Android Spinner error: getOnItemSelectedListener in AdapterView cannot be applied
Android Spinner error: getOnItemSelectedListener in AdapterView cannot be applied
我正在使用一个简单的微调器在整数数组中显示买入值。 Gradle 构建中的错误显示:method getOnItemSelectedListener in class AdapterView<T> cannot be applied to given types
。没有必需的参数,错误原因如下:actual and formal arguments lists differ in length where T is a type-variable: T extends Adapter declared in class AdapterView
。我不确定如何解决出现在 (this)
:
上的错误
spinner.getOnItemSelectedListener(this);
我认为这是正确的做法,因为我告诉微调器 this
activity 负责监听微调器上的事件。
这是我的代码:
import android.app.Activity;
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.Toast;
public class HomeActivity extends Activity implements AdapterView.OnItemSelectedListener{
Spinner spinner;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Get the view from home_activity.xml
setContentView(R.layout.home_activity);
// initialize spinner
spinner = (Spinner) findViewById(R.id.buyInSpinner);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.buy_in, android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.getOnItemSelectedListener(this);
} // end onCreate method
@Override
public void onItemSelected(AdapterView<?> adapterView, View v, int i, long l)
{
TextView myText = (TextView) v;
Toast.makeText(this, "You Selected "+myText.getText(), Toast.LENGTH_SHORT).show();
} // end onItemSelected method
@Override
public void onNothingSelected(AdapterView<?> adapterView)
{
Toast.makeText(this, "You Must Buy-In To Play", Toast.LENGTH_SHORT).show();
} // end onNothingSelected method
} // end HomeActivity class
为什么要get没有变量?
我认为在这种情况下你应该使用 spinner.setOnItemSelectedListener(this);
而不是
我正在使用一个简单的微调器在整数数组中显示买入值。 Gradle 构建中的错误显示:method getOnItemSelectedListener in class AdapterView<T> cannot be applied to given types
。没有必需的参数,错误原因如下:actual and formal arguments lists differ in length where T is a type-variable: T extends Adapter declared in class AdapterView
。我不确定如何解决出现在 (this)
:
spinner.getOnItemSelectedListener(this);
我认为这是正确的做法,因为我告诉微调器 this
activity 负责监听微调器上的事件。
这是我的代码:
import android.app.Activity;
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.Toast;
public class HomeActivity extends Activity implements AdapterView.OnItemSelectedListener{
Spinner spinner;
@Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
// Get the view from home_activity.xml
setContentView(R.layout.home_activity);
// initialize spinner
spinner = (Spinner) findViewById(R.id.buyInSpinner);
ArrayAdapter adapter = ArrayAdapter.createFromResource(this, R.array.buy_in, android.R.layout.simple_spinner_item);
spinner.setAdapter(adapter);
spinner.getOnItemSelectedListener(this);
} // end onCreate method
@Override
public void onItemSelected(AdapterView<?> adapterView, View v, int i, long l)
{
TextView myText = (TextView) v;
Toast.makeText(this, "You Selected "+myText.getText(), Toast.LENGTH_SHORT).show();
} // end onItemSelected method
@Override
public void onNothingSelected(AdapterView<?> adapterView)
{
Toast.makeText(this, "You Must Buy-In To Play", Toast.LENGTH_SHORT).show();
} // end onNothingSelected method
} // end HomeActivity class
为什么要get没有变量?
我认为在这种情况下你应该使用 spinner.setOnItemSelectedListener(this);
而不是