我有一个应用程序，我希望能够点击按钮A，并显示一组特定的信息。然后单击后退按钮并单击按钮B并显示一组不同的信息。我已经将测试TextView编码到Drinks.java文件中，以便通过确认传递的内容来开始该过程。目前我推送的任何按钮都会卡在变量中。因此，例如，如果我按下按钮A，然后按下后退箭头并按下按钮B，按钮A仍然显示在textView中。我尝试在点击监听器中使字符串为空，以“清除它们”，但这不起作用。有没有办法消除变量中的内容并重新分配其他内容？或者问题出在其他地方？
Bar.java
from django.db.models import Count
groups = GroupPlayer.objects.annotate(num_players=Count('player'))
groups[0].num_players
Drinks.java
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
public class Bar extends Activity{
String setBarTest = MainActivity.setBar;
String barNameHolder, picHolder, barContactHolder, barPhoneHolder;
int imageInt, textInt1,textInt2, textInt3;
TextView setBarName, setBarContact,setBarPhone;
ImageView barPic;
Button viewAll, beer, wine, mixedDrinks, other, getTaxi;
static String setDrinkType = "";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bar);
Button viewAll = (Button)findViewById(R.id.btnviewAll);
Button beer = (Button)findViewById(R.id.btnBeer);
Button wine = (Button)findViewById(R.id.btnWine);
Button mixedDrinks = (Button)findViewById(R.id.btnMixedDrinks);
Button other = (Button)findViewById(R.id.btnOther);
Button getTaxi = (Button)findViewById(R.id.btnTaxi);
barPic = (ImageView) findViewById(R.id.barPic);
String picHolder = "drawable/"+setBarTest;
int imageInt = getResources().getIdentifier(picHolder, null, getPackageName());
barPic.setImageResource(imageInt);
setBarName = (TextView)findViewById(R.id.barName);
String barNameHolder = "@string/"+setBarTest;
int textInt1 = getResources().getIdentifier(barNameHolder, null, getPackageName());
setBarName.setText(textInt1);
setBarContact = (TextView)findViewById(R.id.barContact);
String barContactHolder = "@string/"+setBarTest+"Contact";
int textInt2 = getResources().getIdentifier(barContactHolder, null, getPackageName());
setBarContact.setText(textInt2);
setBarPhone = (TextView)findViewById(R.id.barPhone);
String barPhoneHolder = "@string/"+setBarTest+"Phone";
int textInt3 = getResources().getIdentifier(barPhoneHolder, null, getPackageName());
setBarPhone.setText(textInt3);
viewAll.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = (new Intent(Bar.this, Drinks.class));
startActivity(i);
}
});
beer.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setDrinkType = "";
setDrinkType = "Beer";
Intent i = (new Intent(Bar.this, Drinks.class));
startActivity(i);
}
});
wine.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setDrinkType = "";
setDrinkType = "Wine";
Intent i = (new Intent(Bar.this, Drinks.class));
startActivity(i);
}
});
mixedDrinks.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setDrinkType = "";
setDrinkType = "Mixed Drink";
Intent i = (new Intent(Bar.this, Drinks.class));
startActivity(i);
}
});
other.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
setDrinkType = "";
setDrinkType = "Other";
Intent i = (new Intent(Bar.this, Drinks.class));
startActivity(i);
}
});
getTaxi.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Intent i = (new Intent(Bar.this, Taxi.class));
startActivity(i);
}
});
}
}