0

あるアクティビティから別のアクティビティへのクリックに応じて、リストビューで引数を渡します。引数行firsactivity.javaを渡すというログ猫のエラーが表示されます。

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");

            }


            }
    }

この行にエラーが表示されていますStringvalue= getIntent（）。getStringExtra（ "name"）; 私のログ猫のエラーは

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
4

3 に答える 3

0

このように配置する必要がある2番目のアクティビティでは、機能します

@Override
        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.recipe_manual);
            Intent intent = getIntent();
            String value = intent.getStringExtra("name");
于 2013-03-08T08:04:04.547 に答える
0

私private Object getIntent;は犯人だと思います。以下のコードから削除してみてください。

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");
于 2013-03-08T06:01:31.213 に答える
0

インテントを直接呼び出す代わりに、次の操作を実行して、探している値を取得する前にすべてが正しいかどうかを確認してください。

String value =null; 

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

ターゲット クラス (SouthIndianvegmanualrecipes) で public static String を定義してみてください。例えば： public static String PRODUCT_NAME = "PRODUCT NAME PLACEHOLDER";

それからあなたの最初のクラスで

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

そして、あなたのターゲットクラスで

 Bundle extras = getIntent().getExtras();
          if (extras != null) {
             if (extras.containsKey(PRODUCT_NAME)) {
                value = extras.getString(PRODUCT_NAME);
             }
          }
于 2013-03-08T05:28:24.847 に答える