单击Android后退按钮时清除变量
我有一个应用程序,我想能够点击一个按钮,a,并显示一组特定的信息。然后单击后退按钮,然后单击按钮B,显示一组不同的信息。我已经在Drinks.java文件中编写了一个测试文本视图,以便通过确认传递的内容开始这个过程。目前,我首先按下的任何按钮都会卡在变量中。例如,如果我按下按钮A,然后按下后退箭头和按钮B,按钮A仍然显示在文本视图中。我尝试在点击侦听器中清空字符串,以“清除它们”,但这不起作用。有没有办法清除变量中的内容并重新分配其他内容?还是我的问题在别处 java单击Android后退按钮时清除变量,android,string,textview,back-button,Android,String,Textview,Back Button,我有一个应用程序,我想能够点击一个按钮,a,并显示一组特定的信息。然后单击后退按钮,然后单击按钮B,显示一组不同的信息。我已经在Drinks.java文件中编写了一个测试文本视图,以便通过确认传递的内容开始这个过程。目前,我首先按下的任何按钮都会卡在变量中。例如,如果我按下按钮A,然后按下后退箭头和按钮B,按钮A仍然显示在文本视图中。我尝试在点击侦听器中清空字符串,以“清除它们”,但这不起作用。有没有办法清除变量中的内容并重新分配其他内容?还是我的问题在别处 java import androi
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);
}
});
}
}
饮料.java
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class Drinks extends Activity{
TextView drinkHolder;
public static String drinkType = Bar.setDrinkType;
String drinkTestHolder="";
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_drinks);
drinkTestHolder = drinkType;
drinkHolder = (TextView)findViewById(R.id.drinkTest);
//String barNameHolder = "@string/"+drinkType;
//int textInt1 = getResources().getIdentifier(barNameHolder, null, getPackageName());
drinkHolder.setText(drinkTestHolder);
}
}
请改用发送给启动活动的意向:
你能简单地说出你想做什么吗?因为您的描述有点混乱…我希望“setDrinkType”变量根据按下的按钮而改变。当前它被卡住了,因此用户按下一个按钮,然后单击“后退”按钮并按下另一个按钮,第一个字符串仍然存在。这是因为您的setDrinkType是一个静态变量为什么会有不同?