如何從一個主頁面打開多個XML表單

Question

我是初學者到android plz幫助我擁有一個主頁，並且我想在每個按鈕上打開一個表單....但它只打開一個頁面其餘頁面給出錯誤..... 這裏是主頁

<?xml version="1.0" encoding="utf-8"?> 

    <SlidingDrawer xmlns:android="http://schemas.android.com/apk/res/android" 
     android:background="@drawable/stars" 
     android:id="@+id/slidingDrawer1" 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:content="@+id/content" 
     android:handle="@+id/handle" > 
     <ImageView 
      android:id="@+id/handle" 
      android:layout_width="70dp" 
      android:layout_height="70dp" 
      android:src="@drawable/arrowup" /> 
     <LinearLayout 
      android:id="@+id/content" 
      android:layout_width="match_parent" 
      android:layout_height="332dp" 
      android:orientation="vertical" > 
      <Button 
       android:id="@+id/btnlenght" 
       android:layout_width="192dp" 
       android:layout_height="36dp" 
       android:layout_marginLeft="66dp" 
       android:layout_marginTop="22dp" 
       android:background="#3366cc" 
       android:textColor="#ffffff" 
       android:text="@string/btnlenght" /> 

      <Button 
       android:id="@+id/btnweight" 
       android:layout_width="192dp" 
       android:layout_height="36dp" 
       android:layout_marginLeft="66dp" 
       android:layout_marginTop="22dp" 
       android:layout_weight="0.00" 
       android:textColor="#ffffff" 
       android:background="#3366cc" 
       android:text="@string/btnweight" /> 


      <Button 
       android:id="@+id/btnarea" 
       android:layout_width="197dp" 
       android:layout_height="36dp" 
       android:layout_marginLeft="66dp" 
       android:layout_marginTop="22dp" 
       android:background="#3366cc" 
       android:textColor="#ffffff" 
       android:text="@string/btnarea" /> 

     <Button 
     android:id="@+id/btntemperature" 
     android:layout_width="197dp" 
     android:layout_height="36dp" 
     android:layout_marginLeft="66dp" 
     android:layout_marginTop="22dp" 
     android:textColor="#ffffff" 
     android:background="#3366cc" 
     android:text="@string/btntemperature" /> 
     <ImageView 
     android:id="@+id/back" 
     android:layout_width="74dp" 
     android:layout_height="88dp" 
     android:layout_marginLeft="0dp" 
     android:layout_marginTop="0dp" 
     android:layout_weight="0.24" 
     android:src="@drawable/back" /> 


     </LinearLayout> 

    </SlidingDrawer> 

我的XML代碼和編碼在這裏主頁面...............

public class firstpage extends Activity { 
/** Called when the activity is first created. */ 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.firstpage); 

    Button btnlenght=(Button)findViewById(R.id.btnlenght); 
    Button btnweight=(Button)findViewById(R.id.btnweight); 
    Button btnarea=(Button)findViewById(R.id.btnarea); 
    Button btntemperature=(Button)findViewById(R.id.btntemperature); 
    final ImageView handle=(ImageView)findViewById(R.id.handle); 
    ImageView back=(ImageView)findViewById(R.id.back); 
    SlidingDrawer slidingDrawer1=(SlidingDrawer)findViewById(R.id.slidingDrawer1); 
    slidingDrawer1.setOnDrawerOpenListener(new OnDrawerOpenListener() { 


     @Override 
     public void onDrawerOpened() { 
      // TODO Auto-generated method stub 
      handle.setImageResource(R.drawable.downarrow1); 

     } 
    }); 
    slidingDrawer1.setOnDrawerCloseListener(new OnDrawerCloseListener() { 

     @Override 
     public void onDrawerClosed() { 
      // TODO Auto-generated method stub 
      handle.setImageResource(R.drawable.arrowup); 
     } 
    }); 
    btnlenght.setOnClickListener(new OnClickListener() { 

     @Override 
     public void onClick(View v) { 
      // TODO Auto-generated method stub 
     Intent n = new Intent(v.getContext(),lenght.class); 
      startActivity(n); 
     } 


    }); 
    btnweight.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
      Intent a = new Intent(v.getContext(),weight.class); 
       startActivity(a); 
      } 


     }); 
    btnarea.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
      Intent n = new Intent(v.getContext(),Area.class); 
       startActivity(n); 
      } 

     }); 
    btntemperature.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
      Intent n = new Intent(v.getContext(),temperature.class); 
       startActivity(n); 
      } 


     }); 
    back.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View v) { 
       // TODO Auto-generated method stub 
       Intent n = new Intent(v.getContext(),A2ZunitconverterActivity.class); 
       startActivity(n); 
       finish(); 
       System.exit(0); 


      } 
     }); 





    } 

}

Answer 1

聲明所有的行爲您在標籤內的清單文件調用爲

<activity android:name=".temperature"/> 
<activity android:name=".weight"/> 

，或者如果您使用不同的包這些類，那麼你必須用包以聲明

<activity android:name="com.org.xxx.temperature"> 
<activity android:name="com.org.xxx.weight"> 

檢查清單文件ivity ..它可能對你有幫助...