.id.spinnerGender);
final TextView tvGender = (TextView)findViewById(R.id.tvGenderTemp);
spGender.setSelection(0);
spGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
tvGender.setText(item);
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
AlertDialog alertDialog = new AlertDialog.Builder(UserProfile.this).create();
alertDialog.setTitle("Alert");
alertDialog.setMessage("Please select a gender!");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
spGender.setSelection(0);
}
});
//BMR FORMULA PART II
final double bmr;
if ("Female".equals(tvGender.getText().toString()))
{
bmr = (655 + (13.7*userWeight) + (5.0*userHeight) - (6.8*userAge));
}
else
{
bmr = 66 + (13.7 * userWeight) + (1.8*userHeight) - (4.7*userAge);
}
Button btnUPSave = (Button)findViewById(R.id.btnUserProfileSave);
btnUPSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Saved!",
Toast.LENGTH_LONG).show();
Intent in2 = new Intent(getApplicationContext(), CaloriesPage.class);
in2.putExtra("mBMR",bmr);
startActivity(in2);
}
});
spGender=(Spinner)findViewById(R.id.spinnerGender);
最终文本视图tvGender=(文本视图)findViewById(R.id.tvGenderTemp);
SPG.1选举(0);
spGender.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
String item=parent.getItemAtPosition(position.toString();
tvGender.setText(项目);
}
@凌驾
未选择公共无效(AdapterView父级){
AlertDialog AlertDialog=新建AlertDialog.Builder(UserProfile.this).create();
alertDialog.setTitle(“警报”);
alertDialog.setMessage(“请选择性别!”);
alertDialog.setButton(alertDialog.BUTTON_中性,“确定”,新的DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
dialog.dismise();
}
});
alertDialog.show();
SPG.1选举(0);
}
});
//BMR公式第二部分
最终双bmr;
if(“Female”.equals(tvGender.getText().toString()))
{
bmr=(655+(13.7*用户体重)+(5.0*用户身高)-(6.8*用户年龄));
}
其他的
{
bmr=66+(13.7*用户体重)+(1.8*用户身高)-(4.7*用户年龄);
}
按钮btnUPSave=(按钮)findViewById(R.id.btnUserProfileSave);
btnUPSave.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
Toast.makeText(getApplicationContext(),“已保存!”,
Toast.LENGTH_LONG).show();
Intent in2=新的Intent(getApplicationContext(),CaloriesPage.class);
in2.putExtra(“mBMR”,bmr);
星触觉(in2);
}
});
直接从微调器获取所选项目并进行比较
spGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
if ("Female".equals(spGender.getSelectedItem().toString())){
bmr = (655 + (13.7*userWeight) + (5.0*userHeight) - (6.8*userAge));
}else{
bmr = 66 + (13.7 * userWeight) + (1.8*userHeight) - (4.7*userAge);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
spGender.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
if(“Female”.equals(spGender.getSelectedItem().toString())){
bmr=(655+(13.7*用户体重)+(5.0*用户身高)-(6.8*用户年龄));
}否则{
bmr=66+(13.7*用户体重)+(1.8*用户身高)-(4.7*用户年龄);
}
}
@凌驾
未选择公共无效(AdapterView父级){
}
});
public void已选择(AdapterView父项、视图、int位置、长id){
String item=parent.getItemAtPosition(position.toString();
tvGender.setText(项目);
如果(项目等于(“女性”)){
bmr=(655+(13.7*用户体重)+(5.0*用户身高)-(6.8*用户年龄));
}否则{
bmr=66+(13.7*用户体重)+(1.8*用户身高)-(4.7*用户年龄);
}
}
试试这个,希望能奏效
Spinner spGender;
double bmr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
List<String> spinnerArray = new ArrayList<>();
spinnerArray.add("male");
spinnerArray.add("female");
spGender = (Spinner) findViewById(R.id.spinnerGender);
ArrayAdapter arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, spinnerArray);
spGender.setAdapter(arrayAdapter);
final TextView tvGender = (TextView) findViewById(R.id.tvGenderTemp);
spGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
tvGender.setText(item);
//BMR FORMULA PART II
double userWeight = 10;
double userHeight = 20;
double userAge = 35;
if (spGender.getSelectedItem().equals("female"))
{
bmr = (655 + (13.7 * userWeight) + (5.0 * userHeight) - (6.8 * userAge));
} else {
bmr = 66 + (13.7 * userWeight) + (1.8 * userHeight) - (4.7 * userAge);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Alert");
alertDialog.setMessage("Please select a gender!");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}
});
Button btnUPSave = (Button) findViewById(R.id.btnUserProfileSave);
btnUPSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Saved!",
Toast.LENGTH_LONG).show();
Intent in2 = new Intent(getApplicationContext(), Main2Activity.class);
in2.putExtra("mBMR", bmr);
startActivity(in2);
}
});
}
Spinner;
双bmr;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar Toolbar=(Toolbar)findViewById(R.id.Toolbar);
设置支持操作栏(工具栏);
List spinnerray=new ArrayList();
添加(“男性”);
添加(“女性”);
spGender=(Spinner)findViewById(R.id.spinnerGender);
ArrayAdapter ArrayAdapter=新的ArrayAdapter(这个,android.R.layout.simple\u微调器\u项,SpinneArray);
设置适配器(arrayAdapter);
最终文本视图tvGender=(文本视图)findViewById(R.id.tvGenderTemp);
spGender.setOnItemSelectedListener(新的AdapterView.OnItemSelectedListener(){
@凌驾
已选择公共视图(AdapterView父视图、视图视图、整型位置、长id){
String item=parent.getItemAtPosition(position.toString();
tvGender.setText(项目);
//BMR公式第二部分
双倍用户重量=10;
双用户高度=20;
双用户年龄=35岁;
if(spGender.getSelectedItem().equals(“女性”))
{
bmr=(655+(13.7*用户体重)+(5.0*用户身高)-(6.8*用户年龄));
}否则{
bmr=66+(13.7*用户体重)+(1.8*用户身高)-(4.7*用户年龄);
}
}
@凌驾
未选择公共无效(AdapterView父级){
AlertDialog AlertDialog=新建AlertDialog.Builder(MainActivity.this.create();
alertDialog.setTitle(“警报”);
alertDialog.setMessage(“请选择性别!”);
alertDialog.setButton(alertDialog.BUTTON_中性,“确定”,新的DialogInterface.OnClickListener(){
@凌驾
public void onClick(DialogInterface dialog,int which){
dialog.dismise();
}
});
alertDialog.show();
}
});
按钮btnUPSave=(按钮)findViewById(R.id.btnUserProfileSave);
btnUPSave.setOnClickListener(新视图.OnClickListener(){
@凌驾
公共void onClick(视图v){
Spinner spGender;
double bmr;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
List<String> spinnerArray = new ArrayList<>();
spinnerArray.add("male");
spinnerArray.add("female");
spGender = (Spinner) findViewById(R.id.spinnerGender);
ArrayAdapter arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_item, spinnerArray);
spGender.setAdapter(arrayAdapter);
final TextView tvGender = (TextView) findViewById(R.id.tvGenderTemp);
spGender.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
String item = parent.getItemAtPosition(position).toString();
tvGender.setText(item);
//BMR FORMULA PART II
double userWeight = 10;
double userHeight = 20;
double userAge = 35;
if (spGender.getSelectedItem().equals("female"))
{
bmr = (655 + (13.7 * userWeight) + (5.0 * userHeight) - (6.8 * userAge));
} else {
bmr = 66 + (13.7 * userWeight) + (1.8 * userHeight) - (4.7 * userAge);
}
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
alertDialog.setTitle("Alert");
alertDialog.setMessage("Please select a gender!");
alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "OK", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
alertDialog.show();
}
});
Button btnUPSave = (Button) findViewById(R.id.btnUserProfileSave);
btnUPSave.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), "Saved!",
Toast.LENGTH_LONG).show();
Intent in2 = new Intent(getApplicationContext(), Main2Activity.class);
in2.putExtra("mBMR", bmr);
startActivity(in2);
}
});
}