如何解决如何在微调框下拉菜单上打开新活动,请单击
如果有人可以帮助您。 我已经创建了微调器部件,但是现在每当我单击下拉列表时,都需要打开一个新活动。我在需要将if else / switch情况放入微调框的地方感到困惑。
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
spinner = findViewById(R.id.spinner);
flags = findViewById(R.id.flag);
spinner.setAdapter(new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,CountryData.countryNames));
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView,View view,int i,long l) {
flags.setImageResource(CountryData.countryflag[spinner.getSelectedItemPosition()]);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
解决方法
我认为您可以这样做:
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import androidx.appcompat.app.AppCompatActivity;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity
{
Spinner spinner;
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<String> activityList = new ArrayList<>(); // list of string which will be added to Spinner
activityList.add("Select Activity");
activityList.add("Activity 1");
activityList.add("Activity 2");
spinner = findViewById(R.id.spinner);
spinner.setAdapter(new ArrayAdapter<>(this,android.R.layout.simple_spinner_dropdown_item,activityList
));
spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()
{
@Override
public void onItemSelected(AdapterView<?> adapterView,View view,int i,long l)
{
Log.i("MyTag","Item selected at position " + i);
if (i==0) // check position of selected item and open activity
{
// do nothing
}
else if (i==1)
{
openActivity(NewActivity.class);
}
else
{
openActivity(NewActivitySecond.class);
}
}
@Override
public void onNothingSelected(AdapterView<?> adapterView)
{
}
});
}
private void openActivity(Class x) //funtion which opens activity
{
Intent intent = new Intent(this,x);
startActivity(intent);
}
}
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