关于在Android中从内部类获取价值的问题

嗨我的代码中出现错误，我不知道为什么我的程序有2个微调框和1个textview。当我在两个微调器中选择一些东西时，它应该调用getlate inner class 中的方法，这会向textview返回一些值。这个getrate类在我的java应用上工作，但它不适用于android应用。关于在Android中从内部类获取价值的问题

这里是我的代码

public class BTS extends Activity { 
/** Called when the activity is first created. */ 
int i=0; 
int j=0; 
String[] li={"1","2","3"}; 
getrate gr; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.main); 


final Spinner combo = (Spinner)findViewById(R.id.widget30); 
final Spinner combo2 = (Spinner)findViewById(R.id.widget32); 
final TextView rate = (TextView) findViewById(R.id.widget31); 


    ArrayAdapter<String> a = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, li); 
    ArrayAdapter<String> b = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item, li); 
     combo.setAdapter(a); 
     combo2.setAdapter(b); 
     combo.setOnItemSelectedListener(new OnItemSelectedListener() { 

    @Override 
    public void onItemSelected(AdapterView<?> arg0, View arg1, 
    int arg2, long arg3) { 
    // TODO Auto-generated method stub 
    i = (int) combo.getSelectedItemId(); 
    if(i==0||j==0){rate.setText("กรุณาเลือกสถานีต้นทางและปลายทาง");} 
    else {rate.setText("ราคาค่าโดยสาร : "+gr.get(i, j)+" บาท");} 
    } 

    @Override 
    public void onNothingSelected(AdapterView<?> arg0) { 
    // TODO Auto-generated method stub 

    } 


    }); 


     combo2.setOnItemSelectedListener(new OnItemSelectedListener() { 

    @Override 
    public void onItemSelected(AdapterView<?> arg0, View arg1, 
    int arg2, long arg3) { 
    // TODO Auto-generated method stub 
    j = (int) combo2.getSelectedItemId(); 
    if(i==0||j==0){rate.setText("กรุณาเลือกสถานีต้นทางและปลายทาง");} 
    else {rate.setText("ราคาค่าโดยสาร : "+gr.get(i, j)+" บาท");} 
    } 

    @Override 



    public void onNothingSelected(AdapterView<?> arg0) { 
    // TODO Auto-generated method stub 

    } 
    }); 
    } 
} 




class getrate { 

private String[][] list; 
int c2=0; 
String[] ct={"1","2","3"}; 
getrate(){ 

} 

public String get(int i,int j){ 
    return ct[i]; 
} 

}

诗篇。 Sry基因，我的英语; d

来源

2010-03-19 mrmamon

我认为你必须先初始化，然后通过使用BTS.this.gr

提到它这将是：

public void onCreate(Bundle savedInstanceState) { 

this.gr=new getrate(); 
... 

// in your anonymous class 
else {rate.setText("ราคาค่าโดยสาร : "+BTS.this.gr.get(i, j)+" บาท");} 

}

来源

2010-03-19 13:01:20 Pentium10

关于在Android中从内部类获取价值的问题

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