如何將一個活動中的參數傳遞給另一個活動？

我根據從一個活動的點擊傳遞參數在列表視圖到另一個胡亞蓉其示值誤差在日誌貓傳遞參數線冷杉activity.java如何將一個活動中的參數傳遞給另一個活動？

public class SouthIndianvegrecipes1 extends Activity { 
    @Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.main); 

      ArrayList<Recipedetails> image_details = GetSearchResults(); 

      final ListView lv1 = (ListView) findViewById(R.id.listV_main); 
      lv1.setAdapter(new ItemListBaseAdapter(this, image_details)); 

      lv1.setOnItemClickListener(new OnItemClickListener() { 
       @Override 
       public void onItemClick(AdapterView<?> a, View v, int position, long id) { 
        Object o = lv1.getItemAtPosition(position); 
        Recipedetails obj_itemDetails = (Recipedetails)o; 
        Toast.makeText(SouthIndianvegrecipes1.this, "You have chosen : " + " " + obj_itemDetails.getName(), Toast.LENGTH_LONG).show(); 
        Intent newActivity = new Intent(SouthIndianvegrecipes1.this, 
           SouthIndianvegmanualrecipes.class); 



        newActivity.putExtra("name", obj_itemDetails.getName()); 
           startActivity(newActivity); 


       } 
      }); 
     } 

     private ArrayList<Recipedetails> GetSearchResults(){ 
      ArrayList<Recipedetails> results = new ArrayList<Recipedetails>(); 

      Recipedetails item_details = new Recipedetails(); 
      item_details.setName("Godhumai veg adai"); 
      item_details.setItemDescription("This is very good for dibets people"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(12); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Soyamore koozh"); 
      item_details.setItemDescription("Tasty to have this as main dish"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(13); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Tomato kulambu"); 
      item_details.setItemDescription("Good side dish for rice and dinner"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(14); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Tomato upma"); 
      item_details.setItemDescription("Evening time dinner for kids"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(15); 
      results.add(item_details); 




      item_details = new Recipedetails(); 
      item_details.setName("Navratri special vada"); 
      item_details.setItemDescription("Good snacks at the function"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(16); 

      results.add(item_details); 


      item_details = new Recipedetails(); 
      item_details.setName("Egg kurma"); 
      item_details.setItemDescription("Wonderful dish made by egg"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(17); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Milagu kuzhambu"); 
      item_details.setItemDescription("Good for digestion purpose"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(18); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Rasam"); 
      item_details.setItemDescription("Last and famous dish in lunch,good for health also"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(19); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Vegetable kootu"); 
      item_details.setItemDescription("Nice and healthy one"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(20); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("Avial"); 
      item_details.setItemDescription("Easy to prepare and lots of vegetable"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(21); 
      results.add(item_details); 

      item_details = new Recipedetails(); 
      item_details.setName("kothavarangaicurry"); 
      item_details.setItemDescription("Tamilnadu special and healthy too"); 
      //item_details.setUrlWiki("https://www.youtube.com/watch?v=C_r0mFvMSfU"); 
      item_details.setImageNumber(22); 
      results.add(item_details); 


      return results; 
     } 

} 
passing the arguments after toasting ,passing their names 
second activity.java 



    public class SouthIndianvegmanualrecipes extends Activity { 



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

      String value =null; 
      Bundle extras = getIntent().getExtras(); 
{ 
     if (extras != null) { 
     if (extras.containsKey("name")) { 
      value = extras.getString("name"); 
     } 
     } 



     { 
     //int obj_itemDetails.getImageNumber() = extras.getIntArray("numbers"); 

      //private ArrayList<Recipedetails2> GetSearchResults(){ 
       //ArrayList<Recipedetails2> results = new ArrayList<Recipedetails2>(); 

      if(value.equals("Godhumai veg adai")) 
      { 
       Recipedetails2 item_details = new Recipedetails2(); 
       item_details.setName("Godhumai veg adai"); 
       item_details.setIngredients("This is very good for dibets people"); 
       item_details.setMethods("This is very good for dibets people"); 

      } 
      else if(value.equals("Soyamore koozh")) 
      { 
       Recipedetails2 item_detail1 = new Recipedetails2(); 
       item_detail1.setName("Soyamore koozh"); 
       item_detail1.setIngredients("Tasty to have this as main dish"); 
       item_detail1.setMethods("This is very good for dibets people"); 
      } 
      else if(value.equals("Tomato kulambu")) 
      { 
       Recipedetails2 item_detail3 = new Recipedetails2(); 
       item_detail3.setName("Tomato kulambu"); 
       item_detail3.setIngredients("Good side dish for rice and dinner"); 
       item_detail3.setMethods("This is very good for dibets people"); 

      } 
      else if(value.equals("Navratri special vada")) 
      { 
       Recipedetails2 item_detail5 = new Recipedetails2(); 
       item_detail5.setName("Navratri special vada"); 
       item_detail5.setIngredients("Good snacks at the function"); 
       item_detail5.setMethods("This is very good for dibets people"); 

      } 
      else if(value.equals("Egg kurma")) 
      { 
       Recipedetails2 item_detail6 = new Recipedetails2(); 
       item_detail6.setName("Egg kurma"); 
       item_detail6.setIngredients("Wonderful dish made by egg"); 
       item_detail6.setMethods("This is very good for dibets people"); 

      } 
      else if(value.equals("Milagu kuzhambu")) 
      { 
       Recipedetails2 item_detail7 = new Recipedetails2(); 
       item_detail7.setName("Milagu kuzhambu"); 
       item_detail7.setIngredients("Good for digestion purpose"); 
       item_detail7.setMethods("This is very good for dibets people"); 

      } 

      else if(value.equals("Rasam")) 
      { 
       Recipedetails2 item_detail8 = new Recipedetails2(); 
       item_detail8.setName("Rasam"); 
       item_detail8.setIngredients("Last and famous dish in lunch,good for health also"); 
       item_detail8.setMethods("This is very good for dibets people"); 

      } 

      else if(value.equals("Vegetable kootu")) 
      { 
       Recipedetails2 item_detail9 = new Recipedetails2(); 
       item_detail9.setName("Vegetable kootu"); 
       item_detail9.setIngredients("Nice and healthy one"); 
       item_detail9.setMethods("This is very good for dibets people"); 

      } 

      else if(value.equals("Avial")) 
      { 
       Recipedetails2 item_detail10 = new Recipedetails2(); 
       item_detail10.setName("Avial"); 
       item_detail10.setIngredients("Easy to prepare and lots of vegetable"); 
       item_detail10.setMethods("This is very good for dibets people"); 

      } 

      else 
      { 
       Recipedetails2 item_detail11 = new Recipedetails2(); 
       item_detail11.setName("kothavarangaicurry"); 
       item_detail11.setIngredients("Tamilnadu special and healthy too"); 
       item_detail11.setMethods("This is very good for dibets people"); 

      } 


      } 
    }

其示值誤差在這一行字符串值= getIntent（）getStringExtra（「名稱」）。我的日誌貓錯誤是

03-08 04:52:09.754: E/AndroidRuntime(1048): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.example.recipestutors/com.example.recipestutors.SouthIndianvegmanualrecipes}: java.lang.NullPointerException 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2106) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread.access$600(ActivityThread.java:141) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.os.Handler.dispatchMessage(Handler.java:99) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.os.Looper.loop(Looper.java:137) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread.main(ActivityThread.java:5039) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at java.lang.reflect.Method.invokeNative(Native Method) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at java.lang.reflect.Method.invoke(Method.java:511) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at dalvik.system.NativeStart.main(Native Method) 
    03-08 04:52:09.754: E/AndroidRuntime(1048): Caused by: java.lang.NullPointerException 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at com.example.recipestutors.SouthIndianvegmanualrecipes.<init>(SouthIndianvegmanualrecipes.java:79) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at java.lang.Class.newInstanceImpl(Native Method) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at java.lang.Class.newInstance(Class.java:1319) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.Instrumentation.newActivity(Instrumentation.java:1054) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2097) 
    03-08 04:52:09.754: E/AndroidRuntime(1048):  ... 11 more

來源

2013-03-08 kkarthickk

請刪除不必要的代碼部分並告訴我們NullPointer異常發生在哪裏。 – smk 2013-03-08 05:11:15

哪裏是第79行SouthIndianvegmanualrecipes活動 – 2013-03-08 05:21:55

看看我的帖子，它可以幫助你 – 2013-03-08 05:29:30

請而不是直接調用的意圖嘗試做以下操作來檢查，如果一切是正確試圖讓您正在尋找

String value =null; 

Bundle extras = getIntent().getExtras(); 
     if (extras != null) { 
     if (extras.containsKey("name")) { 
      value = extras.getString("name"); 
     } 
     }

嘗試前值在目標類中定義公共靜態字符串（SouthIndianvegmanualrecipes）。例如： - public static String PRODUCT_NAME = "PRODUCT NAME PLACEHOLDER";

然後在頭等艙做

newActivity.putExtra(SouthIndianvegmanualrecipes.PRODUCT_NAME, obj_itemDetails.getName());

而在你的目標類

Bundle extras = getIntent().getExtras(); 
      if (extras != null) { 
      if (extras.containsKey(PRODUCT_NAME)) { 
       value = extras.getString(PRODUCT_NAME); 
      } 
      }

來源

2013-03-08 05:28:24

再次顯示錯誤在日誌貓捆綁extras = getIntent（）。getExtras（）;在這一行 – kkarthickk 2013-03-08 05:40:29

@ user2118898我在代碼中看不到任何錯誤。嘗試清理你的projet和/其他重新啓動你的IDE – 2013-03-08 05:57:44

你做了什麼，你告訴相同的錯誤顯示在logcat在同一行Bundle extras = getIntent（）。getExtras（）; – kkarthickk 2013-03-08 06:16:16

我猜private Object getIntent;是罪魁禍首。嘗試從下面的代碼中刪除它。

public class SouthIndianvegmanualrecipes extends Activity { 

private Object getIntent; 

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



String value =getIntent().getStringExtra("name");

來源

2013-03-08 06:01:31

雅我改變了我的代碼，但現在它也在這個線logcat中shwoing錯誤Bundle extras = getIntent（）。getExtras（）; logcat錯誤是03-08 06：05：08.194：E/AndroidRuntime（832）：\t at com.example.recipestutors.SouthIndianvegmanualrecipes。（SouthIndianvegmanualrecipes.java:18） – kkarthickk 2013-03-08 06:10:34

在我們必須把這樣它會在第二個活動

工作

@Override 
     public void onCreate(Bundle savedInstanceState) { 
      super.onCreate(savedInstanceState); 
      setContentView(R.layout.recipe_manual); 
      Intent intent = getIntent(); 
      String value = intent.getStringExtra("name");

來源

2013-03-08 08:04:04 kkarthickk

看到這個鏈接的回答http://stackoverflow.com/questions/15289809/how-to-pass-the-string-and-get-their-data-after-clicking-the-item-in-an-listview這個工作對我來說是正確的代碼

來源

2013-03-08 11:51:38 kkarthickk

如何將一個活動中的參數傳遞給另一個活動？

回答

相關問題